A control method, device and battery management system for improving the endurance of electric vehicles

Abstract

The present invention provides a control method for improving the battery life of an electric vehicle, including: when a battery management system receives a diagnostic instruction representing the battery life requirement, it combines a preset battery configuration relationship correspondence table to parse out the battery life mode and its corresponding battery life level, and further obtains the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode and a winter mode; the battery life level is one of a high battery life level, a medium battery life level and a low battery life level; according to the battery discharge depth to be modified, the power battery is configured to achieve an improvement in the battery life of the electric vehicle. The present invention is implemented to improve the vehicle's battery life by changing the battery discharge depth, which not only meets the normal battery life requirement, but also meets the environmental battery life and emergency rescue requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a control method and system for improving the endurance of an electric vehicle. Background Art

[0002] Pure electric vehicles, with their zero pollution and zero emissions, can effectively alleviate problems such as energy shortage and environmental pollution in my country.

[0003] As more and more pure electric vehicles are launched on the market, the defects of electric vehicle range anxiety are gradually exposed. The defects are: (1) Environmental endurance: Due to environmental influences, the endurance in northern winter is relatively low; (2) Emergency rescue: In an emergency breakdown state, it is impossible to get energy replenishment in time like fuel vehicles; (3) Mileage upgrade: After old users of low-range version have driven for a period of time, they want to upgrade to high-range version.

[0004] In recent years, with the development of battery and motor technology, the range of electric vehicles has been greatly improved. At present, the common means of improving the range of electric vehicles include weight reduction, resistance reduction, and efficiency improvement, but these methods can only be optimized on the original basis, so the effect of improving the range is not obvious, and therefore it does not fundamentally solve the problem.

[0005] Since the range of an electric vehicle is mainly determined by the power source, and the power source of an electric vehicle is a power battery, and the depth of battery discharge directly affects the range of the vehicle, it is necessary to propose a control method for improving the range of an electric vehicle, which can improve the vehicle's range by changing the battery discharge depth, and can not only meet conventional range requirements, but also meet environmental range and emergency rescue requirements. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a control method and system for improving the endurance of electric vehicles, which improves the vehicle endurance by changing the battery discharge depth, thereby not only meeting conventional endurance requirements, but also meeting environmental endurance and emergency rescue requirements.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a control method for improving the cruising range of an electric vehicle, the method comprising the following steps:

[0008] S1. When receiving a diagnostic instruction indicating a battery life requirement, the battery management system analyzes the battery life mode and its corresponding battery life level in combination with a preset battery configuration relationship correspondence table, and further obtains the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode, and a winter mode; and the battery life level is one of a high battery life level, a medium battery life level, and a low battery life level;

[0009] S2. According to the battery discharge depth to be modified, the power battery is configured to improve the cruising range of the electric vehicle. The power battery is configured to improve the cruising range of the electric vehicle.

[0010] Wherein, the step S1 specifically includes:

[0011] If the analyzed endurance mode is the normal mode and the endurance level is the high endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the remaining power range of the first battery is the battery discharge depth to be modified;

[0012] If the analyzed endurance mode is the normal mode and the endurance level is the medium endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the second battery remaining power range is the battery discharge depth to be modified;

[0013] If the analyzed endurance mode is the normal mode and the endurance level is the low endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the third battery remaining power range is the battery discharge depth to be modified;

[0014] Among them, the first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence.

[0015] Wherein, the step S1 further comprises:

[0016] If the resolved endurance mode is the rescue mode and the endurance level is the high endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the fourth battery remaining power range is the battery discharge depth to be modified;

[0017] If the resolved endurance mode is the rescue mode and the endurance level is the medium endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the fifth battery remaining power range is the battery discharge depth to be modified;

[0018] If the resolved endurance mode is the rescue mode and the endurance level is the low endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the sixth battery remaining power range is the battery discharge depth to be modified;

[0019] Among them, the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all limit value areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence.

[0020] The lower limits of the fourth battery remaining power range, the fifth battery remaining power range, and the sixth battery remaining power range are all smaller than the lower limits of the first battery remaining power range, the second battery remaining power range, and the third battery remaining power range;

[0021] The upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range;

[0022] The upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range;

[0023] An upper limit value of the sixth battery remaining power range is the same as an upper limit value of the third battery remaining power range.

[0024] Wherein, the step S1 further comprises:

[0025] If the analyzed endurance mode is the winter mode and the endurance level is the high endurance level, then further in the preset battery configuration relationship correspondence table, the remaining power range of the seventh battery is obtained as the battery discharge depth to be modified;

[0026] If the analyzed endurance mode is the winter mode and the endurance level is the medium endurance level, then further in the preset battery configuration relationship correspondence table, the remaining power range of the eighth battery is obtained as the battery discharge depth to be modified;

[0027] If the analyzed endurance mode is the winter mode and the endurance level is the low endurance level, then further in the preset battery configuration relationship correspondence table, a ninth battery remaining power range is obtained as the battery discharge depth to be modified;

[0028] Among them, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all limit value areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence.

