Vehicle discharge current control method and device, electronic equipment and storage medium

Abstract

The application provides a vehicle discharge current control method and device, electronic equipment and a storage medium. The working parameters of the initialized power battery are obtained, and then the target working state of the power battery can be determined. The target working state can be used to determine the lower limit current. According to the specific working state, the corresponding current determination mode can be adaptively determined according to the current driving state and the target working state. The size of the vehicle discharge current is controlled through the lower limit current. At the same time, according to the thermal management process, it can be ensured that the discharge working condition of the power battery is in a safe state. Therefore, the flexibility and accuracy of the vehicle discharge current control are improved, and the safety of the power battery during the working process is also improved.

Description

Technical Field

[0001] This application relates to automotive power battery technology, and more particularly to a vehicle discharge current control method, device, electronic device, and storage medium. Background Technology

[0002] Currently, in the technology of new energy vehicle power batteries, the battery management system is difficult to meet the requirements of users in various driving scenarios. Specifically, in low-temperature environments, when new energy vehicles are discharging while driving, due to the electrochemical characteristics of lithium-ion batteries and battery safety design, the battery system requests the activation of driving heating. However, after the heating device in the battery module is activated, it will cause a decrease in the discharge current rate and a reduction in vehicle power during driving, failing to meet the driving requirements in low-temperature environments and further affecting the driving experience. In high-temperature scenarios, it is also necessary to ensure that the power battery discharges under safe operating conditions.

[0003] To address the aforementioned issues, the discharge current can typically be adjusted. However, current vehicle discharge current control methods lack flexibility and accuracy in current adjustment, and these methods also reduce power supply efficiency. Therefore, a new vehicle discharge current control method is needed to improve the flexibility and accuracy of vehicle discharge current control. Summary of the Invention

[0004] This application provides a vehicle discharge current control method, device, electronic device, and storage medium to solve the problems of poor flexibility and accuracy of current power battery current adjustment and reduced power supply efficiency caused by current discharge current adjustment methods.

[0005] In a first aspect, this application provides a vehicle discharge current control method, comprising:

[0006] The target vehicle's power battery is initialized according to the preset high-voltage power-on procedure.

[0007] Obtain the operating parameters of the power battery;

[0008] Determine the target operating state of the power battery based on the operating parameters;

[0009] According to the preset thermal management process, the current working state of the power battery is adjusted to the target working state;

[0010] Based on the target operating state, determine the lower limit current, and based on the lower limit current, determine the discharge current of the power battery;

[0011] Among them, the discharge current is greater than or equal to the lower limit current, which includes the power system output current and the temperature control system output current. The power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state.

[0012] As an optional implementation, the target operating state includes a normal discharge state, a heating and discharging state, and a cooling and discharging state. The power system output current includes a first maximum output current, a second maximum output current, or a third maximum output current. The temperature control system output current includes a heating load current or a cooling load current.

[0013] Based on the target operating state, determine the lower limit current, and based on the lower limit current, determine the discharge current of the power battery, including:

[0014] If the target operating state is normal discharge state, the discharge current of the power battery is determined based on the first maximum output current.

[0015] If the target operating state is simultaneous heating and discharging, then the discharge current of the power battery is determined based on the heating load current and the second maximum output current.

[0016] If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery is determined based on the cooling load current and the third maximum output current.

[0017] Among them, the cooling load current is used to indicate the load condition of the cooling process, the heating load current is used to indicate the load condition of the heating process, and the first maximum output current, the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle and are used to indicate the load current of the high voltage discharge of the power battery under the corresponding target working state.

[0018] As an optional implementation, the operating parameters include the battery state of charge, minimum battery temperature, maximum battery temperature, and individual cell voltage. Based on these operating parameters, the target operating state of the power battery is determined, including:

[0019] Determine whether the operating parameters meet the heating conditions;

[0020] If it is determined that the working parameters meet the heating conditions, then the target working state of the power battery is determined to be a state of simultaneous heating and discharging.

[0021] If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

[0022] As an optional implementation, the operating parameters also include battery temperature difference, current discharge current and battery operating command, and the battery temperature difference is determined by the minimum battery temperature and the maximum battery temperature.

[0023] The method also includes:

[0024] If it is determined that the operating parameters do not meet the heating conditions and do not meet the cooling conditions, or if the current target operating state of the power battery is a state of simultaneous heating and discharging and meets the heating stop condition, or if the current target operating state of the power battery is a state of simultaneous cooling and discharging and meets the cooling stop condition, then the target operating state of the power battery is determined to be the normal discharge state.

[0025] As an optional implementation method, the power battery of the target vehicle is initialized according to a preset high-voltage power-on procedure, including:

[0026] Perform power-on preprocessing operations;

[0027] Close the negative contactor, and after the first delay, close the pre-charge contactor to perform a pre-charge operation for a preset pre-charge duration on the power battery. Then close the positive contactor and after the second delay, disconnect the pre-charge relay.

[0028] The system sends pre-charge completion information and contactor status information via the bus, and after receiving a request signal from the target vehicle's power management system, it completes initialization and drives the power battery to discharge the target vehicle at high voltage.

