Battery system discharge power control method, device and equipment, medium and vehicle

Abstract

The embodiment of the invention discloses a battery system discharge power control method, device and equipment, a medium and a vehicle. The battery system comprises a plurality of battery cells. The method comprises the following steps: detecting the total voltage of the battery system and the voltage of the plurality of battery cells; under the condition that the total voltage meets a preset total voltage protection condition or the lowest voltage in the voltages of the multiple battery cells meets a preset battery cell under-voltage protection condition, the discharging power of the battery system is reduced, the total voltage protection condition is set according to the lower limit value of the working voltage of a target electric appliance in the vehicle, and the lowest voltage is set according to the lower limit value of the working voltage of the target electric appliance. The under-voltage protection condition of the battery cell is set according to the type of the battery cell. According to the embodiment of the invention, the discharge power can be reasonably limited when the under-voltage risk exists, so that the operation performance of the vehicle and the performance of the battery are considered.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a method, device, equipment, medium and vehicle for controlling the discharge power of a battery system. Background Art

[0002] To prevent irreversible damage to the battery caused by battery undervoltage and the risk of sudden power failure of the vehicle, an undervoltage protection strategy needs to be formulated in the power control strategy of the battery management system (BMS), and the discharge power of the battery system is restricted to prevent undervoltage.

[0003] When formulating the undervoltage protection strategy, how to limit the discharge power to balance the operating performance of the vehicle and the performance of the battery has become an urgent problem to be solved. Summary of the Invention

[0004] Embodiments of this application provide a method, device, equipment, computer storage medium and vehicle for controlling the discharge power of a battery system, which can reasonably limit the discharge power when there is a risk of undervoltage to balance the operating performance of the vehicle and the performance of the battery.

[0005] In a first aspect, embodiments of this application provide a method for controlling the discharge power of a battery system. The battery system includes multiple battery cells, and the method includes:

[0006] Detect the total voltage of the battery system and the voltages of multiple battery cells;

[0007] When the total voltage meets the preset total voltage protection condition, or the lowest voltage among the voltages of multiple battery cells meets the preset battery cell undervoltage protection condition, reduce the discharge power of the battery system, where the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle, and the battery cell undervoltage protection condition is set according to the type of the battery cell.

[0008] In an optional implementation, the preset total voltage protection condition includes multiple levels of total voltage protection conditions; the multiple levels include multiple levels corresponding to preset multiple total voltage thresholds respectively, the multiple total voltage thresholds include at least one total voltage pre-undervoltage threshold and a total voltage discharge cut-off threshold, and the total voltage pre-undervoltage threshold is greater than the total voltage discharge cut-off threshold;

[0009] When the total voltage meets the preset total voltage protection condition, reducing the discharge power of the battery system includes:

[0010] When the total voltage meets the preset total voltage protection condition, determine the target level of the total voltage protection condition corresponding to the total voltage;

[0011] According to the preset discharge power adjustment rule, determine the first target discharge power corresponding to the target level;

[0012] Reduce the discharge power of the battery system to a first target discharge power.

[0013] In an alternative embodiment, determining the first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes:

[0014] When the target level is the level corresponding to the total voltage pre-undervoltage threshold, determine the target power adjustment coefficient corresponding to the target level;

[0015] Calculate the product of the target power adjustment coefficient and the actual discharge power of the battery system to obtain the first target discharge power.

[0016] In an alternative embodiment, determining the first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes:

[0017] When the target level is the level corresponding to the total voltage pre-undervoltage threshold, calculate the target interpolation parameter corresponding to the target level according to the total voltage;

[0018] Interpolate between the preset lower limit power of vehicle driving and the actual discharge power of the battery system according to the target interpolation parameter through a preset interpolation algorithm to obtain the first target discharge power.

[0019] In an alternative embodiment, determining the first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes:

[0020] When the target level is the level corresponding to the total voltage discharge cut-off threshold, determine the preset lower limit power of vehicle driving as the first target discharge power.

[0021] In an alternative embodiment, when the lowest voltage among the voltages of multiple battery cells meets the preset battery cell under-voltage protection condition, reducing the discharge power of the battery system includes:

[0022] When the lowest voltage among the voltages of multiple battery cells meets the preset battery cell under-voltage protection condition, determine the second target discharge power corresponding to the lowest voltage based on a preset battery cell under-voltage protection strategy;

[0023] Reduce the discharge power of the battery system to the second target discharge power.