[0029] The lower limits of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range, and the ninth battery remaining power range are all the same;

[0030] The upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range;

[0031] The upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and less than the upper limit value of the first battery remaining power range;

[0032] An upper limit value of the ninth battery remaining power range is greater than an upper limit value of the third battery remaining power range, and less than an upper limit value of the second battery remaining power range.

[0033] The diagnostic instruction is mapped from the endurance requirement initiated locally or remotely by the user after being tested under predetermined conditions and safety verified.

[0034] Among them, the battery life requirement includes battery life package information, a VIN code for finding the corresponding vehicle, and validity information for characterizing the battery life time purchased by the user; wherein, the battery life package information includes various battery life modes and their corresponding battery life levels; the purchased battery life time includes single time, monthly package, quarterly package, annual package and permanent.

[0035] Wherein, the predetermined conditions include vehicle detection conditions and vehicle status detection conditions; Wherein,

[0036] The vehicle detection condition is that the VIN code of at least one vehicle is the same as the VIN code carried by the endurance requirement;

[0037] The vehicle state detection condition is that the vehicle simultaneously has all the states of a vehicle speed of 0, a gear position of P, and a battery voltage less than a predetermined voltage threshold.

[0038] Wherein, the method further comprises:

[0039] The vehicle controller periodically receives the battery configuration signal sent by the battery management system within a predetermined time range, and when it is determined that the battery configuration signal can be received in each cycle and the values ​​carried by the received battery configuration signal are all normal values, the total cruising range of the electric vehicle is obtained in a preset cruising range relationship correspondence table; wherein, the battery configuration signal is obtained by the battery management system by looking up the table in the preset battery configuration relationship correspondence table based on the battery discharge depth to be modified.

[0040] Wherein, the method further comprises:

[0041] If the vehicle controller determines that the value carried by the battery configuration signal received in a certain period is an abnormal value or determines that the battery configuration signal received in a certain period is lost, the battery configuration signal carrying a normal value received in the previous period is extracted for replacement.

[0042] Wherein, the method further comprises:

[0043] If the vehicle controller has not received the battery configuration signal sent by the battery management system within the predetermined time range and has not pre-stored the total cruising range of the electric vehicle, it will be determined that a fault has occurred and the fault information will be recorded.

[0044] Wherein, the method further comprises:

[0045] The instrument cluster receives the actual remaining battery power calculated by the battery management system after completing the battery configuration, and receives the total cruising range of the electric vehicle obtained by the vehicle controller, and further combines and displays the received actual remaining battery power and the total cruising range of the electric vehicle.

[0046] The embodiment of the present invention further provides a battery management system, including:

[0047] A multi-mode battery discharge depth acquisition unit is used to, when receiving a diagnostic instruction representing a battery life requirement, analyze the battery life mode and its corresponding battery life level in combination with a preset battery configuration relationship correspondence table, and further obtain the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode and a winter mode; and the battery life level is one of a high battery life level, a medium battery life level and a low battery life level;

[0048] The range improvement configuration unit is used to configure the power battery according to the battery discharge depth to be modified, so as to improve the range of the electric vehicle.

[0049] The multi-mode battery discharge depth acquisition unit includes a normal mode battery discharge depth acquisition module, a rescue mode battery discharge depth acquisition module and a winter mode battery discharge depth acquisition module;

[0050] The normal mode battery discharge depth acquisition module is used for, if the parsed battery life mode is the normal mode and the battery life level is the high battery life level, further obtaining the first battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the parsed battery life mode is the normal mode and the battery life level is the medium battery life level, further obtaining the second battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the parsed battery life mode is the normal mode and the battery life level is the low battery life level, further obtaining the third battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein, the first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence;

[0051] The rescue mode battery discharge depth acquisition module is used to, if the resolved battery life mode is the rescue mode and the battery life level is the high battery life level, further obtain the fourth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved battery life mode is the rescue mode and the battery life level is the medium battery life level, further obtain the fifth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved battery life mode is the rescue mode and the battery life level is the low battery life level, further obtain the sixth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein, the fourth battery remaining power range, the fifth ... fourth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fourth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery The remaining power range and the sixth battery remaining power range are both limit areas composed of the remaining power of the batteries, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; the lower limit values ​​of the fourth battery remaining power range, the fifth battery remaining power range, and the sixth battery remaining power range are all smaller than the lower limit values ​​of the first battery remaining power range, the second battery remaining power range, and the third battery remaining power range; the upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range; the upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range; the upper limit value of the sixth battery remaining power range is the same as the upper limit value of the third battery remaining power range;

[0052] The winter mode battery discharge depth acquisition module is used to, if the resolved endurance mode is the winter mode and the endurance level is the high endurance level, further obtain the seventh battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved endurance mode is the winter mode and the endurance level is the medium endurance level, further obtain the eighth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved endurance mode is the winter mode and the endurance level is the low endurance level, further obtain the ninth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are The ranges are all limit areas composed of the remaining battery power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence; the lower limit values ​​of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all the same; the upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range; the upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and is less than the upper limit value of the first battery remaining power range; the upper limit value of the ninth battery remaining power range is greater than the upper limit value of the third battery remaining power range, and is less than the upper limit value of the second battery remaining power range.

[0053] An embodiment of the present invention further provides a control device for improving the driving range of an electric vehicle, including the aforementioned battery management system.

