Battery charge management method and device for hybrid vehicle, medium and terminal

Abstract

The application provides a battery power management method and device of a hybrid vehicle, a medium and a terminal. The hybrid vehicle is provided with a power generation unit and a battery, can be charged by an external power supply, and has a charging system for dividing multiple charging upper limits according to control. The battery power management device of the hybrid vehicle comprises: a first acquisition unit, a first acquisition unit, for acquiring vehicle running data, the vehicle running data comprising: vehicle cumulative use time and / or cumulative running distance since the completion of the previous refresh charging time of the battery; a judgment unit for judging whether the vehicle running data reaches a first set threshold; and an execution unit for executing a refresh charging reminding operation to remind to correct the SOC value when it is judged that the vehicle running data reaches the first set threshold. The above scheme enables the user to intuitively know the timing of the refresh charging, and helps to timely correct the SOC of the battery.

Description

Technical Field

[0001] This invention relates to the field of storage batteries, specifically to a method, device, medium, and terminal for managing the battery power of a hybrid vehicle. Background Technology

[0002] Hybrid vehicles such as fuel cell vehicles (FCVs), plug-in hybrid electric vehicles (PHEVs), and range-extended electric vehicles are typically equipped with both a power generation unit and a driving battery. The power generation unit charges the driving battery, and the state of charge (SOC) of the battery can be controlled within a certain range so that the battery can operate in its optimal state.

[0003] The State of Charge (SOC) of a battery refers to the proportion of its total dischargeable capacity to the capacity it can release. It is typically determined using an OCV-SOC lookup table, which uses the Open Circuit Voltage (OCV) and the mapping relationship between OCV and SOC in the OCV-SOC table to obtain the SOC value. However, for some types of batteries (such as lithium iron phosphate batteries), within the optimal SOC range, the voltage remains almost constant. In this case, while the SOC value may change, the voltage variation is small and remains within a roughly horizontal range. Figure 1 The diagram shown illustrates the mapping relationship between the OCV and SOC of a battery. Figure 1 In this diagram, W represents the SOC range corresponding to the battery's optimal state, and A refers to the SOC range where the voltage is almost constant, meaning the voltage is also within a roughly horizontal range. Therefore, it's difficult to determine the SOC value solely based on voltage. The current integration method is typically used to estimate the SOC value. However, the SOC value estimated using the current integration method is prone to sudden changes during battery use, which can affect the battery's normal operation.

[0004] In practice, vehicle users often find it difficult to determine when to charge their vehicle's battery, which can affect the battery's normal operation. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is that it is difficult for users to determine when the power battery of a hybrid vehicle should be charged.

[0006] To address the aforementioned technical problems, this invention provides a battery power management device for a hybrid vehicle. The hybrid vehicle is equipped with a generator unit and a battery, can be charged by an external power source, and has a charging system that divides charging into multiple stages based on control limits. The battery power management device includes: a first acquisition unit for acquiring vehicle driving data, including the vehicle's cumulative usage time and / or cumulative mileage calculated from the last time the battery completed its charging refresh; a judgment unit for determining whether the vehicle driving data has reached a first preset threshold; and an execution unit for executing a refresh charging reminder operation when the vehicle driving data is determined to have reached the first preset threshold, to remind the user to perform SOC value correction.

[0007] Optionally, the execution unit is configured to perform at least one of the following operations to refresh the charging reminder: control the indicator light on the instrument panel to flash; display reminder information on the display interface of the instrument panel or in-vehicle device; and output voice reminder information.

[0008] Optionally, the battery power management device for the hybrid vehicle further includes: a first refresh charging unit; the judgment unit is further configured to determine whether the vehicle driving data has reached a second preset threshold; the first refresh charging unit is configured to perform refresh charging when it is determined that the vehicle driving data has reached the second preset threshold and when it is detected that the battery is being charged by an external power source, so as to correct the SOC value of the battery, wherein the second preset threshold is less than the first preset threshold.

[0009] Optionally, the first refresh charging unit is used to increase the full-charge SOC value during charging from a first SOC value to a second SOC value, and detect the charging voltage of the battery during charging. When the charging voltage reaches a preset first voltage, the SOC value of the battery is corrected to the second SOC value; or, it decreases the full-discharge SOC value during discharging from a third SOC value to a fourth SOC value, detects the discharge voltage of the battery, and when the discharge voltage reaches a preset second voltage, corrects the SOC value of the battery to the fourth SOC value, and charges the battery until the SOC value of the battery reaches the full-charge SOC.

[0010] Optionally, the battery power management device of the hybrid vehicle further includes a reset unit, used to reset the vehicle driving status data to initial data when the refresh charging is detected to be completed. The initial data includes: the cumulative usage time of the vehicle as the initial duration and / or the cumulative mileage as the initial mileage.

[0011] Optionally, the battery power management device of the hybrid vehicle further includes a second refresh charging unit, which performs refresh charging if it is determined that the vehicle driving data has reached a first preset threshold and it is detected that the battery is being charged by an external power source.