[0024] In a second aspect, an embodiment of the present application provides a battery system discharge power control device, including:

[0025] A battery system discharge power control device, characterized by including:

[0026] A detection module, configured to detect the total voltage of the battery system and the voltages of multiple battery cells;

[0027] A reduction module is used to reduce the discharge power of the battery system when the total voltage meets the preset total voltage protection condition or the lowest voltage among the voltages of multiple battery cells meets the preset battery cell undervoltage protection condition. The total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle, and the battery cell undervoltage protection condition is set according to the type of the battery cell.

[0028] In a third aspect, an embodiment of the present application provides an electronic device, which includes: a processor and a memory storing computer program instructions;

[0029] When the processor executes the computer program instructions, it implements the battery system discharge power control method according to any optional implementation manner of the first aspect of the present application.

[0030] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, they implement the battery system discharge power control method according to any optional implementation manner of the first aspect of the present application.

[0031] In a fifth aspect, an embodiment of the present application provides a vehicle, which includes: the battery system discharge power control device according to the second aspect or the electronic device according to the third aspect.

[0032] The battery system discharge power control method, device, equipment, computer storage medium and vehicle according to the embodiments of the present application can detect the total voltage of the battery system and the voltages of multiple battery cells, and reduce the discharge power of the battery system when the total voltage meets the preset total voltage protection condition or the lowest voltage among the voltages of multiple battery cells meets the preset battery cell undervoltage protection condition. In the embodiments of the present application, the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle. Judging whether to reduce the discharge power of the battery system according to the total voltage and the total voltage protection condition can timely reduce the discharge power of the battery system when there is a risk that the total voltage cannot maintain the normal operation of the target electrical appliance, so as to ensure the normal operation of the target electrical appliance and further reduce the risk of abnormal operation of the vehicle. In the embodiments of the present application, the battery cell undervoltage protection condition is set according to the type of the battery cell. Judging whether to reduce the discharge power of the battery system according to the lowest voltage of the battery cell and the battery cell undervoltage protection condition can timely reduce the discharge power of the battery system when there is a battery cell in the battery system that is about to have undervoltage, so as to reduce the risk of irreversible damage to the battery cell and further extend the performance of the battery. The embodiments of the present application decouple the total voltage protection condition and the battery cell undervoltage protection condition, and limit the discharge power respectively according to the needs of the normal operation of the vehicle and the safety of the battery cells. In this way, the operation performance of the vehicle and the performance of the battery can be taken into account. Description of the Drawings

[0033] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 is a schematic flowchart of a method for controlling the discharge power of a battery system provided by an embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of a device for controlling the discharge power of a battery system provided by another embodiment of the present application;

[0036] Figure 3 is a schematic structural diagram of an electronic device provided by yet another embodiment of the present application. Detailed Embodiments

[0037] The following will describe in detail the features and exemplary embodiments of various aspects of the present application. To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article, or device including the said elements.

[0039] As described in the background art, when formulating an undervoltage protection strategy, how to limit the discharge power to balance the running performance of the vehicle and the performance of the battery has become an urgent problem to be solved.

[0040] Based on this, the inventors have deeply considered and ingeniously designed a method, device, equipment, computer storage medium, and vehicle for controlling the discharge power of a battery system.

[0041] The battery system discharge power control method provided by the embodiments of the present application, and the device for executing this method can be a battery system discharge power control device, or some modules in the battery system discharge power control device for executing the battery system discharge power control method. In the embodiments of the present application, taking the battery system discharge power control device as an example to execute the battery system discharge power control method, the battery system discharge power control method provided by the embodiments of the present application will be described in detail.

[0042] Next, with reference to the accompanying drawings, the battery system discharge power control method provided by the embodiments of the present application will be introduced first.

[0043] Figure 1 FIG. shows a schematic flowchart of a battery system discharge power control method provided by an embodiment of the present application. The battery system includes a plurality of battery cells. As Figure 1 shown, the battery system discharge power control method may specifically include the following steps S110 to S120.

[0044] S110, detect the total voltage of the battery system and the voltages of a plurality of battery cells.

