Method and system for testing monomer temperature consistency of battery system

Abstract

The invention specifically discloses a battery system monomer temperature consistency test method and system, and the method comprises the steps: arranging a vehicle battery system on a rack, executing different test items on the rack, collecting the real-time data of the monomer temperature when the battery system executes the test items, and taking the real-time data as true value data; acquiring data sent by the battery management system through the monomer temperature acquisition system to obtain sent data; analyzing the sending data to obtain corresponding monomer temperature data; determining whether the truth value data and the single temperature data at the same moment are consistent or not by comparing the truth value data at the same moment and analyzing the truth value data to obtain the single temperature data; and if not, calculating to obtain an error between the truth value data and the monomer temperature data at the same moment, and judging whether the monomer temperature passes the consistency test or not according to the error. According to the invention, the credibility and effectiveness of the temperature data of the single temperature test can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell temperature testing, and more specifically, to a method and system for testing the temperature consistency of battery cells in a battery system. Background Art

[0002] When a new energy vehicle performs battery cell temperature detection, it obtains and sends battery cell-related temperature data of the battery system from the battery management system. Since the NTC for collecting the battery cell temperature of the battery system is arranged on the top of the battery cell of the battery system, and the battery cell of the battery system has a size and thickness, there is a loss in the heat transfer process, resulting in a certain difference between the battery cell temperature data collected by the NTC and sent to the battery management system and the actual temperature data of the battery cell of the battery system during the start of thermal management and high-rate charge and discharge. This easily causes inaccurate battery cell temperature data and poor credibility of the test results. Therefore, how to provide the accuracy of the battery cell temperature consistency test of the battery system and improve the credibility and safety of the battery cell temperature data is of great significance. Summary of the Invention

[0003] The present invention provides a method and system for testing the temperature consistency of battery cells in a battery system, which solves the problem that the existing battery cell temperature test of the battery system has inaccurate temperature data and is prone to poor credibility of the test results, can improve the credibility and effectiveness of the temperature data of the battery cell temperature test, and increase the accuracy of the test results.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A method for testing the temperature consistency of battery cells in a battery system includes:

[0006] The vehicle battery system is set on a test bench. By performing different test items on the test bench, real-time data of the battery cell temperature of the battery system during the execution of the test items is collected and used as true value data;

[0007] Data sent by the battery management system is obtained through a battery cell temperature acquisition system to obtain sent data;

[0008] The sent data is analyzed to obtain corresponding battery cell temperature data;

[0009] By comparing the true value data and the analyzed battery cell temperature data at the same moment, it is determined whether the true value data and the battery cell temperature data at the same moment are consistent;

[0010] If they are not consistent, the error between the true value data and the battery cell temperature data at the same moment is calculated, and it is determined whether the battery cell temperature passes the consistency test according to the error.

[0011] Preferably, the different test items performed on the test bench include:

[0012] When performing the low-temperature static heating test, the single-cell temperature of the battery system is reduced to -30°C ± 2°C, and the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 45°C until the lowest single-cell temperature of the battery system reaches 10°C.

[0013] Preferably, the different test items performed on the test bench also include:

[0014] When performing the normal-temperature fast charging test, the single-cell temperature of the battery system is maintained at 25°C ± 2°C, the SOC of the battery system is 10%, and charging is carried out according to the charging capacity of the battery system until the SOC of the battery system reaches the maximum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

[0015] Preferably, the different test items performed on the test bench also include:

[0016] When performing the high-temperature fast charging test, the single-cell temperature of the battery system is maintained at 40°C ± 2°C, the SOC of the battery system is 10%, and charging is carried out according to the charging capacity of the battery system until the SOC of the battery system reaches the maximum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

[0017] Preferably, the different test items performed on the test bench also include:

[0018] When performing the high-temperature high-speed driving test, the single-cell temperature of the battery system is maintained at 40°C ± 2°C, with the SOC of the battery system being the maximum usable SOC, and discharging is carried out according to the discharging power required by the whole vehicle at 120 km / h until the SOC of the battery system reaches the minimum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

[0019] Preferably, parsing the transmitted data to obtain the corresponding single-cell temperature data includes:

[0020] Parsing the battery temperature message in the transmitted data according to the communication protocol standard of the battery management system to obtain parsed data, and the parsed data includes: single-cell temperature data.

[0021] Preferably, it also includes:

[0022] If the true value data and the parsed single-cell temperature data at the same moment are consistent, it indicates that the single-cell temperature of the battery system passes the data consistency detection.

