CN115855524A

CN115855524A - Battery cooling performance diagnosis method, medium, and vehicle

Info

Publication number: CN115855524A
Application number: CN202211537078.8A
Authority: CN
Inventors: 魏英英; 葛张成; 金敬南
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-03-28

Abstract

The embodiment of the application is applicable to the technical field of vehicles, and provides a diagnosis method and medium for battery cooling performance and a vehicle, wherein the method comprises the following steps: when a vehicle meets an enabling condition of a battery cooling performance diagnosis, determining the highest temperature of a single battery in a battery pack of the vehicle, wherein the battery pack comprises a plurality of single batteries; timing by using a target timer according to the highest temperature, wherein the target timer is a first timer or a second timer; determining a variation of the maximum temperature within a target timing duration of the target timer; and diagnosing the cooling performance of the battery according to the change condition of the highest temperature. Through the method, the accuracy of the diagnosis of the cooling performance of the battery of the vehicle can be improved.

Description

Battery cooling performance diagnosis method, medium, and vehicle

Technical Field

The application belongs to the technical field of vehicles, and particularly relates to a method and medium for diagnosing cooling performance of a battery and a vehicle.

Background

The power battery is a power source of the new energy electric vehicle, and the temperature characteristic of the power battery directly influences the performance, the service life and the durability of the pure electric vehicle. During the operation of the vehicle, the battery is charged and discharged, and the charging and discharging of the battery is accompanied by the generation of a large amount of heat. If the battery cannot be timely cooled, the internal temperature of the battery can sharply rise, so that the inconsistency between the internal resistance and the capacity of the battery is aggravated, and even thermal runaway is caused, so that potential safety hazards can be caused. Based on this, generally need to cool the battery, ensure that the battery can work in normal temperature range.

In order to ensure that the battery can operate in a normal temperature range, it is necessary to ensure that the vehicle has battery cooling performance. In order to ensure that the cooling performance of the battery of the vehicle reaches the standard, the cooling performance of the battery needs to be detected, but at present, when the performance of the battery is detected, a misdiagnosis phenomenon often exists, so that the vehicle is frequently misreported as a battery cooling performance fault, and the normal operation of the vehicle is not facilitated.

Disclosure of Invention

In view of the above, embodiments of the present application provide a method, an apparatus, a medium, and a vehicle for diagnosing battery cooling performance, so as to improve the accuracy of the diagnosis of the battery cooling performance of the vehicle.

A first aspect of an embodiment of the present application provides a method for diagnosing cooling performance of a battery, including:

when a vehicle meets an enabling condition of a battery cooling performance diagnosis, determining the highest temperature of a single battery in a battery pack of the vehicle, wherein the battery pack comprises a plurality of single batteries;

timing by using a target timer according to the highest temperature, wherein the target timer is a first timer or a second timer;

determining a variation of the maximum temperature within a target timing duration of the target timer;

and diagnosing the cooling performance of the battery according to the change condition of the highest temperature.

A second aspect of an embodiment of the present application provides a diagnostic apparatus for battery cooling performance, including:

a maximum temperature determination module for determining a maximum temperature of a single cell in a battery pack of a vehicle when the vehicle satisfies an enable condition for a battery cooling performance diagnosis, the battery pack including a plurality of the single cells;

the timing module is used for timing by using a target timer according to the highest temperature, and the target timer is a first timer or a second timer;

the temperature change determining module is used for determining the change condition of the highest temperature within the target timing duration of the target timer;

and the cooling performance diagnosis module is used for diagnosing the cooling performance of the battery according to the change condition of the highest temperature.

A third aspect of embodiments of the present application provides a cooling performance diagnosis apparatus, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the method according to the first aspect when executing the computer program.

A fourth aspect of embodiments of the present application provides a computer-readable storage medium, in which a computer program is stored, which, when executed by a processor, implements the method according to the first aspect as described above.

A fifth aspect of embodiments of the present application provides a computer program product, which, when run on a cooling performance diagnostic apparatus, causes the cooling performance diagnostic apparatus to perform the method of the first aspect.

A sixth aspect of the present embodiment provides a vehicle including a battery, the vehicle performing the method of the first aspect described above to enable diagnosis of cooling performance of the battery.