[0054] Implementing the embodiments of the present invention has the following beneficial effects:

[0055] 1. The present invention is based on the battery management system. When receiving a diagnostic instruction that represents the endurance requirement, the battery management system combines the battery configuration relationship correspondence table to parse the endurance mode and its corresponding endurance level, and obtains the battery discharge depth to be modified to configure the power battery. At the same time, the battery configuration signal is generated based on the battery discharge depth to map the endurance mileage. Therefore, the battery discharge depth can be changed through the diagnostic instruction to improve the vehicle endurance, and the endurance mileage is mapped according to the battery configuration signal, so as to meet not only the conventional endurance requirements (such as the conventional mode), but also the environmental endurance (such as the winter mode) and emergency rescue requirements (such as the rescue mode);

[0056] 2. The present invention achieves three types of endurance mileages, low, medium and high, by limiting the battery discharge depth in different endurance modes, so that users can choose from a variety of endurance versions;

[0057] 3. The battery life requirement of the present invention can be initiated locally or remotely by the user, making the operation more convenient. At the same time, the usage time (such as single time, monthly, quarterly, annual and permanent) can be selected more flexibly according to the needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0059] Figure 1 A flow chart of a control method for improving the driving range of an electric vehicle provided in Embodiment 1 of the present invention;

[0060] Figure 2 This is an application scenario diagram of battery discharge depth intervals corresponding to different endurance modes in a control method for improving the endurance of an electric vehicle provided in Embodiment 1 of the present invention;

[0061] Figure 3 A schematic diagram of the structure of a battery management system provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0062] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0063] like Figure 1 As shown in the figure, a control method for improving the driving range of an electric vehicle is provided in the first embodiment of the present invention, and the method comprises the following steps:

[0064] Step S1, when the battery management system receives a diagnostic instruction representing a battery life requirement, it analyzes the battery life mode and its corresponding battery life level in combination with a preset battery configuration relationship correspondence table, and further obtains the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode and a winter mode; and the battery life level is one of a high battery life level, a medium battery life level and a low battery life level;

[0065] Step S2: configuring the power battery according to the battery discharge depth to be modified to improve the cruising range of the electric vehicle.

[0066] The specific process is as follows: in step S1, first, the user initiates a battery life requirement locally or remotely, and the battery life requirement is mapped to obtain a diagnostic instruction after being tested under predetermined conditions and safety verified, and the obtained diagnostic instruction is further sent to the battery management system.

[0067] The battery life requirements include battery life package information (including each battery life mode and its corresponding battery life levels), VIN code for finding the corresponding vehicle, and validity information for indicating the battery life purchased by the user (such as single time, monthly, quarterly, annual, and permanent). Battery life modes include normal mode, rescue mode, and winter mode; battery life levels include high battery life level, medium battery life level, and low battery life level.

[0068] The predetermined conditions include vehicle detection conditions and vehicle status detection conditions. The vehicle detection condition is that at least one of the vehicles has the same VIN code as the VIN code carried by the endurance requirement; the vehicle status detection condition is that the vehicle has all the conditions of 0 speed, P gear and battery voltage less than the predetermined voltage threshold at the same time.

[0069] That is, after the user initiates a range demand locally or remotely, the corresponding vehicle is searched through the VIN code carried by the range demand; if the corresponding vehicle cannot be found, the failure and reason are directly fed back; if it can be found, the vehicle status is detected. As long as the vehicle meets the conditions of 0 speed, P gear and battery voltage less than a predetermined voltage threshold (such as 11V~16V), that is, the power battery is in a non-working state, the battery management system is further verified for safety (allowing or prohibiting battery configuration). If it passes (that is, battery configuration is allowed), the range demand is converted into a corresponding diagnostic instruction, which carries the range package information.

[0070] In one embodiment, the diagnostic instruction is 2E 0101 XX 2E 0102 YY, wherein 2E represents a write instruction, 0101 represents a write register for the battery life mode, 0102 represents a write register for the battery life level, XX represents a write value for the battery life mode, and YY represents a write value for the battery life level.

[0071] Secondly, when the battery management system receives a diagnostic instruction that represents the endurance requirement, it parses the endurance mode and its corresponding endurance level in the pre-designed battery configuration relationship correspondence table (as shown in Table 1).

[0072] Table 1

[0073]

[0074]

[0075] In Table 1, DID 0101 represents the write register of the battery life mode; DID 0102 represents the write register of the battery life level; 0x00 to 0x02 are all write values.

[0076] It can be seen that by reading 0101 XX and 0102 YY in the diagnostic instructions, the corresponding endurance mode and its corresponding endurance level can be parsed in Table 1. Since the endurance modes include normal mode, rescue mode and winter mode, and the endurance levels include high endurance level, medium endurance level and low endurance level, it is necessary to find the corresponding battery discharge depth in Table 1 according to the specific endurance mode and its corresponding endurance level. Therefore, the endurance level can be further refined according to the three endurance modes for analysis. The specific process is as follows:

[0077] (1) Normal mode:

[0078] a. High endurance level: the remaining power range of the first battery obtained in Table 1 is the battery discharge depth to be modified;

[0079] b. Medium endurance level: the remaining power range of the second battery obtained in Table 1 is the battery discharge depth to be modified;

[0080] c. Low endurance level, the remaining power range of the third battery obtained in Table 1 is the battery discharge depth to be modified;

[0081] Among them, the first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence.