[0029] Secondly, this application provides a vehicle discharge current control device, the device comprising:

[0030] The processing module is used to initialize the power battery of the target vehicle according to the preset high-voltage power-on procedure.

[0031] The acquisition module is used to acquire the operating parameters of the power battery;

[0032] The processing module is also used to determine the target operating state of the power battery based on the operating parameters.

[0033] The processing module is also used to adjust the current working state of the power battery to the target working state according to the preset thermal management process.

[0034] The processing module is also used to determine the lower limit current based on the target operating state, and to determine the discharge current of the power battery based on the lower limit current.

[0035] Among them, the discharge current is greater than or equal to the lower limit current, which includes the power system output current and the temperature control system output current. The power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state.

[0036] As an optional implementation, the target operating state includes a normal discharge state, a heating and discharging state, and a cooling and discharging state. The power system output current includes a first maximum output current, a second maximum output current, or a third maximum output current. The temperature control system output current includes a heating load current or a cooling load current.

[0037] The processing module determines the lower limit current based on the target operating state, and determines the specific method for determining the discharge current of the power battery based on the lower limit current, including:

[0038] If the target operating state is normal discharge state, the discharge current of the power battery is determined based on the first maximum output current.

[0039] If the target operating state is simultaneous heating and discharging, then the discharge current of the power battery is determined based on the heating load current and the second maximum output current.

[0040] If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery is determined based on the cooling load current and the third maximum output current.

[0041] Among them, the cooling load current is used to indicate the load condition of the cooling process, the heating load current is used to indicate the load condition of the heating process, and the first maximum output current, the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle and are used to indicate the load current of the high voltage discharge of the power battery under the corresponding target working state.

[0042] As an optional implementation, the operating parameters include the battery state of charge, minimum battery temperature, maximum battery temperature, and individual cell voltage. The processing module determines the specific method for the target operating state of the power battery based on these parameters, including:

[0043] Determine whether the operating parameters meet the heating conditions;

[0044] If it is determined that the working parameters meet the heating conditions, then the target working state of the power battery is determined to be a state of simultaneous heating and discharging.

[0045] If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

[0046] As an optional implementation, the operating parameters also include battery temperature difference, current discharge current and battery operating command, and the battery temperature difference is determined by the minimum battery temperature and the maximum battery temperature.

[0047] The processing module is also used for:

[0048] If it is determined that the operating parameters do not meet the heating conditions and do not meet the cooling conditions, or if the current target operating state of the power battery is a state of simultaneous heating and discharging and meets the heating stop condition, or if the current target operating state of the power battery is a state of simultaneous cooling and discharging and meets the cooling stop condition, then the target operating state of the power battery is determined to be the normal discharge state.

[0049] As an optional implementation, the specific method by which the processing module initializes the target vehicle's power battery according to a preset high-voltage power-on procedure includes:

[0050] Perform power-on preprocessing operations;

[0051] Close the negative contactor, and after the first delay, close the pre-charge contactor to perform a pre-charge operation for a preset pre-charge duration on the power battery. Then close the positive contactor and after the second delay, disconnect the pre-charge relay.

[0052] The system sends pre-charge completion information and contactor status information via the bus, and after receiving a request signal from the target vehicle's power management system, it completes initialization and drives the power battery to discharge the target vehicle at high voltage.

[0053] Thirdly, this application also provides an electronic device, comprising:

[0054] At least one processor; and

[0055] A memory that is communicatively connected to at least one processor; wherein,

[0056] The memory stores instructions that can be executed by at least one processor, such that the instructions are executed by at least one processor to enable the at least one processor to perform the method as described in the first aspect.

[0057] Fourthly, this application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the method as described in the first aspect.

[0058] The vehicle discharge current control method, device, electronic equipment, and storage medium provided in this application can determine the target operating state of the power battery by acquiring the initial operating parameters of the power battery. The target operating state can then be used to determine the lower limit current. Based on the specific operating state, the lower limit current can be used to control the magnitude of the vehicle discharge current according to the corresponding current determination method, the current driving state, and the target operating state. At the same time, according to the thermal management process, it can ensure that the discharge condition of the power battery is in a safe state. Thus, the flexibility and accuracy of vehicle discharge current control are improved, and the safety of the power battery during operation is also improved. Attached Figure Description

[0059] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0060] Figure 1 This is a schematic flowchart of a vehicle discharge current control method disclosed in an embodiment of the present invention;

[0061] Figure 2 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention;

[0062] Figure 3 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention;

[0063] Figure 4 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention;

[0064] Figure 5 This is a schematic diagram of the structure of a vehicle high-voltage discharge system disclosed in an embodiment of the present invention;

[0065] Figure 6 This is a schematic diagram of the structure of a vehicle discharge current control device disclosed in an embodiment of the present invention;

[0066] Figure 7 This is a schematic diagram of the structure of a vehicle discharge current control electronic device disclosed in an embodiment of the present invention;

[0067] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0068] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0069] Currently, in the technology of new energy vehicle power batteries, the battery management system is difficult to meet the requirements of users in various driving scenarios. Specifically, in low-temperature environments, when new energy vehicles are discharging while driving, due to the electrochemical characteristics of lithium-ion batteries and battery safety design, the battery system requests the activation of driving heating. However, after the heating device in the battery module is activated, it will cause a decrease in the discharge current rate and a reduction in vehicle power during driving, failing to meet the driving requirements in low-temperature environments and further affecting the driving experience. In high-temperature scenarios, it is also necessary to ensure that the power battery discharges under safe operating conditions.