Compared with the prior art, the embodiment of the application has the following advantages:

in the embodiment of the application, when the cooling performance of the vehicle battery is diagnosed, whether the vehicle meets the enabling condition of the battery cooling performance diagnosis can be determined firstly. The diagnosis of the battery cooling performance is performed only when the vehicle satisfies the enabling condition of the battery cooling performance diagnosis, and the misjudgment of the battery cooling performance due to other factors can be avoided. In performing the diagnosis of the battery cooling performance, the maximum temperature of the unit battery in the battery pack of the vehicle may be determined, and the target timer may be used to perform timing based on the maximum temperature to determine the variation of the maximum temperature within the target timing period. Since the cooling performance of the battery may reflect the ability to cool down the battery, it may be determined whether the vehicle has achieved cooling down of the battery based on the maximum temperature of the battery cells. The cooling performance is diagnosed based on the change condition of the highest temperature within the target timing duration instead of diagnosing the cooling performance based on the highest temperature at a certain moment, so that misjudgment on the cooling performance caused by abnormal temperature at a certain moment can be avoided, and the accuracy of diagnosis on the cooling performance of the battery is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below.

Fig. 1 is a schematic flowchart illustrating steps of a method for diagnosing cooling performance of a battery according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a vehicle battery provided in an embodiment of the present application;

FIG. 3 is a schematic flow chart diagram illustrating another method for diagnosing cooling performance of a battery according to an embodiment of the present application;

FIG. 4 is a schematic diagram illustrating another exemplary battery cooling performance diagnostic provided by an embodiment of the present application;

fig. 5 is a schematic diagram of a device for diagnosing cooling performance of a battery according to an embodiment of the present application;

fig. 6 is a schematic diagram of a cooling performance diagnosis apparatus according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

The hybrid electric vehicle or the electric vehicle uses batteries which are not one or two batteries and are formed by combining hundreds or thousands of single batteries according to different serial and parallel connection modes. At present, most of batteries adopt lithium ion batteries, but the lithium ion batteries have extremely high requirements on working temperature, safety protection and the like, for example, the optimum working temperature is 10-30 ℃, and overhigh or overlow temperature has influence on the service life and performance of the batteries. Therefore, the battery must be cooled to ensure that it operates within a normal temperature range and to ensure that the individual cells are at substantially the same operating temperature. The method has the advantages that the battery cooling performance can be diagnosed, whether the battery cooling performance of the vehicle reaches the standard can be judged, and therefore corresponding measures can be taken timely when the battery cooling performance of the vehicle does not reach the standard, the battery of the vehicle can be guaranteed to work at a proper temperature, the performance of the battery is guaranteed, and the service life of the battery is prolonged. Based on this, the present application proposes a method of diagnosing the cooling performance of a battery.

The technical solution of the present application will be described below by way of specific examples.

Referring to fig. 1, a schematic flow chart illustrating steps of a method for diagnosing a cooling performance of a battery according to an embodiment of the present application is shown, which may specifically include the following steps:

s101, when the vehicle meets the enabling condition of the battery cooling performance diagnosis, determining the highest temperature of a single battery in a battery pack of the vehicle, wherein the battery pack comprises a plurality of single batteries.

The method in the present embodiment may be applied to a vehicle for diagnosing the cooling performance of a vehicle battery. The method is suitable for the thermal management structure for cooling the battery in a liquid cooling mode, and comprises the steps of not being limited to pure electric vehicles and hybrid electric vehicles. The cooling performance may be the ability to cool down the battery during vehicle operation. If the cooling performance of the vehicle battery reaches the standard, the battery can be kept in a certain temperature range in the running process of the vehicle, so that the normal work of the power battery is ensured.

The batteries used by the hybrid electric vehicle or the electric vehicle are not one or two batteries, and are formed by combining hundreds or thousands of single batteries according to different serial connection and parallel connection modes. The battery pack is formed by a plurality of single batteries.

Fig. 2 is a schematic diagram of a battery provided in an embodiment of the present application, and as shown in fig. 2, the battery may include an upper cover 21 with a cooling pipe, a battery pack 22 composed of a plurality of single batteries, and a bottom case 23 with a cooling pipe. The cooling pipe may include a water inlet pipe through which a coolant having a relatively low temperature flows, and a water outlet pipe through which the coolant flows, thereby taking away heat generated from the unit cells in the battery pack, and finally flows out. The cooling pipe can be used for radiating the single batteries in the battery pack, so that each single battery in the battery pack can be at a basically normal working temperature.

