Method and device for determining allowable power of battery, equipment and storage medium

Abstract

The invention discloses a method, device and equipment for determining the allowable power of a battery and a storage medium, and belongs to the technical field of battery management, and the method comprises the steps: determining the real electric quantity of the battery and the available electric quantity corresponding to the temperature of the battery; updating the display electric quantity based on a first difference value between the display electric quantity of the battery and the available electric quantity to obtain an updated display electric quantity; under the condition that the updated display electric quantity is larger than the available electric quantity, reference electric quantity is determined based on the updated display electric quantity and the real electric quantity, and the reference electric quantity is larger than the real electric quantity; an allowable power of the battery is determined based on the reference power. By comparing the updated display electric quantity with the available electric quantity considering the temperature factor, under the condition that the updated display electric quantity is greater than the available electric quantity, the allowable power of the battery is determined by using the reference electric quantity greater than the real electric quantity, so that higher allowable power can be obtained, and the risk of early breakdown of the vehicle under the condition that the vehicle is displayed to be electrified is further reduced.

Description

Technical Field

[0001] This application belongs to the field of battery management technology, and in particular relates to a method, apparatus, device and storage medium for determining the allowable power of a battery. Background Technology

[0002] State of Charge (SOC) is a core parameter that measures the ratio of a battery's remaining usable capacity to its capacity when fully charged. Electric vehicles typically employ two SOC schemes for power display and power control: displayed SOC is used to show the battery level on the vehicle's instrument panel, while the actual SOC indicates the battery's true state of charge.

[0003] In related technologies, the allowable battery power is typically determined by looking up a table using the actual State of Charge (SOC). If the actual SOC is close to 0, but the displayed SOC is greater than 0, the vehicle will actually show that it still has battery power, but the allowable battery power obtained from looking up the table based on the actual SOC will be 0, thus preventing the vehicle from driving.

[0004] Therefore, how to reduce the risk of vehicles breaking down prematurely when the power indicator shows that the vehicle has power is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The embodiments of this application provide a method, apparatus, device, and storage medium for determining the allowable power of a battery, thereby reducing, at least to some extent, the risk of a vehicle breaking down prematurely when the battery indicator shows that it has power.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a method for determining the allowable power of a battery is provided, applied to a vehicle, the vehicle including a battery, the method for determining the allowable power of the battery including:

[0008] Determine the battery's actual charge level and the available charge corresponding to the battery's temperature;

[0009] The displayed battery level is updated based on the first difference between the displayed battery level and the available battery level, resulting in an updated displayed battery level.

[0010] If the updated displayed battery level is greater than the available battery level, a reference battery level is determined based on the updated displayed battery level and the actual battery level, wherein the reference battery level is greater than the actual battery level.

[0011] The allowable power of the battery is determined based on the reference charge level.

[0012] In some embodiments, determining a reference battery level based on the updated displayed battery level and the actual battery level includes:

[0013] Determine and update the second difference between the displayed battery level and the available battery level;

[0014] Based on the difference between the updated displayed battery level and the actual battery level, and the second difference, the compensation battery level is determined;

[0015] The sum of the compensated power and the actual power is determined as the reference power.

[0016] In some embodiments, determining the compensation amount based on the difference between the updated displayed battery level and the actual battery level, and a second difference, includes:

[0017] If the updated displayed battery level is greater than the actual battery level, then a third difference between the updated displayed battery level and the actual battery level is determined;

[0018] The first compensation coefficient is determined based on the second difference and the updated displayed battery level; wherein the first compensation coefficient is greater than zero.

[0019] The compensation amount is determined based on the product of the third difference and the first compensation coefficient.

[0020] In some embodiments, determining the compensation amount based on the difference between the updated displayed battery level and the actual battery level, and a second difference, includes:

[0021] If the actual battery level is greater than the updated displayed battery level, then determine the fourth difference between the actual battery level and the updated displayed battery level;

[0022] The second compensation coefficient is determined based on the second difference and the updated displayed battery level; wherein the second compensation coefficient is greater than zero.

[0023] The compensation amount is determined based on the product of the fourth difference and the second compensation coefficient.

[0024] In some embodiments, determining the actual battery capacity and the available capacity corresponding to the battery temperature includes:

[0025] The first mapping table is used to find the battery's actual charge and the available charge corresponding to the battery's temperature; the first mapping table is used to represent the correspondence between the battery's actual charge and available charge at different temperatures.