[0070] To address the aforementioned issues, the discharge current can typically be adjusted. However, current vehicle discharge current control methods lack flexibility and accuracy in current adjustment, and these methods also reduce power supply efficiency. Therefore, a vehicle discharge current control method is needed to improve the flexibility and accuracy of vehicle discharge current control. This application primarily addresses the phenomenon of decreased battery discharge current rate and reduced vehicle power during driving caused by the battery module heating device being activated after the battery management system requests activation of the driving heater at low temperatures. It also considers the thermal management processes related to power battery discharge current control in both low-temperature and high-temperature operating scenarios. By developing a method for startup and temperature control in low-temperature environments, different allowable discharge current request strategies of the battery management system are executed based on the current detected temperature and individual cell voltage values ​​during driving, ensuring that the output current during driving meets the vehicle's power needs under different conditions.

[0071] Specifically, this application addresses different power consumption states of vehicles in low-temperature environments by adjusting the output current of the power battery's driving heating system based on the overall vehicle output power to ensure that the power consumption needs of vehicles in low-temperature environments are met: the maximum allowable output current of the power battery ≥ the required power output current of the vehicle + the output current of the battery pack when the driving heating system is activated.

[0072] Meanwhile, this application adjusts the driving heating mode for batteries operating at different temperatures and SOC thresholds in low-temperature environments: when T is at the first temperature threshold, the battery management system activates the simultaneous heating and discharging mode. After heating is activated, the reported allowable discharge current needs to be increased by the input current of the battery pack heating module; when T is at the second temperature threshold, the driving heating of the power battery is turned off.

[0073] Furthermore, this application adjusts the vehicle heating strategy based on the temperature collected by the battery management system temperature sensor under different driving heating environments. When T is at the third temperature threshold, the temperature management system is requested to turn on cooling. If T drops from the third temperature threshold to the second temperature threshold, the power battery driving cooling is turned off. This allows the power battery operating conditions and the required output current during driving to meet the vehicle's power needs under different conditions.

[0074] Therefore, the solution provided in this application adjusts the vehicle heating control strategy based on different temperature thresholds and individual cell voltage values ​​under low-temperature conditions. This protects the vehicle's normal starting in low-temperature environments and reduces the impact of the lithium iron phosphate battery's voltage plateau on the vehicle heating strategy based on the SOC value. Furthermore, it incorporates a control strategy for requesting the temperature management system to activate cooling during vehicle discharge based on the temperature value detected by the battery management system's temperature sensor under high-temperature conditions. This ensures that the power battery discharges within a safe temperature range under high-temperature conditions. On the other hand, this solution, for vehicle discharge in low-temperature environments, determines the vehicle heating shutdown conditions based on operating parameters such as the power battery module temperature, individual cell voltage value, and SOC value, preventing vehicle heating failures due to untimely shutdown of the power battery heating. Specific implementation methods and technical effects can be found in the relevant descriptions of each embodiment.

[0075] In summary, this application obtains the initial operating parameters of the power battery, thereby determining the target operating state of the power battery. The target operating state can then be used to determine the lower limit current. Furthermore, based on the specific operating state and the corresponding current determination method, as well as the current driving state and the target operating state, the magnitude of the vehicle's discharge current can be controlled through the lower limit current. Simultaneously, according to the thermal management process, it can ensure that the power battery's discharge condition is in a safe state. This improves the flexibility and accuracy of vehicle discharge current control and also enhances the safety of the power battery during operation.

[0076] Example 1

[0077] Please see Figure 1 , Figure 1 This is a schematic flowchart of a vehicle discharge current control method disclosed in an embodiment of the present invention. Figure 1 As shown, the method includes:

[0078] S101. Initialize the power battery of the target vehicle according to the preset high-voltage power-on procedure.

[0079] The high-voltage power-on process is determined based on the structure of the vehicle's power battery system and load system. The operating parameters and start-stop conditions can also be determined adaptably according to the specific application scenario. Example 2 provides the structure of a high-voltage discharge system, and also provides a corresponding process for high-voltage discharge during vehicle operation and specific parameter values. For details, please refer to the relevant descriptions in the corresponding locations.

[0080] S102. Obtain the operating parameters of the power battery;

[0081] The required operating parameters and the conditions for their values ​​can be determined based on the subsequent process for determining the target operating state of the power battery. In this application, the operating parameters may include parameters such as the minimum battery temperature, the battery state of charge, and the voltage value of individual battery cells, which are used to determine the corresponding conditions in the thermal management process. Then, based on the operating parameters, the current operating state of the power battery can be adjusted to the target operating state through a preset thermal management process.

[0082] S103. Determine the target operating state of the power battery based on the operating parameters;

[0083] S104. According to the preset thermal management process, adjust the current working state of the power battery to the target working state;

[0084] S105. Determine the lower limit current based on the target operating state, and determine the discharge current of the power battery based on the lower limit current.