[0045] In step S110, the battery system may include a plurality of battery cells connected in series, and the total voltage may include the sum of the voltages of the plurality of battery cells connected in series. The battery system usually consists of a plurality of battery cells of the same type. When leaving the factory, the voltage consistency of the battery cells in the battery system is relatively high. However, with subsequent use, the voltage consistency difference of the battery cells in the battery system will increase, resulting in inconsistent times for the battery cells to reach the under-voltage state. In step S110, detecting the voltages of a plurality of battery cells may include detecting the actual voltage of each battery cell in the battery system in real time.

[0046] S120, when the total voltage meets the preset total voltage protection condition, or the lowest voltage among the voltages of a plurality of battery cells meets the preset battery cell under-voltage protection condition, reduce the discharge power of the battery system, where the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle, and the battery cell under-voltage protection condition is set according to the type of the battery cell.

[0047] In step S120, the target electrical appliance may include high-voltage electrical appliances in a vehicle, such as a drive motor, a compressor, a power module (such as a DC / DC module), etc. The operating voltage of the target electrical appliance may represent the voltage range within which the target electrical appliance can operate normally. There may be multiple target electrical appliances in the vehicle. When there are multiple target electrical appliances, the lower limit value of the operating voltage of the target electrical appliances may be the lower limit value of the voltage that can maintain all target electrical appliances operating normally. For example, among the multiple operating voltage ranges corresponding to the multiple target electrical appliances respectively, and the multiple lower limit values corresponding to the multiple operating voltage ranges, the highest lower limit value is the lower limit value of the operating voltage of the target electrical appliances. The type of the battery cell can be determined according to the electrode material used in the battery cell. As an example, when the positive electrode material used in the battery cell is a lithium iron phosphate-based positive electrode material, the type of the battery cell can be a lithium iron phosphate battery cell; when the positive electrode material used in the battery cell is a nickel cobalt manganese ternary positive electrode material or a nickel cobalt aluminum ternary positive electrode material, the type of the battery cell can be a ternary battery cell. The under-voltage protection condition of the battery cell can be set according to the discharge cut-off voltage threshold of the battery cell corresponding to the type of the battery cell. The discharge cut-off voltage threshold of the lithium iron phosphate battery cell is generally 2.0V, and the discharge cut-off voltage threshold of the ternary battery cell is generally 2.8V.

[0048] The total voltage of the battery system includes the sum of the voltages of multiple series-connected battery cells. If the consistency difference of the battery cell voltages in the battery system is not considered, the total voltage of the battery system can be equal to the product of the voltage of a single battery cell and the number of series-connected battery cells. Therefore, in the under-voltage protection strategy in the related art, generally, an under-voltage protection threshold corresponding to a single battery cell and an under-voltage protection threshold corresponding to the total voltage are set. Considering the quantitative relationship between the battery cell voltage and the total voltage, generally, the under-voltage protection threshold of the total voltage = the under-voltage protection threshold of the battery cell voltage * the number of series-connected battery cells.

[0049] The inventor has conducted in-depth research on the under-voltage protection strategy and found that based on the setting strategy of the under-voltage protection threshold of the total voltage and the under-voltage protection threshold of the battery cell in the related art, if irreversible damage to the battery cell is to be avoided, the under-voltage protection threshold of the battery cell can be set according to the intrinsic safety design requirements of the battery cell. However, due to the consistency difference of the battery cell voltages in the battery system, during operation, the total voltage of the battery system is always greater than the product of the lowest voltage of the battery cell and the number of battery cells in the system, resulting in the under-voltage protection threshold of the battery cell always reaching before the under-voltage protection threshold of the total voltage, and the under-voltage protection threshold of the total voltage is hardly triggered. If the operating performance of the vehicle is to be ensured, that is, the normal operation of the target electrical appliance is to be ensured, the under-voltage protection threshold of the total voltage can be set according to the operating voltage of the target electrical appliance. However, the under-voltage protection threshold of the battery cell corresponding to the under-voltage protection threshold of the total voltage set according to the operating voltage is usually higher than the under-voltage protection threshold of the battery cell set according to the intrinsic safety design requirements of the battery cell, thereby restricting the power and discharge capacity of the battery cell. As a result, it is difficult to balance the operating performance of the vehicle and the performance of the battery.

