Method and device for controlling power display, battery management system and electric vehicle

Abstract

The application provides a kind of electric quantity display control method, device, battery management system and electric automobile, it is related to battery technical field, the method comprises: obtaining turning point electric quantity, turning point real electric quantity is higher than turning point display electric quantity;According to the size relationship between residual real electric quantity and turning point real electric quantity, in combination with the corresponding relationship of turning point real electric quantity and turning point display electric quantity, control display electric quantity.The application makes the driver have more accurate judgment on the endurance condition, and timely measures are taken.Better improve the experience of driver, also improve the safety of electric driving tool, technical scheme has good expansibility, with higher practicality.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a control method, device, battery management system, and electric vehicle for displaying battery level. Background Technology

[0002] Currently, electric driving vehicles, such as electric cars, typically monitor the battery pack in real time using a Battery Management System (BMS). The BMS converts the remaining battery charge into a percentage-based visual representation, which is then displayed to the user via a gateway, T-Box, or similar device. The displayed charge level is usually the real-time, accurate remaining charge of the battery pack (within a specified accuracy range). Users can intuitively understand the current remaining battery charge percentage by viewing the percentage data, allowing them to consider whether to continue driving or recharge.

[0003] The current battery level display control method still has some shortcomings. For example, when the road conditions or environment are complex (such as temperature, driving slope, etc.), the displayed remaining battery level may not be sufficient to meet the driver's driving purpose.

[0004] For example, when the current displayed remaining battery level is 10%, the BMS estimates a total driving range of 10km based on comprehensive road conditions. However, due to factors such as a sudden drop in temperature or many uphill sections during the journey, the actual driving range may be much less than 10km. This can lead to a misjudgment of the driving range by the driver, potentially resulting in the inability to reach a charging location in time. The electric vehicle may then become unusable due to a depleted battery, leading to a poor driving experience and, in severe cases, potentially causing safety accidents and endangering lives. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method, apparatus, battery management system and electric vehicle for controlling power display to overcome or at least partially solve the above problems.

[0006] Firstly, a method for controlling a power display is provided, the method comprising:

[0007] The power level at the turning point is obtained, which includes the actual power level at the turning point and the displayed power level at the turning point, wherein the actual power level at the turning point is higher than the displayed power level at the turning point.

[0008] Based on the relationship between the remaining actual battery level and the actual battery level at the turning point, and combined with the correspondence between the actual battery level at the turning point and the displayed battery level at the turning point, the displayed battery level is controlled.

[0009] Optionally, before acquiring the inflection point electricity, the control method further includes:

[0010] Extract a preset proportion of the actual battery power as backup power;

[0011] Based on the reserve power, determine the correspondence between the actual power level at the turning point and the displayed power level at the turning point.

[0012] Optionally, determining the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point based on the reserve battery level includes:

[0013] Based on the reserve power and the preset descent slope, the correspondence between the actual power at the turning point and the displayed power at the turning point is determined.

[0014] The correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point is as follows: the value of the actual battery level at the inflection point is equal to the sum of the displayed battery level at the inflection point and the reserve battery level.

[0015] The preset descent slope is: the slope that satisfies the requirement for smoothness in the descent of the displayed battery level from the fully charged displayed battery level to the displayed battery level at the inflection point.

[0016] Optionally, based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, and in conjunction with the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point, the displayed battery level is controlled, including:

[0017] When the remaining actual battery level is higher than the actual battery level at the inflection point, the rate at which the displayed battery level decreases is greater than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to the actual battery level at the inflection point. At this point, the displayed battery level is the battery level displayed at the inflection point.

[0018] When the remaining actual battery level is lower than the actual battery level at the turning point, the rate at which the displayed battery level decreases is controlled to be less than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to 0, at which point the displayed battery level will show as 0.