[0026] In some embodiments, updating the displayed battery level based on a first difference between the displayed battery level and the available battery level to obtain an updated displayed battery level includes:

[0027] When the displayed battery level is greater than the available battery level, the displayed battery level is controlled to follow the change of available battery level at a first rate higher than the preset rate based on the first difference, so as to obtain an updated displayed battery level.

[0028] When the displayed battery level is less than the available battery level, the displayed battery level is controlled to change at a second rate lower than the preset rate according to the first difference, thereby updating the displayed battery level.

[0029] In some embodiments, determining the allowable power of the battery based on a reference charge level includes:

[0030] The allowable power of the battery is determined based on the reference charge and temperature.

[0031] In some embodiments, determining the allowable power of the battery based on a reference charge level and temperature includes:

[0032] The allowable power corresponding to the reference charge and temperature is found in the second mapping table; the second mapping table is used to characterize the correspondence between the battery's preset charge and allowable power at different temperatures.

[0033] In some embodiments, the method for determining the allowable power of the battery further includes:

[0034] If the displayed battery level is lower than the available battery level, the allowable power of the battery is determined based on the actual battery level.

[0035] In some embodiments, determining the allowable power of the battery based on the actual charge level includes:

[0036] The allowable power of the battery is determined based on the actual charge and temperature.

[0037] In some embodiments, determining the allowable power of the battery based on the actual charge level and temperature includes:

[0038] The allowable power corresponding to the actual charge and temperature is found in the second mapping table; the second mapping table is used to characterize the correspondence between the battery's preset charge and allowable power at different temperatures.

[0039] According to a second aspect of the embodiments of this application, a device for determining the allowable power of a battery is provided, applied to a vehicle, the vehicle including a battery, the device for determining the allowable power of the battery including:

[0040] The available power determination module is used to determine the actual power level of the battery and the available power level corresponding to the battery temperature.

[0041] The battery level update module is used to update the displayed battery level based on the first difference between the displayed battery level and the available battery level, so as to obtain the updated displayed battery level.

[0042] The reference power determination module is used to determine a reference power based on the updated displayed power and the actual power when the updated displayed power is greater than the available power, wherein the reference power is greater than the actual power.

[0043] The allowable power determination module is used to determine the allowable power of the battery based on a reference charge level.

[0044] According to a third aspect of the present application, a device for determining the allowable power of a battery is provided, including a processor and a memory, wherein the memory stores computer program instructions executable by the processor, and when the processor executes the computer program instructions, it implements the steps of the method as described in any of the first aspects above.

[0045] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided, which stores computer program instructions that, when executed by a processor, cause the processor to perform the steps of the method as described in any of the first aspects above.

[0046] According to a fifth aspect of the embodiments of this application, a computer program product is provided, including a computer program that, when executed by a processor, causes the processor to perform the steps of the method as described in any of the first aspects above.

[0047] In this application, considering that the actual battery level is not affected by temperature, while the displayed battery level is affected by temperature, a more accurate comparison result can be obtained by comparing the updated displayed battery level with the available battery level that takes temperature factors into account. Furthermore, when the updated displayed battery level is greater than the available battery level, this application uses a reference battery level that is greater than the actual battery level to determine the battery's allowable power, which can result in a greater allowable power, enabling the vehicle to drive normally and thus reducing the risk of the vehicle breaking down prematurely when the battery level is displayed as having power.

[0048] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0049] 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. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0050] Figure 1 A flowchart illustrating a method for determining the allowable power of a battery according to some embodiments of this application is shown.

[0051] Figure 2 A flowchart illustrating a method for determining the allowable power of a battery according to other embodiments of this application is shown.

[0052] Figure 3A block diagram of a device for determining the allowable power of a battery according to some embodiments of this application is shown;

[0053] Figure 4 A schematic diagram of a device for determining the allowable power of a battery according to some embodiments of this application is shown. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0056] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0057] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0058] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0059] To enable those skilled in the art to better understand this application, the application scenarios involved in this application will be briefly described first.

[0060] Electric vehicles typically employ two SOC (State of Charge) systems for battery level display and power control: displayed SOC and actual SOC. The displayed SOC is used to indicate the battery's charge level on the vehicle's instrument panel, while the actual SOC represents the battery's actual charge status. Related technologies often use a lookup table based on the actual SOC to determine the battery's allowable power. If the actual SOC is close to zero, but the displayed SOC is greater than zero, the vehicle will actually display that it still has charge, but the allowable power calculated from the lookup table based on the actual SOC will be zero, rendering the vehicle unable to move.