[0050] The battery system discharge power control method according to the embodiments of the present application can detect the total voltage of the battery system and the voltages of multiple battery cells. When the total voltage meets the preset total voltage protection condition, or the lowest voltage among the voltages of multiple battery cells meets the preset battery cell under-voltage protection condition, the discharge power of the battery system is reduced. In the embodiments of the present application, the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle. Judging whether to reduce the discharge power of the battery system according to the total voltage and the total voltage protection condition can timely reduce the discharge power of the battery system when there is a risk that the total voltage cannot maintain the normal operation of the target electrical appliance, so as to ensure the normal operation of the target electrical appliance, and further reduce the risk that the vehicle cannot operate normally. In the embodiments of the present application, the battery cell under-voltage protection condition is set according to the type of the battery cell. Judging whether to reduce the discharge power of the battery system according to the lowest voltage of the battery cell and the battery cell under-voltage protection condition can timely reduce the discharge power of the battery system when there is a battery cell in the battery system that is about to experience under-voltage, so as to reduce the risk of irreversible damage to the battery cell, and further extend the performance of the battery. The embodiments of the present application decouple the total voltage protection condition and the battery cell under-voltage protection condition, and limit the discharge power respectively according to the needs of the normal operation of the vehicle and the safety of the battery cells. In this way, the operating performance of the vehicle and the performance of the battery can be taken into account.

[0051] In one embodiment, the preset total voltage protection condition may include multiple levels of total voltage protection conditions; the multiple levels may include multiple levels corresponding to multiple preset total voltage thresholds respectively, and the multiple total voltage thresholds may include at least one total voltage pre-under-voltage threshold and a total voltage discharge cut-off threshold, and the total voltage pre-under-voltage threshold is greater than the total voltage discharge cut-off threshold.

[0052] When the total voltage meets the preset total voltage protection condition, reducing the discharge power of the battery system may specifically include:

[0053] When the total voltage meets the preset total voltage protection condition, determine the target level of the total voltage protection condition corresponding to the total voltage.

[0054] According to the preset discharge power adjustment rule, determine the first target discharge power corresponding to the target level.

[0055] Reduce the discharge power of the battery system to the first target discharge power.

[0056] The above total voltage discharge cut-off threshold may include a voltage value corresponding to the lower limit value of the operating voltage of the target electrical appliance. The total voltage pre-under-voltage threshold may be a voltage value determined based on the total voltage discharge cut-off threshold. The total voltage meeting the preset total voltage protection condition may include that the total voltage is lower than the maximum value of the total voltage pre-under-voltage threshold. In one embodiment, at least two levels of total voltage pre-under-voltage thresholds may be set above the total voltage discharge cut-off threshold. As an example, the total voltage discharge cut-off threshold may be represented by V0, a first-level total voltage pre-under-voltage threshold V1 = V0 + 10V may be set, and a second-level total voltage pre-under-voltage threshold V2 = V1 + 10V may be set. The above preset discharge power adjustment rule may include the correspondence between the level of the total voltage protection condition and the discharge power, or may include the correspondence between the level of the total voltage protection condition and the calculation rule of the discharge power, which is not limited herein.

[0057] In this embodiment, when the total voltage meets the preset total voltage protection condition, the target level of the total voltage protection condition corresponding to the total voltage may be determined, the corresponding first target discharge power may be determined according to the target level, and then the discharge power of the battery system may be reduced to the first target discharge power. In this way, during the process of the total voltage of the battery system decreasing, the total voltage protection conditions of each level can be triggered successively, so that the discharge power of the battery system is gradually limited to a smaller value. In this way, the discharge power of the battery system can be smoothly decreased, thereby reducing the impact of the sudden decrease in the discharge power on the vehicle occupants, and further improving the riding experience of the vehicle occupants.

[0058] In one embodiment, determining the first target discharge power corresponding to the target level according to the preset discharge power adjustment rule may specifically include:

[0059] When the target level is the level corresponding to the total voltage discharge cut-off threshold, the preset lower limit power for vehicle driving is determined as the first target discharge power. The lower limit power for vehicle driving may be the minimum power to maintain vehicle operation, for example, it may be the minimum power required for the vehicle to limp. In this embodiment, when the target level is the level corresponding to the total voltage discharge cut-off threshold, in other words, when the total voltage drops to the total voltage discharge cut-off threshold, the minimum power to maintain vehicle driving is determined as the first target discharge power. In this way, when the total voltage is about to be unable to maintain the normal operation of the target electrical appliance, the discharge power of the battery system can be reduced to the minimum power to maintain vehicle operation. In this way, the decrease in the total voltage of the battery system can be quickly and effectively suppressed, and the risk of the vehicle being unable to operate normally can be reduced.