[0019] Optionally, the value of the backup power supply is required to be:

[0020] When the remaining actual battery level drops to the actual battery level at the turning point, the actual driving range achievable based on the remaining actual battery level is higher than the requirement for the comprehensive driving range, where the comprehensive driving range is the driving range estimated based on the battery level displayed at the turning point.

[0021] Optionally, a preset proportion of the actual battery power can be extracted as backup power, including:

[0022] The actual charge level of the battery pack at full capacity is taken as 100%, and a preset percentage of the actual charge level is extracted as the reserve charge level.

[0023] Secondly, a power display control device is also provided, the control device comprising:

[0024] A power acquisition module is used to acquire the power at the turning point, wherein the power at the turning point includes: the actual power at the turning point and the displayed power at the turning point, and the actual power at the turning point is higher than the displayed power at the turning point.

[0025] The control module is used to control the displayed battery level based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, combined with the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point.

[0026] Optionally, the control device further includes:

[0027] The extraction module is used to extract a preset proportion of the actual battery power as backup power.

[0028] The determination module is used to determine the correspondence between the actual power level at the turning point and the displayed power level at the turning point based on the reserve power level.

[0029] Optionally, the determining module is specifically used for:

[0030] Based on the reserve power and the preset descent slope, the correspondence between the actual power at the turning point and the displayed power at the turning point is determined.

[0031] The correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point is as follows: the value of the actual battery level at the inflection point is equal to the sum of the displayed battery level at the inflection point and the reserve battery level.

[0032] The preset descent slope is: the slope that satisfies the requirement for smoothness in the descent of the displayed battery level from the fully charged displayed battery level to the displayed battery level at the inflection point.

[0033] Optionally, the control module includes:

[0034] The first control submodule is used to control the rate at which the displayed battery level decreases to be greater than the rate at which the remaining actual battery level decreases when the remaining actual battery level is higher than the actual battery level at the inflection point, until the remaining actual battery level decreases to the actual battery level at the inflection point, at which point the displayed battery level is the battery level displayed at the inflection point.

[0035] The second control submodule is used to control the rate at which the displayed battery level decreases to be less than the rate at which the remaining actual battery level decreases when the remaining actual battery level is lower than the actual battery level at the turning point, until the remaining actual battery level decreases to 0, at which point the displayed battery level will be 0.

[0036] Optionally, the control device further includes: a backup power value acquisition module;

[0037] The backup power value acquisition module is used to acquire the value of the backup power.

[0038] The required value for the reserve power is as follows:

[0039] When the remaining actual battery level drops to the actual battery level at the turning point, the actual driving range achievable based on the remaining actual battery level is higher than the requirement for the comprehensive driving range, where the comprehensive driving range is the driving range estimated based on the battery level displayed at the turning point.

[0040] Optionally, the extraction module is specifically used for:

[0041] The actual charge level of the battery pack at full capacity is taken as 100%, and a preset percentage of the actual charge level is extracted as the reserve charge level.

[0042] Thirdly, a battery management system is provided, the battery management system being used to perform a control method for displaying battery power as described in any of the first aspects.

[0043] Thirdly, an electric vehicle is provided, the electric vehicle comprising: a battery management system for performing a control method for displaying battery power as described in any of the first aspects.

[0044] The embodiments of this application have the following advantages:

[0045] In this invention, the power level at the inflection point is first obtained, and the power level at the inflection point includes: the actual power level at the inflection point and the displayed power level at the inflection point, wherein the actual power level at the inflection point is higher than the displayed power level at the inflection point; based on the power level at the inflection point, the displayed power level is controlled according to the relationship between the remaining actual power level and the actual power level at the inflection point, combined with the correspondence between the actual power level at the inflection point and the displayed power level at the inflection point.

