Battery charge and discharge depth determination method, battery management system, device and equipment

Abstract

The invention discloses a battery charging and discharging depth determination method, a battery management system, a battery management device and battery management equipment. The method comprises the following steps: acquiring at least one historical working condition of a vehicle and vehicle use data under each historical working condition, wherein the vehicle use data comprises the driving distance of the vehicle and the power consumption of a battery; for each historical working condition, the charging and discharging depth of the battery is determined according to the driving distance and the power consumption of the battery under the historical working condition; determining a target charge-discharge interval of the battery according to the charge-discharge depth of the battery; and under the condition that the battery is charged and discharged, controlling the battery to be charged and discharged in the target charging and discharging interval. According to the scheme provided by the invention, the service life of the battery can be prolonged while the endurance of the battery is considered.

Description

Technical Field

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

[0002] The depth of charge and discharge of the battery affects the battery life. If the discharge depth of the battery is too deep, the battery life can be improved, but the battery life will be reduced. If the discharge depth of the battery is too shallow, the battery life can be improved, but the battery life will be reduced.

[0003] It can be seen that how to determine the depth of battery charge and discharge is of great significance for balancing battery life and improving battery service 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 taking into account the battery life.

[0005] In a first aspect, the present application provides a method for determining a battery charge and discharge depth, the method comprising: obtaining historical operating conditions of a vehicle within a historical period and vehicle usage data under each historical operating condition, the vehicle usage data including the vehicle's driving distance and battery power consumption; for each historical operating condition, determining a historical operating condition type of the historical operating condition based on the driving distance and battery power consumption under the historical operating condition; determining the battery charge and discharge depth based on the historical operating condition type; determining a target charge and discharge range of the battery based on the battery charge and discharge depth; and when the battery is charging and discharging, controlling the battery to charge and discharge within the target charge and discharge range.

[0006] It can be seen from the above content that in the embodiment of the present application, the vehicle usage data under the historical working conditions of the vehicle can reflect the user's use habits of the vehicle, and the battery power consumption under the vehicle usage data can determine the charge and discharge depth of the battery in the historical charge and discharge process, and the charge and discharge depth in the historical charge and discharge process can reflect the user's use needs for the vehicle. Therefore, the charge and discharge depth of the battery is adjusted based on the vehicle usage data under the historical working conditions, and the battery is charged and discharged through the adjusted charge and discharge depth, so that the battery life is within a reasonable range and meets the user's use needs for the vehicle. In addition, in the embodiment of the present application, the charge and discharge depth of the battery is determined according to the driving distance and battery power consumption under the historical working conditions, so that the charge and discharge depth of the battery can be 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 limiting the charge and discharge interval of the battery charging, the charge and discharge SOC of the battery is kept in a reasonable range for a long time, and the service life of the battery is improved without affecting the user's car experience.

[0007] It can be seen that the solution provided in the embodiment of the present application can not only take into account the battery life, but also improve the battery life.

[0008] In some embodiments, historical operating conditions of a vehicle within a historical period and vehicle usage data under each historical operating condition are obtained, including: obtaining historical usage data of the vehicle within a historical period, the historical usage data including the vehicle's start driving time, end driving time, driving distance, and battery power consumption during driving; determining at least one historical operating condition of the vehicle within the historical period based on the start driving time and the end driving time; determining the vehicle usage data under each historical operating condition based on the driving distance within the historical period and the battery power consumption during driving.

[0009] By determining the historical operating conditions and usage data of the vehicle based on the historical usage data of the vehicle within a historical period, and then determining the charge and discharge depth of the battery based on the historical operating conditions of the vehicle, the charge and discharge depth of the battery can be kept 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 can increase the service life of the battery.

[0010] In some embodiments, for each historical operating condition, the charge and discharge depth of the battery is determined based on the driving distance and battery power consumption under the historical operating condition, including: for each historical operating condition, determining the historical operating condition type of the historical operating condition based on the driving distance and battery power consumption under the historical operating condition; determining the charge and discharge depth of the battery based on the historical operating condition type.

[0011] Adopting 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 charge and discharge depth of the battery determined more reasonably, meet the user's needs for vehicle use, and at the same time make the battery charge and discharge within a reasonable range, while taking into account the battery life and improving the battery life.

[0012] In some embodiments, the historical operating condition type includes a first type and / or a second type. The historical operating condition type is determined based on the driving distance and battery power consumption under the historical operating condition, including: 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 the preset power consumption, the historical operating condition type is determined to be 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.

[0013] By determining the type of historical operating condition according to the driving distance and the battery power consumption, the charge and discharge depth determination method corresponding to the historical operating condition type can be used to determine the charge and discharge depth of the battery, so that the charge and discharge depth of the battery can be determined more reasonably.

