CN-121978527-A - Power battery thermal management optimizing test method and system based on energy conservation

CN121978527ACN 121978527 ACN121978527 ACN 121978527ACN-121978527-A

Abstract

The application discloses a power battery thermal management optimizing test method and system based on energy conservation, which relate to the field of vehicle battery thermal management and comprise the steps of constructing a power battery thermal management strategy optimizing integrated test system, wherein the system comprises an upper computer, controlled thermal management executing equipment, environment simulation equipment and battery test equipment; setting a quantifiable thermal performance target for a battery system to be tested according to a thermal management working condition of a power battery target, iteratively optimizing output power of a thermal management component in an integrated test system based on the thermal performance target to determine optimal thermal management component power meeting thermal performance requirements, iteratively optimizing target temperature of a thermal management medium according to the optimal thermal management component power to determine an optimal medium temperature set point meeting the thermal performance requirements, and matching the optimal thermal management component power and the optimal medium temperature set point to a corresponding power battery system and a thermal management control strategy thereof to improve energy conservation and reliability of the thermal management control strategy.

Inventors

ZHENG JIEJIE
DING MIAO
MA MING
XUE YUFENG
LI SONGSONG
Han Bingxu
MEI XIAOQING

Assignees

一汽解放汽车有限公司

Dates

Publication Date: 20260505
Application Date: 20260227

Claims (10)

1. The power battery thermal management optimizing test method based on energy conservation is characterized by comprising the following steps of: Step S1, constructing a power battery thermal management strategy optimizing integrated test system, wherein the system comprises an upper computer, controlled thermal management execution equipment, environment simulation equipment and battery test equipment; step S2, setting a thermal performance target for the battery system to be tested according to a target thermal management working condition of the power battery; step S3, based on the thermal performance target, iteratively optimizing the output power of the thermal management component in the integrated test system, and determining the optimal thermal management component power meeting the thermal performance requirement; s4, performing iterative optimization on the target temperature of the thermal management medium according to the optimal thermal management component power, and determining an optimal medium temperature set point meeting the thermal performance requirement; And step S5, matching the optimal heat management component power and the optimal medium temperature set point into corresponding power battery systems and a heat management control strategy thereof.
2. The energy-saving-based power battery thermal management optimizing test method according to claim 1, wherein the target thermal management working conditions comprise a power battery low-temperature heating working condition and a quick charge cooling working condition; And when the cooling condition is the fast-charging cooling condition, replacing the thermal management power with refrigeration power, replacing the medium target temperature with the cooling medium target temperature, and repeating the steps S3-S5 to finish the thermal management strategy optimization of the fast-charging cooling condition.
3. The energy-saving-based power battery thermal management optimizing test method according to claim 1, wherein the thermal management power adjustment mode of the multiple iteration test comprises: comparing the actual thermal performance data of the single test with the quantifiable thermal performance target, and if the actual thermal performance data is lower than the target, increasing the thermal management power to perform the next test; if the actual thermal performance data meets or is higher than the target, reducing the thermal management power to perform the next test; Based on the product model sequence of the existing thermal management component, discretized thermal management power selection and iterative testing are performed.
4. The energy-saving-based power battery thermal management optimizing test method according to claim 1 is characterized by comprising the steps of taking the initial medium target temperature as a starting point, sequentially decreasing and setting the medium target temperature according to a preset fixed temperature step length, and carrying out iterative test.
5. The energy-saving-based power battery thermal management optimizing test method as claimed in claim 1, comprising the steps of: The calculation and determination modes of the optimal medium temperature set point are as follows: Stopping the iterative test when the actual thermal performance data at a certain medium temperature is lower than the thermal performance target, and obtaining a theoretical medium temperature value meeting the target through linear interpolation calculation between the medium temperature and the last test medium temperature; And correcting the theoretical medium temperature value by combining the control precision and the performance allowance of the power battery thermal management system to obtain a final optimal medium temperature set point.
6. The energy-saving-based power battery thermal management optimizing test method according to claim 1, wherein the method comprises a single test flow of switching a constant temperature mode after the constant power mode is operated until the medium temperature reaches the standard, specifically comprising the following steps: A1, the upper computer controls the constant-power water cooler to operate with the current set thermal management power constant power, and heats or refrigerates the cooling liquid and the battery system to be tested; a2, when the outlet temperature of the cooling liquid reaches the currently set target medium temperature, the constant-power water cooler is automatically switched to continuously operate in a constant-temperature mode with the target medium temperature as a set value; a3, monitoring the core temperature of the battery system to be tested in real time, stopping the test when the core temperature reaches a preset target temperature, and recording the total test duration; And A4, calculating actual thermal performance data of the test according to the total test duration.
7. The energy-saving-based power battery thermal management optimizing test method as claimed in claim 1, comprising the steps of: The iteration test is an automatic iteration test, wherein an iteration control module is arranged in the upper computer, and the module automatically adjusts the thermal management power or the medium target temperature of the next test according to the comparison result of the actual thermal performance data of the single test and the thermal performance target and automatically starts the next iteration test.
8. A power cell thermal management strategy optimization test system implementing the method of any one of claims 1-7, comprising: The system comprises an upper computer, a controlled thermal management execution module, an environment simulation module, a battery system to be tested and a battery test module; The controlled heat management execution module has refrigeration and heating functions, can run at constant power according to a set power value or at constant temperature according to a set medium temperature value, and is used for providing heating or refrigeration heat management service for a battery system to be tested; The battery test module is used for applying charge and discharge loads to the battery system to be tested and simulating the actual driving and quick charging electric conditions of the power battery; The environment simulation module is used for providing and accurately controlling initial environment temperature required by the test, so that the core body temperature of the battery system to be tested is uniformly and stably up to a preset initial temperature; The battery system to be tested comprises a battery module or a battery pack and a heat management flow channel integrated in the battery module or the battery pack; the upper computer is respectively connected with the constant-power water cooler, the battery charge and discharge equipment, the environmental bin and the battery system to be tested through a CAN or Ethernet communication bus and is used as a system control center for setting test parameters, controlling the start and stop of a test flow, synchronously collecting test data of the whole system, calculating actual thermal performance data and executing two-stage iterative optimization.
9. The electronic equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; the memory has stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of a power cell thermal management optimization test method based on energy conservation as claimed in any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that it stores a computer program executable by an electronic device, which when run on the electronic device causes the electronic device to perform the steps of a power battery thermal management optimization test method based on energy saving according to any one of claims 1-7.