Because the cooling performance refers to the capacity of cooling the battery, whether the battery is cooled and whether the capacity of cooling the battery reaches the standard can be determined by monitoring the temperature of each single battery in the battery pack in the running process of the vehicle.

Each single battery in the battery pack can acquire corresponding temperature through a temperature sensor or other devices inside the battery. At the same time, each single battery corresponds to one temperature, and the temperature of the single battery with the highest temperature is taken as the highest temperature. During the operation of the vehicle, the temperature of each cell in the battery pack can be monitored, and the maximum temperature of each cell in the battery pack at each moment can be determined.

And S102, timing by using a target timer according to the highest temperature, wherein the target timer is a first timer or a second timer.

Based on the cooling performance, the temperature of the battery may generally be maintained below or equal to the first temperature threshold, which may be 55 degrees celsius, for example.

However, in the operation process, under the condition that the cooling performance is normal, there may be some sporadic moments when the maximum temperature is higher than the first temperature threshold, so in order to improve the correctness of the diagnosis, the maximum temperature within a period of time may be used for the diagnosis, and therefore, in the embodiment, the target timer is used, and the target timer includes the first timer and the second timer. If the highest temperature is lower than or equal to the first temperature threshold, a first timer can be used for timing, and a second timer is reset, namely the timing duration of the first timer is the duration of the highest temperature which is lower than or equal to the first temperature threshold; and if the highest temperature is higher than the first temperature threshold, timing by using a second timer, and resetting the first timer, namely the timing duration of the second timer is the duration of the highest temperature higher than the first temperature threshold. When the highest temperature is lower than or equal to the first temperature threshold, resetting the second timer, namely, resetting the second timer to zero, so that the timing duration of the second timer can be ensured to be the duration that the highest temperature is higher than the first temperature threshold, and the timing duration has no interruption; when the highest temperature is higher than the first temperature threshold, the first timer is reset, that is, the first timer is reset to zero, so that the timing duration of the first timer can be ensured to be the duration that the highest temperature is lower than or equal to the first temperature threshold, and no interruption exists in the middle of the timing duration.

S103, determining the change condition of the highest temperature in the target timing duration of the target timer.

The target timing duration may include a target timing duration of the first timer and a target timing duration of the second timer, and the target timing duration of the first timer and the target timing duration of the second timer may be equal or unequal. For example, the target timing length of the first timer and the target timing length of the second timer may be 60s; alternatively, the target timing length of the first timer may be 60s, and the target timing length of the second timer may be 50s.

The above variations may include the maximum temperature being less than or equal to the first temperature threshold for the target timed interval and the maximum temperature being greater than the first temperature threshold for the target timed interval.

Based on the change in the maximum temperature within the target time period, it is possible to determine whether the vehicle can keep the battery at a certain temperature, so that the diagnosis of the cooling performance can be made.

And S104, diagnosing the cooling performance of the battery according to the change condition of the highest temperature.

If the highest temperature is lower than or equal to the first temperature threshold within the target timing duration of the first timer, the battery temperature of the vehicle can be maintained at a certain temperature, and the cooling performance of the battery is determined to be fault-free; if the highest temperature is higher than the first temperature threshold within the target timing duration of the second timer, it indicates that the vehicle cannot maintain the temperature of the battery at a certain temperature, and it is determined that the cooling performance of the battery is failed.

A fault flag for battery cooling performance may be included in the vehicle, and the fault flag may include a first flag value and a second flag value. When the cooling performance of the battery is not faulty, the fault flag may be set to a first flag value; when the cooling performance of the battery fails, the failure flag bit may be set to the second flag value. Illustratively, the first flag value may be 0 and the second flag value may be 1.

In order to ensure the accuracy of the cooling performance diagnosis of the battery, the cooling performance diagnosis of the battery may be performed after the influence of other factors is eliminated. That is, the diagnosis of the battery cooling performance is performed after the vehicle satisfies the enabling condition of the battery cooling performance diagnosis.

