Method for Determining Depth of Charge and Discharge of Battery, Battery Management System, Device and Equipment

Abstract

The present application discloses a method for determining the charge and discharge depth of a battery, a battery management system, a device and equipment. The method includes: obtaining at least one historical driving condition of a vehicle and vehicle usage data under each historical driving condition, where the vehicle usage data includes the driving distance of the vehicle and the battery power consumption; for each historical driving condition, determining the charge and discharge depth of the battery according to the driving distance and the battery power consumption under the historical driving condition; determining a target charge and discharge interval of the battery according to the charge and discharge depth of the battery; and controlling the battery to charge and discharge within the target charge and discharge interval when the battery is charging and discharging. Through the solution provided by the present application, the service life of the battery can be improved while taking into account the battery endurance.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a method for determining the charge and discharge depth of a battery, a battery management system, a device, and equipment. Background Art

[0002] The charge and discharge depth of a battery affects the service life of the battery. A too deep discharge depth of the battery can improve the battery life, but will reduce the service life of the battery. A too shallow discharge depth of the battery can improve the service life of the battery, but will reduce the battery life.

[0003] Therefore, how to determine the charge and discharge depth of a battery is of great significance for balancing the battery life while improving the battery life. Summary of the Invention

[0004] The present application provides a method for determining the charge and discharge depth of a battery, a battery management system, a device, and equipment, which can improve the battery life while balancing the battery life.

[0005] In a first aspect, the present application provides a method for determining the charge and discharge depth of a battery. The method includes: obtaining the historical working conditions of a vehicle in a historical period and the vehicle usage data under each historical working condition, where the vehicle usage data includes the driving distance of the vehicle and the battery power consumption; for each historical working condition, determining the historical working condition type of the historical working condition according to the driving distance and the battery power consumption under the historical working condition; determining the charge and discharge depth of the battery according to the historical working condition type; determining the target charge and discharge interval of the battery according to the charge and discharge depth of the battery; and controlling the battery to charge and discharge within the target charge and discharge interval when the battery is charging and discharging.

[0006] As can be seen from the above, in the embodiments of the present application, the vehicle usage data under the historical working conditions of the vehicle can reflect the usage habits of the user using the vehicle. The charge and discharge depth of the battery in the historical charge and discharge process can be determined through the battery power consumption under the vehicle usage data, and the charge and discharge depth in the historical charge and discharge process can reflect the usage requirements of the user for the vehicle. Therefore, by adjusting the charge and discharge depth of the battery based on the vehicle usage data under the historical working conditions and performing charge and discharge operations on the battery through the adjusted charge and discharge depth, the battery life can be kept within a reasonable range and the usage requirements of the user for the vehicle can be met. In addition, in the embodiments of the present application, by determining the charge and discharge depth of the battery according to the driving distance and the battery power consumption under the historical working conditions, the charge and discharge depth of the battery can be kept within a reasonable range, and then the charge and discharge of the battery can be controlled within the charge and discharge interval corresponding to the charge and discharge depth, which can improve the service life of the battery. By restricting the charge and discharge interval of the battery charging, the charge and discharge SOC of the battery can be kept within a reasonable interval range for a long time, and the service life of the battery can be improved without affecting the user experience of using the vehicle.

[0007] It can be seen that the solution provided by the embodiments of the present application can improve the battery service life while taking into account the battery endurance.

[0008] In some embodiments, obtaining the historical driving conditions of the vehicle within a historical period and the vehicle usage data under each historical driving condition includes: obtaining the historical usage data of the vehicle within the historical period, where the historical usage data includes the start driving time, end driving time, driving distance, and battery power consumption during the driving process of the vehicle; determining at least one historical driving condition of the vehicle within the historical period according to the start driving time and the end driving time; and determining the vehicle usage data under each historical driving condition according to the driving distance within the historical period and the battery power consumption during the driving process.

[0009] Determining the historical driving conditions of the vehicle and the vehicle usage data according to the historical usage data of the vehicle within the historical period, and then determining the charge-discharge depth of the battery according to the historical driving conditions of the vehicle, can make the charge-discharge depth of the battery within a reasonable range, and then control the charge and discharge of the battery within the charge-discharge interval corresponding to the charge-discharge depth, which can improve the battery service life.

[0010] In some embodiments, for each historical driving condition, determining the charge-discharge depth of the battery according to the driving distance and the battery power consumption under the historical driving condition includes: for each historical driving condition, determining the historical driving condition type of the historical driving condition according to the driving distance and the battery power consumption under the historical driving condition; and determining the charge-discharge depth of the battery according to the historical driving condition type.

[0011] Using the charge-discharge depth determination method corresponding to the historical driving condition type to determine the charge-discharge depth of the battery can make the determination of the charge-discharge depth of the battery more reasonable, meet the user's usage requirements for the vehicle, and at the same time make the charge and discharge of the battery within a reasonable range, improving the battery service life while taking into account the battery endurance.

[0012] In some embodiments, the historical driving condition type includes a first type and / or a second type. Determining the historical driving condition type of the historical driving condition according to the driving distance and the battery power consumption under the historical driving condition includes: when the driving distance of the vehicle under the historical driving condition is less than the preset driving distance, and / or, when the battery power consumption of the vehicle under the historical driving condition is less than the preset power consumption, determining that the historical driving condition type is the first type; when the driving distance of the vehicle under the historical driving condition is greater than or equal to the preset driving distance and the battery power consumption is greater than or equal to the preset power consumption, determining that the historical driving condition type is the second type.

[0013] By determining the type of historical driving conditions based on the driving distance and battery power consumption, the charge and discharge depth determination method corresponding to the historical driving condition type can be adopted to determine the charge and discharge depth of the battery, making the determination of the battery's charge and discharge depth more reasonable.

[0014] In some embodiments, when the historical driving condition type is the first type, determining the charge and discharge depth of the battery according to the historical driving condition type includes: determining the average power consumption under the historical driving condition of the first type according to the battery power consumption under the historical driving condition; determining the charge and discharge depth of the battery according to the average power consumption.

[0015] The battery power consumption under the historical driving condition of the first type can characterize the user's driving habits. Determining the charge and discharge depth of the battery according to the battery power consumption under the historical driving condition of the first type can enable the charge and discharge depth of the battery to meet the user's driving needs. Furthermore, controlling the charge and discharge of the battery within the charge and discharge interval determined by the charge and discharge depth of the battery can not only ensure the battery's endurance but also extend the battery's service life.

[0016] In some embodiments, when the historical driving condition type is the second type, determining the charge and discharge depth of the battery according to the historical driving condition type includes: obtaining the working cycle of the historical driving condition of the second type; when the first preset duration is reached after the end of the historical driving condition of the second type, determining the charge and discharge depth of the battery as the first preset charge and discharge depth, where the first preset duration is less than the working cycle.