[0023] Preferably, it further includes:

[0024] If the error is less than the set threshold value, it is determined that the true value data and the single-cell temperature data are consistent at the same moment.

[0025] The present invention also provides a single-cell temperature consistency test system for a battery system, using the above test method, including: a first acquisition module, a second acquisition module, an analysis module, a detection module, and a calculation module;

[0026] The first acquisition module is used to collect real-time data of the single-cell temperature of the battery system when the battery system executes a test item on a test bench to obtain true value data;

[0027] The second acquisition module is used to collect data sent by the battery system through the battery management system to obtain sent data;

[0028] The analysis module is used to analyze the battery temperature message in the sent data to obtain analysis data, and further obtain single-cell temperature data;

[0029] The detection module is used to determine whether the true value data and the single-cell temperature data are consistent at the same moment by comparing the true value data and the single-cell temperature data at the same moment;

[0030] The calculation module is used to calculate the error between the true value data and the single-cell temperature data at the same moment when the true value data and the single-cell temperature data at the same moment are inconsistent.

[0031] The present invention provides a single-cell temperature consistency test method and system for a battery system, which collect real-time data of the single-cell temperature of the battery system when executing a test item as true value data, and also obtain sent data by acquiring the data sent by the battery management system through the single-cell temperature acquisition system, and analyze the sent data to obtain the corresponding single-cell temperature data, and perform data comparison, and determine whether the data consistency test passes through the error between the two, solving the problem that the existing single-cell temperature test of the battery system has inaccurate temperature data and is likely to cause poor credibility of the test results, and can improve the credibility and effectiveness of the temperature data of the single-cell temperature test, and increase the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below.

[0033] Figure 1 It is a schematic diagram of a single-cell temperature consistency test method for a battery system provided by the present invention.

[0034] Figure 2It is a schematic diagram of a single - cell temperature consistency test system for a battery system provided by the present invention. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and implementation manners.

[0036] Aiming at the problem of poor credibility of the test results of the single - cell temperature of the current battery system, the present invention provides a method and system for testing the single - cell temperature consistency of a battery system, which solves the problems that the temperature data in the existing single - cell temperature test of the battery system is inaccurate and easily causes poor credibility of the test results, can improve the credibility and effectiveness of the temperature data in the single - cell temperature test, and increase the accuracy of the test results.

[0037] As Figure 1 shown, a method for testing the single - cell temperature consistency of a battery system includes:

[0038] S1: The vehicle battery system is set on a test bench. By performing different test items on the test bench, real - time data of the single - cell temperature of the battery system when performing the test items is collected and used as true - value data.

[0039] S2: Data sent by the battery management system is obtained through the single - cell temperature acquisition system to obtain the sent data.

[0040] S3: The sent data is parsed to obtain the corresponding single - cell temperature data.

[0041] S4: By comparing the true - value data and the parsed single - cell temperature data at the same moment, it is determined whether the true - value data and the single - cell temperature data at the same moment are consistent.

[0042] S5: If they are not consistent, the error between the true - value data and the single - cell temperature data at the same moment is calculated, and whether the single - cell temperature passes the consistency test is determined according to the error.

[0043] Specifically, by performing different test items on the test bench, real-time temperature data of the battery system during the execution of the items is collected as the true value data. By collecting the data sent by the battery system through the battery management system, the sent data is obtained. There may be a certain difference between these data and the actual temperature data of the top of the battery system monomer and the center of the battery system monomer collected by the NTC. The true value data comes from the real-time data related to the temperature of the battery system monomer during the execution of the items collected by the battery system, that is, the actual data of the monomer temperature. The parsed data is obtained after parsing according to the data sent by the battery system through the battery management system. Both the true value data and the parsed data contain the moments corresponding to the battery system monomer temperature data. Select the true value data and the parsed data at the same moment and compare whether they are consistent. If they are inconsistent, error calculation is performed to determine whether the consistency test is passed. This method can improve the credibility and effectiveness of the temperature data of the monomer temperature test and increase the accuracy of the test results.

[0044] Further, the performing different test items on the test bench includes:

[0045] When performing the low-temperature static heating test, the temperature of the battery system monomer is reduced to -30°C ± 2°C, and the battery system liquid cooling system is passed with 18 L / min of coolant with a water temperature of 45°C until the lowest temperature of the battery system monomer reaches 10°C.

[0046] Further, the performing different test items on the test bench also includes:

[0047] When performing the normal-temperature fast charging test, the temperature of the battery system monomer is maintained at 25°C ± 2°C, the battery system SOC is 10%, and charging is performed according to the charging capacity of the battery system until the battery system SOC reaches the maximum usable SOC. When the highest temperature of the battery system monomer reaches 38°C, the battery system liquid cooling system is passed with 18 L / min of coolant with a water temperature of 15°C.