[0012] Optionally, the execution unit is further configured to perform a refresh charging reminder operation again when it is determined that the vehicle driving data has reached a third preset threshold, wherein the third preset threshold is greater than the first preset threshold.

[0013] This invention provides a battery power management method for a hybrid vehicle. The hybrid vehicle is equipped with a generator unit and a battery, can be charged by an external power source, and has a charging system that divides the charging upper limit into multiple stages according to control. The method includes: acquiring vehicle driving data, which includes: the cumulative usage time and / or cumulative mileage of the vehicle calculated from the last time the battery was refreshed for charging; determining whether the vehicle driving data has reached a first preset threshold; and when the vehicle driving data is determined to have reached the first preset threshold, performing a refresh charging reminder operation to remind the user to perform SOC value correction.

[0014] This invention also provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the steps of any of the above-described battery power management methods for hybrid vehicles.

[0015] This invention also provides a terminal, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the steps of the battery power management method for any of the above-described hybrid vehicles.

[0016] Compared with the prior art, the technical solution of the embodiments of the present invention has the following beneficial effects:

[0017] For hybrid vehicles equipped with a generator unit and a battery that can be charged via an external power source, a battery power management device is provided. The first acquisition unit of the battery power management device can acquire vehicle driving data, including: cumulative usage time and / or cumulative mileage calculated from the last time the battery completed its refresh charging. A judgment unit is used to determine whether the vehicle driving data has reached a first preset threshold. An execution unit is used to execute a refresh charging reminder operation when the vehicle driving data reaches the first preset threshold, to remind the user to perform SOC correction. For hybrid vehicles equipped with a generator unit and a battery, since the generator unit typically charges the battery and the power required for vehicle operation is usually provided by the battery, vehicle driving data, such as cumulative usage time and cumulative mileage, can indirectly characterize the battery's usage status. Since the battery's SOC estimation error increases with battery usage time, determining the refresh charging reminder time based on vehicle driving data can help vehicle users easily know when to refresh the battery for SOC correction, thus contributing to the normal use of the battery.

[0018] Furthermore, when the vehicle driving data reaches the second set threshold, if it is detected that the battery is being charged by an external power source, the SOC of the battery is corrected. By correcting the SOC of the battery when the vehicle is being charged by an external power source, the cumulative error generated during SOC estimation is reduced or eliminated, the accuracy of SOC value estimation is improved, and the normal use of the battery is ensured. Attached Figure Description

[0019] Figure 1 A mapping diagram between the OCV and SOC of a battery is given;

[0020] Figure 2 This is a schematic diagram of the structure of a battery power management device for a hybrid vehicle according to an embodiment of the present invention;

[0021] Figure 3 This is a timing diagram of the operation of a battery power management device for a hybrid vehicle according to an embodiment of the present invention;

[0022] Figure 4 This is a flowchart of a battery power management method for a hybrid vehicle according to an embodiment of the present invention. Detailed Implementation

[0023] As mentioned above, for batteries with a roughly horizontal voltage-SOC relationship, there may be a significant error between the estimated SOC based on voltage within this horizontal range and the actual SOC. For such batteries, there are known methods to correct the SOC value by charging the battery to a specified voltage (typically 100% of a full charge) outside the roughly horizontal range. Generally, SOC value correction (refresh charging) is performed by the user connecting the charging plug to a power source for a full charge.

[0024] On the other hand, in plug-in hybrid vehicles (PHEVs), such as fuel cell vehicles (FCVs), plug-in hybrid electric vehicles (PHEVs), and range-extended electric vehicles (REEVs), which are equipped with a generator unit in addition to the battery for driving, the driving range can be extended by using the generator unit compared to using only battery power. Therefore, compared to pure electric vehicles, the necessity of charging every time is generally lower. Thus, during regular charging, from the perspective of balancing charging time and extending battery life, since the driving range can be ensured by using the generator unit, even if the user plugs in the charger, it is usually not charged to full capacity. Instead, a certain SOC value corresponding to a roughly level voltage range is used as the upper limit of charging to improve practicality. When the battery's SOC value drops, the generator unit generates electricity to charge the battery, increasing the battery's SOC value and keeping it within the optimal SOC range for the battery. Therefore, the necessity of using a plug to charge for driving needs is very low.

[0025] Therefore, when using battery systems that require charging to a specified upper limit for SOC value refresh, and employing multi-stage charging limits through this control, compared to pure electric vehicles, users have a weaker psychological awareness of the necessity of charging, naturally resulting in fewer opportunities for prolonged plug-in charging. During vehicle use, users often find it difficult to determine when the battery's SOC value should be corrected. When the cumulative error in the battery's SOC value reaches a certain level, it can easily lead to a sudden change in SOC, causing problems such as the vehicle failing to start at extremely low temperatures or insufficient driving force during operation. Extremely low temperatures refer to temperatures below a set limit, such as below 0°C.

[0026] Therefore, for plug-in electric vehicles such as FC, PHEV, and range-extended EV, which are equipped with a power generation unit in addition to the driving battery, users must be made aware of the necessity of performing this special charging operation.