[0060] In one embodiment, determining the first target discharge power corresponding to the target level according to the preset discharge power adjustment rule may specifically include:

[0061] When the target level is the level corresponding to the total voltage pre-under-voltage threshold, determine the target power adjustment coefficient corresponding to the target level.

[0062] Calculate the product of the target power adjustment coefficient and the actual discharge power of the battery system to obtain the first target discharge power.

[0063] In this embodiment, the corresponding relationship between the total voltage protection level and the power adjustment coefficient can be preset. As an example, the total voltage discharge cut-off threshold can be represented by V0. The first-level total voltage pre-under-voltage threshold V1 = V0 + 10V can be set, and the second-level total voltage pre-under-voltage threshold V2 = V1 + 10V can be set. When the target level is the level corresponding to the first-level total voltage pre-under-voltage threshold, the target power adjustment coefficient can be 0.75. When the target level is the level corresponding to the second-level total voltage pre-under-voltage threshold, the target power adjustment coefficient can be 0.5. Specifically, the lower limit power of vehicle driving can be the minimum power P required for the vehicle to limp min , and the actual discharge power of the current battery system can be denoted as P. The determination method of the first target discharge power can be as shown in Table 1 below.

[0064] Table 1

[0065] Target level First target discharge power <![CDATA[Level corresponding to V 2 > 0.75*P <![CDATA[Level corresponding to V 1 > 0.5*P <![CDATA[Level corresponding to V 0 > <![CDATA[P min >

[0066] In this embodiment, according to the target power adjustment coefficient corresponding to the target level, calculate the product of the target power adjustment coefficient and the actual discharge power of the battery system to obtain the first target discharge power. In this way, it is beneficial to the smooth decrease of the discharge power of the battery system, which helps to reduce the impact of the sudden decrease of the discharge power on the vehicle users, and thus can improve the riding experience of the vehicle users.

[0067] In one embodiment, according to the preset discharge power adjustment rule, determining the first target discharge power corresponding to the target level may specifically include:

[0068] When the target level is the level corresponding to the total voltage pre-under-voltage threshold, calculate the target interpolation parameter corresponding to the target level according to the total voltage.

[0069] Through the preset interpolation algorithm, interpolate between the preset lower limit power of vehicle driving and the actual discharge power of the battery system according to the target interpolation parameter to obtain the first target discharge power.

[0070] The above interpolation parameters may include the parameters required for performing the interpolation algorithm. For example, they may include the interpolation nodes for linear interpolation, etc. The interpolation algorithm may include interpolation algorithms known in the art, such as, but not limited to, linear interpolation and cubic spline interpolation, which are not limited herein. As an example, the total pressure discharge cut-off threshold may be represented by V0, and the total pressure pre-undervoltage threshold V3 = V0 + 20V may be set. When the current total voltage V of the battery system drops and triggers the total pressure pre-undervoltage threshold V3, the actual discharge power P1 of the battery system at the trigger moment is recorded. When the target level is the level corresponding to the total pressure pre-undervoltage threshold V3, that is, when the total voltage is lower than V3 and higher than V0, the difference parameter corresponding to the target level (V - V 0 ) / (V 4 - V 0 ) can be calculated according to the total voltage V, and interpolation is performed between P1 and the minimum power P min required for vehicle limp-home through the linear interpolation algorithm to obtain the first target discharge power. The determination method of the first target discharge power can be as shown in Table 2 below.

[0071] Table 2

[0072] Target level First target discharge power <![CDATA[Level corresponding to V 3 > <![CDATA[(V - V 0 ) / (V 4 - V 0 )*(P 1 - P min ) + P min > <![CDATA[Level corresponding to V 0 > <![CDATA[P min >

[0073] In this embodiment, the target interpolation parameter corresponding to the target level is calculated according to the current total voltage of the battery system, and interpolation is performed between the preset lower limit power for vehicle driving and the actual discharge power of the battery system according to the target interpolation parameter through the preset interpolation algorithm to obtain the first target discharge power. In this way, it is beneficial to the smooth decrease of the discharge power of the battery system, which helps to reduce the impact of the sudden decrease in discharge power on the vehicle users, and thus can improve the riding experience of the vehicle users.

