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EP-4382936-B1 - PERFORMANCE TEST METHOD FOR BATTERY THERMAL MANAGEMENT SYSTEM, AND RELATED DEVICE

EP4382936B1EP 4382936 B1EP4382936 B1EP 4382936B1EP-4382936-B1

Inventors

  • WANG, YANG

Dates

Publication Date
20260506
Application Date
20220630

Claims (9)

  1. A performance detection method of a battery thermal management system, wherein the method comprises: (S101) acquiring battery pack operating condition data of a current electric vehicle in a current preset time period; (S102) building a current battery temperature matrix based on the battery pack operating condition data, wherein the current battery temperature matrix is a three-dimensional matrix of battery pack output voltage subintervals, battery pack output current subintervals, and maximum temperatures of individual battery cells in the battery pack, wherein the (S102) building the current battery temperature matrix based on the battery pack operating condition data specifically comprises: - (S201) dividing all battery pack output voltages in the battery pack operating condition data into N1 battery pack output voltage subintervals, wherein N1 is a positive integer; - (S202) dividing all battery pack output currents in the battery pack operating condition data into M1 battery pack output current subintervals, wherein M1 is a positive integer; - (S203) calculating an average value of all raw maximum temperatures of individual battery cells simultaneously corresponding to respective battery pack output voltage subintervals and respective battery pack output current subintervals in the battery pack operating condition data, and taking the average value as the maximum temperature of individual battery cells in the battery pack corresponding to the respective battery pack output voltage subinterval and respective battery pack output current subinterval; and (S204) building the current battery temperature matrix based on the N1 battery pack output voltage subintervals, the M1 battery pack output current subintervals and corresponding maximum temperature of individual battery cells; (S103) forming a quotient of each maximum temperature of individual battery cells in the current battery temperature matrix and a corresponding reference maximum temperature of individual battery cells in a pre-built reference battery temperature matrix to obtain a temperature offset of individual battery cells, wherein the maximum temperature of individual battery cells and the reference maximum temperature of individual battery cells correspond to a same battery pack output voltage subinterval and a same battery pack output current subinterval; and (S104) averaging all the temperature offsets of individual battery cells to obtain a degradation factor characterizing performance degradation of the battery thermal management system.
  2. The performance detection method according to claim 1, wherein the (S101) acquiring the battery pack operating condition data of the current electric vehicle in the current preset time period specifically comprises: acquiring raw battery pack operating condition data of the current electric vehicle in the current preset time period; and removing battery pack operating condition data in the raw battery pack operating condition data which does not meet a preset continuous operating condition of the vehicle based on a timestamp in the raw battery pack operating condition data, to obtain the battery pack operating condition data, wherein the preset continuous operating condition of the vehicle is determined according to a duration or distance of travel of the continuous operations of the electric vehicle.
  3. The performance detection method according to claim 1, wherein a build process of the reference battery temperature matrix comprises: (S301) acquiring historical battery pack operating condition data of the electric vehicle in a historical preset time period; (S302) removing historical battery pack operating condition data which does not meet a preset continuous operating condition of the vehicle from the historical battery pack operating condition data based on a timestamp in the historical battery pack operating condition data, to obtain target historical operating condition data; (S303) dividing all historical battery pack output voltages in the target historical operating condition data into N2 historical battery pack output voltage subintervals, wherein N2 is a positive integer; (S304) dividing all historical battery pack output currents in the target historical operating condition data into M2 historical battery pack output current subintervals, wherein M2 is a positive integer; (S305) calculating an average value of all historical maximum temperatures of individual battery cells simultaneously corresponding to respective historical battery pack output voltage subintervals and respective historical battery pack output current subintervals in the target historical operating condition data, and taking the average value as the reference maximum temperature of individual battery cells; and (S306) building the reference battery temperature matrix based on the N2 historical battery pack output voltage subintervals, the M2 historical battery pack output current subintervals and corresponding reference maximum temperature of individual battery cells.
  4. The performance detection method according to claim 1, wherein after (S104) averaging all the temperature offsets of individual battery cells to obtain the degradation factor characterizing performance degradation of the battery thermal management system, the performance detection method further comprises: comparing the degradation factor with an degradation threshold; and outputting prompt information for abnormal performance of the battery thermal management system when the degradation factor is less than the degradation threshold.
