A method for detecting a battery system thermal management function of a trial production prototype vehicle

Abstract

The application discloses a kind of detection methods of battery system thermal management function of trial production sample car, belong to the technical field of automobile thermal management system, comprising: after the power supply of sample car, the temperature of the cell of power battery and environment temperature are collected;According to the highest cell temperature of power battery and environment temperature, it is judged whether to start battery system heating function detection condition;Real-time detection battery cell temperature and environment temperature, and whether heating function is normal according to real-time data is judged;If heating function is normal, whether to start cooling function detection condition is continued to be judged;Real-time detection battery cell temperature and environment temperature, and whether battery system cooling function is normal according to real-time data is judged;The method is under normal temperature condition, through new energy trial production sample car battery system thermal management function test logic, the opening of new energy sample car battery system thermal management function is realized, battery system sensor temperature parameter monitoring is realized, and the detection of new energy trial production sample car battery system thermal management function is conveniently and quickly realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile thermal management system, and particularly relates to a detection method for battery system thermal management function of a trial sample vehicle. BACKGROUND

[0002] The battery system thermal management function of a new energy trial sample vehicle influences the power release and safety of the battery system, and is a necessary function item of sample vehicle test work. The detection of the battery system thermal management function of the new energy trial sample vehicle needs the temperature parameters of the battery system to meet the thermal management working conditions. Since the trial assembly workshop is a normal temperature workshop, the temperature requirement of the battery system thermal management function cannot be met, so the detection work of the battery thermal management function of the new energy trial sample vehicle needs to use the environmental warehouse. However, the environmental warehouse resources are limited, and the temperature adjustment period of the environmental warehouse is long, which cannot meet the trial sample vehicle debugging rhythm requirement, so the environmental conditions required by the battery system thermal management function of the new energy trial sample vehicle are difficult to realize.

[0003] The battery thermal management system of the new energy trial sample vehicle is complex, and the thermal management function cannot be confirmed by a simple way of cooling fan working state or front cabin water pipe temperature change. The existing method is to place the sample vehicle on the lifting machine, disassemble the chassis guard plate, and then detect the temperature change of the battery water inlet pipe and water outlet pipe to confirm whether the thermal management function is realized. This method occupies the lifting machine resources, has a long detection period, and has the problems of operation difficulty and low efficiency.

[0004] Since the environmental temperature of the new energy trial sample vehicle is difficult to adjust as required, the confirmation method of the battery system thermal management function of the new energy trial sample vehicle is complex, so that the battery system thermal management function cannot be detected and debugged before the new energy trial sample vehicle is delivered for test, and the new energy trial sample vehicle has the risk of battery system thermal management function failure, which is an important risk item of test work. SUMMARY

[0005] In view of the above problems in the prior art, the application provides a detection method for battery system thermal management function of a trial sample vehicle. Under normal temperature conditions, the battery system thermal management function of the new energy sample vehicle is started through a new energy trial sample vehicle battery system thermal management function test logic, the temperature parameters of the battery system sensor are monitored, and the detection of the battery system thermal management function of the new energy trial sample vehicle is conveniently and quickly realized. The application can improve the working efficiency and detection accuracy of the battery system thermal management function detection of the new energy trial sample vehicle.

[0006] The application is implemented by the following technical scheme:

[0007] A detection method for battery system thermal management function of a trial sample vehicle, specifically comprising the following steps:

[0008] S1: After the sample vehicle is powered on, the cell temperature and the environmental temperature of the power battery are collected.

[0009] S2: Determine whether to activate the battery system heating function based on the highest cell temperature of the power battery and the ambient temperature. If activated, proceed to the next step.

[0010] S3: Real-time monitoring of battery cell temperature and ambient temperature, and determination of whether the battery system heating function is normal based on real-time data; if not, the battery inspection and debugging personnel shall perform signal fault troubleshooting.

[0011] S4: If the heating function is normal, continue to determine whether the battery system cooling function detection condition is enabled. If enabled, proceed to the next step.

[0012] S5: Real-time monitoring of battery cell temperature and ambient temperature, and determination of battery system cooling function based on real-time data; if abnormal, signal fault troubleshooting work shall be performed by battery testing and debugging personnel.