[0061] This application determines the battery's actual charge level and the available charge level corresponding to the battery's temperature; updates the displayed charge level based on a first difference between the displayed charge level and the available charge level to obtain an updated displayed charge level; if the updated displayed charge level is greater than the available charge level, a reference charge level is determined based on the updated displayed charge level and the actual charge level, wherein the reference charge level is greater than the actual charge level; and the allowable power of the battery is determined based on the reference charge level. This application considers that the actual charge level is not affected by temperature, while the displayed charge level is. By comparing the updated displayed charge level with the available charge level that takes temperature into account, a more accurate comparison result can be obtained. Furthermore, when the updated displayed charge level is greater than the available charge level, this application uses a reference charge level greater than the actual charge level to determine the allowable power of the battery, resulting in a higher allowable power level, enabling the vehicle to operate normally and thus reducing the risk of the vehicle breaking down prematurely when the displayed charge level is high.

[0062] It should be noted that the execution subject of the embodiments of this application can be the vehicle's battery management system, or other devices that communicate data with the battery management system. For example, this application can be implemented remotely via devices such as mobile phones, computers, and tablets. This application does not limit the implementation methods of other devices or the execution subject of each embodiment. The following uses the battery management system (BMS) as an example to describe the various embodiments of this application.

[0063] Figure 1 A flowchart illustrating a method for determining the allowable power of a battery according to some embodiments of this application is shown. Figure 1 As shown, a method for determining the allowable power of a battery is provided, which may include the following steps 101 to 104.

[0064] In step 101, the actual battery capacity and the available capacity corresponding to the battery temperature are determined.

[0065] Among them, the actual charge is used to characterize the state of charge of the battery obtained through calculation. Theoretically, the actual charge is close to the actual state of charge of the battery. The actual charge can be understood as equivalent to the actual state of charge of the battery. The usable charge represents the state of charge of the battery that can be used at the corresponding temperature.

[0066] Actual electricity consumption can be calculated using various formulas, but the industry commonly uses the ampere-hour integration method. For details, please refer to Formula 1 below:

[0067] SOC R =SOC0-(∫Idt / C) Formula 1;

[0068] Among them, SOC R The actual charge level is given by: SOC0 is the initial state of charge of the battery, i.e., the percentage of remaining charge at the start of the calculation (e.g., SOC0 = 100% indicates a fully charged state); ∫Idt is the integral of current I with respect to time t, in ampere-hours (Ah). The current is positive during discharge and negative during charging. The integral result represents the cumulative charge / discharge over a period of time; C is the rated capacity of the battery, in ampere-hours (Ah), i.e., the maximum amount of charge the battery can store under standard conditions.

[0069] As shown in Formula 1 above, the actual capacity of a battery is independent of its temperature. However, the usable capacity of a battery is affected by temperature; at high or low temperatures, the usable capacity will be less than the actual capacity. For example, when the actual capacity of a battery is 100%, the usable capacity may be 100% at room temperature, but only 95% at low temperatures. A battery management system can determine the usable capacity at a given temperature based on the actual capacity and the battery's temperature.

[0070] In some embodiments, determining the actual battery capacity and the available battery capacity corresponding to the battery temperature includes: looking up the actual battery capacity and the available battery capacity corresponding to the battery temperature in a first mapping table; wherein the first mapping table is used to characterize the correspondence between the actual battery capacity and the available battery capacity at different temperatures.

[0071] In the implementation process, the correspondence between the actual capacity and usable capacity of the battery at different temperatures can be pre-calibrated through experiments, simulations, and other methods to obtain the first mapping table. Specifically, batteries with different actual capacities can be placed at different temperatures for discharge experiments to obtain the corresponding usable capacity. Then, the actual capacity, temperature, and usable capacity can be mapped one-to-one to generate the first mapping table.

[0072] After obtaining the first mapping table, the battery management system can look up the table based on the battery's actual charge and temperature to obtain the corresponding available charge.

[0073] By looking up a table to determine the available power corresponding to the actual power level and temperature, the available power level can be determined quickly and accurately in a short time, thereby improving the efficiency of determining the battery's allowable power.

[0074] In step 102, the displayed battery level is updated based on the first difference between the displayed battery level and the available battery level to obtain the updated displayed battery level.