[0074] In one embodiment, when the lowest voltage among the voltages of multiple battery cells meets the preset battery cell undervoltage protection condition, reducing the discharge power of the battery system may specifically include:

[0075] When the lowest voltage among the voltages of multiple battery cells meets the preset battery cell undervoltage protection condition, based on the preset battery cell undervoltage protection strategy, determine the second target discharge power corresponding to the lowest voltage.

[0076] Reduce the discharge power of the battery system to the second target discharge power.

[0077] The above-mentioned preset cell undervoltage protection strategy may include determining a second target discharge power corresponding to the lowest voltage based on the correspondence between the lowest voltage and the discharge power, or may include determining the second target discharge power based on the correspondence between the lowest voltage and the calculation rule of the discharge power, which is not limited herein. As an example, a multi-level cell pre-undervoltage protection strategy corresponding to multiple cell pre-undervoltage thresholds may be set above the cell discharge cut-off voltage. When the lowest voltage gradually triggers each level of the cell pre-undervoltage threshold during the decline process, the second target discharge power will be gradually limited to a smaller value, thereby realizing a smooth decline in the discharge power.

[0078] In the above embodiment, based on the preset cell undervoltage protection strategy, determining the second target discharge power corresponding to the lowest voltage and reducing the discharge power of the battery system to the second target discharge power can reduce the risk of irreversible damage to the cell.

[0079] In some embodiments, there may be a situation where the total voltage of the battery system meets the preset total voltage protection condition, and the lowest voltage among the voltages of multiple cells meets the preset cell undervoltage protection condition. After determining the first target discharge power corresponding to the target level and the second target discharge power corresponding to the lowest voltage, the method may further include: comparing the magnitudes of the first target discharge power and the second target discharge power; adjusting the discharge power of the battery system according to the smaller one of the first target discharge power and the second target discharge power.

[0080] Based on the same inventive concept, an embodiment of the present application further provides a device for controlling the discharge power of a battery system.

[0081] As Figure 2 shown, the device 200 for controlling the discharge power of a battery system may include a detection module 201 and a reduction module 202.

[0082] The detection module 201 is configured to detect the total voltage of the battery system and the voltages of multiple cells.

[0083] The reduction module 202 is configured to reduce the discharge power of the battery system when the total voltage meets the preset total voltage protection condition, or when the lowest voltage among the voltages of multiple cells meets the preset cell undervoltage protection condition, wherein the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle, and the cell undervoltage protection condition is set according to the type of the cell.

[0084] The battery system discharge power control device according to the embodiments of the present application can detect the total voltage of the battery system and the voltages of multiple battery cells. When the total voltage meets the preset total voltage protection condition, or the lowest voltage among the voltages of multiple battery cells meets the preset battery cell under-voltage protection condition, the discharge power of the battery system is reduced. In the embodiments of the present application, the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle. Judging whether to reduce the discharge power of the battery system according to the total voltage and the total voltage protection condition can timely reduce the discharge power of the battery system when there is a risk that the total voltage cannot maintain the normal operation of the target electrical appliance, so as to ensure the normal operation of the target electrical appliance and further reduce the risk that the vehicle cannot operate normally. In the embodiments of the present application, the battery cell under-voltage protection condition is set according to the type of the battery cell. Judging whether to reduce the discharge power of the battery system according to the lowest voltage of the battery cell and the battery cell under-voltage protection condition can timely reduce the discharge power of the battery system when there is a battery cell in the battery system that is about to have under-voltage, so as to reduce the risk of irreversible damage to the battery cell and further extend the performance of the battery. The embodiments of the present application decouple the total voltage protection condition and the battery cell under-voltage protection condition, and limit the discharge power respectively according to the needs of the normal operation of the vehicle and the safety of the battery cells. In this way, the operating performance of the vehicle and the performance of the battery can be taken into account.