[0048] Further, the performing different test items on the test bench also includes:

[0049] When performing the high-temperature fast charging test, the temperature of the battery system monomer is maintained at 40°C ± 2°C, the battery system SOC is 10%, and charging is performed according to the charging capacity of the battery system until the battery system SOC reaches the maximum usable SOC. When the highest temperature of the battery system monomer reaches 38°C, the battery system liquid cooling system is passed with 18 L / min of coolant with a water temperature of 15°C.

[0050] Further, the performing different test items on the test bench also includes:

[0051] When conducting high-temperature and high-speed driving tests, the temperature of each battery cell in the battery system is maintained at 40°C ± 2°C. Using the highest available State of Charge (SOC) of the battery system, and according to the discharge power required by the vehicle at 120 km / h, the test continues until the SOC of the battery system reaches the lowest available SOC. When the highest temperature of each battery cell in the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with coolant at a rate of 18 L / min and a water temperature of 15°C.

[0052] Further, the transmitted data is analyzed to obtain the corresponding cell temperature data, including:

[0053] The battery temperature message in the transmitted data is analyzed according to the communication protocol standard of the battery management system to obtain the analyzed data, which includes cell temperature data.

[0054] Specifically, the data sent by the battery system through the battery management system is usually data encapsulated according to the communication protocol standard of the battery management system. Therefore, it needs to be analyzed, mainly to analyze the temperature of each battery cell in the battery system to obtain the analyzed data.

[0055] The method further includes: if the true value data and the obtained cell temperature data at the same moment are consistent, it indicates that the cell temperature of the battery system passes the data consistency test.

[0056] Further, based on the error, it is determined whether the cell temperature passes the consistency test, including: if the error is less than the set threshold, it is determined that the true value data and the cell temperature data are consistent at the same moment.

[0057] It can be seen that the present invention provides a method for testing the consistency of the cell temperature of a battery system. It collects the real-time data of the cell temperature of the battery system during the execution of the test project as the true value data, and also obtains the data sent by the battery management system through the cell temperature acquisition system to get the transmitted data, and analyzes the transmitted data to obtain the corresponding cell temperature data for data comparison. By determining whether the data consistency test passes based on the error between the two, it solves the problem that the existing cell temperature test of the battery system has inaccurate temperature data and is prone to poor credibility of the test results. It can improve the credibility and effectiveness of the temperature data of the cell temperature test and increase the accuracy of the test results.

[0058] Accordingly, the present invention further provides a system for testing the temperature consistency of individual cells in a battery system, which uses the above-mentioned testing method and includes: a first acquisition module, a second acquisition module, an analysis module, a detection module, and a calculation module. The first acquisition module is used to collect real-time data of the individual cell temperatures in the battery system when the battery system executes a test item on a test bench to obtain true value data. The second acquisition module is used to collect the data sent by the battery management system of the battery system to obtain sent data. The analysis module is used to analyze the battery temperature message in the sent data to obtain analysis data, and further obtain individual cell temperature data. The detection module is used to determine whether the true value data and the individual cell temperature data at the same moment are consistent by comparing the true value data and the individual cell temperature data at the same moment. The calculation module is used to calculate the error between the true value data and the individual cell temperature data at the same moment when the true value data and the individual cell temperature data at the same moment are inconsistent.

[0059] Through precise monitoring of the individual cell temperatures in the battery system, it is possible to ensure that the battery system operates within the optimal temperature range, thereby improving the power density and energy density of the battery system and extending the service life of the battery system.

[0060] Precise monitoring of the individual cell temperatures in the battery system helps to promptly detect overheating of individual cells in the battery system, prevent thermal runaway of individual cells in the battery system, reduce the risk of fire and explosion, and increase safety.

[0061] Based on precise individual cell temperature data of the battery system, the thermal management system of the battery system, such as a liquid cooling or air cooling system, can be designed and controlled more effectively to keep the battery system operating at an appropriate temperature.

[0062] By avoiding the battery system operating at extreme temperatures, the aging of the battery system can be reduced and the service life of the battery system can be extended.

[0063] Precise temperature monitoring can improve the control strategy of the battery management system, thereby enhancing the reliability of the entire battery system.