[0017] According to the user's usage requirements for the vehicle's long-distance driving conditions, adjust the charge and discharge depth of the vehicle in advance to meet the power consumption requirements of the vehicle's long-distance driving conditions and reduce the number of vehicle charging times.

[0018] In some embodiments, the method for determining the charge and discharge depth of the battery further includes: obtaining the actual scenario data of the vehicle and the reference power consumption data of the reference vehicle in the scenario matching the actual scenario data; adjusting the charge and discharge depth of the battery according to the reference power consumption data; for each historical driving condition, determining the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical driving condition, including: determining the charge and discharge depth of the battery according to the driving distance, battery power consumption, and reference power consumption data under the historical driving condition.

[0019] By adjusting the charge and discharge depth of the vehicle's battery in real time according to the actual scenario data of the vehicle to meet the user's real-time driving needs, making the charge and discharge depth of the battery within a reasonable range, and then controlling the charge and discharge of the battery within the charge and discharge interval corresponding to the charge and discharge depth, the service life of the battery can be extended.

[0020] In some embodiments, after determining the charge and discharge depth of the battery according to the historical working condition type, the actual scenario type in which the vehicle is located is obtained; in the case where the actual scenario type is inconsistent with the scenario type within the historical period, the charge and discharge depth of the battery is adjusted according to the second preset charge and discharge depth corresponding to the actual scenario type. The actual scenario type includes at least one of the following: season, holiday, regional type.

[0021] The charge and discharge depth of the battery is adjusted in real time according to the actual scenario type to meet the user's real-time vehicle usage requirements.

[0022] In some embodiments, the method for determining the charge and discharge depth of the battery further includes: in response to the user's input operation on the vehicle usage condition, determining the target working condition corresponding to the input operation; and determining the charge and discharge depth of the battery according to the target working condition.

[0023] Adjusting the charge and discharge depth of the battery in real time according to the target working condition input by the user can realize the user's independent decision-making power for the vehicle and improve the flexibility of adjusting the charge and discharge depth.

[0024] In some embodiments, the method for determining the charge and discharge depth of the battery further includes: performing a full charge operation on the battery every second preset duration to accurately determine the current remaining power and battery state of the battery, and avoid problems such as overcharging and over-discharging of the battery that cause a reduction in battery life.

[0025] In some embodiments, controlling the battery to charge and discharge within the target charge and discharge range includes:

[0026] Obtaining the battery temperatures at multiple positions in the battery; determining the temperature difference index data corresponding to the battery according to the battery temperatures at the multiple positions; in the case where the temperature difference index data meets the preset conditions, reducing the charge and discharge current of the battery to obtain the target charge and discharge current; and controlling the battery to charge and discharge within the charge and discharge range according to the target charge and discharge current.

[0027] Releasing the charge and discharge current of the battery at a discount according to the temperature difference index data, that is, reducing the charge and discharge current of the battery, so as to reduce the consistency difference of the battery cells in the battery.

[0028] In some embodiments, the temperature difference index data includes a target temperature difference, and the target temperature difference is the maximum value of the temperature differences between any two positions; the preset conditions include: the target temperature difference is greater than the preset temperature difference threshold.

[0029] Releasing the charge and discharge current of the battery at a discount according to the temperature difference of the battery can reduce the consistency difference of the battery cells in the battery due to the temperature difference.

[0030] In some embodiments, the temperature difference index data includes a target temperature change rate, which is the maximum value of the temperature change rates corresponding to multiple positions; the preset condition includes: the target temperature change rate is within a preset temperature change rate range.

[0031] Discounting and releasing the charging and discharging current of the battery according to the change rate of the battery temperature can reduce the consistency difference of the battery cells in the battery due to the sudden rise and fall of the ambient temperature around the battery.

[0032] In some embodiments, reducing the charging and discharging current of the battery includes: reducing the charging and discharging current of the battery according to the correlation between the temperature change rate range and the discount coefficient and the target temperature change rate, where the discount coefficient is a positive number less than or equal to 1.

[0033] Adaptive discounting and releasing of the charging and discharging current of the battery using a discount coefficient adapted to the temperature change rate can reduce the impact of harsh environments on the battery life while improving the service life of the battery.

[0034] In a second aspect, the present application also provides a battery management system, which includes: a sampling circuit for obtaining at least one historical working condition of the vehicle and the vehicle usage data under each historical working condition, where the vehicle usage data includes the driving distance of the vehicle and the battery power consumption; a controller for determining the charge and discharge depth of the battery according to the driving distance and the battery power consumption under each historical working condition for each historical working condition.

[0035] In a third aspect, the present application provides a battery device, which includes a battery and the battery management system as described in the second aspect.

[0036] In a fourth aspect, the present application provides an electrical device, which includes the battery device as described in the third aspect.

[0037] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0039] Figure 1 It is a flowchart of a method for determining the charge and discharge depth of a battery according to an embodiment of the present application;

[0040] Figure 2 It is a flowchart of a method for obtaining the historical working condition of a vehicle and the vehicle usage data according to an embodiment of the present application;

[0041] Figure 3 Flowchart of the method for determining the charge and discharge depth of a battery according to an embodiment of the present application;

[0042] Figure 4 Flowchart of the method for determining the historical operating condition type according to an embodiment of the present application;

[0043] Figure 5 Flowchart of the method for adjusting the charge and discharge depth of a battery according to an embodiment of the present application;

[0044] Figure 6 Flowchart of the method for adjusting the charge and discharge depth of a battery according to an embodiment of the present application;

[0045] Figure 7 Schematic diagram of the static voltage curve according to an embodiment of the present application;

[0046] Figure 8 Flowchart of the charge and discharge control method according to an embodiment of the present application;

[0047] Figure 9 Flowchart of the method for controlling the battery to charge and discharge within a target charge and discharge interval according to an embodiment of the present application;

[0048] Figure 10 Overall flowchart of the method for determining the charge and discharge depth of a battery according to an embodiment of the present application;

[0049] Figure 11 Schematic diagram of the structure of a battery management system according to another embodiment of the present application.

[0050] In the drawings, the drawings are not necessarily drawn to actual scale. Detailed Description of the Invention

[0051] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0054] Referring to "embodiment" in the embodiments of the present application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The occurrence of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the embodiments of the present application may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0056] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0059] The depth of charge and discharge of a battery is the ratio of the amount of electricity consumed during each use of the battery to the total amount of electricity. The depth of charge and discharge of the battery affects the service life of the battery. Among them, a shallower depth of battery discharge has a smaller impact on the aging loss of the battery. Controlling the charge and discharge of the battery with a shallower depth of charge and discharge is beneficial to improving the service life of the battery. For example, when the depth of charge and discharge is between 20% and 80%, after the battery cycle reaches 4000 cls, the battery capacity decays to 80% SOH (State of Health); while when the depth of charge and discharge is between 3% and 100%, after the battery cycle only reaches 1500 cls, the battery capacity decays to 80% SOH.