[0085] In the process of determining the discharge current, the target operating state of the power battery is controlled through the thermal management process. The determined target operating state can be further used to determine the calculation method of the discharge current, thereby determining the discharge current. For details, please refer to the relevant description in Embodiment 2.

[0086] Among them, the discharge current is greater than or equal to the lower limit current, which includes the power system output current and the temperature control system output current. The power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state.

[0087] Therefore, from a practical physical perspective, the discharge current should be greater than or equal to the vehicle's required power output current during normal operation or driving, plus the relevant current for battery pack temperature control. The output current of the temperature control system can include the output current when the battery pack activates the vehicle heating or cooling function. In this case, the vehicle's required power output current during normal operation or driving, plus the relevant current for battery pack temperature control, can be considered as the aforementioned lower limit current. In some specific implementations, the minimum difference between the discharge current and the lower limit current can be further quantitatively determined based on the actual operating conditions as a redundancy current. This redundancy current ensures that the battery pack remains in normal operating condition throughout the entire operation, regardless of the discharge mode used. This reduces the complexity of repeated calculations and adjustments caused by switching target operating states, while also ensuring the safety of the battery pack.

[0088] This embodiment obtains the initial operating parameters of the power battery, thereby determining the target operating state of the power battery. The target operating state can then be used to determine the lower limit current. Based on the specific operating state, the current determination method can be adaptively used, along with the current driving state and the target operating state. The magnitude of the vehicle discharge current is controlled by the lower limit current. At the same time, according to the thermal management process, it can be ensured that the discharge condition of the power battery is in a safe state. Thus, the flexibility and accuracy of vehicle discharge current control are improved, and the safety of the power battery during operation is also enhanced.

[0089] Example 2

[0090] Please see Figure 2 , Figure 2 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention. Figure 2 As shown, the target operating states include normal discharge state, simultaneous heating and discharge state, and simultaneous cooling and discharge state. The power system output current includes a first maximum output current, a second maximum output current, or a third maximum output current. The temperature control system output current includes heating load current or cooling load current. The method includes:

[0091] S201. Initialize the power battery of the target vehicle according to the preset high-voltage power-on procedure.

[0092] S202. Obtain the operating parameters of the power battery;

[0093] S203. Determine the target operating state of the power battery based on the operating parameters;

[0094] S204. According to the preset thermal management process, adjust the current working state of the power battery to the target working state;

[0095] The descriptions of S201-S204 can be found in the corresponding descriptions in Embodiment 1, and will not be repeated here.

[0096] S205. If the target working state is normal discharge state, then determine the discharge current of the power battery based on the first maximum output current.

[0097] S206. If the target operating state is a state of simultaneous heating and discharging, then the discharge current of the power battery shall be determined based on the heating load current and the second maximum output current.

[0098] S207. If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery shall be determined based on the cooling load current and the third maximum output current.

[0099] Among them, the cooling load current is used to indicate the load condition of the cooling process, the heating load current is used to indicate the load condition of the heating process, and the first maximum output current, the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle and are used to indicate the load current of the high voltage discharge of the power battery under the corresponding target working state.

[0100] The determination of discharge current under the three states is a parallel scheme. However, the target operating state of the power battery can be reversibly or irreversibly changed during operation based on the process values ​​of the operating parameters. For example, under normal discharge state, heating can be activated when the operating parameters reach the preset heating start condition, thus switching the target operating state to a simultaneous heating and discharging state. When the operating parameters reach the preset heating stop condition, heating ends, and the target operating state is switched back to normal discharge state. Heating can then resume when the operating parameters reach the preset heating start condition. Conversely, if a heating fault occurs during heating, the target operating state is directly switched back to normal discharge state, but it cannot be switched back to the simultaneous heating and discharging state at this time. For specific implementation details, please refer to [link to relevant documentation]. Figure 3 , Figure 4 Descriptions of the two attached figures.

[0101] As an optional implementation, the operating parameters include the battery state of charge, minimum battery temperature, maximum battery temperature, and individual cell voltage. Based on these operating parameters, the target operating state of the power battery is determined, including:

[0102] Determine whether the operating parameters meet the heating conditions;

[0103] If it is determined that the working parameters meet the heating conditions, then the target working state of the power battery is determined to be a state of simultaneous heating and discharging.

[0104] If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

[0105] By analyzing the operating parameters, it can be determined whether the current power battery needs to be heated or cooled, and the corresponding thermal management process can be executed, enabling the power battery to operate under suitable conditions. This improves the flexibility and accuracy of vehicle discharge current control, and also enhances the safety of the power battery during operation.

[0106] As an optional implementation, the operating parameters also include battery temperature difference, current discharge current and battery operating command, and the battery temperature difference is determined by the minimum battery temperature and the maximum battery temperature.

[0107] The method also includes:

[0108] If it is determined that the operating parameters do not meet the heating conditions and do not meet the cooling conditions, or if the current target operating state of the power battery is a state of simultaneous heating and discharging and meets the heating stop condition, or if the current target operating state of the power battery is a state of simultaneous cooling and discharging and meets the cooling stop condition, then the target operating state of the power battery is determined to be the normal discharge state.