[0082] Taking Table 1 as an example, the remaining power range of the first battery is [SOC1, SOC H1 ], the remaining power range of the second battery is [SOC1, SOC M1 ], the remaining power range of the third battery is [SOC1, SOC L1 ], it can be seen that the three have a common lower limit value SOC1, and the upper limit value of the three is SOC H1 >SOC M1 >SOC L1 .

[0083] (2) Rescue mode:

[0084] a. High endurance level: the remaining power range of the fourth battery obtained in Table 1 is the battery discharge depth to be modified;

[0085] b. Medium endurance level: the fifth battery remaining power range obtained in Table 1 is the battery discharge depth to be modified;

[0086] c. Low endurance level, the remaining power range of the sixth battery obtained in Table 1 is the battery discharge depth to be modified;

[0087] Among them, the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all limit areas composed of the battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence; the lower limit values ​​of the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all smaller than the lower limit values ​​of the first battery remaining power range, the second battery remaining power range and the third battery remaining power range; the upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range; the upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range; the upper limit value of the sixth battery remaining power range is the same as the upper limit value of the third battery remaining power range.

[0088] Taking Table 1 as an example, the remaining power range of the fourth battery is [SOC0, SOC H1 ], the fifth battery remaining power range is [SOC0, SOC M1 ], the remaining power range of the sixth battery is [SOC0, SOC L1 ], it can be seen that the three have a common lower limit value SOC0, and the upper limit value of the three is SOC H1 >SOC M1 >SOC L1 .

[0089] At the same time, the lower limit SOC0 of the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range is less than the lower limit SOC1 of the first battery remaining power range, the second battery remaining power range and the third battery remaining power range; the upper limit SOC H1 The upper limit value SOC of the first battery remaining power range H1 Same; the upper limit value SOC of the fifth battery remaining power range M1 The upper limit value SOC of the second battery remaining power range M1 Same; the upper limit value SOC of the sixth battery remaining power range L1 The upper limit value SOC of the third battery remaining power range L1 same.

[0090] (3) Winter mode:

[0091] a. High endurance level: the remaining power range of the seventh battery obtained in Table 1 is the battery discharge depth to be modified;

[0092] b. Medium endurance level: the remaining power range of the eighth battery obtained in Table 1 is the battery discharge depth to be modified;

[0093] c. Low endurance level, the remaining power range of the ninth battery obtained in Table 1 is the battery discharge depth to be modified;

[0094] Among them, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all limit areas composed of the battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence; the lower limit values ​​of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all the same; the upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range; the upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and is less than the upper limit value of the first battery remaining power range; the upper limit value of the ninth battery remaining power range is greater than the upper limit value of the third battery remaining power range, and is less than the upper limit value of the second battery remaining power range.

[0095] Taking Table 1 as an example, the remaining power range of the seventh battery is [SOC1, SOC H2 ], the remaining power range of the eighth battery is [SOC1, SOC M2 ], the remaining power range of the ninth battery is [SOC1, SOC L2 ], it can be seen that the three have a common lower limit value SOC1, and the upper limit value of the three is SOC H2 >SOC M2 >SOC L2 .

[0096] At the same time, the lower limits of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all the same SOC1; the upper limit of the seventh battery remaining power range is SOC H2 > Upper limit value SOC of the first battery remaining power range H1 ; The upper limit value SOC of the eighth battery remaining power range M2 >The upper limit value SOC of the second battery remaining power range M1 and < the upper limit value SOC of the first battery remaining power range H1 ; The upper limit value SOC of the ninth battery remaining power range L2 >The upper limit value SOC of the third battery remaining power range L1 and < the upper limit value SOC of the second battery remaining power range M1 .

[0097] like Figure 2 As shown in the figure, it is an application scenario diagram of different endurance modes corresponding to the battery discharge depth range. Figure 2 The size of the area corresponding to the battery discharge depth of each endurance level in the above three endurance modes can be reflected.

[0098] In step S2, the power battery is configured according to the battery discharge depth to be modified to improve the range of the electric vehicle. For example, in Table 1, the ninth battery remaining power range [SOC1, SOC L2 ], the battery management system directly changes the battery discharge depth of the power battery to [SOC1, SOC L2 ], thereby improving the mileage of electric vehicles during low-range conditions in winter.

[0099] In the embodiment of the present invention, the battery management system will obtain the battery configuration signal based on the battery discharge depth to be modified in the preset battery configuration relationship corresponding table (such as Table 1) and send it to the vehicle controller VCU for matching the corresponding total cruising range. In view of the fact that the battery configuration signal may be lost or have invalid values ​​during the transmission process, it is necessary to analyze the cruising range matching process of the vehicle controller in detail, as follows:

[0100] (I) The vehicle controller periodically (once every 5 seconds) receives the battery configuration signal sent by the battery management system within a predetermined time range (such as 30 seconds), and when it is determined that the battery configuration signal can be received in each cycle and the values ​​carried by the received battery configuration signal are all normal values, the total cruising range of the electric vehicle is obtained in the preset cruising range relationship correspondence table (as shown in Table 2).