[0027] To address the aforementioned issues, in this embodiment of the present disclosure, a battery power management device is provided for a hybrid vehicle equipped with a power generation unit and a battery that can be charged via an external power source. The first acquisition unit of the battery power management device can acquire vehicle driving data, including: the cumulative usage time and / or cumulative mileage of the vehicle calculated from the last time the battery completed its charging refresh. A judgment unit is used to determine whether the vehicle driving data has reached a first preset threshold. An execution unit is used to execute a refresh charging reminder operation when the vehicle driving data reaches the first preset threshold, to remind the user to perform SOC correction. For hybrid vehicles equipped with a generator and a battery, the generator typically charges the battery, and the power required for vehicle operation is usually provided by the battery. Therefore, vehicle driving data, such as cumulative usage time and cumulative mileage, can indirectly characterize the battery's usage status. The battery's State of Charge (SOC) estimation error increases with battery usage time. Thus, determining when to refresh the charging reminder based on vehicle driving data can help vehicle users easily know when to refresh the battery's charge. Refreshing the charging reminder enhances users' awareness of the necessity of this special charging operation, thereby correcting the SOC value and contributing to the normal use of the battery.

[0028] To make the above-mentioned objectives, features and beneficial effects of the embodiments of the present invention more apparent and understandable, the specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0029] This invention provides a battery power management device for a hybrid vehicle, with reference to... Figure 2 The present invention provides a schematic diagram of the structure of a battery power management device for a hybrid vehicle according to an embodiment of the present invention.

[0030] In practical implementation, the hybrid vehicle (hereinafter referred to as the vehicle) to which the battery power management device 20 is applicable can be equipped with a power generation unit and a battery, and can be charged by an external power source. The vehicle has a charging system with multi-stage charging upper limits based on control, where the charging upper limit refers to the full charge SOC value, and the multi-stage charging upper limit refers to the fact that the vehicle can have multiple charging modes, and the full charge SOC value can be different in different charging modes.

[0031] Different types of hybrid vehicles use different power generation units, which both generate electricity and charge the battery. When the hybrid vehicle is a fuel cell vehicle (FCV), the fuel cell serves as the power generation unit. When the hybrid vehicle is a PHEV or a range-extended electric vehicle, the engine serves as the power generation unit.

[0032] In a specific implementation, the battery power management device 20 of a hybrid vehicle may include: a first acquisition unit 201, a judgment unit 202, and an execution unit 203, wherein:

[0033] The first acquisition unit 201 is used to acquire vehicle driving data, the vehicle driving status data including: the cumulative usage time and / or cumulative mileage of the vehicle calculated from the last refresh charging time of the battery before it was completed.

[0034] The judgment unit 202 is used to determine whether the vehicle driving data has reached a first preset threshold.

[0035] The execution unit 203 is used to perform a refresh charging reminder operation when it is determined that the vehicle driving data has reached the first set threshold, so as to remind the user to perform SOC value correction.

[0036] In practice, refresh charging refers to the user connecting the charging plug (also known as the charging gun) to the power source for full charging to correct the SOC value.

[0037] Using the above scheme, for hybrid vehicles equipped with a power generation unit and a battery that can be charged by an external power source, a battery power management device is provided. The first acquisition unit of the battery power management device can acquire vehicle driving data, which includes: the cumulative usage time and / or cumulative mileage of the vehicle calculated from the last refresh charging time before the battery was completed; a judgment unit is used to determine whether the vehicle driving data has reached a first preset threshold; and an execution unit is used to execute a refresh charging reminder operation when the vehicle driving data reaches the first preset threshold to remind the user to perform SOC correction. For hybrid vehicles equipped with a generator and a battery, the generator typically charges the battery, and the power required for vehicle operation is usually provided by the battery. Therefore, vehicle driving data, such as cumulative usage time and cumulative mileage, can indirectly characterize the battery's usage status. The battery's State of Charge (SOC) estimation error increases with battery usage time. Thus, determining when to refresh the charging reminder based on vehicle driving data can help vehicle users easily know when to refresh the battery's charge. Refreshing the charging reminder enhances users' awareness of the necessity of this special charging operation, thereby correcting the SOC value and contributing to the normal use of the battery.

[0038] In some embodiments, the vehicle driving data may include: the cumulative vehicle usage time calculated from the time the battery completed its previous refresh charging; or the mileage calculated from the time the battery completed its previous refresh charging; or both the cumulative vehicle usage time and the cumulative mileage calculated from the time the battery completed its previous refresh charging. The cumulative vehicle usage time may refer to the cumulative vehicle usage time from the time the last refresh charging was completed (i.e., the time the last SOC calibration was completed) to the current time. Here, the cumulative vehicle usage time refers to the cumulative usage time when the vehicle is in the running state.

[0039] Cumulative mileage refers to the vehicle's cumulative mileage from the time the last charging cycle was completed (i.e., the last SOC calibration was completed) to the current time.