[0075] The displayed charge level indicates the state of charge shown by the vehicle's display device (such as the instrument panel). The displayed charge level changes with the available charge level. Since the available charge level is affected by temperature, the displayed charge level is also affected by temperature.

[0076] Specifically, when the available power decreases, the displayed power level will also decrease; when the available power increases, the displayed power level will also increase.

[0077] In some embodiments, updating the displayed battery level based on a first difference between the displayed battery level and the available battery level to obtain an updated displayed battery level includes: when the displayed battery level is greater than the available battery level, controlling the displayed battery level to follow the change of the available battery level at a first rate higher than a preset rate based on the first difference to obtain an updated displayed battery level; and when the displayed battery level is less than the available battery level, controlling the displayed battery level to follow the change of the available battery level at a second rate lower than a preset rate based on the first difference to obtain an updated displayed battery level.

[0078] The preset rate can be set according to the actual situation, such as one ampere-hour integral (i.e., 1C), or other rates. The specific value of the preset rate is not limited in the embodiments of this application.

[0079] Understandably, the battery's displayed charge level may be greater than or less than the available charge level. If the displayed charge level is greater than the available charge level during discharge, the battery management system can control the displayed charge level to catch up with the available charge level at a rate higher than one ampere-hour integral based on the first difference. Conversely, if the displayed charge level is lower than the available charge level, the battery management system can control the displayed charge level to catch up with the available charge level at a rate lower than one ampere-hour integral based on the first difference.

[0080] By using a higher rate to quickly bring the displayed battery level close to the available battery level when the displayed battery level is higher than the available battery level, the problem of falsely high displayed battery levels can be avoided.

[0081] In step 103, if the updated displayed battery level is greater than the available battery level, a reference battery level is determined based on the updated displayed battery level and the actual battery level, wherein the reference battery level is greater than the actual battery level.

[0082] It is understandable that the updated battery level may be greater than or less than the available battery level. If the battery's allowable power is still determined by the actual battery level when the updated battery level is greater than the available battery level, the updated battery level will still show that the battery has power, but the battery's allowable power is zero, and the vehicle will not be able to drive. Therefore, it is necessary to determine a reference battery level that is greater than the actual battery level based on the updated battery level and the actual battery level.

[0083] In some embodiments, determining a reference power level based on the updated displayed power level and the actual power level includes: determining a second difference between the updated displayed power level and the available power level; determining a compensation power level based on the difference information between the updated displayed power level and the actual power level, and the second difference; and determining the sum of the compensation power level and the actual power level as the reference power level.

[0084] The difference information may include a third difference between the updated displayed battery level and the actual battery level, or a fourth difference between the actual battery level and the updated displayed battery level.

[0085] It is understandable that the updated battery level may be greater than or less than the actual battery level. The battery management system can set different compensation levels based on these two situations, and then add the compensation level to the actual battery level to obtain a reference battery level that is greater than the actual battery level.

[0086] In some embodiments, determining the compensation amount based on the difference between the updated displayed power and the actual power, and a second difference, includes: if the updated displayed power is greater than the actual power, determining a third difference between the updated displayed power and the actual power; determining a first compensation coefficient based on the second difference and the updated displayed power; wherein the first compensation coefficient is greater than zero; and determining the compensation amount based on the product of the third difference and the first compensation coefficient.

[0087] It is understandable that since the updated displayed battery level is greater than the actual battery level, the third difference between the updated displayed battery level and the actual battery level is greater than zero, and the first compensation coefficient is also greater than zero. Therefore, the product of the third difference and the first compensation coefficient (i.e., the compensated battery level) is also greater than zero.

[0088] In the implementation process, the first compensation coefficient can be set by updating the displayed battery level and the second difference. For example, the first compensation coefficient can be set to 1 - SOC. D -2△SOC, then the reference charge can be calculated using the following formula:

[0089] SOC P =SOC R +(SOC D -SOC R )×(1-SOC D Formula 2 (-2△SOC);

[0090] Among them, SOC P For reference battery level, SOC R For actual battery capacity, SOC D To update the displayed battery level, SOC D -SOC R To update the displayed battery SOC D and actual SOC R The third difference between them, △SOC, is the updated displayed battery SOC. D and available power SOC T The second difference between them.