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

[0015] The battery power consumption under the first type of historical operating conditions can characterize the user's vehicle usage habits. The battery charge and discharge depth can be determined based on the battery power consumption under the first type of historical operating conditions, so that the battery charge and discharge depth can meet the user's vehicle usage needs, and then the battery charge and discharge is controlled within the charge and discharge range determined by the battery charge and discharge depth, which can not only ensure the battery life, but also improve the battery life.

[0016] In some embodiments, when the historical operating condition type is the second type, the charge and discharge depth of the battery is determined according to the historical operating condition type, including: obtaining the operating condition cycle of the historical operating condition of the second type; after 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 the first preset charge and discharge depth, wherein the first preset time length is less than the operating condition cycle.

[0017] According to the user's demand for the vehicle's long-distance use, the vehicle's charge and discharge depth is adjusted in advance to meet the vehicle's power demand for long-distance use and reduce the number of times the vehicle needs to be charged.

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

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

[0020] In some embodiments, after determining the charge and discharge depth of the battery according to the historical operating condition type, the actual scene type of the vehicle is obtained; if 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 the second preset charge and discharge depth corresponding to the actual scene type. The actual scene type includes at least one of the following: season, holiday, and region type.

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

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

[0023] Real-time adjustment of the battery's charge and discharge depth based on the target operating conditions input by the user can enable the user to make independent decisions about the vehicle and improve the flexibility of charge and discharge depth adjustment.

[0024] In some embodiments, the method for determining the battery charge and discharge depth also includes: performing a full charging operation on the battery every second preset time period to accurately determine the current remaining power and battery status of the battery, and avoid problems such as overcharging or over-discharging of the battery that may reduce the battery life.

[0025] In some embodiments, controlling the battery to charge and discharge within a target charge and discharge interval includes: Obtain battery temperatures at multiple locations in the battery; determine temperature difference index data corresponding to the battery according to the battery temperatures at the multiple locations; when the temperature difference index data meets a preset condition, reduce the charge and discharge current of the battery to obtain a target charge and discharge current; and control the battery to charge and discharge within a charge and discharge range according to the target charge and discharge current.

[0026] The battery's charge and discharge current is discounted based on the temperature difference index data, that is, the battery's charge and discharge current is reduced to reduce the consistency differences of the battery cells in the battery.

[0027] In some embodiments, the temperature difference index data includes a target temperature difference value, which is the maximum value of the temperature difference between any two positions; the preset conditions include: the target temperature difference value is greater than a preset temperature difference threshold value.

[0028] Discounting the charge and discharge current of the battery according to the temperature difference of the battery can reduce the consistency difference of the battery cells in the battery caused by temperature difference.

[0029] 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 conditions include: the target temperature change rate is within a preset temperature change rate range.

[0030] Discounting the charge and discharge current of the battery according to the rate of change of the battery temperature can reduce the consistency difference of the battery cells in the battery caused by the sudden rise and fall of the ambient temperature around the battery.

[0031] In some embodiments, reducing the charge and discharge current of the battery includes: reducing the charge and discharge current of the battery according to a correlation between the temperature change rate interval and the discount coefficient and the target temperature change rate, wherein the discount coefficient is a positive number less than or equal to 1.

[0032] Adopting a discount coefficient that matches the temperature change rate to adaptively discount the battery's charge and discharge current can reduce the impact of harsh environments on battery life and improve the battery's service life.

[0033] In a second aspect, the present application also provides a battery management system, which includes: a sampling circuit for acquiring at least one historical operating condition of a vehicle and vehicle usage data under each historical operating condition, the vehicle usage data including the vehicle's driving distance and battery power consumption; a controller for determining the battery charge and discharge depth for each historical operating condition based on the driving distance and battery power consumption under the historical operating condition.

[0034] In a third aspect, the present application provides a battery device, which includes a battery and a battery management system as described in the second aspect.

[0035] In a fourth aspect, the present application provides an electrical device, which includes the battery device as described in the third aspect.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0038] Figure 1 A flowchart of a method for determining a battery charge and discharge depth according to an embodiment of the present application; Figure 2 A flowchart of a method for acquiring historical operating conditions and vehicle usage data of a vehicle according to an embodiment of the present application; Figure 3A flow chart of a method for determining a battery charge and discharge depth according to an embodiment of the present application; Figure 4 A flow chart of a method for determining a historical operating condition type according to an embodiment of the present application; Figure 5 A flow chart of a method for adjusting the charge and discharge depth of a battery according to an embodiment of the present application; Figure 6 A flow chart of a method for adjusting the charge and discharge depth of a battery according to an embodiment of the present application; Figure 7 A schematic diagram of a static voltage curve according to an embodiment of the present application; Figure 8 This is a flow chart of a charge and discharge control method according to an embodiment of the present application; Fig. 9 A flowchart of a method for controlling a battery to charge and discharge within a target charge and discharge interval according to an embodiment of the present application; Fig.10 This is an overall flow chart of a method for determining a battery charge and discharge depth according to an embodiment of the present application; Fig.11 This is a schematic diagram of the structure of a battery management system according to another embodiment of the present application.