[0101] Table 2

[0102]

[0103] (II) If the vehicle controller does not receive the battery configuration signal sent by the battery management system within a predetermined time range (such as 30 seconds) and does not pre-store the total cruising range of the electric vehicle, it is determined that a fault has occurred and the fault information is recorded. It should be noted that if the vehicle controller pre-stores the total cruising range of the electric vehicle, the pre-stored total cruising range can be extracted as the current total cruising range, that is, the previous total cruising range is used.

[0104] (III) The vehicle controller periodically (once every 5 seconds) receives the battery configuration signal sent by the battery management system within a predetermined time range (such as 30 seconds), and if it is determined that the value carried by the battery configuration signal received in a certain period is an abnormal value or it is determined that the battery configuration signal received in a certain period is lost, the battery configuration signal carrying the normal value received in the previous period is extracted and replaced, and then the total cruising range is obtained in Table 2 according to the replaced battery configuration signal, that is, the existing or pre-stored total cruising range is used.

[0105] In an embodiment of the present invention, after the battery management system changes the battery discharge depth, it will obtain the actual remaining battery power (for example, represented by the BMS_BattSocDisp signal value), and send the actual remaining battery power to the instrument cluster ICM in real time through the CAN bus for displaying the remaining battery power information. At the same time, the total cruising range matched by the vehicle controller is sent to the instrument cluster ICM in real time through the CAN bus for displaying the total cruising range. Therefore, the method further includes: the instrument cluster receives the actual remaining battery power calculated by the battery management system after completing the battery configuration, and receives the total cruising range of the electric vehicle obtained by the vehicle controller, and further combines the received actual remaining battery power and the total cruising range of the electric vehicle for display.

[0106] Taking remote control as an example, the application scenario of a control method for improving the endurance of an electric vehicle in Embodiment 1 of the present invention is further described:

[0107] The first step is for users to remotely view the battery life package through the mobile phone APP. After selecting and successfully paying, the APP will send the package information to the backend server. Among them, electric vehicles will regularly push upgrade battery life reminder messages and display QR codes. Users can scan the code to download the APP through mainstream scanning methods such as WeChat.

[0108] Step 2: After the backend server receives the battery life requirement (which must include VIN code information and validity information) initiated by the APP, it sends the requirement information to the T-BOX. It should be noted that if the battery discharge depth is modified successfully and the package is not permanently valid, the backend will start timing, and when the timing ends, the battery life information before the modification will be sent to the T-BOX, and the original battery life configuration will be modified through the same path and method.

[0109] Step 3. After receiving the package information, T-BOX first searches for the corresponding vehicle through the VIN code. If the corresponding vehicle cannot be found, it will directly feedback the failure and the reason. If it can be found, it will detect the vehicle status and determine that the conditions are met (the vehicle speed is 0 && the gear is P && the vehicle's battery maintains a low voltage), and then conduct safety authentication with the battery management system. After further authentication, it will initiate a diagnostic command to the battery management system. If the conditions are not met, it will report the reason and suspend the task, and determine whether the conditions are met again after a period of time.

[0110] Step 4: The battery management system designs two registers to store the write values ​​of the endurance mode and endurance level, such as endurance mode DID 0101 and endurance level DID 0102. At this time, if the remote safety authentication is not passed, rewriting the values ​​of the two registers is prohibited; if the remote safety authentication is passed, the battery management system receives the diagnostic instruction and executes it and gives feedback, and feedback information is given on whether the rewriting is successful or failed.

[0111] When the two registers DID are written for the first time, the default is the conventional high-endurance configuration, that is, (endurance mode DID 0101 = 0x00, endurance level DID 0102 = 0x00); after the rewrite is successful, the battery management system finds the corresponding battery discharge depth in Table 1 for the endurance mode DID 0101 and the endurance level DID 0102 according to certain rules and configures the power battery.

[0112] After the battery management system changes the battery discharge depth, it uses the remaining power display BMS_BattSocDisp to obtain the actual remaining battery power. At the same time, the remaining power display signal BMS_BattSocDisp is sent to the instrument cluster ICM in real time through the CAN bus to display the remaining battery power information.

[0113] It is understandable that the battery management system will also map the battery configuration signal BMS_BattTypeSt and the corresponding value it carries according to the battery discharge depth, and send the battery configuration signal BMS_BattTypeSt and the corresponding value it carries to the T-BOX in real time through the CAN bus and upload it to the big data platform for monitoring and storing the current battery configuration information; and send the battery configuration signal BMS_BattTypeSt and the corresponding value it carries to the vehicle controller VCU in real time through the CAN bus for matching the corresponding total cruising range.

[0114] Step 5. The vehicle controller VCU selects the corresponding total cruising range in Table 2 according to the battery configuration signal BMS_BattTypeSt sent by the battery management system and the corresponding value it carries.