[0060] In the current battery charge and discharge strategy, the depth of charge and discharge of the battery is usually set between 3% and 100%, which is not conducive to improving the service life of the battery. Currently, the charging method of the battery is usually the constant current charging mode, that is, the charge and discharge current of all the battery cells in the battery is the same. However, due to the individual differences of the battery cells in the battery, in the constant current charging mode, some battery cells with serious aging conditions will age further, resulting in worse consistency of the battery cells.

[0061] Based on this, the embodiments of the present application provide a method for determining the depth of charge and discharge of a battery, a battery management system, a device and equipment. In the embodiments of the present application, the depth of charge and discharge of the vehicle is adjusted in real time through the vehicle usage data of the vehicle under historical working conditions, so that the depth of charge and discharge of the battery is within a reasonable range, which can not only meet the user's vehicle usage needs and does not affect the user's vehicle usage experience, but also improve the service life of the battery while improving the battery endurance.

[0062] The following first introduces the method for determining the depth of charge and discharge of the battery provided by the embodiments of the present application. Among them, the BMS (Battery Management System) in the vehicle can be used as the execution subject of the method provided by the embodiments of the present application.

[0063] In one embodiment, Figure 1 shows a flowchart of the method for determining the depth of charge and discharge of the battery, as Figure 1 shown, this method may include the following steps S101 to step S103:

[0064] Step S101, obtain at least one historical working condition of the vehicle and the vehicle usage data under each historical working condition.

[0065] In step S101, the vehicle usage data of the vehicle under historical working conditions includes the driving distance of the vehicle and the battery power consumption, and the working condition of the vehicle is used to characterize the state between the vehicle start driving moment and the vehicle end driving moment.

[0066] In addition, in step S101, at least one historical operating condition obtained by the BMS may be the historical operating condition within a historical period, and this historical period is a period relatively close to the current time, for example, one week or one month. Among them, using the vehicle usage data within a historical period relatively close to the current time to determine the charge and discharge depth of the battery can not only reduce the amount of data for the BMS to perform data analysis, improve the accuracy and efficiency of determining the charge and discharge depth of the battery, but also improve the rationality of determining the charge and discharge depth, providing a basis for improving the battery endurance and battery service life.

[0067] Step S102: For each historical operating condition, determine the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical operating condition.

[0068] In step S102, the battery power consumption may be the power consumption of the battery module or the power consumption of the battery pack. In the embodiments of the present application, taking the battery as the battery pack and the battery power consumption as the power consumption of the battery pack as an example for explanation, that is, in the relevant descriptions of the embodiments of the present application, the battery refers to the battery pack.

[0069] In step S102, the historical operating conditions can be divided into different types according to the driving distance and battery power consumption of the vehicle under the historical operating conditions. For example, a long-distance operating condition with a long driving distance and a high battery power consumption, and a regular operating condition with a short driving distance and / or a low battery power consumption. For different types of operating conditions, the BMS can determine the charge and discharge depth of the battery under the corresponding operating condition types according to the driving distance and battery power consumption under different types of historical operating conditions. For example, the BMS determines the charge and discharge depth of the vehicle under the regular operating condition based on the driving distance and battery power consumption of the regular historical operating condition; the BMS determines the charge and discharge depth of the vehicle under the long-distance operating condition based on the driving distance and battery power consumption of the long-distance historical operating condition.

[0070] It should be noted that the driving distance and battery power consumption of the vehicle under the historical operating condition can reflect the user's driving habits. Therefore, by step S102, the charge and discharge depth of the battery is determined according to the vehicle usage data of the vehicle under the historical operating condition, and the battery is charged and discharged through this charge and discharge depth of the battery, so that the endurance of the battery is within a reasonable range to meet the user's driving needs, and at the same time, the service life of the battery can also be improved.

[0071] Based on the solutions defined in the above steps S101 to S102, it can be known that in the embodiments of the present application, the vehicle usage data under the historical working conditions of the vehicle can reflect the usage habits of the user using the vehicle. The charge and discharge depth of the battery during the historical charge and discharge process can be determined through the battery power consumption under the vehicle usage data, and the charge and discharge depth during the historical charge and discharge process can reflect the user's usage requirements for the vehicle. Therefore, by adjusting the charge and discharge depth of the battery based on the vehicle usage data under the historical working conditions and performing charge and discharge operations on the battery through the adjusted charge and discharge depth, the battery life can be kept within a reasonable range to meet the user's usage requirements for the vehicle. In addition, in the embodiments of the present application, determining the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical working conditions can keep the charge and discharge depth of the battery within a reasonable range. Furthermore, by controlling the charge and discharge of the battery within the charge and discharge interval corresponding to the charge and discharge depth, the service life of the battery can be improved.

[0072] It can be seen that the solution provided by the embodiments of the present application can not only take into account the battery life but also improve the service life of the battery.

[0073] The implementation process of the method provided by the embodiments of the present application will be introduced below.

[0074] It should be noted that in the embodiments of the present application, the charge and discharge depth of the battery is determined according to the vehicle usage data under the historical working conditions of the vehicle. Therefore, in the embodiments of the present application, it is first necessary to obtain the historical working conditions of the vehicle and the vehicle usage data under each historical working condition.

[0075] In one embodiment, the historical working conditions of the vehicle and the vehicle usage data can be obtained by the method as Figure 2 shown, and this process includes the following steps S201 to S203:

[0076] Step S201, obtain the historical usage data of the vehicle within the historical time period.

[0077] In step S201, the historical time period can be a time period relatively close to the current time, for example, one week or one month. The historical usage data includes the start driving time, end driving time, driving distance, and battery power consumption during the driving process of the vehicle.

[0078] In one example, the vehicle's integrated controller determines the start and end times of vehicle driving based on the driving data of the vehicle collected by the vehicle's sensors in the past month. Additionally, the vehicle is equipped with a positioning system, so that the driving distance of the vehicle can be determined according to the positioning data of the positioning system. The vehicle is also equipped with a current detection component for detecting the power consumption of the battery in the vehicle. The BMS can obtain the start driving time, end driving time, driving distance, and battery power consumption during driving of the vehicle through the integrated controller, positioning system, and current detection component respectively.

[0079] Step S202: Determine at least one historical driving condition of the vehicle within the historical period according to the start driving time and the end driving time.

[0080] In one example, the BMS can determine the state data of the vehicle between adjacent start driving time and end driving time as one driving condition. For example, if the vehicle starts driving at 8 o'clock and stops driving at 9 o'clock, the vehicle state data between 8 o'clock and 9 o'clock is one driving condition.