[0091] It should be noted that the first compensation coefficient can also be set to other values ​​based on the second difference and the updated displayed power. During the setting process, it is only necessary to ensure that the first compensation coefficient is greater than zero. This application embodiment does not impose any restrictions on the specific value of the first compensation coefficient.

[0092] In other embodiments, determining the compensation amount based on the difference between the updated displayed battery level and the actual battery level, and a second difference, includes: if the actual battery level is greater than the updated displayed battery level, determining a fourth difference between the actual battery level and the updated displayed battery level; determining a second compensation coefficient based on the second difference and the updated displayed battery level; wherein the second compensation coefficient is greater than zero; and determining the compensation amount based on the product of the fourth difference and the second compensation coefficient.

[0093] Understandably, if the actual battery level is greater than the updated displayed battery level, then the fourth difference between the actual battery level and the updated displayed battery level is greater than zero, and the second compensation coefficient is also greater than zero. Therefore, the product of the fourth difference and the second compensation coefficient (i.e., the compensated battery level) is also greater than zero.

[0094] In the implementation process, the second compensation coefficient can be determined using the second difference and the updated displayed battery level. For example, the second compensation coefficient can be set to SOC. D +2△SOC, then the reference charge can be calculated using the following formula three:

[0095] SOC P =SOC R +(SOC R- SOC D )×(SOC D Formula 3 (+2△SOC);

[0096] Among them, SOC P For reference battery level, SOC R For actual battery capacity, SOC D To update the displayed battery level, SOC R -SOC D True SOC (State of Charge) Rand update the displayed battery SOC D The fourth difference between them, △SOC is the updated displayed battery SOC. D and available power SOC T The second difference between them.

[0097] It should be noted that the second compensation coefficient can also be set to other values ​​based on the second difference and the updated displayed power. During the setting process, it is only necessary to ensure that the second compensation coefficient is greater than zero. This application embodiment does not impose any restrictions on the specific value of the second compensation coefficient.

[0098] The design of Formulas 2 and 3 ensures that the calculated reference battery level is always greater than the actual battery level, regardless of whether the updated displayed battery level is greater than or less than the actual battery level.

[0099] In step 104, the allowable power of the battery is determined based on the reference charge level.

[0100] The allowable power refers to the maximum power that the battery can continuously or briefly output under the premise of safety, reliability, and without impairing its lifespan.

[0101] After determining the allowable power of the battery, the battery management system can send the allowable power to the vehicle controller. After receiving the allowable power of the battery, the vehicle controller can control the power of the vehicle's high-voltage components according to the allowable power of the battery.

[0102] In some embodiments, considering that the allowable power is also affected by temperature, the battery management system can determine the allowable power of the battery based on a reference charge and temperature to obtain a more accurate allowable power.

[0103] In the implementation process, the allowable power of the battery is determined based on the reference charge and temperature, including: looking up the allowable power corresponding to the reference charge and temperature in the second mapping table; wherein, the second mapping table is used to characterize the correspondence between the preset charge and allowable power of the battery at different temperatures.

[0104] Specifically, the correspondence between the preset battery capacity and allowable power at different temperatures can be calibrated in advance through experiments, simulations, etc., to obtain a second mapping table. Specifically, the battery can be subjected to discharge experiments at different temperatures to obtain the current and voltage corresponding to the temperature and preset battery capacity. The allowable power is obtained by multiplying the current by the voltage, and then the temperature, preset battery capacity, and allowable power are mapped one-to-one to generate the second mapping table.

[0105] After obtaining the second mapping table, the battery management system can look up the table based on the reference charge and temperature to obtain the corresponding allowable power.

[0106] By looking up a table to determine the allowable power corresponding to the reference charge and temperature, the allowable power can be determined quickly and accurately in a short time, thereby improving the efficiency of determining the allowable power of the battery.

[0107] This application's embodiments determine the battery's actual charge level and the available charge level corresponding to the battery's temperature; based on a first difference between the displayed charge level and the available charge level, the displayed charge level is updated to obtain an updated displayed charge level; if the updated displayed charge level is greater than the available charge level, a reference charge level is determined based on the updated displayed charge level and the actual charge level, wherein the reference charge level is greater than the actual charge level; and the battery's allowable power is determined based on the reference charge level. This application considers that the actual charge level is not affected by temperature, while the displayed charge level is affected by temperature. By comparing the updated displayed charge level with the available charge level that takes temperature factors into account, a more accurate comparison result can be obtained. Furthermore, when the updated displayed charge level is greater than the available charge level, this application uses a reference charge level greater than the actual charge level to determine the battery's allowable power, resulting in a higher allowable power level, enabling the vehicle to drive normally and thus reducing the risk of the vehicle breaking down prematurely when the displayed charge level is high.