[0040] In specific implementation, the first acquisition unit 201 can acquire vehicle driving data each time the vehicle is started. Subsequently, during the period the vehicle is in the started state, the start-up time is accumulated to obtain the cumulative vehicle usage time. Alternatively, the vehicle's mileage can be accumulated to obtain the cumulative mileage.

[0041] In a specific implementation, the execution unit 203 is used to perform at least one of the following operations to refresh the charging reminder: control the indicator light on the dashboard to flash; display reminder information on the display interface of the dashboard or vehicle device; and output voice reminder information.

[0042] The indicator lights on the dashboard can be newly added, communicating with the battery power management device 20 of the hybrid vehicle, and can flash or illuminate under the control of the battery power management device 20. Existing indicator lights can also be reused; when reusing existing indicator lights, to distinguish the meaning of the flashing at different times, the flashing color, flashing frequency, or other reminder information can be used for differentiation.

[0043] The reminders displayed on the dashboard or in-vehicle device can be text-based or graphic-based (such as a charging plug icon). Additionally, the in-vehicle device can display reminders for cumulative vehicle usage time, cumulative mileage, and battery SOC deviation.

[0044] In specific implementation, when the vehicle driving data includes the vehicle's cumulative usage time, the first set threshold includes a preset first duration. The judgment unit 202 is used to perform a refresh charging reminder operation if the vehicle's cumulative usage time, calculated from the time the battery completed its previous refresh charging, reaches the preset first duration; and / or, when the vehicle driving data includes the cumulative mileage and the first set threshold includes a preset first mileage, a refresh charging reminder operation is performed if the cumulative mileage reaches the preset first mileage.

[0045] Research has found that as the cumulative operating time of the battery increases, i.e., as the cumulative vehicle usage time or cumulative mileage increases, the cumulative error of the battery's State of Charge (SOC) increases, and the estimated SOC deviation increases. In hybrid vehicles, the battery provides power for the vehicle's operation, thus the vehicle's mileage is related to the increase in cumulative usage time or cumulative mileage, and is also related to the estimated SOC deviation of the battery. Therefore, the estimated SOC deviation of the battery can be determined using vehicle driving data. Based on the acceptable estimated SOC deviation, the corresponding cumulative vehicle usage time or cumulative mileage is estimated, and the estimated cumulative usage time is used as the first duration or the cumulative mileage as the first mileage. The first duration and / or the first mileage can serve as a reference for when to remind the user to recharge.

[0046] In some embodiments, the vehicle driving data includes the vehicle's cumulative usage time. The determination unit 202 can determine whether a refresh charging reminder needs to be executed based on whether the vehicle's cumulative usage time has reached a first duration. That is, by determining whether the vehicle's cumulative usage time has reached the first duration, it is determined whether the vehicle driving data has reached a first preset threshold. If the vehicle's cumulative usage time increases to reach the first duration, it is determined that the vehicle driving data has reached the first preset threshold, and at this time it is necessary to execute a refresh charging to correct the SOC value.

[0047] In other embodiments, vehicle driving data includes cumulative mileage. The determination unit 202 can determine whether a refresh charging reminder needs to be executed based on whether the cumulative mileage has reached a first mileage. That is, the vehicle driving data is determined to have reached a first preset threshold by checking whether the cumulative mileage has reached the first mileage. If the vehicle's cumulative mileage reaches the first mileage, it is determined that the vehicle driving data has reached the first preset threshold, and it is necessary to execute a refresh charging to correct the SOC value.

[0048] In some embodiments, the vehicle driving data includes the vehicle's cumulative usage time and cumulative mileage. The determination unit 202 can determine whether to execute a refresh charging reminder by checking whether the vehicle's cumulative usage time has reached a first duration and whether the cumulative mileage has reached a first mileage. This avoids the problem of failing to promptly refresh charging reminders when there are issues with the vehicle's cumulative usage time or cumulative mileage statistics. Furthermore, it improves the accuracy of determining the timing of refreshing charging reminders.

[0049] Research has revealed that the sudden change in SOC during battery use is due to errors in the current sensor used to collect current values ​​during sampling. Furthermore, errors may also occur during the analog-to-digital (A / D) conversion of the current values ​​collected by the current sensor. Consequently, the estimated SOC value calculated based on the integration of current value and time deviates from the actual SOC value. Since the estimated SOC value is derived from time integration, the error accumulates over time, and the deviation between the estimated SOC value and the actual SOC value gradually increases with the battery's usage time. Therefore, the deviation of the estimated SOC value can be determined based on battery usage data.

[0050] In some non-limiting embodiments, the first duration may be determined based on the rate of increase of the battery's cumulative SOC error and the allowable deviation of the SOC error.

[0051] In practical implementation, the allowable error deviation of SOC may include a first deviation and / or a second deviation. The first deviation is the maximum allowable deviation of the estimated SOC value from the actual SOC value; the second deviation is the maximum allowable deviation of the estimated SOC value from the actual SOC value.