[0039] In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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 this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] Mentioning "embodiment" in the embodiments of the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiment described in the embodiments of the present application can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of 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 the specific circumstances.

[0048] The charge and discharge depth of a battery is the ratio of the amount of power consumed by the battery during each use to the total power. The charge and discharge depth of a battery affects the service life of the battery. A shallower discharge depth has less effect on the aging loss of the battery. Using a shallower charge and discharge depth to control the charge and discharge of the battery is beneficial to increasing the service life of the battery. For example, at a charge and discharge depth of 20%-80%, the battery capacity decays to 80% SOH (State of Health) after the battery cycle reaches 4000cls; and at a charge and discharge depth of 3%-100%, the battery capacity decays to 80% SOH after the battery cycle reaches only 1500cls.

[0049] In the current battery charging and discharging strategy, the battery charging and discharging depth is usually set to 3%-100%, which is not conducive to improving the battery life. At present, the battery charging method is usually constant current charging mode, that is, the charging and discharging current of all cells in the battery is the same. However, due to the individual differences of the cells in the battery, some severely aged cells will further age in the constant current charging mode, resulting in poor cell consistency.

[0050] 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 car use needs without affecting the user's car use experience, but also improve the battery life while improving the battery life.

[0051] The following first introduces the method for determining the battery charge and discharge depth provided in the embodiment 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 in the embodiment of the present application.

[0052] In one embodiment, Figure 1 A flow chart showing a method for determining a battery charge and discharge depth is shown in FIG. Figure 1 As shown, the method may include the following steps S101 to S103: Step S101, obtaining at least one historical operating condition of the vehicle and vehicle usage data under each historical operating condition.

[0053] In step S101, the vehicle usage data of the vehicle under historical operating conditions includes the vehicle's driving distance and battery power consumption. The vehicle's operating condition is used to characterize the state between the time when the vehicle starts driving and the time when the vehicle ends driving.

[0054] In addition, in step S101, at least one historical operating condition acquired by the BMS may be a historical operating condition within a historical period, which is a period close to the current time, for example, a week or a month. Among them, using the vehicle usage data within the historical period close to the current time to determine the charge and discharge depth of the vehicle can not only reduce the amount of data analyzed by the BMS, improve the accuracy and efficiency of determining the battery charge and discharge depth, but also improve the rationality of the charge and discharge depth determination, providing a basis for improving battery endurance and battery life.

[0055] 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.

[0056] 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 embodiment of the present application, the battery is a battery pack and the battery power consumption is the power consumption of the battery pack as an example for explanation. That is, in the relevant description of the embodiment of the present application, the battery refers to the battery pack.

[0057] 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, long-distance operating conditions with a long driving distance and high battery power consumption, and regular operating conditions with a short driving distance and / or low battery power consumption. For different types of operating conditions, the BMS can determine the battery charge and discharge depth under the corresponding operating condition type 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 regular operating conditions based on the driving distance and battery power consumption under regular historical operating conditions; the BMS determines the charge and discharge depth of the vehicle under long-distance operating conditions based on the driving distance and battery power consumption under long-distance historical operating conditions.

[0058] It should be noted that the vehicle's driving distance and battery power consumption under historical operating conditions can reflect the user's vehicle usage habits. Therefore, step S102 determines the battery charge and discharge depth based on the vehicle usage data under historical operating conditions, and charges and discharges the battery based on the battery charge and discharge depth to keep the battery life within a reasonable range, thereby meeting the user's vehicle usage needs and also improving the battery life.

[0059] Based on the scheme defined by the above steps S101 to S102, it can be known that in the embodiment of the present application, the vehicle usage data under the historical working conditions of the vehicle can reflect the user's usage habits of the vehicle, and the battery power consumption under the vehicle usage data can be used to determine the charge and discharge depth of the battery in the historical charge and discharge process, and the charge and discharge depth in the historical charge and discharge process can reflect the user's use needs for the vehicle. Therefore, the charge and discharge depth of the battery is adjusted based on the vehicle usage data under the historical working conditions, and the battery is charged and discharged through the adjusted charge and discharge depth, so that the battery life is within a reasonable range and meets the user's use needs for the vehicle. In addition, in the embodiment of the present application, the charge and discharge depth of the battery is determined according to the driving distance and battery power consumption under the historical working conditions, so that the charge and discharge depth of the battery is within a reasonable range, and then the charge and discharge of the battery is controlled within the charge and discharge interval corresponding to the charge and discharge depth, which can improve the service life of the battery.