When the vehicle is powered off, the heat of the battery cannot be dissipated in a short time after the vehicle runs for a long time. If the vehicle is restarted soon after power-off, the battery heat generated by the last operation cannot be dissipated, in which case the diagnosis of the cooling performance of the battery cannot be made accurately naturally. Based on this, the temperature enable condition is set in the embodiment of the present application. The temperature enabling condition comprises that the highest power-on temperature of a single battery in the battery pack is lower than or equal to a preset second temperature threshold when the vehicle is powered on, and the temperature of the cooling liquid in the water inlet pipeline of the battery is lower than or equal to a preset third temperature threshold when the vehicle is powered on. That is, when the vehicle is powered on, the highest temperature of a single battery in the battery pack and the temperature of the coolant in the pipe at the water inlet of the battery can be detected, and if the highest power-on temperature is lower than or equal to a preset second temperature threshold and the temperature of the coolant in the pipe at the water inlet of the battery is lower than or equal to a preset third temperature threshold when the vehicle is powered on, it is indicated that the vehicle meets the temperature enabling condition; if the highest power-on temperature is higher than a preset second temperature threshold, or the temperature of the cooling liquid in the water inlet pipeline of the battery is higher than a preset third temperature threshold when the vehicle is powered on, it indicates that the vehicle does not meet the temperature enabling condition, and the diagnosis of the cooling performance of the battery is not carried out in the current driving cycle. Generally, the second temperature threshold and the third temperature threshold are lower than the first temperature threshold, for example, the second temperature threshold may be 30 degrees celsius and the third temperature threshold may be 50 degrees celsius.

Furthermore, if the cooling system is faulty or the cooling pump is not operating, the battery cannot be cooled without necessity, and the battery cooling performance diagnosis at this time is meaningless, and based on this, the enable condition in the present embodiment also includes a status enable condition. The state-enabled condition may include that a cooling system of the vehicle is not malfunctioning and a cooling pump of the vehicle is in an active state. That is, before the diagnosis of the cooling performance is performed, it is necessary to detect the state of the cooling system and the state of the cooling pump. Specifically, the state of the cooling system may include states of various devices in the cooling system, such as valves, temperature sensors, and cooling devices, and if each device in the cooling system is clear, the cooling system is not faulty. Each device in the cooling system may have a corresponding status flag, and by reading the status flag, it may be determined whether the corresponding device has a fault. The cooling pump can also be provided with a corresponding state identification position, the state identification position can comprise two state values, and when the state identification position is a first state value, the cooling pump can be determined to be in a working state, namely the cooling pump normally runs, so that low-temperature liquid can be pumped into the cooling pipe to cool the battery; when the status flag is the second status value, it can be determined that the cooling pump is not currently operating, and battery cooling is not possible at this time.

In addition, in the determination of the battery cooling performance, it is first determined that the operating state of the battery pack is normal. The operating state of the battery pack may be characterized using an operating current of the battery pack, based on which the enabling condition in the present embodiment further includes a current enabling condition. The current enable condition includes an operating current of the battery pack being less than a preset current threshold. The working current of the battery pack can be measured by the arranged current sensor, when the battery of the battery pack is greater than or equal to the current threshold, the working state of the battery pack is abnormal, the generated heat is also abnormal, and then the diagnosis result of the cooling performance has errors; when the current in the battery pack is smaller than the current threshold value, the battery pack works normally, and the vehicle meets the current enabling condition of the cooling performance diagnosis.

And when the vehicle meets the temperature enabling condition, the state enabling condition and/or the current enabling condition, judging that the vehicle meets the enabling condition of the battery cooling performance diagnosis.