[0052] That is, when the allowable error deviation of the SOC includes a first deviation, the first duration is determined based on the cumulative error rise rate of the SOC and the first deviation. When the allowable error deviation of the SOC includes a second deviation, the first duration is determined based on the cumulative error rise rate of the SOC and the second deviation. When the allowable error deviation of the SOC includes both the first and second deviations, the first duration is determined based on the cumulative error rise rate of the SOC, the first deviation, and the second deviation.

[0053] In practice, to maintain the battery in optimal operating condition, a preset lower limit of SOC (also known as full discharge SOC) is typically configured for the battery. When the estimated SOC of the battery reaches the preset lower limit, the battery discharge is restricted, and the battery usually needs to be charged to avoid battery depletion and improve battery performance.

[0054] In specific implementation, the first deviation can be determined in the following way: based on the preset lower limit of SOC and the actual lower limit of SOC, calculate the difference between the preset lower limit of SOC and the actual lower limit of SOC, and obtain the maximum deviation of the allowable SOC estimate value from the actual SOC value based on the calculated difference, which is the first deviation.

[0055] In some non-limiting embodiments, a commonly used lower limit of SOC can be set from an energy management perspective, and this commonly used lower limit of SOC can be used as a preset lower limit of SOC. Energy management can include one or more of the following: vehicle energy management, battery energy management, etc.

[0056] In some non-limiting embodiments, the actual lower limit of SOC can be calculated based on the battery output required by the vehicle's output power demand.

[0057] In practice, to ensure the battery maintains optimal operating conditions, a preset SOC (State of Charge) upper limit (also known as full charge SOC) can usually be configured for the battery. When charging the battery, if the estimated SOC reaches the preset SOC upper limit, it is determined that the battery is fully charged, and charging stops. It should be noted that in this article, "charging the battery" can also be referred to as "charging the vehicle."

[0058] When both the preset lower limit and the preset upper limit of the SOC are configured for the battery, the SOC value corresponding to the battery's operation is usually between the preset lower limit and the preset upper limit, so that the battery is in the best working state.

[0059] In practice, the second deviation can be determined based on the actual SOC value, the deceleration specified by regulations, and the preset upper limit of SOC.

[0060] In order to meet the deceleration requirements stipulated by regulations, in some embodiments, the deceleration is generated by regenerating battery energy to meet the deceleration requirements stipulated by regulations.

[0061] In this embodiment of the invention, a State of Charge (SOC) value required for energy recovery is set to facilitate the determination of the second deviation. This ensures that when the battery is in a preset fully charged state, it can recharge during vehicle deceleration to achieve regenerative braking. In other words, even when fully charged, the battery still possesses the ability to regenerate braking energy during deceleration, meeting the deceleration requirements stipulated by regulations. This configured second deviation prevents the phenomenon where the SOC reaches its upper limit during the regenerative braking process as stipulated by regulations, thus hindering normal braking energy recovery.

[0062] In some embodiments, the second deviation can be calculated using the following formula (1). That is, the second deviation, the true SOC value, the estimated SOC value, the SOC value required for energy recovery, and the preset upper limit of SOC satisfy the conditions defined by the following formulas (1) and (2).

[0063] ΔSOC<SOC r -SOC e (1)

[0064] SOC e =SOC f +SOC n (2)

[0065] Where ΔSOC is the second deviation; SOC f This is the preset upper limit of SOC; SOC n The SOC value required for energy regeneration; SOC r This represents the actual SOC value; SOC e This is an estimated value.

[0066] In practice, the specific values ​​of the first or second deviation can be configured according to the vehicle's usage scenario. Different usage scenarios may involve different driving routes and road conditions, thus the configured first and second deviations can vary. In other words, the specific values ​​of the first and second deviations can be configured based on the actual usage scenario of the vehicle. Road conditions can include factors such as road slope and slope length.

[0067] As the battery's usage time increases, the deviation between the estimated SOC and the actual SOC gradually widens. Based on the rate of increase in the cumulative SOC error, the fourth time required for the estimated SOC to exceed the actual SOC by the first deviation can be estimated.

[0068] Based on the rate of increase of the cumulative error of SOC, the fifth time required for the deviation of the estimated SOC value from the actual SOC value to reach the second deviation can be estimated.

[0069] To address the aforementioned issues, in some non-limiting embodiments, the first duration can be determined based on the fourth duration and / or the fifth duration.

[0070] For example, when the allowable deviation of the State of Charge (SOC) includes a first deviation and a second deviation, a fourth duration and a fifth duration can be calculated. In this case, the minimum value between the fourth and fifth durations can be taken as the first duration. Because after the fourth duration, the deviation between the estimated and actual SOC values ​​continues to widen, exceeding the allowable first deviation, the battery may not be able to output the power actually required by the vehicle. After the fifth duration, the deviation between the estimated and actual SOC values ​​continues to widen, exceeding the allowable second deviation, potentially leading to ineffective regenerative braking during vehicle deceleration. Taking the minimum value between the fourth and fifth durations as the first duration avoids the battery failing to output the power actually required by the vehicle and the ineffective regenerative braking during vehicle deceleration, ensuring the normal operation of the battery.