[0115] If the vehicle controller VCU has not received the battery configuration signal BMS_BattTypeSt sent by the battery management system within the preset time range of 30S, and the NVM (non-volatile memory) storing the value of the battery configuration signal is empty, the default remaining cruising range (for example, represented by the VCU_VehRng signal value) is VCU_VehRng=1000, the instrument treats it as an invalid value, the cruising range is displayed as "-", and a fault is determined to have occurred, and the fault information is recorded.

[0116] If the vehicle controller VCU receives the battery configuration signal sent by the battery management system every 5 seconds within the predetermined time range of 30 seconds, and the values ​​carried by the battery configuration signal are all normal values ​​(i.e., valid values), then randomly extract the value carried by the battery configuration signal of a certain period and select the corresponding total cruising range in Table 2.

[0117] If the vehicle controller VCU receives the battery configuration signal sent by the battery management system every 5 seconds within the predetermined time range of 30 seconds, and the value carried by the battery configuration signal received in a certain period is an abnormal value, the normal value of the previous period is used, that is, the battery configuration signal carrying the normal value received in the previous period is extracted and replaced, and then the total cruising range is obtained in Table 2 according to the replaced battery configuration signal.

[0118] If the vehicle controller VCU receives the battery configuration signal sent by the battery management system every 5 seconds within the predetermined time range of 30 seconds, and the battery configuration signal received in a certain period is lost, the existing value of NVM can be called, that is, the existing or pre-stored total cruising range can be used; or the battery configuration signal with a normal value received in the previous period can be extracted for replacement, and then the total cruising range can be obtained in Table 2 according to the replaced battery configuration signal.

[0119] Step 6. The instrument cluster ICM receives the actual remaining battery power from the battery management system and the total cruising range from the vehicle controller VCU. The instrument displays the information according to the formula: Remaining mileage = actual remaining battery power × total cruising range.

[0120] like Figure 3 As shown, a battery management system is provided in Embodiment 2 of the present invention, including:

[0121] The multi-mode battery discharge depth acquisition unit 110 is used to parse the battery life mode and its corresponding battery life level in combination with the preset battery configuration relationship correspondence table when receiving the diagnostic instruction representing the battery life requirement, and further obtain the battery discharge depth to be modified; wherein the battery life mode is one of the normal mode, the rescue mode and the winter mode; and the battery life level is one of the high battery life level, the medium battery life level and the low battery life level;

[0122] The cruising range improvement configuration unit 120 is used to configure the power battery according to the battery discharge depth to be modified, so as to improve the cruising range of the electric vehicle.

[0123] The multi-mode battery discharge depth acquisition unit 110 includes a normal mode battery discharge depth acquisition module, a rescue mode battery discharge depth acquisition module and a winter mode battery discharge depth acquisition module;

[0124] The normal mode battery discharge depth acquisition module is used for, if the parsed battery life mode is the normal mode and the battery life level is the high battery life level, further obtaining the first battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the parsed battery life mode is the normal mode and the battery life level is the medium battery life level, further obtaining the second battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the parsed battery life mode is the normal mode and the battery life level is the low battery life level, further obtaining the third battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein, the first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence;

[0125] The rescue mode battery discharge depth acquisition module is used to, if the resolved battery life mode is the rescue mode and the battery life level is the high battery life level, further obtain the fourth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved battery life mode is the rescue mode and the battery life level is the medium battery life level, further obtain the fifth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved battery life mode is the rescue mode and the battery life level is the low battery life level, further obtain the sixth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein, the fourth battery remaining power range, the fifth ... fourth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fourth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery remaining power range, the fifth battery The remaining power range and the sixth battery remaining power range are both limit areas composed of the remaining power of the batteries, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; the lower limit values ​​of the fourth battery remaining power range, the fifth battery remaining power range, and the sixth battery remaining power range are all smaller than the lower limit values ​​of the first battery remaining power range, the second battery remaining power range, and the third battery remaining power range; the upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range; the upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range; the upper limit value of the sixth battery remaining power range is the same as the upper limit value of the third battery remaining power range;

[0126] The winter mode battery discharge depth acquisition module is used to, if the resolved endurance mode is the winter mode and the endurance level is the high endurance level, further obtain the seventh battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved endurance mode is the winter mode and the endurance level is the medium endurance level, further obtain the eighth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; if the resolved endurance mode is the winter mode and the endurance level is the low endurance level, further obtain the ninth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are The ranges are all limit areas composed of the remaining battery power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence; the lower limit values ​​of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all the same; the upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range; the upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and is less than the upper limit value of the first battery remaining power range; the upper limit value of the ninth battery remaining power range is greater than the upper limit value of the third battery remaining power range, and is less than the upper limit value of the second battery remaining power range.

[0127] Corresponding to a battery management system provided in Embodiment 2 of the present invention. Embodiment 3 of the present invention further provides a control device for improving the endurance of an electric vehicle, including a battery management system in Embodiment 2 of the present invention. Since a battery management system in Embodiment 3 of the present invention and a battery management system in Embodiment 2 of the present invention have the same structure and connection relationship, please refer to the relevant contents of a battery management system in Embodiment 2 of the present invention for details, and will not be repeated here one by one.