In a possible implementation, the enabling condition may further include a motor state enabling condition. When the motor of the vehicle is in an abnormal state, the heat generated by the motor is unstable, and if the battery cooling performance is diagnosed, the diagnosis result is inaccurate due to the abnormal heat generated by the motor. For example, when the amount of heat generated during the operation of the motor is excessive, the task pressure for cooling the battery is high, and the cooling performance obtained by diagnosis may be inaccurate. Therefore, in the working process of the motor, whether the heat generated by the motor is normal can be detected; if the heat generated by the motor is normal, determining that the vehicle meets the motor state enabling condition; and if the heat generated by the motor is abnormal, determining that the vehicle does not meet the motor state enabling condition. When the temperature generated by the motor is too high, the temperature of the cooling liquid is increased, and therefore, after the cooling liquid passes through the battery, the temperature of the cooling liquid in the water outlet pipeline is too high. When carrying out battery cooling performance and judging, need judge under the stable prerequisite of motor temperature, consequently, can be based on whether the temperature of battery outlet pipeline cooling liquid temperature detection motor is stable. The battery can determine the temperature of the cooling liquid of the battery water outlet pipeline based on the temperature sensor, and if the temperature of the cooling liquid of the battery water outlet pipeline is higher than a fourth temperature threshold value, a preset third timer is used for timing; and if the temperatures of the cooling liquids of the water outlet pipelines of the battery are all higher than the fourth temperature threshold value within the target timing duration of the third timer, determining that the heat generated by the motor is abnormal. Typically, the fourth temperature threshold is higher than the first temperature threshold. Illustratively, the fourth temperature threshold may be 60 degrees celsius. The vehicle can perform the diagnosis of the battery cooling performance only when the temperature enable condition, the state enable condition, the current enable condition, and the motor state enable condition are satisfied. In the present embodiment, the vehicle generally performs the diagnosis of the battery cooling performance only once in one driving cycle. In the process of diagnosing the cooling performance of the battery, data needs to be collected and judgment data is obtained based on the collected data, for example, the collected data may include the temperature of a single battery, the temperature of a cooling fluid in a pipe at a water inlet of the battery, the state of a cooling system, the state of a cooling pump, the current of a battery pack, and the like, the judgment data obtained based on the collected data may include a fault flag value, whether enabling conditions are met, and the like, the collected data and the judgment data may be diagnostic data, and when next diagnosis of the cooling performance of the battery is performed, data and the judgment data generally need to be collected again, so that a clearing instruction for the diagnostic data can be received when the vehicle is powered off or powered on, so that the diagnostic data is initialized, and the next diagnosis of the cooling performance of the battery is performed conveniently. When there is a purge command in the vehicle, data for performing a diagnosis of the battery cooling performance in the vehicle is initialized, and at this time, it is apparent that the diagnosis of the vehicle diagnostic performance cannot be performed, and therefore, the diagnostic process may be terminated.

In another possible implementation, the temperature variation of the battery is also affected by the ambient temperature. When the ambient temperature is too high, the battery is difficult to cool; when the ambient temperature is too low, the battery is relatively easily cooled. Therefore, the ambient temperature can be detected, and the battery cooling performance can be diagnosed only when the ambient temperature is higher than the fifth temperature threshold and lower than or equal to the sixth temperature threshold, so that the influence of the ambient temperature on the battery cooling performance diagnosis is avoided. Illustratively, the fifth temperature threshold may be 4 degrees celsius and the sixth temperature threshold may be 35 degrees celsius.

In this embodiment, when diagnosing the battery cooling performance of the vehicle, it may be determined whether the enabling condition for the battery cooling performance is satisfied based on the ambient temperature, the temperature of the cooling fluid in the pipe at the water inlet of the battery, the cooling system, the cooling pump, the current of the battery pack, and other information, so as to eliminate the influence of other factors on the battery cooling performance, and make the diagnosis of the battery cooling performance accurate and reliable.