[0071] For example, if the allowable error deviation of the SOC includes the first deviation, the fourth duration can be calculated and used as the first duration.

[0072] For example, if the allowable error deviation of the SOC includes a second deviation, a fifth duration can be calculated and used as the first duration.

[0073] Furthermore, the initial duration is related to factors such as the battery's age, ambient temperature, usage frequency, and charging frequency. For example, as the battery ages, the initial duration can be reduced; a new battery can have a slightly longer initial duration, while an older battery can have a slightly shorter one. Similarly, when the ambient temperature is low, the initial duration can be set shorter; when the battery is at room temperature, the initial duration can be set longer. Moreover, when the battery is used frequently, the frequency of SOC (State of Charge) estimation and the number of charge / discharge cycles within the normal SOC range are also greater, resulting in a larger accumulated error; therefore, a relatively shorter initial duration can be set. Conversely, when the battery is used infrequently, a relatively longer initial duration can be set.

[0074] In practical implementation, the rate of increase of the cumulative SOC error can be pre-configured. When estimating the estimated SOC value of the battery based on the current, the mapping relationship between the battery's usage time and the rate of increase of the cumulative SOC error can be pre-configured. The rate of increase of the cumulative SOC error can be the SOC error corresponding to the battery's usage time.

[0075] In some embodiments, the rate of increase of the cumulative error of SOC can increase linearly or non-linearly.

[0076] In some non-limiting embodiments, the value of the first mileage is related to factors such as the terrain the vehicle is traveling on and the temperature environment of the battery. For example, when the vehicle is traveling on relatively flat terrain, the first mileage can be set to be slightly longer; when the vehicle is traveling on mountainous or rugged terrain, the first mileage can be set to be slightly shorter.

[0077] In some embodiments, the battery power management device 20 of the hybrid vehicle may further include a second refresh charging unit, which performs refresh charging if it is determined that the vehicle driving data has reached a first preset threshold and it is detected that the battery is being charged by an external power source.

[0078] Specifically, when the vehicle's cumulative usage time reaches a first duration, and / or the cumulative mileage reaches a first mileage, and it is detected that the battery is being charged by an external power source, a refresh charge is performed.

[0079] In some non-limiting embodiments, the second refresh charging unit increases the full-charge SOC value from a first SOC value to a second SOC value during charging, and continuously detects whether a charging gun insertion signal is received. When a charging gun insertion signal is detected, a refresh charging request is generated. During the charging process of the battery, the charging voltage of the battery is detected. When the charging voltage reaches a preset first voltage, the SOC value of the battery is corrected to the second SOC value. The charging gun insertion signal is generated when the charging gun input power is detected and powered on.

[0080] For example, during a refresh charging process, inserting the charging gun into the charging port generates a corresponding insertion signal. Upon receiving this signal, the Battery Management System (BMS) sends a high-voltage access (BMS) request to the Vehicle Control System (HV ECU). This BMS request requests high-voltage power to complete the subsequent charging process. Simultaneously, the BMS determines whether the vehicle's cumulative usage time has reached a first set of time. If it has, a refresh charging request is generated, raising the battery's state of charge (SOC) value from the first SOC value to a second SOC value.

[0081] Correspondingly, if the vehicle driving data does not meet the first duration, the HV ECU will allow high voltage to be applied even when using AC / DC charging, but will not generate a refresh charging request.

[0082] In practice, during refresh charging, either a regular charging mode or a fast charging mode can be used, with different charging modes corresponding to different charging interfaces. The charging power of the regular charging mode and the fast charging mode can differ, and can be configured according to needs; no specific limitation is made here. Generally, the charging power of the fast charging mode is greater than that of the regular charging mode. Therefore, when charging the battery to the same amount of capacity, a higher charging power results in a shorter charging time. Users can choose between fast charging mode or regular charging mode based on their actual needs.

[0083] When using an external power source to refresh and charge the battery, either direct current (DC) or alternating current (AC) charging can be used. Refresh charging typically lasts for a considerable period, up to several hours. The completion time depends on the battery's remaining charge (SOC), the charging mode used, and the ambient temperature, among other factors, and is not limited here.

[0084] The first voltage is related to the type of battery and the value of the second SOC. It is understood that the first voltage will vary depending on the type of battery and the value of the second SOC; therefore, no specific value for the first voltage is specified here.

[0085] In practice, after correcting the SOC value of the battery to the second SOC value, the fully charged SOC value can be restored to the first SOC value. Therefore, after correcting the SOC value of the battery, it can continue to operate in an optimal state.

[0086] In this embodiment of the invention, the first SOC value can range from 60% to 80%.

[0087] In a non-limiting embodiment, the first SOC value is 70%, which allows the battery to operate in a better condition while also enabling regenerative braking during downhill driving to ensure driving safety.

[0088] In this embodiment of the invention, the value of the second SOC can range from 80% to 100%.

[0089] In a non-limiting embodiment, the second SOC value is 100%. The first voltage is the voltage corresponding to an SOC value equal to 100%.