[0060] It can be seen that the solution provided in the embodiment of the present application can not only take into account the battery life, but also improve the battery life.

[0061] The following is an introduction to the implementation process of the method provided in the embodiment of the present application.

[0062] It should be noted that in the embodiment of the present application, the charge and discharge depth of the battery is determined based on the vehicle usage data under the vehicle's historical operating conditions. Therefore, in the embodiment of the present application, it is first necessary to obtain the vehicle's historical operating conditions and the vehicle usage data under each historical operating condition.

[0063] In one embodiment, the historical operating conditions and vehicle usage data of the vehicle can be obtained by Figure 2 The method shown in the figure is used to obtain the result, and the process includes the following steps S201 to S203: Step S201, obtaining historical usage data of the vehicle in a historical period.

[0064] In step S201, the historical period may be a period close to the current time, for example, one week or one month. The historical usage data includes the vehicle's start driving time, end driving time, driving distance, and battery power consumption during driving.

[0065] In one example, the vehicle controller in the vehicle uses the driving data of the vehicle collected by the vehicle's sensors in the past month to determine the time when the vehicle starts and ends. In addition, the vehicle is also equipped with a positioning system, so that the vehicle's driving distance can be determined based on the positioning data of the vehicle by the positioning system. The vehicle is also equipped with a current detection component for detecting the battery power consumption in the vehicle. The BMS can obtain the vehicle's start time, end time, driving distance, and battery power consumption during driving through the vehicle controller, positioning system, and current detection component.

[0066] Step S202, determining at least one historical operating condition of the vehicle within a historical period according to the driving start time and the driving end time.

[0067] In one example, the BMS may determine the vehicle status data between adjacent start and end driving times as one operating condition. For example, if the vehicle starts driving at 8 o'clock and stops driving at 9 o'clock, the vehicle status data between 8 o'clock and 9 o'clock is one operating condition.

[0068] In another example, the BMS can also detect the time interval between the end time of the previous operating condition and the start time of the next adjacent operating condition. If the time interval is less than a preset time interval threshold, the above two operating conditions can be merged into one operating condition. For example, the end time of operating condition 1 is 8 o'clock, and the start time of operating condition 2 is 8:03. If the time interval between the two operating conditions is small, operating condition 1 and operating condition 2 can be merged into one operating condition.

[0069] Step S203, determining vehicle usage data under each historical operating condition based on the driving distance in the historical period and the battery power consumption during driving.

[0070] In step S203, after the historical operating condition is determined, the driving distance and battery power consumption of the vehicle under the historical operating condition are used as the vehicle usage data under the historical operating condition.

[0071] It should be noted that, through steps S201 to S203, the historical operating conditions and vehicle usage data of the vehicle are determined based on the historical usage data of the vehicle in the historical period, and then the charge and discharge depth of the battery is determined based on the historical operating conditions of the vehicle. This can make the charge and discharge depth of the battery within a reasonable range, and then control the charge and discharge of the battery within the charge and discharge interval corresponding to the charge and discharge depth, which can improve the service life of the battery.

[0072] In one embodiment, 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 according to the vehicle usage data under the historical operating conditions, that is, step S102 includes the following steps S301 to S302: 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.

[0073] In step S301, the historical operating condition types of the historical operating conditions include a first type and / or a second type, wherein the first type may be a normal operating condition of the vehicle, i.e., a condition with a shorter driving distance and / or less battery power consumption; the second type may be a long-distance operating condition of the vehicle, i.e., a condition with a longer driving distance and a longer battery power consumption.

[0074] Step S302, determining the charge and discharge depth of the battery according to the historical operating condition type.

[0075] In step S302, for different historical operating condition types, the average battery power consumption of the historical operating conditions 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 corresponding charge and discharge depth determination method can also be different. For example, for conventional operating conditions, the charge and discharge depth of the battery in the current state can be determined based on the average battery power consumption under the historical operating conditions; for long-distance operating conditions, a pre-set charge and discharge depth can be used as the charge and discharge depth of the battery in the current state.

[0076] It should be noted that the use of a charge and discharge depth determination method corresponding to the historical operating condition type to determine the battery charge and discharge depth can make the battery charge and discharge depth determination more reasonable, meet the user's needs for vehicle use, and at the same time keep the battery charge and discharge within a reasonable range, while taking into account the battery life and improving the battery life.

[0077] In one embodiment, the historical operating condition type may be determined based on the driving distance and battery power consumption of the vehicle under the historical operating condition, such as Figure 4 As shown, the determination of the historical operating condition type may include the following steps S401 to S402: 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.