It should be noted that, the sequence numbers of the steps in the foregoing embodiments do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Referring to fig. 3, which is a schematic flowchart illustrating another method for diagnosing battery cooling performance according to an embodiment of the present disclosure, as shown in fig. 3, when a vehicle is powered on, a battery inlet pipe coolant temperature and a maximum battery cell temperature may be detected, and if the battery inlet pipe coolant temperature is lower than or equal to a second temperature threshold value when the vehicle is powered on, and the maximum battery cell temperature is lower than or equal to a third temperature threshold value when the vehicle is powered on, it may be determined whether a purge command is present in the vehicle; if no clear command exists in the vehicle, whether the vehicle is high-voltage or not can be determined, so that whether the vehicle runs or not can be determined; if the vehicle is at a high voltage, the vehicle is running, namely the power battery can generate heat, and whether the cooling system is in failure or not can be determined; if the vehicle has no related faults of the cooling water pump, no related faults of the battery temperature sensor and no related faults of the air conditioning component, the cooling system can be indicated to have no faults, and at the moment, if the ambient temperature is higher than a fifth temperature threshold value and is lower than or equal to a sixth temperature threshold value, whether the cooling water pump runs or not can be determined; if the cold water pump is in the running state, whether the temperature of the cooling liquid of the battery water outlet pipeline is higher than a fourth temperature threshold value or not can be detected; if the temperature of the cooling liquid in the water inlet pipeline of the battery is not higher than the fourth temperature threshold, whether the working current of the battery is smaller than a preset current threshold or not can be detected; if the working current of the battery is smaller than the preset current threshold, it can be indicated that the vehicle meets the enabling condition of the battery cooling performance diagnosis, and the battery cooling performance diagnosis can be performed at this time. When the battery cooling performance diagnosis is carried out, if the highest temperature of the single battery is lower than or equal to the first temperature threshold, the first timer can be increased and the second timer can be reset; if the highest temperature of the single battery is higher than the first temperature threshold, the second timer can be increased and the first timer can be reset; if the timing duration of the first timer is greater than the first time threshold, the diagnosis is passed, the battery cooling performance diagnosis result is no fault, and the fault flag position can be set to be 0; if the timing duration of the second timer is greater than the second time threshold, the fault is diagnosed, the battery cooling performance diagnosis result is the fault, and the fault flag position can be set to 1; after the fault flag is determined, the fault flag result may be reported to a vehicle controller of the vehicle, and the diagnosis of the battery cooling performance may be ended.

As shown in fig. 3, in the battery cooling performance diagnosis process, if the temperature of the battery water inlet pipeline cooling liquid is higher than the second temperature threshold value when the battery is powered on, or the highest temperature of the battery cell is higher than the third temperature threshold value when the battery is powered on; or a purge command is present in the vehicle; or the vehicle is not subjected to high pressure; or a cooling system failure; or the cooling pump is not in operation; or the ambient temperature is lower than or equal to a fifth temperature threshold or the ambient temperature is higher than a sixth temperature threshold; or the time length of the temperature of the cooling liquid of the water outlet pipeline of the battery is higher than the fourth temperature threshold value and is larger than the third time threshold value, the diagnosis of the cooling performance of the battery can be stopped, so that the cooling performance diagnosis of the battery is not influenced by other factors, and the accuracy of the cooling performance diagnosis of the battery is improved.

Fig. 4 is a schematic diagram of a battery cooling performance diagnosis according to an embodiment of the present application, and as shown in fig. 4, it may be determined whether an enable condition of the battery cooling performance diagnosis is currently satisfied based on a battery cell temperature, a pipe coolant temperature, an ambient temperature, a vehicle temperature, and a related fault state, and then the battery cooling performance diagnosis may be performed based on a maximum temperature of the battery cell, and whether the maximum temperature of the battery cell is always lower than or equal to a first temperature threshold within a certain time period is used as a criterion for diagnosing a fault flag. In performing the battery cooling performance diagnosis, relevant parameters may also be used, which may include set temperature thresholds, time thresholds, and the like. After the diagnosis is completed, the fault zone bit can be assigned, the state information of the cooling performance of the vehicle can be determined based on the fault zone bit, and the fault zone bit and the state information are reported to the vehicle controller of the vehicle.

In the cooling performance diagnosis shown in fig. 4, the cooling performance diagnosis may be performed again on the premise that the base battery cell temperature, the pipe coolant temperature, the ambient temperature, the vehicle temperature, and the related fault state meet the enabling conditions, and the influence of the ambient temperature, the other equipment fault, and the vehicle state on the cooling performance of the battery may be eliminated, thereby ensuring the accuracy of the cooling performance diagnosis.

Referring to fig. 5, a schematic diagram of a diagnostic apparatus for battery cooling performance provided in an embodiment of the present application is shown, and specifically may include a maximum temperature determining module 51, a timing module 52, a temperature change determining module 53, and a cooling performance diagnostic module 54, where:

a maximum temperature determination module 51 for determining a maximum temperature of a single cell in a battery pack of a vehicle when the vehicle satisfies an enabling condition for a battery cooling performance diagnosis, the battery pack including a plurality of the single cells;

a timing module 52, configured to perform timing by using a target timer according to the maximum temperature, where the target timer is a first timer or a second timer;

a temperature change determining module 53, configured to determine a change of the highest temperature within a target timing duration of the target timer;

and a cooling performance diagnosis module 54 for diagnosing the cooling performance of the battery according to the variation of the maximum temperature.