[0046] Because the actual battery level at the inflection point is higher than the displayed battery level, when the remaining actual battery level reaches the inflection point's actual battery level, the remaining actual battery level is actually higher than the displayed battery level. This ensures that even when the electric vehicle is operating under harsh conditions (e.g., low temperatures, many uphill sections), its actual driving range is still greater than the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions. This allows the driver to make a more accurate judgment about the remaining range, take timely countermeasures, improve the driver's experience, and enhance the safety of the electric vehicle. The battery level display control method of this invention has high practicality. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 This is a flowchart of a power display control method according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram comparing the actual battery level with the displayed battery level in an embodiment of the present invention;

[0050] Figure 3 This is a block diagram of a power display control device according to an embodiment of the present invention. Detailed Implementation

[0051] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention, and are only some, not all, embodiments of the present invention, and are not intended to limit the present invention.

[0052] The inventors discovered that the data collection and display of the battery pack's actual charge level are both based on a Battery Management System (BMS). The BMS monitors the battery pack in real time and converts the remaining charge level into a percentage-based visual representation, which is then forwarded to the TBox via a gateway for intuitive display to the driver. Simultaneously, the BMS can estimate the overall driving range of the electric vehicle based on the remaining charge level and overall driving conditions. The driver then considers whether to continue driving or find a charging point based on the displayed charge level and overall driving range.

[0053] However, in actual use of electric vehicles, the actual driving range is often much shorter than the combined driving range when the battery is low. This is because there are many harsh driving conditions in real-world driving, which greatly shorten the actual driving range of electric vehicles. This can lead to drivers misjudging the remaining range, making it impossible for the electric vehicle to reach a charging point in time, resulting in a dead battery and a poor driving experience. In severe cases, this can cause safety accidents and endanger lives.

[0054] Based on the above problems, the inventors have creatively proposed the power display control method, device, battery management system and electric vehicle of this application. The technical solution of this application will be described in detail below.

[0055] Reference Figure 1The flowchart illustrates a power display control method according to an embodiment of the present invention. The control method includes:

[0056] Step 101: Obtain the battery level at the turning point. The battery level at the turning point includes the actual battery level at the turning point and the displayed battery level at the turning point. The actual battery level at the turning point is higher than the displayed battery level at the turning point.

[0057] In this embodiment of the invention, when the electric driving vehicle starts running, the BMS first obtains the inflection point battery level. The inflection point battery level includes the actual inflection point battery level and the displayed inflection point battery level, with the actual inflection point battery level being higher than the displayed inflection point battery level. The so-called inflection point battery level is obtained based on the reserve battery level. Before the electric driving vehicle is delivered to the user, it undergoes extensive testing and simulation to finally calculate the inflection point battery level. Specifically, it may include the following steps:

[0058] Step S1: Extract a preset proportion of the actual battery power as backup power;

[0059] Step S2: Based on the reserve power, determine the correspondence between the actual power at the turning point and the power displayed at the turning point.

[0060] In this embodiment of the invention, to solve the aforementioned problem, a preset percentage of the actual battery capacity is first extracted as reserve capacity. For example, taking the actual capacity of a fully charged battery pack as 100%, a preset percentage of the actual battery capacity is extracted as reserve capacity. Assuming the preset percentage is 5%, and the actual capacity of a fully charged battery pack is 100%, then the reserve capacity is 5% of the actual capacity of a fully charged battery pack. For simplicity and consistency, the following text will directly express the battery capacity as a percentage, without emphasizing the percentage. For example, 5% actual capacity means 5% of the actual capacity of a fully charged battery pack, and 10% displayed capacity means 10% of the displayed capacity when fully charged.

[0061] In this embodiment of the invention, the extraction of reserve power is to improve the actual driving range of the electric driving vehicle. At the same time, the reserve power and the preset descent slope need to be combined, and after comprehensive consideration and calculation, the power at the turning point can be obtained to solve the aforementioned problems.

[0062] Specifically, after extracting the reserve power, the corresponding relationship between the actual power at the turning point and the power displayed at the turning point is determined by combining the reserve power and the preset descent slope. It is necessary to ensure that the value of the actual power at the turning point is the sum of the power displayed at the turning point and the reserve power; that is, assuming the power displayed at the turning point is 10% and the reserve power is 5%, then the actual power at the turning point is 15%.