Description

Power battery thermal management optimizing test method and system based on energy conservation Technical Field The invention relates to the field of vehicle battery thermal management, in particular to an energy-saving-based power battery thermal management optimizing test method, an energy-saving-based power battery thermal management optimizing test system, electronic equipment and a storage medium. Background With the rapid development of new energy automobiles, thermal management (BTMS) of a power battery system plays a decisive role in guaranteeing performance, safety and service life of the power battery system. Under the low-temperature environment, the battery needs to be heated quickly to recover the discharging capability, and under the high-rate working conditions such as quick charge and the like, the battery needs to be cooled effectively to prevent thermal runaway. Currently, the type selection and operation parameter setting of a thermal management system (such as a heat pump, a PTC heater, a water cooling machine and the like) mainly depend on theoretical calculation, simulation or engineering experience. The existing method has obvious defects that firstly, the component type selection (such as heat pump power) is often estimated and the safety margin is increased based on the worst working condition, so that the excessive power design is easy to cause the rise of equipment cost, the increase of energy consumption and the waste of space. Second, even when a component of a certain power is selected, its operating parameters (e.g., target cooling medium temperature) are typically empirically set and fail to match the thermal characteristics of the particular battery system, resulting in low operating energy efficiency. This is contrary to the design goals of energy saving and light weight of electric automobiles. Therefore, a method for optimizing the thermal management component model selection and the operation control strategy for a specific battery system through systematic experiments is needed to achieve the full link energy efficiency improvement from hardware matching to software control. Disclosure of Invention In view of the above, the present invention aims to provide a power battery thermal management optimizing test method, a system, an electronic device and a storage medium based on energy saving, which aims to solve the problems of experience dependence and poor energy efficiency of the power battery thermal management system design in the prior art. The invention provides the following scheme: according to one aspect of the application, there is provided an energy-saving-based power battery thermal management optimizing test method, comprising the steps of: Constructing a power battery thermal management strategy optimizing integrated test system, wherein the system comprises an upper computer, a constant power water cooling machine, battery charge and discharge equipment, an environment bin and a battery system to be tested, wherein the constant power water cooling machine, the battery charge and discharge equipment, the environment bin and the battery system to be tested are respectively connected with the upper computer through a CAN or Ethernet communication bus; Setting a quantifiable thermal performance target for the battery system to be tested according to a target thermal management working condition of the power battery; Performing first-stage heat management component power optimizing, namely placing the battery system to be tested in the environment bin until the core body temperature is uniformly stabilized to a preset initial temperature, setting initial heat management power and initial medium target temperature, controlling the constant-power water cooling machine to run in a constant-power mode until the medium temperature reaches the standard by the upper computer, performing repeated iterative tests on the battery system to be tested, obtaining a plurality of groups of heat management power values and corresponding actual heat performance data, and selecting the minimum heat management power value meeting the target as the optimal heat management component power based on the quantifiable heat performance target; Fixing the output power of the constant-power water cooling machine, adjusting the medium target temperature by taking the initial medium target temperature as a reference, controlling the constant-power water cooling machine to perform repeated iterative tests on the battery system to be tested in the same constant-power constant-temperature mode through the upper computer, obtaining a plurality of groups of medium temperature values and corresponding actual thermal performance data under fixed power, and calculating to obtain an optimal medium temperature set point meeting the target based on the quantifiable thermal performance target; and outputting a thermal management optimal strategy of the battery system to be tested, namely matching a therm