  5. The performance detection method according to claim 1, wherein the (S104) averaging all the temperature offsets of individual battery cells to obtain the degradation factor characterizing performance degradation of the battery thermal management system specifically comprises: building a current battery temperature offset matrix based on the temperature offsets of individual battery cells, and the battery pack output voltage subintervals and the battery pack output current subintervals in the current battery temperature matrix; and averaging all the temperature offsets of individual battery cells in the current battery temperature offset matrix to obtain the degradation factor.
  6. A performance detection apparatus of a battery thermal management system, wherein the performance detection apparatus comprises: a data acquisition unit (401) configured for acquiring battery pack operating condition data of a current electric vehicle in a current preset time period; a first matrix build unit (402) configured for building a current battery temperature matrix based on the battery pack operating condition data, wherein the current battery temperature matrix is a three-dimensional matrix of battery pack output voltage subintervals, battery pack output current subintervals, and maximum temperature of individual battery cells in the battery pack, wherein the first matrix build unit specifically comprises: - a first voltage dividing subunit (501) configured for dividing all battery pack output voltages in the battery pack operating condition data into N1 battery pack output voltage subintervals, wherein N1 is a positive integer; - a first current dividing subunit (502) configured for dividing all battery pack output currents in the battery pack operating condition data into M1 battery pack output current subintervals, wherein M1 is a positive integer; - a first calculation subunit (503) configured for calculating an average value of all raw maximum temperature of individual battery cells simultaneously corresponding to respective battery pack output voltage subintervals and respective battery pack output current subintervals in the battery pack operating condition data, and taking the average value as the maximum temperature of individual battery cell in the battery pack corresponding to the respective battery pack output voltage subinterval and respective battery pack output current subinterval; and - a first matrix build subunit (504) configured for building the current battery temperature matrix based on the N1 battery pack output voltage subintervals, the M1 battery pack output current subintervals and corresponding maximum temperature of individual battery cells; an offset determination unit (403) configured for forming a quotient of each maximum temperature of individual battery cell in the current battery temperature matrix and corresponding reference maximum temperature of individual battery cell in a pre-built reference battery temperature matrix to obtain a temperature offset of individual battery cell, wherein the maximum temperature of individual battery cell and the reference maximum temperature of individual battery cell correspond to a same battery pack output voltage subinterval and a same battery pack output current subinterval; and an degradation factor determination unit (404) configured for averaging all temperature offsets of individual battery cells to obtain a degradation factor characterizing performance degradation of the battery thermal management system.
  7. The performance detection apparatus according to claim 6, wherein the performance detection apparatus further comprises: a comparison unit configured for comparing the degradation factor with an degradation threshold after the averaging all the temperature offsets of individual battery cells to obtain the degradation factor characterizing performance degradation of the battery thermal management system by the degradation factor determination unit; and an information output unit configured for outputting prompt information for abnormal performance of the battery thermal management system when the degradation factor is less than the degradation threshold.
  8. A performance detection system of a battery thermal management system, wherein the performance detection system comprises a vehicle-mounted mobile terminal (601), a Telematics Service Provider, TSP, cloud platform (602) and a big data cloud platform (603), wherein the big data cloud platform (603) comprises the performance detection apparatus of the battery thermal management system according to any of claims 6 to 8; the vehicle-mounted mobile terminal (601) is configured for collecting battery pack operating condition data of a current electric vehicle in a current preset time period; and the TSP cloud platform (602) is respectively connected to the vehicle-mounted mobile terminal (601) and the big data cloud platform (603), and is configured for sending the battery pack operating condition data collected by the vehicle-mounted mobile terminal (601) to the big data cloud platform (603).
  9. A computer-readable storage medium, wherein the computer-readable storage medium is stored with at least one instruction which, when executed by a processor, realizes the performance detection method of the battery thermal management system according to any one of claims 1 to 5.