[0078] Step S402, 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, determine that the historical operating condition type is the second type.

[0079] As an example, when the battery power consumption of the vehicle under the historical operating condition is greater than 50% SOC (State of Charge) and the driving distance exceeds a certain distance, the historical operating condition can be determined as the second type of historical operating condition.

[0080] It should be noted that by determining the type of historical operating conditions based on the driving distance and battery power consumption, the charge and discharge depth determination method corresponding to the historical operating condition type can be used to determine the battery charge and discharge depth, so that the battery charge and discharge depth can be determined more reasonably, which can meet the user's needs for vehicle use, and at the same time, the battery charge and discharge is within a reasonable range, while taking into account the battery life and improving the battery service life.

[0081] The following introduces the determination of charge and discharge depth under two types of historical operating conditions.

[0082] like Figure 4 As shown, when the historical operating condition type is the first type, the charge and discharge depth of the battery can be determined by steps S4011 to S4012: Step S4011, determining an average power consumption under a first type of historical operating condition according to the battery power consumption under the historical operating condition; Step S4012, determining the charge and discharge depth of the battery according to the average power consumption.

[0083] In one example, the BMS may calculate the average battery power consumption of the vehicle under the first type of historical operating conditions over the past month to obtain the average power consumption; then, the ratio between the average power consumption and the rated capacity of the battery is calculated to obtain the depth of charge and discharge of the battery.

[0084] In another example, the BMS may calculate the charge and discharge depth of the vehicle under each first type of historical operating condition in the past month, and then calculate the average charge and discharge depth corresponding to the first type of historical operating condition in the past month, and use the average charge and discharge depth as the charge and discharge depth of the battery.

[0085] It should be noted that the battery power consumption under the first type of historical operating conditions can characterize the user's car usage habits. The battery charge and discharge depth can be determined based on the battery power consumption under the first type of historical operating conditions, so that the battery charge and discharge depth can meet the user's car usage needs, and then the battery charge and discharge is controlled within the charge and discharge range determined by the battery charge and discharge depth, which can not only ensure the battery life, but also improve the battery life.

[0086] like Figure 4 As shown, when the historical operating condition type is the second type, the charge and discharge depth of the battery can be determined by steps S4021 to S4022: Step S4021, obtaining the operating condition cycle of the second type of historical operating condition.

[0087] In step S4021, the operating cycle is the interval between the end of the previous second type of historical operating condition and the beginning of the next second type of historical operating condition. If there are multiple second type of historical operating conditions in the historical period, the operating cycle can be the average of the intervals between two adjacent second type of historical operating conditions.

[0088] Step S4022, when the second type of historical operating condition ends and reaches the first preset time, the charge and discharge depth of the battery is determined to be the first preset charge and discharge depth.

[0089] In step S4022, the first preset charge and discharge depth may be a preset fixed value, for example, 100% SOC. The first preset duration is less than the operating cycle, that is, the charge and discharge depth of the battery is adjusted after a period of time after the end of the previous second type of historical operating condition.

[0090] As an example, the second type of historical operating condition is a long-distance operating condition. By analyzing the time interval between long-distance operating conditions, it can be determined that the user will use the long-distance operating condition once a week (7 days, i.e., the operating condition cycle) on average. Then, on the 5th or 6th day (i.e., the first preset duration) after the user uses the long-distance operating condition, the battery's charge and discharge depth is adjusted to 100% SOC to meet the power demand of the long-distance operating condition.

[0091] Through step S4021 to step S4022, according to the user's demand for the long-distance operation of the vehicle, the charge and discharge depth of the vehicle is adjusted in advance to meet the power demand of the vehicle in the long-distance operation and reduce the number of charging times of the vehicle.

[0092] 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.

[0093] In one embodiment, Figure 5 As shown, the method for determining the charge and discharge depth of the battery may also include the following steps S501 to S502: Step S501, obtaining actual scene data of the vehicle and reference power consumption data of a reference vehicle in a scene matching the actual scene data.

[0094] In step S501, the actual scene data of the vehicle may include but is not limited to the use time of the vehicle (eg, holidays, seasons), and the use area of ​​the vehicle (eg, the southern area, the northern southern area).

[0095] In step S501, the reference vehicle may be a vehicle of the same model or type as the vehicle, and the reference power usage data may be the battery power usage of the reference vehicle in a scenario matching the actual scenario data.

[0096] 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 historical scenarios that match the actual scenario data is used as 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 in this winter.

[0097] Step S502, determining 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.