[0090] In practice, when refreshing the charging process, the SOC value of the full charge is increased to the second SOC value, which is relatively high. During vehicle operation, especially when going downhill, the excessively high SOC value, particularly when the second SOC value is 100%, will affect regenerative braking. Users will usually need to brake by stepping on the brake pedal. However, braking by using the brake pads can easily lead to overheating of the brake pads, increasing the probability of brake failure and affecting driving safety.

[0091] In this embodiment of the invention, in order to improve driving safety, the second refresh charging unit corrects the SOC value of the battery to the second SOC value and then discharges the battery until the SOC value of the battery drops to the fifth SOC value.

[0092] In practical implementation, the battery can be discharged by supplying power to a designated component. While the battery is supplying power to the designated component, the designated component is controlled to operate at a set power. Based on the set power of the designated component and the discharge current of the battery, the SOC value consumed by the designated component is calculated; based on the SOC value consumed by the designated component, the remaining SOC value of the battery is calculated, until the remaining SOC value of the battery decreases to the fifth SOC value. The fifth SOC value can be the same as or different from the first SOC value.

[0093] In practice, during the process of calling a designated component to discharge the battery, before the second refresh charging unit reduces the battery's SOC value to the fifth SOC value, there may be a situation where the user actively ends the charging process by unplugging the charging gun. If the unplugging operation is detected before the battery's SOC value is reduced to the fifth SOC value, it can be determined that the refresh charging is complete.

[0094] In embodiments of the present invention, the designated component may include at least one of the following: a temperature control device, a water pump, and an air conditioner, etc.

[0095] In practice, batteries are typically equipped with a temperature control device that adjusts the battery temperature. For example, the temperature control device may include a heating module and a cooling module. The heating module heats the battery when its temperature is below a first temperature threshold. The cooling module cools the battery when its temperature is above a second temperature threshold.

[0096] In one embodiment of the present invention, in order to quickly discharge the battery and rapidly reduce it to the fifth SOC value, the temperature control module can be controlled to repeatedly heat up and cool the battery within a set temperature range.

[0097] In another embodiment of the invention, a water pump or a fan can be used to rapidly deplete the battery's charge, thereby increasing the speed at which the battery's charge drops to the fifth state of charge (SOC). The water pump provides the power for water circulation in the cooling module, while the fan is used for heat dissipation.

[0098] In another embodiment of the present invention, when the battery power is rapidly consumed by turning on the air conditioner, the user may turn on the air conditioner.

[0099] In practice, in order to achieve rapid battery discharge, the set power of a designated component can be greater than the power under normal default operating conditions, as long as the designated component is in a safe operating mode.

[0100] In specific implementations, the fifth SOC value can range from 60% to 80%.

[0101] In one non-limiting embodiment, the fifth SOC value is 70%.

[0102] In other embodiments, performing a refresh charge on the battery may specifically include: reducing the fully discharged SOC value from a third SOC value to a fourth SOC value; detecting the discharge voltage of the battery; and when the discharge voltage is detected to reach a preset second voltage, correcting the SOC value of the battery to the fourth SOC value. Thereafter, the battery is charged until its SOC value reaches the full charge SOC.

[0103] In practice, after the battery SOC value correction is completed, the fully discharged SOC value is restored to the third SOC value. This is to avoid frequent full discharge of the battery during subsequent use, which would affect the battery's lifespan.

[0104] In this embodiment of the invention, the third SOC value ranges from 0% to 20%.

[0105] In a non-limiting embodiment, the third SOC value is 0. The second voltage is the voltage corresponding to an SOC value of 0.

[0106] In a specific implementation, the battery power management device of the hybrid vehicle further includes a first refresh charging unit (not shown in the figure). The judgment unit is also used to determine whether the vehicle driving data has reached a second preset threshold; the first refresh charging unit is used to perform refresh charging when it is determined that the vehicle driving data has reached the second preset threshold and when it is detected that the battery is being charged by an external power source, so as to correct the SOC value of the battery, wherein the second preset threshold is less than the first preset threshold.

[0107] That is, as the cumulative usage time and cumulative mileage of the vehicle increase, a second preset threshold can be determined before the vehicle's mileage data reaches a first preset threshold. Once the vehicle's mileage data reaches the second preset threshold, to ensure the normal operation of the battery and the vehicle, a refresh charge is performed at an appropriate time, such as when external power is detected charging the vehicle. The second preset threshold can be determined based on the offset of the battery's estimated State of Charge (SOC). The SOC offset is positively correlated with the vehicle's cumulative usage time or cumulative mileage.

[0108] When the vehicle driving data includes the vehicle's cumulative usage time, the second set threshold includes a preset second duration. When the vehicle driving data includes the cumulative mileage, the second set threshold includes a preset second mileage.

[0109] In specific implementation, the first refresh charging unit is used to perform refresh charging when it is determined that the cumulative usage time of the vehicle has reached a preset second duration; and / or, to perform refresh charging when it is determined that the cumulative mileage has reached a preset second mileage.