[0081] In another example, the BMS can also detect the time interval between the end driving time of the previous driving condition and the start driving time of the adjacent next driving condition. If the time interval is less than the preset time interval threshold, the above two driving conditions can be combined into one driving condition. For example, the end driving time of driving condition 1 is 8 o'clock, and the start driving time of driving condition 2 is 8:03. The time interval between the two driving conditions is small, so driving condition 1 and driving condition 2 can be combined into one driving condition.

[0082] Step S203: Determine the vehicle usage data under each historical driving condition according to the driving distance within the historical period and the battery power consumption during driving.

[0083] In step S203, after determining the historical driving condition, the driving distance and battery power consumption of the vehicle under this historical driving condition are used as the vehicle usage data under this historical driving condition.

[0084] It should be noted that through steps S201 to S203, determining the historical driving conditions and vehicle usage data of the vehicle according to the historical usage data of the vehicle within the historical period, and then determining the charge and discharge depth of the battery according to the historical driving conditions of the vehicle, can keep the charge and discharge depth of the battery within a reasonable range. Furthermore, controlling the charge and discharge of the battery within the charge and discharge interval corresponding to this charge and discharge depth can improve the service life of the battery.

[0085] In one embodiment, as Figure 3As shown, after obtaining the historical operating conditions of the vehicle and the vehicle usage data under the historical operating conditions, the BMS can determine the charge and discharge depth of the battery based on the vehicle usage data under the historical operating conditions. That is, step S102 includes the following steps S301 to S302:

[0086] Step S301, for each historical operating condition, determine the historical operating condition type of the historical operating condition according to the driving distance and battery power consumption under the historical operating condition.

[0087] In step S301, the historical operating condition type of the historical operating condition includes the first type and / or the second type. Among them, the first type can be the normal operating condition of the vehicle, that is, the operating condition with a relatively short driving distance and / or relatively little battery power consumption; the second type can be the long-distance operating condition of the vehicle, that is, the operating condition with a relatively long driving distance and a relatively long battery power consumption.

[0088] Step S302, determine the charge and discharge depth of the battery according to the historical operating condition type.

[0089] In step S302, for different historical operating condition types, the average value of the battery power consumption of the historical operating condition under the corresponding historical operating condition type can be used to determine the charge and discharge depth of the battery in the current state. In addition, for different historical operating condition types, the methods for determining the corresponding charge and discharge depths can also be different. For example, for the normal operating condition, the average value of the battery power consumption under the historical operating condition can be used to determine the charge and discharge depth of the battery in the current state; for the long-distance operating condition, a preset charge and discharge depth can be used as the charge and discharge depth of the battery in the current state.

[0090] It should be noted that using the charge and discharge depth determination method corresponding to the historical operating condition type to determine the charge and discharge depth of the battery can make the determination of the charge and discharge depth of the battery more reasonable, meet the user's usage requirements for the vehicle, and at the same time keep the charge and discharge of the battery within a reasonable range, taking into account the battery life while improving the battery's service life.

[0091] In one embodiment, the historical operating condition type can be determined according to the driving distance and battery power consumption of the vehicle under the historical operating condition. As Figure 4 shown, the determination of the historical operating condition type can include the following steps S401 to S402:

[0092] Step S401, when the driving distance of the vehicle under the historical operating condition is less than the preset driving distance and / or the battery power consumption of the vehicle under the historical operating condition is less than the preset power consumption, determine that the historical operating condition type is the first type.

[0093] Step S402: When the driving distance of the vehicle under the historical driving condition is greater than or equal to the preset driving distance and the battery power consumption is greater than or equal to the preset power consumption, determine that the historical driving condition type is the second type.

[0094] As an example, when the battery power consumption of the vehicle under the historical driving condition is greater than 50% SOC (State of Charge), and the driving distance exceeds a certain distance, it can be determined that the historical driving condition is the historical driving condition of the second type.

[0095] It should be noted that by determining the type of the historical driving condition based on the driving distance and the battery power consumption, the charge and discharge depth determination method corresponding to the historical driving condition type can be used to determine the charge and discharge depth of the battery, making the determination of the charge and discharge depth of the battery more reasonable, meeting the user's usage requirements for the vehicle, and at the same time keeping the charge and discharge of the battery within a reasonable range, improving the service life of the battery while taking into account the battery endurance.

[0096] The determination of the charge and discharge depth under the two types of historical driving conditions will be introduced separately below.

[0097] As Figure 4 shown, when the historical driving condition type is the first type, the charge and discharge depth of the battery can be determined by steps S4011 to S4012:

[0098] Step S4011: Determine the average power consumption under the historical driving condition of the first type according to the battery power consumption under the historical driving condition.

[0099] Step S4012: Determine the charge and discharge depth of the battery according to the average power consumption.

[0100] In an example, the BMS can calculate the average value of the battery power consumption of the vehicle under the historical driving condition of the first type in the past month to obtain the average power consumption; then, calculate the ratio between the average power consumption and the rated capacity of the battery to obtain the charge and discharge depth of the battery.

[0101] In another example, the BMS can calculate the charge and discharge depth of the vehicle under each historical driving condition of the first type in the past month, and then calculate the average value of the charge and discharge depth corresponding to the historical driving condition of the first type in the past month, and use the average value of the charge and discharge depth as the charge and discharge depth of the battery.

[0102] It should be noted that the battery power consumption under the historical working conditions of the first type can characterize the user's driving habits. The charge and discharge depth of the battery is determined according to the battery power consumption under the historical working conditions of the first type, so that the charge and discharge depth of the battery can meet the user's driving needs. Furthermore, controlling the charge and discharge of the battery within the charge and discharge interval determined by the charge and discharge depth of the battery can not only ensure the battery life but also extend the service life of the battery.

[0103] As Figure 4 shown, when the historical working condition type is the second type, the charge and discharge depth of the battery can be determined through steps S4021 to S4022:

[0104] Step S4021, obtain the working condition cycle of the historical working conditions of the second type.

[0105] In step S4021, the working condition cycle is the interval duration between the end of the previous historical working condition of the second type and the start of the next historical working condition of the second type. When there are multiple historical working conditions of the second type within the historical period, the working condition cycle can be the average value of the interval durations between adjacent historical working conditions of the second type.

[0106] Step S4022, when the first preset duration is reached after the end of the historical working conditions of the second type, determine the charge and discharge depth of the battery as the first preset charge and discharge depth.

[0107] In step S4022, the first preset charge and discharge depth can be a preset fixed value. For example, 100% SOC. The first preset duration is less than the working condition cycle, that is, after a period of time after the end of the previous historical working condition of the second type, the charge and discharge depth of the battery is adjusted.

[0108] As an example, the historical working condition of the second type is a long-distance working condition. By determining the time interval between long-distance working conditions, it can be determined that the user uses the long-distance working condition once a week (7 days, that is, the working condition cycle) on average. Then, on the 5th or 6th day (that is, the first preset duration) after the user uses the long-distance working condition, the charge and discharge depth of the battery is adjusted to 100% SOC to meet the power consumption requirements of the long-distance working condition.