[0098] In one example, before the holiday arrives, or during the holiday, the BMS can use the vehicle power consumption data of the previous holiday as reference power consumption data, or use the vehicle power consumption data of the same holiday in history as reference power consumption data. If the vehicle does not have the vehicle power consumption data of the historical holiday, the battery charge and discharge depth can be automatically adjusted to 100% SOC, and the corresponding power consumption range is 3% SOC-100% SOC to meet the user's holiday vehicle demand; or, according to the vehicle power consumption data of other vehicles with the same model or the same vehicle demand (i.e., reference vehicles) on historical holidays, the vehicle's charge and discharge depth can be adjusted.

[0099] In another example, the BMS can also adjust the battery charge and discharge depth according to different seasons. For example, in winter, the temperature is lower and the battery capacity is reduced. At this time, according to the car use demand in winter in previous years, the battery charge and discharge depth can be appropriately increased to meet the user's winter car use needs. Similarly, in summer, the battery charge and discharge depth can be appropriately adjusted down.

[0100] Similar to the holiday scenario, when the vehicle has no historical winter power usage data, the battery charge and discharge depth can be adjusted to a fixed value, for example, 100% SOC. The vehicle's charge and discharge depth can also be adjusted based on historical winter power usage data of other vehicles of the same model or with the same vehicle usage needs (ie, reference vehicles).

[0101] In another example, the BMS can also adjust the battery charge and discharge depth in real time according to the vehicle's usage area. For example, in the southern region, where the temperature is higher, the BMS can appropriately reduce the battery charge and discharge depth; in the northern region, where the temperature is lower, the BMS can appropriately increase the battery charge and discharge depth; 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 vehicle's location.

[0102] It should be noted that by adjusting the battery charge and discharge depth of the vehicle in real time according to the actual scenario data of the vehicle to meet the user's real-time vehicle use needs, the battery charge and discharge depth is within a reasonable range, and then the battery charge and discharge is controlled within the charge and discharge range corresponding to the charge and discharge depth, the battery service life can be improved.

[0103] In one embodiment, Figure 6 As 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 S602: Step S601, obtaining the actual scene type where the vehicle is located; Step S602: 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.

[0104] In the above embodiment, the actual scene type of the vehicle includes at least one of the following: season, holiday, and area type.

[0105] In one example, the current time is a holiday, but there is no holiday in the month before the holiday (i.e., the historical period), that is, the actual scene type of the vehicle is inconsistent with the scene type in the historical period. At this time, the battery charge and discharge depth is automatically adjusted to 100% SOC (i.e., the second preset charge and discharge depth).

[0106] In another example, the current season is winter, and there is no historical usage data of the vehicle in winter during the historical period, then the BMS adjusts the charge and discharge depth of the vehicle in autumn, for example, adjusting the charge and discharge depth of the vehicle in autumn to 100% SOC.

[0107] There is also a possible example. The vehicle has been traveling 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 of the vehicle when traveling in the southern region is increased to 100% SOC.

[0108] The battery's charge and discharge depth is adjusted in real time according to the actual scenario type to meet the user's real-time vehicle needs.

[0109] In one embodiment, the BMS may also respond to a user's input operation on the vehicle usage condition and determine a target condition corresponding to the input operation; further, determine the charge and discharge depth of the battery according to the target condition.

[0110] In the above embodiment, the target operating condition may be the second type of operating condition. The user may operate the operating condition selection control in the vehicle to select the vehicle operating condition required by the user. For example, if the user temporarily needs to drive a long distance, the long-distance operating condition may 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.

[0111] It should be noted that real-time adjustment of the battery's charge and discharge depth based on the target operating conditions input by the user can enable the user to make independent decisions on the vehicle and enhance the flexibility of charge and discharge depth adjustment.

[0112] In one embodiment, due to the chemical characteristics of the battery, especially LiFePO4 (lithium iron phosphate) battery, the 20%-80% charge and discharge interval is a smooth voltage curve, such as Figure 7 As shown in the static voltage curve, long-term use of the voltage in this range will cause the BMS system to be unable to accurately determine the battery power. For example, if the battery's current power is 50% SOC, the BMS system may mistakenly judge it as 20% SOC, resulting in false power.

[0113] In order to meet the needs of users for long-distance vehicle use and to calibrate the battery voltage for the BMS system, in an embodiment of the present application, the battery is fully charged every second preset time period to accurately determine the current remaining power and battery status of the battery, thereby avoiding problems such as overcharging or over-discharging of the battery that may reduce the battery life.

[0114] It should be noted that, in the embodiment of the present application, the correlation between the charging rate and the SOC can be determined by Table 1, and can also be adjusted according to real-time collected data during actual use.