[0109] Among them, the heating conditions, heating stop conditions, cooling conditions, and cooling stop conditions can all be determined according to the specific application scenario, and are all related to the aforementioned working parameters. The specific parameters and values ​​selected may differ in the specific application scenario.

[0110] The heating and cooling stop conditions include not only the conditions where the operating parameters meet the preset values, but also the conditions where a fault occurs.

[0111] Taking the heating stop condition as an example, the first heating stop condition can be any of the following: ① the lowest battery temperature is greater than or equal to 10℃; ② the highest battery temperature is greater than 20℃; ③ the displayed SOC is less than 5%; ④ the main controller issues a high-voltage command; ⑤ the single cell voltage is less than 2.3V for 3 seconds and the lowest battery temperature is less than 0℃, or the single cell voltage is less than 2.7V for 3 seconds and the lowest battery temperature is greater than 0℃. The second heating stop condition can be a heating fault. Both heating stop conditions indicate that heating will stop and the target working state will switch from the heating and discharging state to the normal discharging state. However, the state switching process driven by the first heating stop condition is reversible, while the state switching process driven by the second heating stop condition is irreversible. In other words, if the target working state switches from the heating and discharging state to the normal discharging state driven by the second heating stop condition, the thermal management process will prevent the power battery heating process from being triggered again. The corresponding information can be sent to the preset terminal or alarmed with different signals, so that technicians or users can deal with the corresponding problems in a timely manner.

[0112] The operating parameters also allow for the determination of the conditions for stopping heating or cooling, enabling the power battery to remain in a normal discharge state without the need for temperature adjustment or after completing the relevant temperature adjustment process. This improves the flexibility and accuracy of vehicle discharge current control and enhances the safety of the power battery during operation.

[0113] The two aforementioned implementation methods can be based on Figure 3 The thermal management process will be implemented, and the parameter selection and specific conditions can be found in the relevant description below.

[0114] In one application scenario, please refer to Figure 3 , Figure 3 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention, used to illustrate the thermal management process provided in this application.

[0115] Here, TBD refers to a preset value that can be adjusted according to actual working conditions. Other related descriptions of TBD in this application have the same meaning and are all reference values ​​under the current working conditions, which will not be repeated hereafter.

[0116] like Figure 3 As shown, during normal driving, the power battery of a new energy vehicle is in a normal discharge state:

[0117] If the minimum temperature T is less than 5℃ (TBD) and the minimum single-cell voltage is greater than 3.1V, and the displayed SOC is greater than 15%, the battery management system will activate the driving discharge and heating mode. The maximum allowable discharge current of the battery management system needs to be increased by 12.5A (TBD) of heating current until the driving heating shutdown conditions are met (① minimum battery temperature greater than or equal to 10℃, TBD; ② maximum battery temperature greater than 20℃; ③ displayed SOC less than 5%; ④ main controller issues high voltage command; ⑤ single-cell voltage less than 2.3V for 3 seconds and minimum battery temperature less than 0℃, or single-cell voltage less than 2.7V for 3 seconds and minimum battery temperature greater than 0℃, TBD; driving heating shuts off if any of the conditions are met) and the battery management system does not report a heating fault, the driving heating function will be turned off and the vehicle will return to normal discharge mode.

[0118] If the minimum temperature is greater than 33℃ (TBD) or the maximum temperature is ≥38℃, the battery management system requests the temperature management system to activate cooling until the minimum temperature is ≤25℃ (TBD) and the maximum temperature is ≤30℃ (TBD). Then, the battery management system requests the temperature management system to deactivate the cooling function, and the power battery returns to normal discharge mode.

[0119] If the battery management system activates the vehicle heating function, and the conditions for shutting down the vehicle heating function are still not met after heating time t, the system checks whether the temperature management system reports a heating fault. If a vehicle heating fault is detected, the heating is shut off and restarting is prohibited. If no heating fault is detected, the battery management system enters a mode of discharging and heating while driving.

[0120] In addition, the conditions for activating the simultaneous heating and discharging mode can be subject to more stringent restrictions to ensure safety. Heating can only be activated and the simultaneous heating and discharging mode switched when all of these conditions are met simultaneously:

[0121] There are six limiting conditions for operating parameters: battery temperature difference less than 15℃ (TBD), power management system not issuing high voltage command, discharge current greater than 10A (TBD), minimum battery temperature less than or equal to 5℃ (TBD), displayed SOC greater than 15% (TBD), and battery cell voltage greater than 3.1V (TBD).

[0122] In one application scenario, please refer to Figure 4 , Figure 4 This is a schematic flowchart of another vehicle discharge current control method disclosed in an embodiment of the present invention, used to illustrate the current control process provided in this application. Figure 4 As shown, the specific process combining temperature control and output current control during vehicle operation can be as follows:

[0123] When the battery management system enters the normal driving discharge mode, it first detects the module temperature T. The battery management system then checks whether the temperature management system has reported a driving heating fault. If a heating fault is detected, the driving heating is turned off, and it is prohibited to turn on the driving heating again during operation.

[0124] When T is at the first temperature threshold T1, a request is made to start vehicle heating and enter the discharge-heating mode. The battery heating film, heater or liquid heat output current is I2. The battery management system determines the discharge current I3 according to the power meter. The battery management system allows the maximum output current I4 = I2 + I3. During normal vehicle discharge, the discharge current I1 ≤ I4.