[0109] Through steps S4021 to S4022, according to the user's usage requirements for the long-distance working condition of the vehicle, the charge and discharge depth of the vehicle is adjusted in advance to meet the power consumption requirements of the vehicle's long-distance working condition and reduce the charging times of the vehicle.

[0110] Furthermore, after determining the charge and discharge depth of the battery, the BMS can also adjust the charge and discharge depth of the battery in real time.

[0111] In one embodiment, as Figure 5As shown in the figure, the method for determining the charge and discharge depth of the battery may further include the following steps S501 to S502:

[0112] Step S501: Obtain the actual scenario data of the vehicle and the reference power consumption data of the reference vehicle in the scenario matching the actual scenario data.

[0113] In step S501, the actual scenario data of the vehicle may include, but is not limited to, the usage time of the vehicle (e.g., holidays, seasons), and the usage area of the vehicle (e.g., southern region, northern region).

[0114] In step S501, the reference vehicle may be a vehicle of the same model or type as this vehicle, and the reference power consumption data may be the battery power consumption of the reference vehicle in the scenario matching the actual scenario data.

[0115] It should be noted that in step S501, the reference vehicle may also be the vehicle itself. In this scenario, the power consumption data of the vehicle in the historical scenario matching the actual scenario data is used as the reference power consumption data. For example, the power consumption data of the vehicle in last winter is used as the reference power consumption data of the vehicle this winter.

[0116] Step S502: Determine the charge and discharge depth of the battery according to the driving distance, battery power consumption, and reference power consumption data under historical working conditions.

[0117] In one example, before the arrival of holidays or when currently in holidays, the BMS may use the vehicle power consumption data of the previous holiday as the reference power consumption data, or use the vehicle power consumption data in the same historical holiday as the reference power consumption data. If this vehicle does not have the vehicle power consumption data of historical holidays, the charge and discharge depth of the battery can be automatically adjusted to 100% SOC, and the corresponding power consumption range is 3% SOC - 100% SOC to meet the vehicle usage needs of users during holidays; or, according to the vehicle power consumption data of historical holidays of other vehicles (i.e., reference vehicles) with the same model or the same vehicle usage needs, adjust the charge and discharge depth of the vehicle.

[0118] In another example, the BMS can also adjust the charge and discharge depth of the battery for different seasons. For example, in winter, the temperature is relatively low and the battery capacity decreases. At this time, according to the vehicle usage needs in previous winters, appropriately increase the charge and discharge depth of the battery to meet the vehicle usage needs of users in winter. Similarly, for summer, the charge and discharge depth of the battery can be appropriately decreased.

[0119] Similar to the holiday scenario, when there is no historical vehicle power consumption data in winter for the vehicle, the charge and discharge depth of the battery can be adjusted to a fixed value, for example, 100% SOC; or the charge and discharge depth of the vehicle can be adjusted according to the historical vehicle power consumption data in winter of other vehicles (i.e., reference vehicles) with the same model or the same vehicle usage requirements.

[0120] In another example, the BMS can also achieve real-time adjustment of the battery charge and discharge depth according to the usage area of the vehicle. For example, in the southern region where the temperature is relatively high, the BMS can appropriately reduce the charge and discharge depth of the battery; in the northern region where the temperature is relatively low, the BMS can appropriately increase the charge and discharge depth of the battery; when the user drives from the northern region to the southern region, the BMS can adjust the charge and discharge depth in real time according to the location of the vehicle.

[0121] It should be noted that by adjusting the charge and discharge depth of the vehicle battery in real time according to the actual scenario data of the vehicle to meet the real-time vehicle usage needs of the user, making the charge and discharge depth of the battery within a reasonable range, and then controlling the charge and discharge of the battery within the charge and discharge interval corresponding to the charge and discharge depth, the service life of the battery can be improved.

[0122] In one embodiment, as Figure 6 shown, after determining the charge and discharge depth of the battery, the method for adjusting the charge and discharge depth of the battery may include the following steps S601 to step S602:

[0123] Step S601, obtain the actual scenario type where the vehicle is located;

[0124] Step S602, in the case where the actual scenario type is inconsistent with the scenario type within the historical period, adjust the charge and discharge depth of the battery according to the second preset charge and discharge depth corresponding to the actual scenario type.

[0125] In the above embodiment, the actual scenario type of the vehicle includes at least one of the following: season, holiday, regional type.

[0126] In one example, the current time is during a holiday, and there was no holiday in the month before the holiday (i.e., the historical period), that is, the actual scenario type of the vehicle is inconsistent with the scenario type within the historical period. At this time, the charge and discharge depth of the battery is automatically adjusted to 100% SOC (i.e., the second preset charge and discharge depth).

[0127] In another example, the current season is winter, and there is no historical usage data of the vehicle in winter within the historical period. Then the BMS adjusts the charge and discharge depth of the vehicle in autumn. For example, the charge and discharge depth of the vehicle in autumn is adjusted to 100% SOC.

[0128] There is also a possible example where the vehicle has been driving in the southern region. When the vehicle enters the northern region, since there is no historical usage data of the vehicle in the northern region, the BMS adjusts the charge and discharge depth of the vehicle in the southern region. For example, the charge and discharge depth when the vehicle is driving in the southern region is increased to 100% SOC.

[0129] The charge and discharge depth of the battery is adjusted in real time according to the actual scenario type to meet the user's real-time vehicle usage needs.

[0130] In one embodiment, the BMS can also respond to the user's input operation on the vehicle usage condition, determine the target condition corresponding to the input operation; furthermore, according to the target condition, determine the charge and discharge depth of the battery.

[0131] In the above embodiment, the target condition can be a second type of condition. The user can operate the condition selection control in the vehicle to select the vehicle condition required by the user. For example, if the user has a temporary long-distance driving need, the long-distance condition can be selected. At this time, the BMS increases the charge and discharge depth of the battery, such as adjusting the charge and discharge depth of the battery to 100% SOC.

[0132] It should be noted that adjusting the charge and discharge depth of the battery in real time according to the target condition input by the user can realize the user's independent decision-making power for the vehicle and improve the flexibility of adjusting the charge and discharge depth.

[0133] In one embodiment, due to the chemical characteristics of the battery, especially the LiFePO4 (lithium iron phosphate) battery, the charge and discharge interval of 20%-80% is a smooth voltage curve, as Figure 7 shown in the static voltage curve. Long-term use of the voltage in this interval will cause the BMS system to be unable to accurately determine the battery power. For example, if the current battery power is 50% SOC, the BMS system may misjudge it as 20% SOC, resulting in false battery power.