[0115] Table 1

[0116] 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: Step S801, determining a target charge and discharge interval of the battery according to the charge and discharge depth of the battery; 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] In another example, there is a correlation between the charge and discharge depth of the battery and the charge and discharge interval. After obtaining the charge and discharge depth of the battery, the BMS can determine the charge and discharge interval corresponding to the charge and discharge depth based on the correlation. For example, when the charge and discharge depth is less than 50% SOC, the charge and discharge interval is the first interval, such as 30% SOC-80% SOC; when the charge and discharge depth 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 charge and discharge depth 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 charge and discharge depth 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.

[0122] It should be noted that the above-mentioned correlation between the charge and discharge depth and the charge and discharge range is only an example. In actual use, the above-mentioned correlation can be adjusted according to the performance and operating conditions of the vehicle.

[0123] In one embodiment, Fig. 9 As shown, step S802, i.e. controlling the battery to charge and discharge within the target charge and discharge interval, may include the following steps S901 to S904: Step S901, obtaining battery temperatures at multiple locations in the battery; Step S902, determining temperature difference index data corresponding to the battery according to the battery temperatures at multiple positions; 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; Step S904, controlling the battery to charge and discharge within the charge and discharge interval according to the target charge and discharge current.

[0124] It should be noted that different users have different car-using habits. When the battery is charged and discharged with a large current, the battery temperature will rise, and the heat dissipation capacity of the cells in different parts of the battery is different, that is, there are differences in the temperature of different parts of the battery. Generally, the higher the battery temperature, the stronger the dynamics of the lithium ions in the battery, and the stronger the charging and discharging capacity. If the temperature difference between different parts of the battery is too large, the BMS system will control the charging and discharging current of the battery based on the higher temperature or the temperature average as an input item, thereby causing the cells in the lower temperature parts to overload, accelerate aging, and increase the consistency difference of the cells between modules. In this regard, in an embodiment of the present application, the charge and discharge current of the battery is discounted according to the temperature difference index data, that is, the charge and discharge current of the battery is reduced to reduce the consistency difference of the cells in the battery.

[0125] In the above embodiment, the temperature difference index data may include a target temperature difference value, where 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 value is greater than a preset temperature difference threshold value.

[0126] As an example, the position in the battery can be the position of the battery pole, and the temperature at different positions of the battery can be the temperature at different positions of the battery large surface. The battery large surface is the surface with the largest area among all surfaces of the battery; if the battery has multiple largest surfaces, any one of the multiple largest surfaces is selected as the battery large surface.

[0127] In a scenario where multiple temperature sensors are dispersed inside the battery pack, each temperature sensor collects the temperature at a location. At this time, the BMS can obtain the temperature collected by each temperature sensor, calculate the difference between the temperatures collected by any two of the multiple temperature sensors, and determine the maximum temperature difference as the target temperature difference.

[0128] In the scenario where the position in the battery is the pole position of the battery, the BMS can obtain the pole temperature of each pole position in the battery, and then convert the pole temperature into the temperature corresponding to each position based on a preset correlation between the pole temperature and the cell temperature.

[0129] It should be noted that in the battery, the collection point of the cell temperature is usually set on the top cover of the battery. The pole temperature on the top cover cannot directly reflect the temperature difference of the large surface of the cell. Therefore, it is necessary to combine the simulation and the actual measurement to perform the conversion. However, due to the different structures of the batteries (for example, single large surface water cooling structure, double large surface water cooling structure, bottom water cooling structure, etc.), there will be differences in the above temperature conversion logic, which will reduce the accuracy of the battery large surface temperature detection. In this regard, in an embodiment of the present application, the conversion between the pole temperature and the large surface temperature of the battery is achieved through empirical values, that is, the preset correlation between the pole temperature and the cell temperature is 0.75T-4, where T is the pole temperature.

[0130] Furthermore, after collecting the battery temperatures at multiple battery positions, the battery temperature difference at different positions at the same time can be calculated, and the maximum value of the temperature difference can be used as the target temperature difference; then, the target temperature difference is compared with the preset temperature difference threshold. If the target temperature difference is greater than the preset temperature difference threshold and the BMS system heating circuit is not turned on, the battery charge and discharge current is discounted, where the discounted charge and discharge current value = mapping*K, where mapping is the original charge current or discharge current of the battery, and K is the discount factor.

[0131] It should be noted that in the above embodiment, the discount coefficient K can be pre-set or adjusted by collecting data in historical operating conditions; the current release value is close to the charging and discharging current value in the user's operating condition and is not greater than the protection coefficient (pre-set, such as 0.95).

[0132] In addition, it should be noted that by discounting 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 caused by the temperature difference can be reduced.

[0133] In the above embodiment, the temperature difference index data may also include a target temperature change rate, which 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 collection time interval between T1 and T2.

[0134] It should be noted that in the embodiment of the present application, the charge and discharge current of the battery is discounted according to the rate of change of the battery temperature, which can reduce the consistency difference of the battery cells in the battery caused by the sudden rise and fall of the ambient temperature of the battery.