[0108] Figure 2 A flowchart illustrating a method for determining the allowable power of a battery according to other embodiments of this application is shown. Figure 2 As shown, another method for determining the allowable power of a battery is provided, which may include the following steps:

[0109] Step 201: Determine the actual battery capacity and the available capacity corresponding to the battery temperature;

[0110] Step 202: Based on the first difference between the displayed battery level and the available battery level, update the displayed battery level to obtain the updated displayed battery level;

[0111] Step 203: If the updated displayed battery level is greater than the available battery level, determine a reference battery level based on the updated displayed battery level and the actual battery level, wherein the reference battery level is greater than the actual battery level.

[0112] Step 204: Determine the allowable power of the battery based on the reference charge level;

[0113] Step 205: If the updated displayed battery level is less than the available battery level, determine the battery's allowable power based on the actual battery level.

[0114] The specific implementation of steps 201 to 204 can refer to steps 101 to 104 in the above embodiments, and will not be repeated here. Step 205 defines how to determine the allowable power of the battery when the updated displayed power is less than the available power.

[0115] It is understandable that when the updated battery level is lower than the available battery level, the updated battery level will also be lower than the actual battery level because the available battery level is lower than the actual battery level. The allowable power determined based on the actual battery level can maintain the vehicle's normal operation until the updated battery level reaches zero, preventing the vehicle from breaking down prematurely despite showing that it has power.

[0116] In some embodiments, considering that the allowable power is also affected by temperature, the battery management system can determine the allowable power of the battery based on the actual charge and temperature to obtain a more accurate allowable power.

[0117] In the implementation process, the allowable power of the battery is determined based on the actual charge and temperature, including: looking up the allowable power corresponding to the actual charge and temperature in the second mapping table; wherein, the second mapping table is used to characterize the correspondence between the preset charge and allowable power of the battery at different temperatures.

[0118] Specifically, the correspondence between the preset battery capacity and allowable power at different temperatures can be calibrated in advance through experiments, simulations, etc., to obtain a second mapping table. Specifically, the battery can be subjected to discharge experiments at different temperatures to obtain the current and voltage corresponding to the temperature and preset battery capacity. The allowable power is obtained by multiplying the current by the voltage, and then the temperature, preset battery capacity, and allowable power are mapped one-to-one to generate the second mapping table.

[0119] After obtaining the second mapping table, the battery management system can look up the table based on the actual charge and temperature to obtain the corresponding allowable power.

[0120] By looking up a table to determine the allowable power corresponding to the actual charge and temperature, the allowable power can be determined quickly and accurately in a short time, thereby improving the efficiency of determining the battery's allowable power.

[0121] This embodiment of the application takes into account that the displayed battery level is affected by temperature, while the actual battery level is not. It uses the actual battery level and temperature to determine the available battery level, then updates the displayed battery level using the available battery level. Next, it compares the updated displayed battery level with the available battery level to determine if the updated displayed battery level is too high. If the updated displayed battery level is not too high, the battery's allowable power is determined using the actual battery level; if the updated displayed battery level is too high, a reference battery level greater than the actual battery level is used to determine the battery's allowable power, thus obtaining a greater allowable power and effectively preventing vehicle breakdowns.

[0122] The following describes an embodiment of the apparatus described in this application, which can be used to execute the method for determining the allowable power of a battery in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method for determining the allowable power of a battery described above in this application.

[0123] See Figure 3The diagram shows a block diagram of a device for determining the allowable power of a battery according to an embodiment of this application.

[0124] like Figure 3 As shown, the allowable power determination device for a battery according to an embodiment of this application is applied to a vehicle. The vehicle includes a battery, and the allowable power determination device includes: an available power determination module 301, a display power update module 302, a reference power determination module 303, and an allowable power determination module 304. The available power determination module 301 is used to determine the actual power of the battery and the available power corresponding to the battery temperature. The display power update module 302 is used to update the display power based on a first difference between the displayed power and the available power to obtain an updated display power. The reference power determination module 303 is used to determine a reference power based on the updated display power and the actual power when the updated display power is greater than the available power, wherein the reference power is greater than the actual power. The allowable power determination module 304 is used to determine the allowable power of the battery based on the reference power.