[0063] The preset descent slope refers to the slope required to ensure a smooth decrease in the displayed battery level from full charge to the inflection point. A steep descent, equivalent to a higher inflection point (e.g., if the actual battery level at the inflection point is 20%, then the displayed battery level is 15%), results in a rapid decrease from full charge to the inflection point, leading to a poor driving experience. Conversely, a gentler descent, equivalent to a lower inflection point (e.g., if the actual battery level at the inflection point is 8%, then the displayed battery level is 3%), results in a slower decrease from full charge to the inflection point. However, in actual use, drivers typically don't wait until the displayed battery level is so low to assess range or charging; they usually start considering charging at a lower level, such as 10%.

[0064] The preset descent slope is obtained after comprehensively considering various factors, based on big data analysis and the size of the reserve power. Therefore, the determination of the inflection point power satisfies the preset descent slope.

[0065] The requirements for the value of the reserve power are as follows:

[0066] When the remaining actual battery level drops to the inflection point actual battery level, the actual driving range achievable based on the remaining actual battery level must be greater than the comprehensive driving range estimated based on the displayed battery level at the inflection point. In this case, the value of the reserve battery level, whether for the actual driving range or the comprehensive driving range, needs to be determined in conjunction with the actual usage conditions.

[0067] For example, taking electric driving tools as an example, the requirement for the reserve power is: when the remaining real power decreases to the real power at the turning point, the actual driving range achieved by the electric driving tool based on the remaining real power and adverse driving conditions is greater than the requirement for the comprehensive driving range. The comprehensive driving range is the driving range estimated by the BMS based on the power displayed at the turning point and the comprehensive driving conditions.

[0068] Therefore, the extraction of reserve power and the determination of the inflection point power are quantities that require extensive testing and simulation. For example, if the reserve power is 5%, the actual power at the inflection point is 15%, and the displayed power at the inflection point is 10%, then the requirements for the preset descent slope and the reserve power value are met. If the reserve power is 5%, the actual power at the inflection point is 9%, and the displayed power at the inflection point is 4%, although the reserve power value requirement is met, the requirement for the preset descent slope is not met. In this case, the determination of the inflection point power is inappropriate and needs to be recalculated.

[0069] Alternatively, if the reserve power is 3%, the actual power at the turning point is 13%, and the displayed power at the turning point is 10%, while this satisfies the preset descent slope requirement, it does not meet the requirement for the reserve power value. That is, when the remaining actual power drops to 13% of the actual power at the turning point, the actual driving range achieved by the electric vehicle based on the remaining actual power and adverse driving conditions is less than the driving range estimated by the BMS based on the displayed power at the turning point of 10% and comprehensive driving conditions. Therefore, extracting the reserve power is inappropriate. However, if the reserve power is 3%, the actual power at the turning point is 13%, and the displayed power at the turning point is 10%, this also satisfies the aforementioned preset descent slope requirement and the reserve power value requirement. Therefore, determining this set of reserve power and turning point power values ​​can also solve the aforementioned problem.

[0070] Step 102: Based on the relationship between the remaining actual battery level and the actual battery level at the turning point, and combined with the correspondence between the actual battery level at the turning point and the displayed battery level at the turning point, control the displayed battery level.

[0071] In this embodiment of the invention, after the BMS obtains the battery level at the inflection point, it can control the displayed battery level based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, combined with the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point. Specifically, this includes:

[0072] Step V1: When the remaining actual battery level is higher than the actual battery level at the inflection point, control the rate at which the displayed battery level decreases to be greater than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to the actual battery level at the inflection point. At this point, the displayed battery level will be the battery level displayed at the inflection point.

[0073] In step V1, since the actual battery level at the inflection point is higher than the displayed battery level at the inflection point, and the difference between the two is one reserve battery level, and both the actual battery level and the displayed battery level start to decrease from 100%, the decrease in the remaining actual battery level from the full charge (100%) until it reaches the value of the decrease in the actual battery level at the inflection point is less than the decrease in the displayed battery level from the full charge (100%) until it reaches the value of the decrease in the displayed battery level at the inflection point.