[0085] In one embodiment, the preset total voltage protection condition may include multiple levels of total voltage protection conditions; the multiple levels may include multiple levels corresponding to multiple preset total voltage thresholds respectively, and the multiple total voltage thresholds may include at least one total voltage pre-under-voltage threshold and a total voltage discharge cut-off threshold, and the total voltage pre-under-voltage threshold is greater than the total voltage discharge cut-off threshold.

[0086] The reduction module is used to reduce the discharge power of the battery system when the total voltage meets the preset total voltage protection condition, and specifically may include:

[0087] The determination module is used to determine the target level of the total voltage protection condition corresponding to the total voltage when the total voltage meets the preset total voltage protection condition;

[0088] The determination module is used to determine the first target discharge power corresponding to the target level according to the preset discharge power adjustment rule.

[0089] The reduction module is used to reduce the discharge power of the battery system to the first target discharge power.

[0090] In one embodiment, the determination module is used to determine the first target discharge power corresponding to the target level according to the preset discharge power adjustment rule, and specifically may include:

[0091] The determination module is used to determine the target power adjustment coefficient corresponding to the target level when the target level is the level corresponding to the total voltage pre-under-voltage threshold.

[0092] A calculation module, configured to calculate the product of a target power adjustment coefficient and the actual discharge power of the battery system to obtain a first target discharge power.

[0093] In one embodiment, the determination module is configured to determine a first target discharge power corresponding to a target level according to a preset discharge power adjustment rule, and specifically may include:

[0094] A calculation module, configured to calculate a target interpolation parameter corresponding to the target level according to the total voltage when the target level is a level corresponding to a total voltage pre-undervoltage threshold.

[0095] An interpolation module, configured to interpolate between a preset lower limit power of vehicle driving and the actual discharge power of the battery system according to the target interpolation parameter through a preset interpolation algorithm to obtain a first target discharge power.

[0096] In one embodiment, the determination module is configured to determine a first target discharge power corresponding to a target level according to a preset discharge power adjustment rule, and specifically may include:

[0097] When the target level is a level corresponding to a total voltage discharge cut-off threshold, determine the preset lower limit power of vehicle driving as the first target discharge power.

[0098] In one embodiment, the reduction module is configured to reduce the discharge power of the battery system when the lowest voltage among the voltages of multiple battery cells meets a preset battery cell under-voltage protection condition, and specifically may include:

[0099] A determination module, configured to determine a second target discharge power corresponding to the lowest voltage based on a preset battery cell under-voltage protection strategy when the lowest voltage among the voltages of multiple battery cells meets the preset battery cell under-voltage protection condition.

[0100] The reduction module is configured to reduce the discharge power of the battery system to the second target discharge power.

[0101] The battery system discharge power control device provided by the embodiments of the present application can implement Figure 1 each process implemented by the method embodiments. To avoid repetition, details are not described herein again.

[0102] Figure 3 The schematic diagram of the hardware structure of the electronic device provided by the embodiments of the present application is shown.

[0103] The electronic device may include a processor 301 and a memory 302 storing computer program instructions.

[0104] Specifically, the above-mentioned processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured as one or more integrated circuits for implementing the embodiments of the present application.

[0105] The memory 302 may include a mass storage for data or instructions. By way of example and not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory 302 may include removable or non-removable (or fixed) media. In a suitable case, the memory 302 may be internal or external to the integrated gateway disaster recovery device. In a specific embodiment, the memory 302 is a non-volatile solid-state memory.

[0106] The memory may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described in reference to the method according to an aspect of the present application.

[0107] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement any one of the battery system discharge power control methods in the above embodiments.

[0108] As an example, the electronic device may further include a communication interface 303 and a bus 310. Among them, as Figure 3 shown, the processor 301, the memory 302, and the communication interface 303 are connected through the bus 310 to complete communication with each other.

[0109] The communication interface 303 is mainly used to implement communication between the various modules, devices, units, and / or devices in the embodiments of the present application.

[0110] The bus 310 includes hardware, software, or both, and couples the components of the online data flow metering device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, the bus 310 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0111] The electronic device can execute the battery system discharge power control method in the embodiments of the present application, so as to implement the combination of Figure 1 and Figure 2 the battery system discharge power control method and device described.

[0112] In addition, in combination with the battery system discharge power control method in the above embodiments, the embodiments of the present application can provide a computer storage medium to implement. Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by a processor, any one of the battery system discharge power control methods in the above embodiments is implemented.