[0128] It should be noted that a control device for improving the cruising range of an electric vehicle in the third embodiment of the invention also includes a TBOX, a vehicle controller VCU and an instrument cluster ICM. For details, please refer to the relevant contents of TBOX, vehicle controller VCU and instrument cluster ICM in a control method for improving the cruising range of an electric vehicle in the first embodiment of the invention, which will not be repeated here.

[0129] Implementing the embodiments of the present invention has the following beneficial effects:

[0130] 1. The present invention is based on the battery management system. When receiving a diagnostic instruction that represents the endurance requirement, the battery management system combines the battery configuration relationship correspondence table to parse the endurance mode and its corresponding endurance level, and obtains the battery discharge depth to be modified to configure the power battery. At the same time, the battery configuration signal is generated based on the battery discharge depth to map the endurance mileage. Therefore, the battery discharge depth can be changed through the diagnostic instruction to improve the vehicle endurance, and the endurance mileage is mapped according to the battery configuration signal, so as to meet not only the conventional endurance requirements (such as the conventional mode), but also the environmental endurance (such as the winter mode) and emergency rescue requirements (such as the rescue mode);

[0131] 2. The present invention achieves three types of endurance mileages, low, medium and high, by limiting the battery discharge depth in different endurance modes, so that users can choose from a variety of endurance versions;

[0132] 3. The battery life requirement of the present invention can be initiated locally or remotely by the user, making the operation more convenient. At the same time, the usage time (such as single time, monthly, quarterly, annual and permanent) can be selected more flexibly according to the needs.

[0133] It is worth noting that in the above system embodiment, the various system units included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the various functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0134] A person skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, CD-ROM, etc.

[0135] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A control method for improving the endurance of an electric vehicle, characterized in that: The method comprises the following steps: S1. When receiving a diagnostic instruction indicating a battery life requirement, the battery management system analyzes the battery life mode and its corresponding battery life level in combination with a preset battery configuration relationship correspondence table, and further obtains the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode, and a winter mode; and the battery life level is one of a high battery life level, a medium battery life level, and a low battery life level; S2. According to the battery discharge depth to be modified, the power battery is configured to improve the driving range of the electric vehicle; Wherein, the step S1 specifically includes: If the analyzed endurance mode is the normal mode and the endurance level is the high endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the remaining power range of the first battery is the battery discharge depth to be modified; If the analyzed endurance mode is the normal mode and the endurance level is the medium endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the second battery remaining power range is the battery discharge depth to be modified; If the analyzed endurance mode is the normal mode and the endurance level is the low endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the third battery remaining power range is the battery discharge depth to be modified; The first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit value areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; Wherein, the step S1 further comprises: If the analyzed endurance mode is the winter mode and the endurance level is the high endurance level, then further in the preset battery configuration relationship correspondence table, the remaining power range of the seventh battery is obtained as the battery discharge depth to be modified; If the analyzed endurance mode is the winter mode and the endurance level is the medium endurance level, then further in the preset battery configuration relationship correspondence table, the remaining power range of the eighth battery is obtained as the battery discharge depth to be modified; If the analyzed endurance mode is the winter mode and the endurance level is the low endurance level, then further in the preset battery configuration relationship correspondence table, a ninth battery remaining power range is obtained as the battery discharge depth to be modified; The seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all limit value areas composed of the battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; The lower limits of the first battery remaining power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range, and the ninth battery remaining power range are all the same; The upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range; The upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and less than the upper limit value of the first battery remaining power range; An upper limit value of the ninth battery remaining power range is greater than an upper limit value of the third battery remaining power range, and less than an upper limit value of the second battery remaining power range.

2. The control method for improving the endurance of an electric vehicle as claimed in claim 1, characterized in that: The step S1 further comprises: If the resolved endurance mode is the rescue mode and the endurance level is the high endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the fourth battery remaining power range is the battery discharge depth to be modified; If the resolved endurance mode is the rescue mode and the endurance level is the medium endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the fifth battery remaining power range is the battery discharge depth to be modified; If the resolved endurance mode is the rescue mode and the endurance level is the low endurance level, then further obtaining in the preset battery configuration relationship correspondence table that the sixth battery remaining power range is the battery discharge depth to be modified; Among them, the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all limit areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three decrease in sequence.

3. The control method for improving the endurance of an electric vehicle as claimed in claim 2, characterized in that: The lower limits of the fourth battery remaining power range, the fifth battery remaining power range, and the sixth battery remaining power range are all smaller than the lower limits of the first battery remaining power range, the second battery remaining power range, and the third battery remaining power range; The upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range; The upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range; An upper limit value of the sixth battery remaining power range is the same as an upper limit value of the third battery remaining power range.

4. The control method for improving the endurance of an electric vehicle as claimed in claim 1, characterized in that: The diagnostic instruction is mapped from the endurance requirement initiated locally or remotely by the user after being tested under predetermined conditions and safety verified.

5. The control method for improving the driving range of an electric vehicle as claimed in claim 4, characterized in that: The battery life requirement includes battery life package information, a VIN code for finding the corresponding vehicle, and validity information for characterizing the battery life time purchased by the user; wherein, the battery life package information includes various battery life modes and their corresponding battery life levels; the purchased battery life time includes single time, monthly package, quarterly package, annual package, and permanent.