[0125] In some embodiments, based on the foregoing scheme, the reference power determination module 303 is further configured to determine a second difference between the updated displayed power and the available power; determine a compensation power based on the difference information between the updated displayed power and the actual power, and the second difference; and determine the sum of the compensation power and the actual power as the reference power.

[0126] In some embodiments, based on the foregoing scheme, the reference power determination module 303 is further configured to: determine a third difference between the updated displayed power and the actual power if the updated displayed power is greater than the actual power; determine a first compensation coefficient based on the second difference and the updated displayed power; wherein the first compensation coefficient is greater than zero; and determine the compensation power based on the product between the third difference and the first compensation coefficient.

[0127] In some embodiments, based on the foregoing scheme, the reference power determination module 303 is further configured to: determine a fourth difference between the actual power and the updated displayed power if the actual power is greater than the updated displayed power; determine a second compensation coefficient based on the second difference and the updated displayed power; wherein the second compensation coefficient is greater than zero; and determine the compensation power based on the product of the fourth difference and the second compensation coefficient.

[0128] In some embodiments, based on the foregoing scheme, the available power determination module 301 is further configured to look up the actual power of the battery and the available power corresponding to the battery temperature in the first mapping table; wherein, the first mapping table is used to characterize the correspondence between the actual power of the battery and the available power at different temperatures.

[0129] In some embodiments, based on the foregoing scheme, the battery power update module 302 is further configured to, when the battery power displayed is greater than the available power, control the displayed power to follow the change of the available power at a first rate higher than a preset rate according to a first difference, to obtain an updated displayed power; and when the battery power displayed is less than the available power, control the displayed power to follow the change of the available power at a second rate lower than a preset rate according to a first difference, to obtain an updated displayed power.

[0130] In some embodiments, based on the foregoing scheme, the allowable power determination module 304 is further configured to determine the allowable power of the battery based on a reference charge and temperature.

[0131] In some embodiments, based on the foregoing scheme, the allowable power determination module 304 is further configured to look up the allowable power corresponding to the reference charge and temperature in the second mapping table; wherein, the second mapping table is used to characterize the correspondence between the preset charge and allowable power of the battery at different temperatures.

[0132] In some embodiments, based on the foregoing scheme, the allowable power determination module 304 is further configured to determine the allowable power of the battery based on the actual battery level when the updated displayed battery level is less than the available battery level.

[0133] In some embodiments, based on the foregoing scheme, the allowable power determination module 304 is further configured to determine the allowable power of the battery based on the actual charge and temperature.

[0134] In some embodiments, based on the foregoing scheme, the allowable power determination module 304 is further configured to look up the allowable power corresponding to the actual charge and temperature in the second mapping table; wherein, the second mapping table is used to characterize the correspondence between the preset charge and allowable power of the battery at different temperatures.

[0135] Based on the same inventive concept, embodiments of this application also provide a device for determining the allowable power of a battery, see reference. Figure 4 The diagram shows a schematic of the structure of a device for determining the allowable power of a battery according to an embodiment of this application. The device for determining the allowable power of a battery includes one or more memories 404, one or more processors 402, and at least one computer program (computer program instructions) stored in the memory 404 and executable on the processor 402. When the processor 402 executes the computer program, it implements the method described above.

[0136] Among them, Figure 4In this document, a bus architecture (represented by bus 400) is used. Bus 400 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 can be used to store data used by processor 402 during operation.

[0137] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, cause the processor to perform the steps of the method described above.

[0138] Based on the same inventive concept, embodiments of this application provide a computer program product, including a computer program, which, when executed by a processor, causes the processor to perform the steps of the method described above.

[0139] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0140] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0141] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0142] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing computer program instructions, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0143] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining the allowable power of a battery, characterized in that, Applied to a vehicle, the vehicle including a battery, the method includes: Determine the actual charge level of the battery and the available charge level corresponding to the battery's temperature; Based on the first difference between the displayed battery level and the available battery level, the displayed battery level is updated to obtain the updated displayed battery level; If the updated displayed battery level is greater than the available battery level, a reference battery level is determined based on the updated displayed battery level and the actual battery level, wherein the reference battery level is greater than the actual battery level. The allowable power of the battery is determined based on the reference charge level.