In a possible implementation manner, the timing module 52 includes:

the first timing submodule is used for timing by using the first timer and resetting the second timer if the highest temperature is lower than or equal to a preset first temperature threshold;

and the second timing submodule is used for timing by using the second timer and resetting the first timer if the highest temperature is higher than the first temperature threshold.

In one possible implementation, the cooling performance diagnosis module 54 includes:

a first diagnostic submodule configured to determine that there is no fault in the cooling performance of the battery if the maximum temperatures are all lower than or equal to the first temperature threshold within a target timing duration of the first timer;

and the second diagnosis submodule is used for determining the cooling performance fault of the battery if the highest temperature is higher than the first temperature threshold value within the target timing duration of the second timer.

In one possible implementation, the enable conditions include a temperature enable condition, a state enable condition, and a current enable condition, wherein:

the temperature enabling condition comprises that the highest power-on temperature of a single battery in the battery pack is lower than or equal to a preset second temperature threshold when the vehicle is powered on, the temperature of battery water inlet pipeline cooling liquid is lower than or equal to a preset third temperature threshold when the vehicle is powered on, and the second temperature threshold and the third temperature threshold are lower than the first temperature threshold;

the state enabling condition comprises that a cooling system of the vehicle is not in fault and a cooling pump of the vehicle is in a working state;

the current enabling condition comprises that the working current of the battery pack is smaller than a preset current threshold;

the device further comprises an enabling condition judging module for judging that the vehicle meets the enabling condition of the battery cooling performance diagnosis when the vehicle meets the temperature enabling condition, the state enabling condition and the current enabling condition.

In one possible implementation, the enabling condition further includes a motor state enabling condition, and the apparatus further includes:

the heat detection module is used for detecting whether the heat generated by the motor is normal or not in the working process of the motor;

the first motor state judgment module is used for determining that the vehicle meets the motor state enabling condition if the heat generated by the motor is normal;

and the second motor state judgment module is used for determining that the vehicle does not meet the motor state enabling condition if the heat generated by the motor is abnormal.

In a possible implementation manner, the heat detecting module includes:

the battery water outlet pipeline cooling liquid temperature determining submodule is used for determining whether the temperature of the battery water outlet pipeline cooling liquid is higher than a preset fourth temperature threshold value, and the fourth temperature threshold value is higher than the first temperature threshold value;

the third timing submodule is used for timing by using a preset third timer if the temperature of the cooling liquid of the battery water outlet pipeline is higher than the fourth temperature threshold;

and the heat abnormity determining submodule is used for determining that the heat generated by the motor is abnormal if the temperature of the cooling liquid of the battery water outlet pipeline is higher than the fourth temperature threshold value within the target timing duration of the third timer.

In a possible implementation manner, the apparatus further includes:

a clear instruction determination module configured to determine whether a clear instruction for initializing diagnostic data is received, the diagnostic data being data acquired during a cooling performance diagnosis and judgment data obtained based on the acquired data;

and the termination diagnosis module is used for terminating the diagnosis of the cooling performance of the battery if the clearing instruction is received.

In a possible implementation manner, the apparatus further includes:

the environment temperature acquisition module is used for acquiring environment temperature;

a first ambient temperature judgment module, configured to execute the step of performing timing by using a target timer according to the highest temperature if the ambient temperature is higher than a fifth temperature threshold and lower than or equal to a sixth temperature threshold;

and the second ambient temperature judging module is used for terminating the diagnosis of the cooling performance of the battery if the ambient temperature is lower than or equal to the fifth temperature threshold or higher than the sixth temperature threshold.

For the apparatus embodiment, since it is substantially similar to the method embodiment, it is described relatively simply, and reference may be made to the description of the method embodiment section for relevant points.

Fig. 6 is a schematic structural diagram of a cooling performance diagnosis device according to an embodiment of the present application. As shown in fig. 6, the cooling performance diagnosis apparatus 6 of this embodiment includes: at least one processor 60 (only one shown in fig. 6), a memory 61, and a computer program 62 stored in the memory 61 and executable on the at least one processor 60, the processor 60 implementing the steps in any of the various method embodiments described above when executing the computer program 62.