[0064] It can be seen that the present invention provides a system for testing the temperature consistency of individual cells in a battery system, which collects real-time data of the individual cell temperatures in the battery system when the battery system executes a test item and uses it as true value data. It also obtains sent data by acquiring the data sent by the battery management system through the individual cell temperature acquisition system, analyzes the sent data to obtain the corresponding individual cell temperature data, conducts data comparison, and determines whether the data consistency test passes based on the error between the two, solving the problem that the existing individual cell temperature test in the battery system has inaccurate temperature data and is prone to poor credibility of the test results. It can improve the credibility and effectiveness of the temperature data in the individual cell temperature test and increase the accuracy of the test results.

[0065] The structure, features and effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention. However, the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to equivalent changes, that still do not exceed the spirit covered by the specification and the drawings should be within the protection scope of the present invention.

Claims

1. A method for testing the temperature consistency of single cells in a battery system, characterized in that, Including: The vehicle battery system is set on a test bench. By performing different test items on the test bench, real-time data of the single-cell temperature of the battery system during the execution of the test items is collected and used as true value data. Data sent by the battery management system is obtained through the single-cell temperature acquisition system to get the sent data. The sent data is parsed to obtain the corresponding single-cell temperature data. By comparing the true value data and the parsed single-cell temperature data at the same moment, it is determined whether the true value data and the single-cell temperature data at the same moment are consistent. If they are inconsistent, the error between the true value data and the single-cell temperature data at the same moment is calculated, and whether the single-cell temperature passes the consistency test is determined according to the error.

2. The method for testing the consistency of the individual cell temperatures of the battery system according to claim 1, wherein The performing different test items on the test bench includes: When performing the low-temperature static heating test, the single-cell temperature of the battery system is reduced to -30°C ± 2°C, and the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 45°C until the lowest single-cell temperature of the battery system reaches 10°C.

3. The method for testing the consistency of the individual cell temperatures of the battery system according to claim 2, wherein The performing different test items on the test bench further includes: When performing the normal-temperature fast charging test, the single-cell temperature of the battery system is maintained at 25°C ± 2°C, the SOC of the battery system is 10%, and charging is carried out according to the charging capacity of the battery system until the SOC of the battery system reaches the maximum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

4. The method for testing the consistency of the single cell temperatures of the battery system according to claim 3, wherein, The performing different test items on the test bench further includes: When performing the high-temperature fast charging test, the single-cell temperature of the battery system is maintained at 40°C ± 2°C, the SOC of the battery system is 10%, and charging is carried out according to the charging capacity of the battery system until the SOC of the battery system reaches the maximum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

5. The method for testing the consistency of the individual cell temperatures of the battery system according to claim 4, wherein The performing different test items on the test bench further includes: When performing the high-temperature high-speed driving test, the single-cell temperature of the battery system is maintained at 40°C ± 2°C, with the SOC of the battery system being the maximum usable SOC, and discharging is carried out according to the discharging power required by the whole vehicle at 120 km / h until the SOC of the battery system reaches the minimum usable SOC. When the highest single-cell temperature of the battery system reaches 38°C, the liquid cooling system of the battery system is supplied with 18 L / min of coolant with a water temperature of 15°C.

6. The method for testing the consistency of the single cell temperature of the battery system according to claim 5, characterized in that, The parsing the sent data to obtain the corresponding single-cell temperature data includes: Parsing the battery temperature message in the sent data according to the communication protocol standard of the battery management system to obtain parsed data, and the parsed data includes: single-cell temperature data.

7. The method for testing the consistency of the single cell temperature of the battery system according to claim 6, wherein It further includes: If the true value data and the parsed single-cell temperature data at the same moment are consistent, it indicates that the single-cell temperature of the battery system passes the data consistency detection.

8. The method for testing the consistency of the individual cell temperatures of the battery system according to claim 7, wherein It further includes: If the error is less than the set threshold, it is determined that the true value data and the single-cell temperature data are consistent at the same moment.

9. A single - cell temperature consistency test system for a battery system, using the test method according to any one of claims 1 to 8, characterized in that, Including: A first acquisition module, a second acquisition module, a parsing module, a detection module, and a calculation module; The first acquisition module is used to acquire real-time data of the individual battery temperatures of the battery system when the battery system executes test items on the bench, so as to obtain true value data; The second acquisition module is used to acquire the data sent by the battery system through the battery management system to obtain the sent data; The parsing module is used to parse the battery temperature message in the sent data to obtain parsed data, and further obtain individual battery temperature data; The detection module is used to determine whether the true value data and the individual battery temperature data at the same moment are consistent by comparing the true value data and the individual battery temperature data at the same moment; The calculation module is used to calculate the error between the true value data and the individual battery temperature data at the same moment when the true value data and the individual battery temperature data at the same moment are inconsistent.

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