[0125] When T is at the second temperature threshold T2, a request is made to start vehicle cooling and enter the discharge-cooling mode. The temperature management system input current is I2, the battery management system determines the discharge current I3 according to the power meter, and the battery management system allows a maximum output current I4 = I2 + I3. During normal vehicle discharge, the discharge current I1 ≤ I4.

[0126] As an optional implementation method, the power battery of the target vehicle is initialized according to a preset high-voltage power-on procedure, including:

[0127] Perform power-on preprocessing operations;

[0128] Close the negative contactor, and after the first delay, close the pre-charge contactor to perform a pre-charge operation for a preset pre-charge duration on the power battery. Then close the positive contactor and after the second delay, disconnect the pre-charge relay.

[0129] The system sends pre-charge completion information and contactor status information via the bus, and after receiving a request signal from the target vehicle's power management system, it completes initialization and drives the power battery to discharge the target vehicle at high voltage.

[0130] Through a preset high-voltage power-on process, the system interacts with the corresponding devices. After confirming that the high-voltage power-on is complete and receiving the request signal, the system completes the initialization process and drives the power battery to work normally, thereby ensuring the safety of the power battery during operation.

[0131] In one application scenario, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a vehicle high-voltage discharge system disclosed in an embodiment of the present invention. Figure 5As shown, in this implementation, when the vehicle is discharging in a low-temperature environment, the battery management system (BMS) receives the high-voltage power-on command from the main controller after a fault-free self-test. Once the high-voltage power-on is complete, the negative contactor closes first, and after a 100ms delay (TBD), the BMS closes the pre-charge contactor. After a 1s (TBD) pre-charge, the BMS closes the positive contactor. After a 100ms (TBD) delay, the BMS disconnects the pre-charge relay. The BMS then sends a high-voltage circuit working status and pre-charge completion information via the bus. Simultaneously, the BMS sends the main positive contactor status via the bus and receives a high-voltage power-on request from the vehicle power management system. The BMS then enters standby mode.

[0132] This embodiment determines the specific power battery discharge current by identifying specific target operating states such as normal discharge, simultaneous heating and discharge, and simultaneous cooling and discharge. The discharge current under the corresponding target operating state is determined based on the maximum output current, heating load current, or cooling load current. This allows the discharge current to be determined according to specific operating conditions, and the current determination method matches the corresponding target operating state. This improves the flexibility and accuracy of vehicle discharge current control and enhances the safety of the power battery during operation.

[0133] Example 3

[0134] This invention also provides a vehicle discharge current control device to implement the aforementioned method. Please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic diagram of the structure of a vehicle discharge current control device disclosed in an embodiment of the present invention. Figure 6 As shown, based on any other embodiment, the apparatus includes:

[0135] Processing module 31 is used to initialize the power battery of the target vehicle according to the preset high-voltage power-on procedure.

[0136] Module 32 is used to acquire the operating parameters of the power battery;

[0137] The processing module 31 is also used to determine the target operating state of the power battery based on the operating parameters.

[0138] The processing module 31 is also used to adjust the current working state of the power battery to the target working state according to the preset thermal management process;

[0139] The processing module 31 is also used to determine the lower limit current based on the target operating state, and to determine the discharge current of the power battery based on the lower limit current.

[0140] Among them, the discharge current is greater than or equal to the lower limit current, which includes the power system output current and the temperature control system output current. The power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state.

[0141] By acquiring the initial operating parameters of the power battery, the target operating state of the power battery can be determined. The target operating state can then be used to determine the lower limit current. Based on the specific operating state, the current can be determined adaptively according to the corresponding current determination method, as well as the current driving state and the target operating state. The magnitude of the vehicle's discharge current can be controlled by the lower limit current. At the same time, according to the thermal management process, it can be ensured that the discharge condition of the power battery is in a safe state. This improves the flexibility and accuracy of vehicle discharge current control and also enhances the safety of the power battery during operation.

[0142] As an optional implementation method,

[0143] The target operating states include normal discharge state, heating and discharging state and cooling and discharging state. The power system output current includes the first maximum output current, the second maximum output current or the third maximum output current. The temperature control system output current includes the heating load current or the cooling load current.

[0144] The processing module 31 determines the lower limit current based on the target operating state, and determines the specific method of the power battery discharge current based on the lower limit current, including:

[0145] If the target operating state is normal discharge state, the discharge current of the power battery is determined based on the first maximum output current.

[0146] If the target operating state is simultaneous heating and discharging, then the discharge current of the power battery is determined based on the heating load current and the second maximum output current.

[0147] If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery is determined based on the cooling load current and the third maximum output current.

[0148] Among them, the cooling load current is used to indicate the load condition of the cooling process, the heating load current is used to indicate the load condition of the heating process, and the first maximum output current, the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle and are used to indicate the load current of the high voltage discharge of the power battery under the corresponding target working state.