[0134] To meet the user's long-distance vehicle usage needs and also for the BMS system to calibrate the battery voltage, in the embodiment of the present application, a full charge operation is performed on the battery every second preset duration to accurately determine the current remaining battery power and battery status, and avoid problems such as overcharging and over-discharging of the battery that cause a reduction in battery life.

[0135] It should be noted that in the embodiment of the present application, the correlation between the charging rate and SOC can be determined by Table 1, or can be adjusted according to the real-time collected data during actual use.

[0136] Table 1

[0137]

[0138] In one embodiment, after determining the charge and discharge depth of the battery according to the historical operating condition type and the battery power consumption corresponding to the historical operating condition, the charge and discharge of the battery can also be controlled, such as Figure 8 As shown, the charge and discharge control method may include steps S801 to S802:

[0139] Step S801, determining a target charge and discharge interval of the battery according to the charge and discharge depth of the battery;

[0140] Step S802: When the battery is being charged and discharged, the battery is controlled to be charged and discharged within a target charge and discharge interval.

[0141] In step S801, the BMS can obtain the lower discharge limit of the battery, and then determine the upper charge limit of the battery according to the charge and discharge depth of the battery and the lower discharge limit; and then determine the target charge and discharge range of the battery according to the lower discharge limit and the upper charge limit. The lower discharge limit of the battery can be a pre-set theoretical value, such as 20% SOC; the lower discharge limit of the battery can also be adjusted in real time according to actual needs.

[0142] In one example, the battery's charge and discharge depth is 70% SOC, and the lower limit of discharge is 20% SOC, then the upper limit of the next charge is: 20% SOC + 70% SOC = 90% SOC. Similarly, if the charge and discharge depth decreases to 60% SOC within a certain period of time, the upper limit of the next charge is adjusted to 80% SOC, and the lower limit of 20% SOC is reserved as a user's backup power. In order to improve the battery life, it is usually not recommended for users to charge after the battery power drops to the lower limit of discharge.

[0143] By limiting the upper limit of battery charging, the battery's charge and discharge SOC is kept in a reasonable range (for example, 20%-80%) for a long time, thus improving the battery life without affecting the user's car experience.

[0144] It should be noted that the charge and discharge interval in the above example can be adjusted from 40% SOC-100% SOC to 20% SOC-80% SOC; similarly, the lower limit of discharge can also be adjusted to 10% SOC, so that the charge and discharge depth can be kept within the charge and discharge interval of 10% SOC-90% SOC as much as possible.

[0145] In another example, there is a correlation between the depth of charge and discharge of the battery and the charge and discharge interval. After obtaining the depth of charge and discharge of the battery, the BMS can determine the charge and discharge interval corresponding to the depth of charge and discharge based on this correlation. For example, when the depth of charge and discharge is less than 50% SOC, the charge and discharge interval is the first interval, such as 30% SOC - 80% SOC; when the depth of charge and discharge is greater than or equal to 50% SOC and less than 60% SOC, the charge and discharge interval is the second interval, such as 20% SOC - 80% SOC; when the depth of charge and discharge is greater than or equal to 60% SOC and less than 70% SOC, the charge and discharge interval is the third interval, such as 20% SOC - 90% SOC; when the depth of charge and discharge is greater than or equal to 70% SOC and less than 80% SOC, the charge and discharge interval is the fourth interval, such as 10% SOC - 90% SOC.

[0146] It should be noted that the above correlation between the depth of charge and discharge and the charge and discharge interval is only an example. In actual use, the above correlation can be adjusted according to the performance of the vehicle, operating conditions, etc.

[0147] In one embodiment, as Figure 9 shown, step S802, that is, controlling the battery to charge and discharge within the target charge and discharge interval, may include the following steps S901 to S904:

[0148] Step S901, obtaining the battery temperatures at multiple positions in the battery;

[0149] Step S902, determining the temperature difference index data corresponding to the battery according to the battery temperatures at multiple positions;

[0150] Step S903, when the temperature difference index data meets the preset conditions, reducing the charge and discharge current of the battery to obtain the target charge and discharge current;

[0151] Step S904, controlling the battery to charge and discharge within the charge and discharge interval according to the target charge and discharge current.

[0152] It should be noted that there are differences in the driving habits of different users. When the battery is charged and discharged with a large current, the battery temperature will rise, and the heat dissipation capabilities of the battery cells in different parts of the battery are different, that is, there are differences in the temperatures of different parts of the battery. Generally, the higher the battery temperature, the stronger the dynamics of lithium ions in the battery, and the stronger the charge and discharge ability. If the temperature difference between different parts of the battery is too large, the BMS system will control the charge and discharge current of the battery with the higher temperature or the temperature average value as the input item, resulting in the overloading of the battery cells in the lower temperature parts, accelerating aging, and increasing the consistency difference between the battery cells in the module. In this regard, in the embodiments of the present application, the charge and discharge current of the battery is discounted and released according to the temperature difference index data, that is, the charge and discharge current of the battery is reduced to reduce the consistency difference between the battery cells in the battery.

[0153] In the above embodiments, the temperature difference index data may include a target temperature difference, which is the maximum value of the temperature differences between any two positions; the preset conditions include: the target temperature difference is greater than a preset temperature difference threshold.

[0154] As an example, the positions in the above battery may be the terminal post positions of the battery, and the temperatures at different positions of the battery may be the temperatures at different positions in the largest surface of the battery. Among them, the largest surface of the battery is the surface with the largest area among all the surfaces of the battery; if there are multiple largest surfaces in the battery, any one of the multiple largest surfaces is selected as the largest surface of the battery.

[0155] In a scenario where multiple temperature sensors are dispersedly arranged inside the battery pack, each temperature sensor collects the temperature at one position. At this time, the BMS can obtain the temperatures collected by each temperature sensor, calculate the differences between the temperatures collected by any two of the multiple temperature sensors, and determine the maximum temperature difference as the target temperature difference.

[0156] In a scenario where the position in the battery is the terminal post position of the battery, the BMS can obtain the terminal post temperatures at each terminal post position in the battery, and then, according to the preset correlation relationship between the terminal post temperature and the cell temperature, convert the terminal post temperature into the temperature corresponding to each position.

[0157] It should be noted that in the battery, the collection points of the cell temperature are usually set on the battery cover, and the terminal post temperature on the cover cannot directly reflect the temperature difference situation of the largest surface of the cell. Therefore, it is necessary to perform conversion in combination with simulation and actual measurement. However, due to different battery structures (such as single-largest-surface water-cooling structure, double-largest-surface water-cooling structure, bottom water-cooling structure, etc.), the above temperature conversion logic will be different, and this difference will reduce the accuracy of the largest-surface temperature detection of the battery. In this regard, in the embodiments of the present application, the conversion between the terminal post temperature and the largest-surface temperature of the battery is realized through an empirical value, that is, the preset correlation relationship between the terminal post temperature and the cell temperature is 0.75T - 4, where T is the terminal post temperature.