Description

TECHNICAL FIELD The present invention relates to a performance detection method of a battery thermal management system and a related device apparatus, a performance detection system of a battery thermal management system, and a computer-readable storage medium. BACKGROUND A battery pack, as a core component of an electric vehicle, directly affects operation performance of the electric vehicle. When the electric vehicle drives under different operation conditions, the battery pack discharges at different rates, and a large amount of heat may be generated, which causes uneven heat accumulation with time and influence of space, resulting in uneven temperature distribution in the battery pack, thus affecting consistency of battery cells. If the whole battery pack is not ventilated and cooled in time at high temperature and excessively high operation temperature and excessive temperature difference are not alleviated, charging and discharging cycle efficiency of the battery pack may be reduced, power and energy usage of the battery pack may be affected, and thermal runaway may be caused in serious cases, which may eventually affect safety and reliability of the battery pack. In order to optimize functioning of the battery pack and prolong service life of the battery pack, a battery thermal management system is mainly adopted to control temperature of the battery pack. The battery thermal management system is configured to adjust against possible influence of external environment temperature on the battery pack and balance internal temperature difference of the battery pack in manners such as cooling and temperature balancing, so as to keep the temperature of the battery pack within a reasonable range. Therefore, when the performance of the battery thermal management system degrades or even fails, the charging and discharging cycle efficiency and the power of the battery pack may be affected, and even results in the thermal runaway of the battery pack in serious cases, which may eventually affect safety and reliability of the battery pack. Therefore, it becomes an urgent technical problem to be solved by the skilled in the art to detect performance of the battery thermal management system. US 2020/110134 A1 discloses a status detection system for a battery including a data acquisition circuit, a non-transitory machine-readable storage medium, and a controller. The data acquisition circuit monitors statuses of the battery to generate status data indicative of the statuses. The storage medium stores a set of machine-readable lookup tables. A lookup table of the lookup tables includes a set of datasets corresponding to a set of time frames. Each dataset of the datasets includes digital values of a set of parameters of the battery obtained in a corresponding time frame of the frames. The controller receives the status data and updates the lookup tables based on the status data. The controller also obtains a current dataset of the parameters based on the status data, searches the lookup table for a previous dataset that matches the current dataset, compares a current value of a parameter in the current dataset with a previous value of the parameter in the previous dataset, and determines whether a potential fault is present in the battery based on a result of the comparison. SUMMARY In view of the above, it is an object of the present invention to provide a performance detection method of a battery thermal management system and a related apparatus, a performance detection system of a battery thermal management system, and a computer-readable storage medium, so as to realize performance detection of the battery thermal management system. The object is achieved by the features of the independent claim 1 regarding the method, with the features of independent claim 7 regarding the related apparatus, with the features of claim 10 regarding the system, and with the features of claim 11 regarding the computer-readable storage medium. Further embodiments are defined in the dependent claims. As can be seen from above technical schemes, the performance detection method of the battery thermal management system and the related device in accordance with the present invention, in which the current battery temperature matrix is built based on the battery pack operating condition data of the current electric vehicle in the current preset time period, the current battery temperature matrix is the three-dimensional matrix of the battery pack output voltage subintervals, the battery pack output current subintervals, and the maximum temperatures of individual battery cells in the battery pack. The quotient of each maximum temperature of individual battery cells in the current battery temperature matrix and the corresponding reference maximum temperature of individual battery cells in a pre-built reference battery temperature matrix is formed so as to obtain the temperature offset of individual battery cells , and all temperature offsets