[0074] For example, if the reserve battery is 5% and the actual battery level at the turning point is 15%, the displayed battery level at the turning point would be 10%. If the actual battery level starts decreasing from 100% and drops to 15%, the actual battery level decreases by 85%. However, if the displayed battery level starts decreasing from 100% and drops to 10%, the displayed battery level decreases by 90%. To achieve this, the BMS needs to control the rate of decrease of the displayed battery level to be greater than the rate of decrease of the actual battery level. However, since the slope of the displayed battery level at the turning point also meets the requirements for smoothness, the driver will not have a negative experience in terms of the visually displayed battery level.

[0075] Step V2: When the remaining actual battery level is lower than the actual battery level at the turning point, control the rate at which the displayed battery level decreases to be less than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to 0, at which point the displayed battery level will be 0.

[0076] In this embodiment of the invention, when the remaining real power continues to decrease and falls below the real power at the inflection point, the actual remaining real power is higher than the displayed power by one reserve power. Therefore, the decrease in the remaining real power from the inflection point until it reaches 0 is greater than the decrease in the displayed power from the inflection point until it reaches 0.

[0077] For example, if the reserve battery is 5% and the actual battery level at the turning point is 15%, the displayed battery level at the turning point would be 10%. The remaining actual battery level decreases from 15% to 0%, a reduction of 15% in actual battery level. However, the displayed battery level decreases from 10% to 0%, a reduction of 10% in displayed battery level. To achieve this, the BMS needs to control the rate of decrease in displayed battery level to be less than the rate of decrease in the actual remaining battery level. Because the actual remaining battery level is higher than the displayed battery level, even when the electric vehicle is operating under relatively harsh conditions, its actual driving range can still be greater than or equal to the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions.

[0078] The above process, combined with Figure 2 The diagram showing the comparison between the actual battery level and the displayed battery level provides a more intuitive and clear understanding. Figure 2 In the diagram, the horizontal axis represents time, and the vertical axis represents the battery percentage. Line 1 represents the actual battery percentage, and line 2 represents the displayed battery percentage. The reserve battery is 5%. The turning points are: actual battery at the turning point is 15%, and displayed battery at the turning point is 10%. Therefore, as the remaining actual battery decreases from 100% to 15%, the corresponding displayed battery decreases from 100% to 10%. The rate of decrease of the displayed battery is slightly higher than the rate of decrease of the actual battery, which will not bring a bad driving experience to the driver.

[0079] Once the remaining actual battery level reaches the critical threshold, the rate at which the actual battery level decreases from 15% to 0% is slower than the rate at which the displayed battery level decreases from 10% to 0%. Because the remaining actual battery level is higher, the electric vehicle can maintain an actual driving range greater than or equal to the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions, even under more challenging conditions. Of course, it's understandable that if the electric vehicle is driven under ideal or even better conditions, its actual driving range will be longer than under more challenging conditions, and naturally longer than the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions, resulting in a superior driving experience.

[0080] Based on the above-described power display control method, this embodiment of the invention also provides a power display control device, referring to... Figure 3 The diagram shows a block diagram of a power display control device according to an embodiment of the present invention. The power display control device includes:

[0081] The power acquisition module 310 is used to acquire the power at the turning point, the power at the turning point includes: the actual power at the turning point and the displayed power at the turning point, wherein the actual power at the turning point is higher than the displayed power at the turning point.

[0082] The control module 320 is used to control the displayed battery level based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, and in conjunction with the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point.

[0083] Optionally, the control device further includes:

[0084] The extraction module is used to extract a preset proportion of the actual battery power as backup power.

[0085] The determination module is used to determine the correspondence between the actual power level at the turning point and the displayed power level at the turning point based on the reserve power level.