[0158] Furthermore, after collecting the battery temperatures at multiple positions of the battery, the temperature differences between different positions at the same moment can be calculated, and the maximum value among the temperature differences is used as the target temperature difference; then, compare the size between the target temperature difference and the preset temperature difference threshold. If the target temperature difference is greater than the preset temperature difference threshold and the heating circuit of the BMS system is not turned on, the charging and discharging current of the battery is released at a discount, where the discounted charging and discharging current value = mapping * K, where mapping is the original charging current or discharging current of the battery, and K is the discount coefficient.

[0159] It should be noted that in the above embodiments, the discount coefficient K can be preset or adjusted by collecting data in historical working conditions; the current release value is close to the charge and discharge current value in the user's working condition and does not exceed the protection coefficient (preset, for example, 0.95).

[0160] In addition, it should be noted that by discounting and releasing the charge and discharge current of the battery according to the temperature difference of the battery, the consistency difference of the battery cells in the battery due to temperature difference can be reduced.

[0161] In the above embodiments, the temperature difference index data may further include a target temperature change rate, and the target temperature change rate is the maximum value of the temperature change rates corresponding to multiple positions; the preset conditions include: the target temperature change rate is within a preset temperature change rate range. Among them, the target temperature change rate can be the temperature change rate of the battery position with the largest temperature change at different times. As an example, the temperature change rate of the battery can be expressed as: A = (T2 - T1) / t, where T2 and T1 are the battery temperatures at the same position at different times, and t is the acquisition time interval between T1 and T2.

[0162] It should be noted that in the embodiments of the present application, by discounting and releasing the charge and discharge current of the battery according to the change rate of the battery temperature, the consistency difference of the battery cells in the battery caused by the sudden rise and fall of the ambient temperature around the battery can be reduced.

[0163] In one embodiment, the BMS can reduce the charge and discharge current of the battery according to the correlation between the temperature change rate range and the discount coefficient and the target temperature change rate.

[0164] In the above embodiments, the discount coefficient is a positive number less than or equal to 1. Among them, the BMS can determine the discount coefficient corresponding to the target temperature change rate according to the correlation between the temperature change rate range and the discount coefficient, and then adjust the charge and discharge current of the battery through this discount coefficient.

[0165] In the embodiments of the present application, there is a correlation between the discount coefficient and the temperature change rate range, that is, the degree of current discount release corresponding to different temperature change rate ranges is also different. For example, when the battery temperature change rate A < 5°C / s, the discount coefficient K = 1; when 5°C / s ≤ A < 10°C / s, the discount coefficient K = 0.9; when 10°C / s ≤ A, K = 0.8.

[0166] It should be noted that by adaptively discounting and releasing the charge and discharge current of the battery with a discount coefficient adapted to the temperature change rate, the impact of harsh environments on battery life can be reduced while improving the service life of the battery.

[0167] In another embodiment, the temperature difference index data includes the target temperature difference and the target temperature change rate. In this scenario, the BMS first detects whether the target temperature difference is greater than a preset temperature difference threshold. If the target temperature difference is greater than the preset temperature difference threshold, it can be determined that the charge and discharge current of the battery needs to be released at a discounted rate. At this time, the BMS further detects the target temperature change rate, and then determines the discount coefficient for releasing the charge and discharge current of the battery according to the temperature change rate interval in which the target temperature change rate is located.

[0168] So far, the explanation of the method provided in the embodiments of the present application is completed.

[0169] Figure 10 The overall flowchart of the method provided in the embodiments of the present application is shown, as Figure 10 shown, the method includes the following steps S1001 to step S1006:

[0170] Step S1001, obtaining vehicle usage data of the vehicle under historical working conditions;

[0171] Step S1002, determining the historical working condition type according to the vehicle usage data. If the historical working condition type is a long-distance working condition, step S1005 is executed; otherwise, step S1003 is executed;

[0172] Step S1003, determining the charge and discharge depth of the battery according to the battery power consumption in the vehicle usage data;

[0173] Step S1004, determining the charge and discharge interval of the battery according to the set lower limit value of battery discharge and the charge and discharge depth, and controlling the battery to charge and discharge within this charge and discharge interval;

[0174] Step S1005, performing a full charge operation on the battery;

[0175] Step S1006, determining the preset charge and discharge depth as the charge and discharge depth of the battery, and controlling the charge and discharge of the battery based on this charge and discharge depth.

[0176] In the embodiments of the present application, the charge and discharge depth of the battery is adjusted in real time in combination with the historical working conditions of the vehicle, so as to balance the battery life and the battery service life. In addition, in the embodiments of the present application, the charge and discharge current is also calculated and adjusted in real time to avoid the battery from working overload and improve the service life of the battery.

[0177] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0178] In one embodiment, Figure 11 A schematic structural diagram of a battery management system is shown. It can be seen from Figure 11 that the battery management system includes: a sampling circuit 1101 and a controller 1102.

[0179] The sampling circuit 1101 is used to obtain at least one historical operating condition of the vehicle and vehicle usage data under each historical operating condition. Among them, the vehicle usage data includes the driving distance of the vehicle and the battery power consumption.

[0180] The controller 1102 is used to determine the charge and discharge depth of the battery for each historical operating condition according to the driving distance and battery power consumption under the historical operating condition.

[0181] In the embodiments of the present application, the combination of the controller and the sampling circuit can implement the method for determining the charge and discharge depth of the battery provided in the embodiments of the present application.

[0182] In the embodiments of the present application, the sampling circuit may be composed of multiple data acquisition components. Among them, the data acquisition components may include, but are not limited to, positioning components, power detection components, temperature acquisition components, etc. In the embodiments of the present application, the sampling circuit can collect various data required in the process of implementing the method provided in the embodiments of the present application. For example, the driving distance of the vehicle, the battery power consumption, the start and end times of vehicle driving, the temperature at different positions of the battery, etc.

[0183] The controller can implement the data processing process in the method provided in the embodiments of the present application, including but not limited to the processing of vehicle usage data under historical operating conditions, the determination of historical operating condition types, the determination and adjustment of the charge and discharge depth of the battery, the full charge and full discharge operation of the battery, the charge and discharge control of the battery, etc.

[0184] It should also be noted that the process of the sampling circuit implementing data acquisition, and the process of the controller implementing the determination, adjustment of the battery depth and battery charge and discharge control have been introduced above and will not be repeated here.

[0185] In one embodiment, the present application further provides a battery device, which includes a battery and the above-mentioned battery management system. The battery management system can adjust the charge and discharge depth of the battery and control the charging and discharging of the battery.

[0186] In one embodiment, the present application further provides an electrical device, which may include the battery device in the above embodiment. As an example, the electrical device may be a vehicle, for example, an electric vehicle powered by a battery, or other vehicles including a battery and a battery management system.