2. The method for determining the allowable power of a battery according to claim 1, characterized in that, The step of determining the reference battery level based on the updated displayed battery level and the actual battery level includes: Determine a second difference between the updated displayed battery level and the available battery level; Based on the difference information between the updated displayed battery level and the actual battery level, and the second difference, the compensation battery level is determined; The sum of the compensated power and the actual power is determined as the reference power.

3. The method for determining the allowable power of a battery according to claim 2, characterized in that, The step of determining the compensation power based on the difference information between the updated displayed power and the actual power, and the second difference, includes: If the updated displayed battery level is greater than the actual battery level, then a third difference between the updated displayed battery level and the actual battery level is determined; A first compensation coefficient is determined based on the second difference and the updated displayed battery level; wherein the first compensation coefficient is greater than zero; The compensation power is determined based on the product of the third difference and the first compensation coefficient.

4. The method for determining the allowable power of a battery according to claim 2, characterized in that, The step of determining the compensation power based on the difference information between the updated displayed power and the actual power, and the second difference, includes: If the actual battery level is greater than the updated displayed battery level, then a fourth difference between the actual battery level and the updated displayed battery level is determined; A second compensation coefficient is determined based on the second difference and the updated displayed battery level; wherein the second compensation coefficient is greater than zero; The compensation power is determined based on the product of the fourth difference and the second compensation coefficient.

5. The method for determining the allowable power of a battery according to any one of claims 1 to 4, characterized in that, Determining the actual charge level of the battery and the available charge level corresponding to the battery temperature includes: The first mapping table is used to find the actual charge of the battery and the available charge corresponding to the temperature of the battery; wherein, the first mapping table is used to represent the correspondence between the actual charge and the available charge of the battery at different temperatures.

6. The method for determining the allowable power of a battery according to any one of claims 1 to 4, characterized in that, The process of updating the displayed battery level based on a first difference between the displayed battery level and the available battery level to obtain an updated displayed battery level includes: When the displayed battery level is greater than the available battery level, the displayed battery level is controlled to follow the change of the available battery level at a first rate higher than a preset rate based on the first difference, thereby obtaining the updated displayed battery level. When the displayed battery level is less than the available battery level, the displayed battery level is controlled to follow the change of the available battery level at a second rate lower than the preset rate based on the first difference, so as to obtain the updated displayed battery level.

7. The method for determining the allowable power of a battery according to any one of claims 1 to 4, characterized in that, Determining the allowable power of the battery based on the reference charge level includes: The allowable power of the battery is determined based on the reference charge and the temperature.

8. The method for determining the allowable power of a battery according to claim 7, characterized in that, Determining the allowable power of the battery based on the reference charge and the temperature includes: The reference charge and the allowable power corresponding to the temperature are looked up in the second mapping table; wherein, the second mapping table is used to characterize the correspondence between the preset charge and the allowable power of the battery at different temperatures.

9. The method for determining the allowable power of a battery according to any one of claims 1 to 4, characterized in that, Also includes: If the updated displayed battery level is less than the available battery level, the allowable power of the battery is determined based on the actual battery level.

10. The method for determining the allowable power of a battery according to claim 9, characterized in that, Determining the allowable power of the battery based on the actual charge level includes: Based on the actual charge level and the temperature, the allowable power of the battery is determined.

11. The method for determining the allowable power of a battery according to claim 10, characterized in that, Determining the allowable power of the battery based on the actual charge level and the temperature includes: The second mapping table is used to look up the actual charge and the allowable power corresponding to the temperature; wherein, the second mapping table is used to characterize the correspondence between the preset charge and allowable power of the battery at different temperatures.

12. A device for determining the allowable power of a battery, characterized in that, Applied to a vehicle, the vehicle including a battery, the device includes: A usable power determination module is used to determine the actual power of the battery and the usable power corresponding to the temperature of the battery. The battery level update module is used to update the displayed battery level based on a first difference between the displayed battery level and the available battery level, so as to obtain the updated displayed battery level. A reference power determination module is used to determine a reference power based on the updated displayed power and the actual power when the updated displayed power is greater than the available power, wherein the reference power is greater than the actual power. The allowable power determination module is used to determine the allowable power of the battery based on the reference charge level.

13. A device for determining the allowable power of a battery, comprising a processor and a memory, characterized in that, The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, it implements the steps of the method as described in any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, cause the processor to perform the steps of the method as described in any one of claims 1 to 11.

15. A computer program product, characterized in that, It includes a computer program, which, when executed by a processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 11.

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