[0086] Optionally, the determining module is specifically used for:

[0087] Based on the reserve power and the preset descent slope, the correspondence between the actual power at the turning point and the displayed power at the turning point is determined.

[0088] The correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point is as follows: the value of the actual battery level at the inflection point is equal to the sum of the displayed battery level at the inflection point and the reserve battery level.

[0089] The preset descent slope is: the slope that satisfies the requirement for smoothness in the descent of the displayed battery level from the fully charged displayed battery level to the displayed battery level at the inflection point.

[0090] Optionally, the control module 320 includes:

[0091] The first control submodule is used to control the rate at which the displayed battery level decreases to be greater than the rate at which the remaining actual battery level decreases when the remaining actual battery level is higher than the actual battery level at the inflection point, until the remaining actual battery level decreases to the actual battery level at the inflection point, at which point the displayed battery level is the battery level displayed at the inflection point.

[0092] The second control submodule is used to control the rate at which the displayed battery level decreases to be less than the rate at which the remaining actual battery level decreases when the remaining actual battery level is lower than the actual battery level at the turning point, until the remaining actual battery level decreases to 0, at which point the displayed battery level will be 0.

[0093] Optionally, the control device further includes: a backup power value acquisition module;

[0094] The backup power value acquisition module is used to acquire the value of the backup power.

[0095] The required value for the reserve power is as follows:

[0096] When the remaining actual battery level drops to the actual battery level at the turning point, the actual driving range achievable based on the remaining actual battery level is higher than the requirement for the comprehensive driving range, where the comprehensive driving range is the driving range estimated based on the battery level displayed at the turning point.

[0097] Optionally, the extraction module is specifically used for:

[0098] The actual charge level of the battery pack at full capacity is taken as 100%, and a preset percentage of the actual charge level is extracted as the reserve charge level.

[0099] Based on the above-described power display control method, this embodiment of the invention also provides a battery management system, which is used to execute the power display control method as described in any of steps 101 to 102 above.

[0100] Based on the above-described power display control method, this embodiment of the invention also provides an electric vehicle, the electric vehicle including: a battery management system;

[0101] The battery management system is used to execute the power display control method as described in any of steps 101 to 102 above.

[0102] Through the above embodiments, the power display control method of the present invention first extracts the reserve power, and then combines the reserve power and a preset descent slope to determine the actual power level at the inflection point and the power level displayed at the inflection point, so that the actual power level at the inflection point is higher than the power level displayed at the inflection point. During the actual operation of the electric driving vehicle, the BMS uses the power level at the inflection point as a benchmark. When the remaining actual power level is higher than the actual power level at the inflection point, the BMS controls the rate at which the displayed power level decreases to be greater than the rate at which the remaining actual power level decreases, until the remaining actual power level decreases to the actual power level at the inflection point. At this point, the displayed power level is the power level displayed at the inflection point.

[0103] When the remaining actual battery level is lower than the actual battery level at the turning point, the BMS controls the rate at which the displayed battery level decreases to be less than the rate at which the remaining actual battery level decreases, until the remaining actual battery level drops to 0, at which point the displayed battery level will be 0.

[0104] Because the actual battery level at the inflection point is higher than the displayed battery level, when the remaining actual battery level reaches the inflection point's actual battery level, the actual remaining battery level is actually higher than the displayed battery level. This means that even when the electric vehicle is operating under relatively harsh conditions (such as low temperatures or numerous uphill sections), its actual driving range can still be greater than the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions. This allows the driver to make a more accurate judgment about the remaining range and take timely countermeasures. If the electric vehicle is operating under comprehensive conditions, or even better conditions, its actual driving range will be longer than under harsh conditions, naturally exceeding the combined driving range estimated by the BMS based on the displayed battery level and overall road conditions. This provides a superior driving experience and enhances the safety of the electric vehicle.