[0013] S6: If both the battery system heating and cooling functions are normal, the prototype vehicle is powered off, and the test ends.

[0014] Furthermore, in step S2, when the highest temperature T of the power battery cell... b_max ≤T0+5℃ and ambient temperature T amb When the temperature is ≤T0+5℃, the test conditions for activating the battery system heating function are met. Here, T0 is the temperature of the constant temperature workshop for trial assembly, which can generally be set to 20℃.

[0015] Furthermore, in step S2, the detection condition for activating the battery system heating function includes: controlling the PTC water heater to start heating, controlling the electric water pump to start, controlling the three-way water valve to realize the internal circulation of the battery system, and executing the battery system heating function.

[0016] Furthermore, in step S3, if the highest cell temperature T of the power battery... b_max The ambient temperature T continues to rise. amb If the temperature remains unchanged, it indicates that the battery system is starting to heat up, and the battery system's heating function is normal.

[0017] Furthermore, in step S3, the three-way water valve needs to be controlled so that the low-temperature coolant does not pass through the radiator, and the cooling fan is controlled to be in the closed state.

[0018] Furthermore, in step S3, if the highest cell temperature T of the power battery... b_max ≥T2+1℃, or ambient temperature T amb When the temperature is ≥T2+1℃, the heating function of the battery system will be turned off; where T2 is the original vehicle program setting temperature, which is generally 39℃.

[0019] Furthermore, in step S4, when the highest temperature T of the power battery cell...b_max ≥T2, and T amb When T ≥ T1, the battery system cooling function detection condition is satisfied, wherein T1 is a temperature set by the original vehicle program, and T1 is generally set to 5 DEG C.

[0020] Further, in step S4, the battery system cooling function detection condition includes: controlling the electric water pump to be turned on, and controlling the three-way water valve to realize the external circulation of the battery system.

[0021] Further, in step S5, if the maximum temperature T of the power battery cell b_max continuously decreases, and the environment temperature T amb remains unchanged, it is indicated that the battery system inside begins to cool down, and the battery system cooling function is normal.

[0022] Further, in step S5, if the maximum temperature T of the power battery cell b_max ≤T4, or the environment temperature T amb ≤T3, the cooling function of the battery system is turned off, wherein T3 is a temperature set by the original vehicle program, and T3 is generally 0 DEG C, and T4 is a temperature set by the original vehicle program, and T4 is generally 35 DEG C.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The detection method for the battery system thermal management function of the trial sample vehicle of the present application can realize the opening of the battery system thermal management function of the new energy sample vehicle, realize the temperature parameter monitoring of the battery system sensor, and conveniently and quickly realize the detection of the battery system thermal management function of the new energy trial sample vehicle under the normal temperature condition. The present application can improve the working efficiency and detection accuracy of the battery system thermal management function detection of the new energy trial sample vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a battery thermal management system;

[0027] Figure 2 FIG. 4 is a flowchart of the detection method for the battery system thermal management function of the trial sample vehicle of the present application. DETAILED DESCRIPTION

[0028] In order to clearly and completely describe the technical solutions of the present application and the specific working process thereof, the specific embodiments of the present application are as follows in combination with the drawings of the accompanying drawings:

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0032] A detection method for testing the thermal management function of a trial vehicle battery system, specifically comprising the following steps:

[0033] S1: After the power supply of the sample vehicle, the temperature of the power battery and the environment temperature are collected;

[0034] S2: According to the highest temperature of the power battery and the environment temperature, it is judged whether to start the battery system heating function detection condition, if yes, go to the next step;

[0035] S3: Real-time detection of the battery cell temperature and the ambient temperature, and judging whether the battery system heating function is normal according to the real-time data; if not, the signal troubleshooting operation is performed by the electric detection debugging personnel;

[0036] S4: If the heating function is normal, it is continuously judged whether the battery system cooling function detection condition is started, if yes, the next step is entered;

[0037] S5: Real-time detection of the battery cell temperature and the ambient temperature, and judging whether the battery system cooling function is normal according to the real-time data; if not, the signal troubleshooting operation is performed by the electric detection debugging personnel;

[0038] S6: If the battery system heating function and the battery system cooling function are both normal, the sample vehicle is powered off, and the detection is ended.