The cooling performance diagnosis apparatus 6 may include, but is not limited to, a processor 60, and a memory 61. Those skilled in the art will appreciate that fig. 6 is merely an example of the cooling performance diagnosis apparatus 6, and does not constitute a limitation to the cooling performance diagnosis apparatus 6, and may include more or less components than those shown, or combine some components, or different components, for example, and may further include an input-output device, a network access device, and the like.

The Processor 60 may be a Central Processing Unit (CPU), and the Processor 60 may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 61 may be an internal storage unit of the cooling performance diagnosis apparatus 6 in some embodiments, for example, a hard disk or an internal memory of the cooling performance diagnosis apparatus 6. The memory 61 may also be an external storage device of the cooling performance diagnosis device 6 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the cooling performance diagnosis device 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the cooling performance diagnosis device 6. The memory 61 is used for storing an operating system, an application program, a BootLoader (BootLoader), data, and other programs, such as program codes of the computer programs. The memory 61 may also be used to temporarily store data that has been output or is to be output.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the foregoing method embodiments.

The present application provides a computer program product, which when running on a cooling performance diagnosis device, causes the cooling performance diagnosis device to implement the steps that can implement the above method embodiments.

The embodiment of the application also provides a vehicle, which comprises a battery, and the vehicle executes the steps of the method embodiments to realize the diagnosis of the cooling performance of the battery.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A method of diagnosing cooling performance of a battery, comprising:

2. The method of claim 1, wherein said counting using a target timer based on said maximum temperature comprises:

if the highest temperature is lower than or equal to a preset first temperature threshold, timing by using the first timer, and resetting the second timer;

if the maximum temperature is higher than the first temperature threshold, timing by using the second timer, and resetting the first timer.

3. The method of claim 2, wherein said diagnosing the cooling performance of the battery based on the change in the maximum temperature comprises:

if the maximum temperatures are all lower than or equal to the first temperature threshold within the target timing duration of the first timer, determining that the cooling performance of the battery is fault-free;

and if the maximum temperature is higher than the first temperature threshold within the target timing duration of the second timer, determining that the cooling performance of the battery is failed.

4. The method of any one of claims 1-3, wherein the enabling conditions include temperature enabling conditions, state enabling conditions, and/or current enabling conditions, wherein:

the state-enabled condition includes that a cooling system of the vehicle is not faulty and a cooling pump of the vehicle is in an active state;

determining that the vehicle satisfies an enabling condition for a battery cooling performance diagnosis when the vehicle satisfies the temperature enabling condition, the state enabling condition, and the current enabling condition.

5. The method of any of claims 1-3, wherein the enable condition further comprises a motor state enable condition, the method further comprising:

detecting whether the heat generated by the motor is normal or not in the working process of the motor;

if the heat generated by the motor is normal, determining that the vehicle meets the motor state enabling condition;

and if the heat generated by the motor is abnormal, determining that the vehicle does not meet the motor state enabling condition.

6. The method of claim 5, wherein detecting whether the heat generated by the motor is normal during operation of the motor comprises:

determining whether the temperature of the battery water outlet pipeline cooling liquid is higher than a preset fourth temperature threshold value, wherein the fourth temperature threshold value is higher than the first temperature threshold value;

if the temperature of the cooling liquid of the battery water outlet pipeline is higher than the fourth temperature threshold value, timing by using a preset third timer;

and if the temperature of the cooling liquid of the battery water outlet pipeline is higher than the fourth temperature threshold value within the target timing duration of the third timer, determining that the heat generated by the motor is abnormal.

7. The method of claim 4, wherein the method further comprises:

determining whether a clear instruction for initializing diagnostic data, which is data acquired in a process of performing cooling performance diagnosis and judgment data obtained based on the acquired data, is received;

if the purge command is received, the diagnosis of the battery cooling performance is terminated.

8. The method of claim 1, wherein prior to counting using a target timer based on the maximum temperature, the method further comprises:

acquiring an ambient temperature;

if the environment temperature is higher than a fifth temperature threshold and lower than or equal to a sixth temperature threshold, executing the step of timing by using a target timer according to the highest temperature;

if the ambient temperature is less than or equal to the fifth temperature threshold, or the ambient temperature is greater than the sixth temperature threshold, terminating the diagnosis of the battery cooling performance.

9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-8.

10. A vehicle comprising a battery, the vehicle implementing a method according to any one of claims 1-8 to enable diagnosis of cooling performance of the battery.