[0187] 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 descriptions of known methods are 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. 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.

[0188] It should also be noted that the functional blocks shown in the above 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 function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. A "machine-readable medium" can include any medium capable of storing or transmitting 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, etc. The code segment can be downloaded via a computer network such as the Internet or an intranet.

[0189] It also needs to 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, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0190] As described above with reference to the flowchart and / or block diagram of the method, apparatus, medium, and product for determining the depth of charge and discharge of a battery according to an embodiment of the present application. It should be understood that each block in the flowchart and / or block diagram, and the combination of each block in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to generate 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 is also understood that each block in the block diagram and / or flowchart, and the combination of the blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for determining the depth of charge and discharge of a battery, characterized in that: include: Acquire at least one historical operating condition of the vehicle and vehicle usage data under each of the historical operating conditions, wherein the vehicle usage data includes a travel distance and a battery power consumption of the vehicle; For each of the historical operating conditions, determining the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical operating conditions; The method further includes: determining a target charge and discharge interval of the battery according to the charge and discharge depth of the battery; and controlling the battery to charge and discharge within the target charge and discharge interval when the battery is being charged and discharged; Determining the target charge and discharge interval of the battery according to the charge and discharge depth of the battery includes: obtaining a discharge lower limit value of the battery corresponding to the charge and discharge depth; determining a charge upper limit value of the battery according to the charge and discharge depth of the battery and the discharge lower limit value; and determining the target charge and discharge interval of the battery according to the discharge lower limit value and the charge upper limit value.

2. The method according to claim 1, characterized in that: The obtaining of at least one historical operating condition of the vehicle and vehicle usage data under each of the historical operating conditions includes: Acquiring historical usage data of the vehicle in a historical period, the historical usage data including the start driving time, end driving time, driving distance and battery power consumption during driving of the vehicle; Determining at least one historical operating condition of the vehicle within the historical period according to the start driving time and the end driving time; The vehicle usage data under each of the historical working conditions is determined according to the driving distance in the historical period and the battery power consumption during the driving process.

3. The method according to claim 1, characterized in that For each of the historical operating conditions, determining the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical operating condition includes: For each of the historical operating conditions, determining a historical operating condition type of the historical operating condition according to the driving distance and battery power consumption under the historical operating condition; Determine the charge and discharge depth of the battery according to the historical operating condition type.

4. The method according to claim 3, characterized in that in, The historical operating condition type includes a first type and a second type, and for each of the historical operating conditions, determining the historical operating condition type of the historical operating condition according to the driving distance and battery power consumption under the historical operating condition includes: When the driving distance of the vehicle under the historical operating condition is less than a preset driving distance, and / or the battery power consumption of the vehicle under the historical operating condition is less than a preset power consumption, determining that the historical operating condition type is the first type; When the driving distance of the vehicle under the historical operating condition is greater than or equal to the preset driving distance, and the battery power consumption is greater than or equal to the preset power consumption, the historical operating condition type is determined to be the second type.

5. The method according to claim 4, characterized in that When the historical operating condition is of the first type, determining the charge and discharge depth of the battery according to the historical operating condition type includes: Determine the average power consumption under the first type of historical operating conditions according to the battery power consumption under the historical operating conditions; The charge and discharge depth of the battery is determined according to the average power consumption.

6. The method according to claim 5, characterized in that When the historical operating condition type is the second type, determining the charge and discharge depth of the battery according to the historical operating condition type includes: Obtaining the operating condition cycle of the second type of historical operating condition; When the second type of historical operating condition ends and reaches a first preset time length, the charge and discharge depth of the battery is determined as a first preset charge and discharge depth, wherein the first preset time length is less than the operating condition cycle.

7. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: Acquire actual scene data of the vehicle and reference power consumption data of a reference vehicle in a scene matching the actual scene data; For each of the historical operating conditions, determining the charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical operating condition includes: The charge and discharge depth of the battery is determined according to the driving distance under the historical operating conditions, the battery power consumption and the reference power consumption data.

8. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: Obtaining the actual scene type in which the vehicle is located; When the actual scene type is inconsistent with the scene type in the historical period, the charge and discharge depth of the battery is adjusted according to a second preset charge and discharge depth corresponding to the actual scene type.

9. The method according to claim 8, characterized in that The actual scene type includes at least one of the following: season, holiday, and area type.

10. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: In response to a user input operation on a vehicle usage condition, determining a target condition corresponding to the input operation; Determine the charge and discharge depth of the battery according to the target operating condition.

11. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: The battery is fully charged every second preset time period.

12. The method according to claim 1, characterized in that The controlling the battery to charge and discharge within the target charge and discharge interval includes: Acquiring battery temperatures at multiple locations in the battery; Determining temperature difference index data corresponding to the battery according to the battery temperatures at the multiple positions; When the temperature difference index data meets a preset condition, reducing the charge and discharge current of the battery to obtain a target charge and discharge current; The battery is controlled to charge and discharge within the charge and discharge interval according to the target charge and discharge current.

13. The method according to claim 12, characterized in that The temperature difference index data includes a target temperature difference value, and the target temperature difference value is the maximum value of the temperature difference between any two positions; The preset condition includes: the target temperature difference is greater than a preset temperature difference threshold.

14. The method according to claim 12, characterized in that The temperature difference index data includes a target temperature change rate, and the target temperature change rate is the maximum value of the temperature change rates corresponding to the multiple positions; The preset condition includes: the target temperature change rate is within a preset temperature change rate range.

15. The method according to claim 14, characterized in that The step of reducing the charge and discharge current of the battery comprises: According to the correlation between the temperature change rate interval and the discount coefficient and the target temperature change rate, the charge and discharge current of the battery is reduced, wherein the discount coefficient is a positive number less than or equal to 1.

16. A battery management system, characterized in that: include: A sampling circuit, used to obtain at least one historical operating condition of the vehicle and vehicle usage data under each of the historical operating conditions, wherein the vehicle usage data includes a travel distance of the vehicle and a battery power consumption; A controller, for determining, for each of the historical operating conditions, a charge and discharge depth of the battery according to the driving distance and battery power consumption under the historical operating conditions; The controller is also used to determine a target charge and discharge interval of the battery according to the charge and discharge depth of the battery; and when the battery is being charged and discharged, control the battery to be charged and discharged within the target charge and discharge interval; The controller is also used to obtain a lower discharge limit value of the battery corresponding to the charge and discharge depth; determine an upper charge limit value of the battery according to the charge and discharge depth of the battery and the lower discharge limit value; and determine a target charge and discharge interval of the battery according to the lower discharge limit value and the upper charge limit value.

17. A battery device, characterized in that: The invention comprises a battery and the battery management system as claimed in claim 16.

18. An electrical equipment, characterized in that: A battery device comprising the battery device of claim 17.

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