[0149] By identifying specific target operating states such as normal discharge, simultaneous heating and discharging, and simultaneous cooling and discharging, a specific method for determining the discharge current of the power battery can be established. The discharge current under the corresponding target operating state can be determined based on the maximum output current, heating load current, or cooling load current. This allows the discharge current to be determined according to specific operating conditions, and the current determination method matches the corresponding target operating state. As a result, the flexibility and accuracy of vehicle discharge current control are improved, as well as the safety of the power battery during operation.

[0150] As an optional implementation, the operating parameters include the battery state of charge, minimum battery temperature, maximum battery temperature, and individual battery cell voltage. The processing module 31 determines the specific method for determining the target operating state of the power battery based on these operating parameters, including:

[0151] Determine whether the operating parameters meet the heating conditions;

[0152] If it is determined that the working parameters meet the heating conditions, then the target working state of the power battery is determined to be a state of simultaneous heating and discharging.

[0153] If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

[0154] By analyzing the operating parameters, it can be determined whether the current power battery needs to be heated or cooled, and the corresponding thermal management process can be executed, enabling the power battery to operate under suitable conditions. This improves the flexibility and accuracy of vehicle discharge current control, and also enhances the safety of the power battery during operation.

[0155] As an optional implementation, the operating parameters also include battery temperature difference, current discharge current and battery operating command, and the battery temperature difference is determined by the minimum battery temperature and the maximum battery temperature.

[0156] Processing module 31 is also used for:

[0157] If it is determined that the operating parameters do not meet the heating conditions and do not meet the cooling conditions, or if the current target operating state of the power battery is a state of simultaneous heating and discharging and meets the heating stop condition, or if the current target operating state of the power battery is a state of simultaneous cooling and discharging and meets the cooling stop condition, then the target operating state of the power battery is determined to be the normal discharge state.

[0158] The operating parameters also allow for the determination of the conditions for stopping heating or cooling, enabling the power battery to remain in a normal discharge state without the need for temperature adjustment or after completing the relevant temperature adjustment process. This improves the flexibility and accuracy of vehicle discharge current control and enhances the safety of the power battery during operation.

[0159] As an optional implementation, the specific method by which the processing module 31 initializes the power battery of the target vehicle according to a preset high-voltage power-on procedure includes:

[0160] Perform power-on preprocessing operations;

[0161] Close the negative contactor, and after the first delay, close the pre-charge contactor to perform a pre-charge operation for a preset pre-charge duration on the power battery. Then close the positive contactor and after the second delay, disconnect the pre-charge relay.

[0162] The system sends pre-charge completion information and contactor status information via the bus, and after receiving a request signal from the target vehicle's power management system, it completes initialization and drives the power battery to discharge the target vehicle at high voltage.

[0163] Through a preset high-voltage power-on process, the system interacts with the corresponding devices. After confirming that the high-voltage power-on is complete and receiving the request signal, the system completes the initialization process and drives the power battery to work normally, thereby ensuring the safety of the power battery during operation.

[0164] Example 4

[0165] This application provides an electronic device, including:

[0166] At least one processor; and

[0167] A memory that is communicatively connected to at least one processor; wherein,

[0168] The memory stores instructions that can be executed by at least one processor to enable the at least one processor to perform the method as described in any of the embodiments.

[0169] This application provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, are used to implement the method as described in any of the embodiments.

[0170] For details, please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. For example... Figure 7 As shown, the electronic device may include:

[0171] The device includes a processor 291 and a memory 292 storing executable program code; it may also include a communication interface 293 and a bus 294. The processor 291, memory 292, and communication interface 293 can communicate with each other via the bus 294. The communication interface 293 can be used for information transmission. The processor 291 is coupled to the memory 292, and the processor 291 can call logical instructions (executable program code) in the memory 292 to execute the method of any of the above embodiments.

[0172] Furthermore, the logic instructions in the aforementioned memory 292 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0173] The memory 292, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this application. The processor 291 executes functional applications and data processing by running the software programs, instructions, and modules stored in the memory 292, thereby implementing the methods in the above-described method embodiments.

[0174] The memory 292 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 292 may include high-speed random access memory and may also include non-volatile memory.

[0175] This invention also provides a computer-readable storage medium storing computer-executable instructions, which, when invoked, are used to implement the method in any of the embodiments.

[0176] This invention also discloses a computer program product comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform the steps of the method described in any embodiment.

[0177] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0178] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0179] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0180] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for controlling vehicle discharge current, characterized in that, The method includes: The target vehicle's power battery is initialized according to the preset high-voltage power-on procedure. Obtain the operating parameters of the power battery; The target operating state of the power battery is determined based on the operating parameters; the operating parameters include the battery state of charge, the minimum battery temperature, the maximum battery temperature, and the individual cell voltage; the target operating state includes normal discharge state, simultaneous heating and discharging state, and simultaneous cooling and discharging state. According to the preset thermal management process, the current working state of the power battery is adjusted to the target working state; Based on the target operating state, a lower limit current is determined, and based on the lower limit current, the discharge current of the power battery is determined. Wherein, the discharge current is greater than or equal to the lower limit current, the lower limit current includes the power system output current and the temperature control system output current, the power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state; The step of determining a lower limit current based on the target operating state, and determining the discharge current of the power battery based on the lower limit current, includes: If the target operating state is a state of simultaneous heating and discharging, then the discharge current of the power battery is determined based on the heating load current and the second maximum output current. If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery is determined based on the cooling load current and the third maximum output current. The cooling load current is used to indicate the load condition during the cooling process, the heating load current is used to indicate the load condition during the heating process, and the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle to indicate the load current of the high-voltage discharge of the power battery under the corresponding target operating state.