[0135] In one embodiment, the BMS may reduce the charge and discharge current of the battery according to the correlation between the temperature change rate interval and the discount coefficient and the target temperature change rate.

[0136] In the above embodiment, the discount coefficient is a positive number less than or equal to 1. The BMS may determine the discount coefficient corresponding to the target temperature change rate according to the correlation between the temperature change rate interval and the discount coefficient, and then adjust the charge and discharge current of the battery by the discount coefficient.

[0137] In the embodiment 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℃ / s, the discount coefficient K=1; when 5℃ / s≤A<10℃ / s, the discount coefficient K=0.9; when 10℃ / s≤A, K=0.8.

[0138] It should be noted that the use of a discount coefficient that matches the temperature change rate to adaptively discount the battery's charge and discharge current can reduce the impact of harsh environments on battery life and improve the battery's service life.

[0139] In another embodiment, the temperature difference index data includes a target temperature difference and a 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 battery charge and discharge current needs to be discounted. At this time, the BMS further detects the target temperature change rate, and then determines the discount coefficient for the battery charge and discharge current based on the temperature change rate range in which the target temperature change rate is located.

[0140] This completes the explanation of the method provided in the embodiments of the present application.

[0141] Fig.10 The overall flow chart of the method provided in the embodiment of the present application is shown as follows: Fig.10 As shown, the method includes the following steps S1001 to S1006: Step S1001, obtaining vehicle usage data of the vehicle under historical working conditions; Step S1002, determining the historical operating condition type according to the vehicle usage data, if the historical operating condition type is a long-distance operating condition, executing step S1005, otherwise executing step S1003; Step S1003, determining the charge and discharge depth of the battery according to the battery power consumption in the vehicle usage data; Step S1004, determining the charge and discharge interval of the battery according to the set battery discharge lower limit value and charge and discharge depth, and controlling the battery to charge and discharge within the charge and discharge interval; Step S1005, fully charging the battery; Step S1006, determining a 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 the charge and discharge depth.

[0142] In the embodiment of the present application, the depth of charge and discharge of the battery is adjusted in real time in combination with the historical operating conditions of the vehicle, thereby taking into account both the battery life and the battery life. In addition, in the embodiment of the present application, the charge and discharge current is also calculated and adjusted in real time to avoid overloading the battery and increase the battery life.

[0143] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0144] In one embodiment, Fig.11 The schematic diagram of the battery management system is shown. Fig.11 It can be seen that the battery management system includes: a sampling circuit 1101 and a controller 1102 .

[0145] 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, wherein the vehicle usage data includes the driving distance of the vehicle and the battery power consumption; 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.

[0146] In the embodiment of the present application, the controller is combined with the sampling circuit to implement the method for determining the battery charge and discharge depth provided in the embodiment of the present application.

[0147] In the embodiment of the present application, the sampling circuit may be composed of multiple data acquisition components, wherein the data acquisition components may include but are not limited to a positioning component, a power detection component, a temperature acquisition component, etc. In the embodiment of the present application, the sampling circuit may collect various data required in the process of implementing the method provided in the embodiment of the present application, such as the driving distance of the vehicle, the battery power consumption, the start and end time of the vehicle driving, the temperature at different positions of the battery, etc.

[0148] The controller can implement the data processing process in the method provided in the embodiment of the present application, including but not limited to the processing of vehicle usage data under historical operating conditions, determination of historical operating condition types, determination and adjustment of battery charge and discharge depth, full charge and discharge operations of the battery, and battery charge and discharge control.

[0149] It should also be noted that the process of data acquisition by the sampling circuit and the process of battery depth determination, adjustment and battery charge and discharge control by the controller have been introduced above and will not be repeated here.

[0150] In one embodiment, the present application further provides a battery device, which includes a battery and the above-mentioned battery management system, and the battery management system can adjust the charge and discharge depth of the battery, and control the charge and discharge of the battery.

[0151] In one embodiment, the present application further provides an electric device, which may include the battery device in the above embodiment. As an example, the electric device may be a vehicle, such as an electric car driven by a battery, or other vehicles including a battery and a battery management system.

[0152] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0153] The functional blocks shown in the above structural block diagram 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 on a transmission medium or a communication link via a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0154] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0155] The above describes various aspects of the present application with reference to the flowcharts and / or block diagrams of the method, device, medium and product for determining the depth of charge and discharge of a battery according to the embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of boxes in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these 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 boxes 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 can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall 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; When the battery is charged and discharged, the battery is controlled to be charged and discharged within the target charge and discharge interval.

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 control the battery to charge and discharge within the target charge and discharge interval when the battery is being charged and discharged.

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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