[0113] Furthermore, in combination with the battery system discharge power control method in the above embodiments, the embodiments of the present invention can provide a vehicle to implement. The vehicle includes the battery system discharge power control device or the electronic device in the above embodiments.

[0114] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0115] The functional blocks shown in the above-described structural block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments for performing the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted over a transmission medium or communication link via a data signal carried in a carrier wave. A "machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0116] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be executed in the order mentioned in the embodiments, can be different from the order in the embodiments, or several steps can be executed simultaneously.

[0117] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each block in the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It should also be understood that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0118] As described above, this is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. A method for controlling the discharge power of a battery system, characterized in that, the battery system includes a plurality of battery cells, and the method includes: detecting the total voltage of the battery system and the voltages of the plurality of battery cells; when the total voltage meets a preset total voltage protection condition, or the lowest voltage among the voltages of the plurality of battery cells meets a preset battery cell under-voltage protection condition, reducing the discharge power of the battery system, wherein the total voltage protection condition is set according to the lower limit value of the operating voltage of a target electrical appliance in the vehicle, and the battery cell under-voltage protection condition is set according to the type of the battery cell.

2. The method according to claim 1, characterized in that, the preset total voltage protection condition includes multiple levels of total voltage protection conditions; the multiple levels include multiple levels corresponding to preset multiple total voltage thresholds respectively, the multiple total voltage thresholds include at least one total voltage pre-under-voltage threshold and a total voltage discharge cut-off threshold, and the total voltage pre-under-voltage threshold is greater than the total voltage discharge cut-off threshold; when the total voltage meets the preset total voltage protection condition, reducing the discharge power of the battery system includes: when the total voltage meets the preset total voltage protection condition, determining the target level of the total voltage protection condition corresponding to the total voltage; determining a first target discharge power corresponding to the target level according to a preset discharge power adjustment rule; reducing the discharge power of the battery system to the first target discharge power.

3. The method according to claim 2, characterized in that, determining a first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes: when the target level is the level corresponding to the total voltage pre-under-voltage threshold, determining a target power adjustment coefficient corresponding to the target level; calculating the product of the target power adjustment coefficient and the actual discharge power of the battery system to obtain the first target discharge power.

4. The method according to claim 2, characterized in that, determining a first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes: when the target level is the level corresponding to the total voltage pre-under-voltage threshold, calculating a target interpolation parameter corresponding to the target level according to the total voltage; interpolating between a preset lower limit power for vehicle driving and the actual discharge power of the battery system according to the target interpolation parameter through a preset interpolation algorithm to obtain the first target discharge power.

5. The method according to any one of claims 2-4, characterized in that, determining a first target discharge power corresponding to the target level according to a preset discharge power adjustment rule includes: when the target level is the level corresponding to the total voltage discharge cut-off threshold, determining the preset lower limit power for vehicle driving as the first target discharge power.

6. The method according to claim 1, characterized in that, when the lowest voltage among the voltages of the plurality of battery cells meets the preset battery cell under-voltage protection condition, reducing the discharge power of the battery system includes: When the lowest voltage among the voltages of the multiple battery cells meets the preset battery cell undervoltage protection condition, based on the preset battery cell undervoltage protection strategy, determine the second target discharge power corresponding to the lowest voltage; Reduce the discharge power of the battery system to the second target discharge power.

7. A device for controlling the discharge power of a battery system, Characterized in that, It includes: A detection module for detecting the total voltage of the battery system and the voltages of the multiple battery cells; A reduction module for reducing the discharge power of the battery system when the total voltage meets the preset total voltage protection condition or the lowest voltage among the voltages of the multiple battery cells meets the preset battery cell undervoltage protection condition, wherein the total voltage protection condition is set according to the lower limit value of the operating voltage of the target electrical appliance in the vehicle, and the battery cell undervoltage protection condition is set according to the type of the battery cell.

8. An electronic device, Characterized in that, The device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the battery system discharge power control method according to any one of claims 1-6.

9. A computer-readable storage medium, Characterized in that, Computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, they implement the battery system discharge power control method according to any one of claims 1-6.

10. A vehicle, Characterized in that, The vehicle includes: the device for controlling the discharge power of the battery system according to claim 7 or the electronic device according to claim 8.

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