2. The method according to claim 1, characterized in that, The power system output current includes a first maximum output current, a second maximum output current, or a third maximum output current; the temperature control system output current includes a heating load current or a cooling load current. The step of determining a lower limit current based on the target operating state, and determining the discharge current of the power battery based on the lower limit current, further includes: If the target operating state is a normal discharge state, then the discharge current of the power battery is determined based on the first maximum output current. The first maximum output current is determined by the battery management system of the target vehicle and is used to indicate the load current of the high-voltage discharge of the power battery under the corresponding target operating state.

3. The method according to claim 2, characterized in that, Determining the target operating state of the power battery based on the operating parameters includes: Determine whether the operating parameters meet the heating conditions; If it is determined that the operating parameters meet the heating conditions, then the target operating state of the power battery is determined to be a state of simultaneous heating and discharging. If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

4. The method according to claim 3, characterized in that, The operating parameters also include battery temperature difference, current discharge current and battery operating command, and the battery temperature difference is determined by the lowest battery temperature and the highest battery temperature; The method further includes: If it is determined that the operating parameters do not meet the heating conditions and do not meet the cooling conditions, or if the current target operating state of the power battery is a state of simultaneous heating and discharging and meets the heating stop condition, or if the current target operating state of the power battery is a state of simultaneous cooling and discharging and meets the cooling stop condition, then the target operating state of the power battery is determined to be a normal discharge state.

5. The method according to any one of claims 1-4, characterized in that, The initialization of the target vehicle's power battery according to the preset high-voltage power-on procedure includes: Perform power-on preprocessing operations; Close the negative contactor, and after a first delay, close the pre-charge contactor to perform a pre-charge operation for a preset pre-charge duration on the power battery. Then close the positive contactor and after a second delay, disconnect the pre-charge relay. The system sends pre-charge completion information and contactor status information via the bus, and upon receiving a request signal from the target vehicle's power management system, it completes initialization and drives the power battery to discharge the target vehicle at high voltage.

6. A vehicle discharge current control device, characterized in that, The device includes: The processing module is used to initialize the power battery of the target vehicle according to the preset high-voltage power-on procedure. The acquisition module is used to acquire the operating parameters of the power battery; The processing module is also used to determine the target operating state of the power battery based on the operating parameters; the operating parameters include the battery state of charge, the battery minimum temperature, the battery maximum temperature, and the battery cell voltage; the target operating state includes normal discharge state, simultaneous heating and discharging state, and simultaneous cooling and discharging state. The processing module is also used to adjust the current working state of the power battery to the target working state according to the preset thermal management process; The processing module is further configured to determine a lower limit current based on the target operating state, and to determine the discharge current of the power battery based on the lower limit current. Wherein, the discharge current is greater than or equal to the lower limit current, the lower limit current includes the power system output current and the temperature control system output current, the power system output current is used to indicate the output current that meets the output power corresponding to the current driving state of the target vehicle, and the temperature control system output current is used to indicate the output current corresponding to the process of the target vehicle adjusting the target working state; The processing module determines the lower limit current based on the target operating state, and determines the specific method of the discharge current of the power battery based on the lower limit current, including: If the target operating state is a state of simultaneous heating and discharging, then the discharge current of the power battery is determined based on the heating load current and the second maximum output current. If the target operating state is a state of simultaneous cooling and discharging, then the discharge current of the power battery is determined based on the cooling load current and the third maximum output current. The cooling load current is used to indicate the load condition during the cooling process, the heating load current is used to indicate the load condition during the heating process, and the second maximum output current and the third maximum output current are determined by the battery management system of the target vehicle to indicate the load current of the high-voltage discharge of the power battery under the corresponding target operating state.

7. The apparatus according to claim 6, characterized in that, The power system output current includes a first maximum output current, a second maximum output current, or a third maximum output current; the temperature control system output current includes a heating load current or a cooling load current. The processing module determines a lower limit current based on the target operating state, and determines the specific method for determining the discharge current of the power battery based on the lower limit current, further including: If the target operating state is a normal discharge state, then the discharge current of the power battery is determined based on the first maximum output current. The first maximum output current is determined by the battery management system of the target vehicle and is used to indicate the load current of the high-voltage discharge of the power battery under the corresponding target operating state.

8. The apparatus according to claim 7, characterized in that, The processing module determines the specific method of the target operating state of the power battery based on the operating parameters, including: Determine whether the operating parameters meet the heating conditions; If it is determined that the operating parameters meet the heating conditions, then the target operating state of the power battery is determined to be a state of simultaneous heating and discharging. If it is determined that the operating parameters do not meet the heating conditions, then it is determined whether the operating parameters meet the cooling conditions. If it is determined that the operating parameters meet the cooling conditions, then the target operating state of the power battery is determined to be a state of simultaneous cooling and discharging.

9. An electronic device, comprising: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method as described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-5.

Images