[0105] The above description uses an electric driving tool as an example to illustrate the power display control method of this invention. In practical use, this control method can also be extended to any device that uses electricity as its energy source and has a power display, such as a smartphone. The difference is that the reserve power requirement can be set to ensure that when the remaining actual power level drops to the threshold level, the actual usage time achievable under high power consumption conditions (such as simultaneously running multiple apps on a smartphone, watching HD movies, or playing large mobile games) is higher than the overall usage time requirement. The overall usage time is the estimated usage time based on the threshold power level and overall power consumption conditions (such as browsing the web or reading novels on a smartphone). In summary, the power display control method of this invention has high practicality.

[0106] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0107] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0108] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A control method for displaying battery level, characterized in that, The control method includes: The power level at the turning point is obtained, which includes the actual power level at the turning point and the displayed power level at the turning point, wherein the actual power level at the turning point is higher than the displayed power level at the turning point. Based on the relationship between the remaining actual battery level and the actual battery level at the turning point, and combined with the correspondence between the actual battery level at the turning point and the displayed battery level at the turning point, the displayed battery level is controlled. Before obtaining the inflection point electricity, the control method further includes: Extract a preset proportion of the actual battery power as backup power; Based on the reserve power and the preset descent slope, the correspondence between the actual power at the turning point and the displayed power at the turning point is determined. The correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point is as follows: the value of the actual battery level at the inflection point is equal to the sum of the displayed battery level at the inflection point and the reserve battery level. The preset descent slope is: the slope that satisfies the requirement for smoothness in the descent of the displayed battery level from the fully charged displayed battery level to the displayed battery level at the inflection point.

2. The control method according to claim 1, characterized in that, Based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, and combining the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point, the displayed battery level is controlled, including: When the remaining actual battery level is higher than the actual battery level at the inflection point, the rate at which the displayed battery level decreases is greater than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to the actual battery level at the inflection point. At this point, the displayed battery level is the battery level displayed at the inflection point. When the remaining actual battery level is lower than the actual battery level at the turning point, the rate at which the displayed battery level decreases is controlled to be less than the rate at which the remaining actual battery level decreases, until the remaining actual battery level decreases to 0, at which point the displayed battery level will show as 0.

3. The control method according to claim 1, characterized in that, The required value for the reserve power is as follows: When the remaining actual battery level drops to the actual battery level at the turning point, the actual driving range achievable based on the remaining actual battery level is greater than the requirement for a comprehensive driving range, where the comprehensive driving range is the driving range estimated based on the battery level displayed at the turning point.

4. The control method according to claim 1, characterized in that, Extracting a preset proportion of actual battery power as backup power includes: The actual charge level of the battery pack at full capacity is taken as 100%, and a preset percentage of the actual charge level is extracted as the reserve charge level.

5. A control device for displaying battery level, characterized in that, The control device includes: A power acquisition module is used to acquire the power at the turning point, wherein the power at the turning point includes: the actual power at the turning point and the displayed power at the turning point, and the actual power at the turning point is higher than the displayed power at the turning point. The control module is used to control the displayed battery level based on the relationship between the remaining actual battery level and the actual battery level at the inflection point, combined with the correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point. The control device further includes: The extraction module is used to extract a preset proportion of the actual battery power as backup power. The determination module is used to determine the correspondence between the actual power level at the turning point and the displayed power level at the turning point based on the reserve power level and a preset descent slope. The correspondence between the actual battery level at the inflection point and the displayed battery level at the inflection point is as follows: the value of the actual battery level at the inflection point is equal to the sum of the displayed battery level at the inflection point and the reserve battery level. The preset descent slope is: the slope that satisfies the requirement for smoothness in the descent of the displayed battery level from the fully charged displayed battery level to the displayed battery level at the inflection point.

6. A battery management system, characterized in that, The battery management system is used to execute the power display control method as described in any one of claims 1-4.

7. An electric vehicle, characterized in that, The electric vehicle includes a battery management system, which is used to execute the control method for displaying battery power as described in any one of claims 1-4.

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