6. The control method for improving the driving range of an electric vehicle as claimed in claim 4, characterized in that: The predetermined conditions include vehicle detection conditions and vehicle status detection conditions; wherein, The vehicle detection condition is that the VIN code of at least one vehicle is the same as the VIN code carried by the endurance requirement; The vehicle state detection condition is that the vehicle simultaneously has all the states of a vehicle speed of 0, a gear position of P, and a battery voltage less than a predetermined voltage threshold.

7. The control method for improving the driving range of an electric vehicle as claimed in claim 1, characterized in that: The method further comprises: The vehicle controller periodically receives the battery configuration signal sent by the battery management system within a predetermined time range, and when it is determined that the battery configuration signal can be received in each cycle and the values ​​carried by the received battery configuration signal are all normal values, the total cruising range of the electric vehicle is obtained in a preset cruising range relationship correspondence table; wherein, the battery configuration signal is obtained by the battery management system by looking up the table in the preset battery configuration relationship correspondence table based on the battery discharge depth to be modified.

8. The control method for improving the driving range of an electric vehicle as claimed in claim 7, characterized in that: The method further comprises: If the vehicle controller determines that the value carried by the battery configuration signal received in a certain period is an abnormal value or determines that the battery configuration signal received in a certain period is lost, the battery configuration signal carrying a normal value received in the previous period is extracted for replacement.

9. The control method for improving the driving range of an electric vehicle as claimed in claim 7, characterized in that: The method further comprises: If the vehicle controller has not received the battery configuration signal sent by the battery management system within the predetermined time range and has not pre-stored the total cruising range of the electric vehicle, it will be determined that a fault has occurred and the fault information will be recorded.

10. The control method for improving the driving range of an electric vehicle according to claim 7 or 8, characterized in that: The method further comprises: The instrument cluster receives the actual remaining battery power calculated by the battery management system after completing the battery configuration, and receives the total cruising range of the electric vehicle obtained by the vehicle controller, and further combines and displays the received actual remaining battery power and the total cruising range of the electric vehicle.

11. A battery management system, characterized in that: include: A multi-mode battery discharge depth acquisition unit is used to, when receiving a diagnostic instruction representing a battery life requirement, analyze the battery life mode and its corresponding battery life level in combination with a preset battery configuration relationship correspondence table, and further obtain the battery discharge depth to be modified; wherein the battery life mode is one of a normal mode, a rescue mode and a winter mode; and the battery life level is one of a high battery life level, a medium battery life level and a low battery life level; A cruising range improvement configuration unit, used to configure the power battery according to the battery discharge depth to be modified, so as to improve the cruising range of the electric vehicle. The multi-mode battery discharge depth acquisition unit includes a normal mode battery discharge depth acquisition module, a rescue mode battery discharge depth acquisition module and a winter mode battery discharge depth acquisition module; The normal mode battery discharge depth acquisition module is used to further obtain the first battery remaining power range, the second battery remaining power range or the third battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table if the parsed battery life mode is the normal mode and the battery life levels are respectively the high battery life level, the medium battery life level or the low battery life level; wherein the first battery remaining power range, the second battery remaining power range and the third battery remaining power range are all limit value areas composed of the battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; The rescue mode battery discharge depth acquisition module is used for, if the parsed endurance mode is the rescue mode and the endurance levels are respectively the high endurance level, the medium endurance level or the low endurance level, then further obtaining the fourth battery remaining power range, the fifth battery remaining power range or the sixth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table; wherein the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all limit value areas composed of battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; the lower limit values ​​of the fourth battery remaining power range, the fifth battery remaining power range and the sixth battery remaining power range are all smaller than the lower limit values ​​of the first battery remaining power range, the second battery remaining power range and the third battery remaining power range; the upper limit value of the fourth battery remaining power range is the same as the upper limit value of the first battery remaining power range; the upper limit value of the fifth battery remaining power range is the same as the upper limit value of the second battery remaining power range; the upper limit value of the sixth battery remaining power range is the same as the upper limit value of the third battery remaining power range; The winter mode battery discharge depth acquisition module is used to further obtain the seventh battery remaining power range, the eighth battery remaining power range or the ninth battery remaining power range as the battery discharge depth to be modified in the preset battery configuration relationship correspondence table if the resolved endurance mode is the winter mode and the endurance levels are respectively the high endurance level, the medium endurance level or the low endurance level; wherein the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all limit value areas composed of the battery remaining power, and the lower limit values ​​defined by the three are the same, and the upper limit values ​​defined by the three are reduced in sequence; the first battery remaining power range The lower limits of the power range, the second battery remaining power range, the third battery remaining power range, the seventh battery remaining power range, the eighth battery remaining power range and the ninth battery remaining power range are all the same; the upper limit value of the seventh battery remaining power range is greater than the upper limit value of the first battery remaining power range; the upper limit value of the eighth battery remaining power range is greater than the upper limit value of the second battery remaining power range, and is less than the upper limit value of the first battery remaining power range; the upper limit value of the ninth battery remaining power range is greater than the upper limit value of the third battery remaining power range, and is less than the upper limit value of the second battery remaining power range.

12. A control device for improving the endurance of an electric vehicle, characterized in that: Comprising the battery management system as claimed in claim 11.

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