[0039] Embodiment 1

[0040] As Figure 1 shown is a structural schematic diagram of a battery thermal management system; the detection method of the battery system thermal management function of a sample vehicle in this embodiment can be used for different vehicle thermal management systems, and the method realizes the detection capability of the battery system thermal management function at normal temperature; wherein the vehicle control unit is the control center of the thermal management system, according to the detection program, the environmental temperature, the pipeline temperature and the power battery cell temperature signal are collected, the battery system thermal management function opening logic is judged, and then the three-way water valve, the water heating PTC, the electric water pump, the cooling fan and other actuators are controlled to realize the battery system thermal management function.

[0041] The water heating PTC is a battery system heating element, which realizes the opening and closing of the heating function by receiving the LIN signal of the vehicle control unit.

[0042] The electric water pump is a low-temperature cooling liquid circulation power source of the battery thermal management system, which is controlled by the vehicle control unit through the PWM square wave duty cycle to start and stop and accelerate and decelerate.

[0043] The cooling fan can accelerate the cooling speed of the battery thermal management system, which is controlled by the vehicle control unit through the PWM square wave duty cycle to start and stop and accelerate and decelerate.

[0044] The three-way water valve is controlled by the vehicle control unit through the LIN signal to control the opening mode, and the low-temperature cooling liquid can pass through the radiator according to the needs of the thermal management function.

[0045] As Figure 2 shown is a flowchart of the detection method of the battery system thermal management function of a sample vehicle in this embodiment, the detection method comprises:

[0046] A detection method of the battery system thermal management function of a sample vehicle, specifically comprising the following steps:

[0047] S1: Collecting the cell temperature of the power battery and the ambient temperature after the sample vehicle is powered on;

[0048] S2: Determining whether to start the battery system heating function detection condition according to the cell temperature of the power battery and the ambient temperature, and starting the battery system heating function detection condition when the following conditions are met:

[0049] When the maximum cell temperature T b_max of the power battery is less than or equal to T0+5℃ and the ambient temperature T amb is less than or equal to T0+5℃, the battery system heating function detection condition is met, wherein T0 is the temperature of the trial assembly constant temperature workshop, which is set to 20℃ in this embodiment.

[0050] The battery system heating function detection condition includes: controlling the water heating PTC to start heating, controlling the electric water pump to start, controlling the three-way water valve to realize the internal circulation of the battery system, and executing the battery system heating function.

[0051] S3: Real-time detecting the cell temperature of the battery and the ambient temperature, and determining whether the battery system heating function is normal according to the real-time data;

[0052] If the maximum cell temperature T b_max of the power battery is continuously rising and the ambient temperature T amb remains unchanged, it indicates that the battery system starts to heat up, and the battery system heating function is normal.

[0053] The three-way water valve needs to be controlled to make the low-temperature coolant not pass through the radiator, and the cooling air is in a closed state.

[0054] If the maximum cell temperature T b_max of the power battery is greater than or equal to T2+1℃, or the ambient temperature T amb is greater than or equal to T2+1℃, the heating function of the battery system is closed; wherein T2 is the original vehicle program setting temperature, which is set to 39℃ in this embodiment.

[0055] If the above conditions are not met, it indicates that the battery system heating function is abnormal, and the signal fault elimination operation needs to be performed by the electric detection debugging personnel;

[0056] S4: If the heating function is normal, it is determined whether to start the battery system cooling function detection condition, and the battery system cooling function detection condition is started when the following conditions are met:

[0057] When the maximum cell temperature T b_max of the power battery is greater than or equal to T2, and T amb is greater than or equal to T1, the battery system cooling function detection condition is met, wherein T1 is the original vehicle program setting temperature, which is set to 5℃ in this embodiment.

[0058] The detection mode for activating the battery system cooling function includes: controlling the electric water pump to start and controlling the three-way water valve to achieve external circulation of the battery system.

[0059] S5: Real-time monitoring of battery cell temperature and ambient temperature, and determination of whether the battery system cooling function is normal based on real-time data;

[0060] If the highest temperature of the battery cell T b_max The ambient temperature T is continuously decreasing. amb If the temperature remains unchanged, it indicates that the battery system is starting to cool down and the battery system's cooling function is normal.

[0061] If the highest temperature of the battery cell T b_max ≤T4, or ambient temperature T amb When T3 is ≤T3, the cooling function of the battery system is turned off; where T3 is the original vehicle program set temperature, which is set to 0℃ in this embodiment, and T3 is the original vehicle program set temperature, which is set to 35℃ in this embodiment.

[0062] If the above conditions are not met, it indicates that the battery system cooling function is abnormal, and the battery inspection and debugging personnel need to perform signal fault troubleshooting.

[0063] S6: If both the battery system heating and cooling functions are normal, the prototype vehicle is powered off, and the test ends.

[0064] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0066] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method of detecting a battery system thermal management function of a pilot vehicle, characterized by, Specifically comprising the following steps: S1: After the sample vehicle is powered on, the cell temperature and the ambient temperature of the power battery are collected; S2: Whether to start the battery system heating function detection condition is judged according to the highest cell temperature and the ambient temperature of the power battery, if yes, the next step is entered; S3: The cell temperature and the ambient temperature of the battery are detected in real time, and whether the battery system heating function is normal is judged according to the real-time data; if not, the signal troubleshooting operation is performed by the electric detection debugging personnel; S4: If the heating function is normal, whether to start the battery system cooling function detection condition is judged, if yes, the next step is entered; S5: The cell temperature and the ambient temperature of the battery are detected in real time, and whether the battery system cooling function is normal is judged according to the real-time data; if not, the signal troubleshooting operation is performed by the electric detection debugging personnel; S6: If the battery system heating function and the battery system cooling function are both normal, the sample vehicle is powered off, and the detection is ended; In step S2, when the highest temperature T of the power battery cell b_max ≤T0+5℃ and the ambient temperature T amb ≤T0+5℃, the condition for starting the battery system heating function detection is met, wherein T0 is the temperature of the trial assembly constant temperature workshop, which is set to 20℃. In step S3, if the highest temperature T of the power battery cell b_max ≥T2+1℃, or the ambient temperature T amb ≥T2+1℃, the heating function of the battery system is closed; wherein, T2 is the original vehicle program setting temperature, which is set to 39℃. In step S4, when the highest temperature T of the power battery cell b_max ≥ T2, and T amb ≥ T1, the condition for starting the battery system cooling function detection is met, wherein T1 is a temperature set by the original vehicle program and is set to 5℃.

2. The method of claim 1, wherein the method further comprises: In step S2, the starting of the battery system heating function detection condition comprises: controlling the water heating PTC to start heating, controlling the electric water pump to start, controlling the three-way water valve to realize the internal circulation of the battery system, and executing the battery system heating function.

3. The method of claim 1, wherein the method further comprises: In step S3, if the highest temperature T b_max of the power battery cell keeps rising while the ambient temperature T amb remains unchanged, it indicates that the battery system starts to heat up and the heating function of the battery system is normal.

4. The method of claim 1, wherein the method further comprises: In step S3, the three-way water valve needs to be controlled so that the low-temperature cooling liquid does not pass through the radiator, and the cooling air discharge is in a closed state.

5. The method of claim 1, wherein the method further comprises: In step S4, the starting of the battery system cooling function detection condition comprises: controlling the electric water pump to start, and controlling the three-way water valve to realize the external circulation of the battery system.

6. The method of claim 1, wherein the method further comprises: In step S5, if the highest temperature T b_max of the battery cell of the power battery continuously decreases and the ambient temperature T amb remains unchanged, it indicates that the battery system starts to cool down and the cooling function of the battery system is normal.

7. The method of claim 1, wherein the method further comprises: In step S5, if the highest temperature T of the battery cell of the power battery b_max ≤ T4, or the ambient temperature T amb ≤ T3, the cooling function of the battery system is turned off; wherein T3 is a temperature set by the original vehicle program and is set to 0℃; and T4 is a temperature set by the original vehicle program and is set to 35℃.

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