[0110] For example, the first duration is set to 40 hours, and the second duration is set to 20 hours. When the vehicle's cumulative usage time reaches 20 hours, and the first refresh charging unit detects that the battery is being charged using an external power source, a refresh charging operation can be performed. This allows for refresh charging to be performed before the vehicle's driving data reaches a first preset threshold, even when the user is charging the vehicle with an external power source, thus eliminating accumulated SOC errors. If the vehicle's cumulative usage time reaches 40 hours without a refresh charging operation, a refresh charging reminder will be issued.

[0111] Correspondingly, when the vehicle driving data does not reach the second preset threshold, the deviation of the battery's estimated SOC value is relatively small, and the impact on the driving force during vehicle driving and the starting effect at extremely low temperatures is small. At this time, even if the user uses an external power source to charge the vehicle, it can be charged without triggering a refresh charge, so as to complete the charging of the vehicle in a shorter time and improve the user experience.

[0112] For example, the first mileage is set to 1000 kilometers, and the second mileage is set to 500 kilometers. When the vehicle's cumulative mileage reaches 500 kilometers, and the first refresh charging unit detects external power charging the battery, refresh charging can be performed. If the cumulative mileage reaches 1000 km and refresh charging has not been performed, a refresh charging reminder will be output.

[0113] In some non-limiting embodiments, the first refresh charging unit is used to increase the full-charge SOC value during charging from a first SOC value to a second SOC value, and detect the charging voltage of the battery during charging. When the charging voltage is detected to reach a preset first voltage, the SOC value of the battery is corrected to the second SOC value, where the first voltage is the voltage corresponding to the second SOC value. Alternatively, the full-discharge SOC value during discharging is decreased from a third SOC value to a fourth SOC value, the discharging voltage of the battery is detected, and when the discharging voltage is detected to reach a preset second voltage, the SOC value of the battery is corrected to the fourth SOC value, and the battery is charged until the SOC value of the battery reaches the full-charge SOC value; where the second voltage is the voltage corresponding to the fourth SOC value.

[0114] In practice, when the battery is being refreshed and charged, the indicator light on the charging port will illuminate. Once the refresh charging is complete, the indicator light on the charging port will turn off. This allows users to intuitively understand the progress of the refresh charging.

[0115] In a specific implementation, the battery power management device of the hybrid vehicle further includes a reset unit, which is used to reset the vehicle driving data to initial data when the refresh charging is detected to be completed. The initial data includes: the cumulative usage time of the vehicle as the initial duration and / or the cumulative mileage as the initial mileage.

[0116] For example, the initial duration can be reset to 0, or the initial duration can be reset to any value. Similarly, the initial mileage can be reset to 0, or the initial mileage can be reset to any value.

[0117] The first refresh charging unit and the second refresh charging unit can be the same unit or different units. The specific refresh charging scheme of the first refresh charging unit can be found in the description of the specific scheme of the second refresh charging unit, and will not be repeated here. The first refresh charging unit and the second refresh charging unit can be part of a charging system with multi-stage charging upper limits divided according to control, or they can be independent units from the charging system with multi-stage charging upper limits divided according to control.

[0118] In a specific implementation, the battery power management device for the hybrid vehicle further includes: a second acquisition unit, a calculation unit, and a display unit.

[0119] The second acquisition unit is further configured to detect that no refresh charging has been performed when the vehicle driving data reaches a first preset threshold, and acquire a third preset threshold.

[0120] The calculation unit is used to calculate the remaining data based on the vehicle driving data at the current moment and the third set threshold vehicle driving data. The remaining data includes: the remaining usage time and / or the remaining driving mileage of the vehicle.

[0121] The display unit is used to display the remaining energy data. The remaining energy data allows the user to intuitively understand the remaining usage time or remaining driving range of the vehicle before a refresh charge is required.

[0122] The third set threshold includes the third duration and the third mileage. The remaining usage time of the vehicle is obtained by subtracting the cumulative usage time of the vehicle at the current moment from the third duration; the vehicle mileage is obtained by subtracting the cumulative mileage at the current moment from the third mileage.

[0123] For example, if the third duration is 100 hours, the vehicle's cumulative usage time at the current moment is 85 hours, and the vehicle has 15 hours of remaining usage time. If the third mileage is 2500 kilometers, the vehicle's cumulative mileage at the current moment is 1900 kilometers, then the remaining mileage is 600 kilometers.

[0124] In a specific implementation, the execution unit 203 is also used to perform a refresh charging reminder operation again when it is determined that the vehicle driving data has reached a third set threshold, wherein the third set threshold is greater than the first set threshold.

[0125] In practical implementation, when vehicle driving data includes cumulative vehicle usage time, the third set threshold includes a third duration. When vehicle driving data includes cumulative mileage, the third set threshold includes a third mileage. The third duration is 100 hours, but can also be any other value greater than the first duration, specifically set according to the tolerance for deviations in the battery's estimated SOC value. The third mileage can be 2500 kilometers, or any other value greater than the first mileage, specifically set according to the tolerance for deviations in the battery's estimated SOC value.

[0126] When vehicle driving data reaches the third preset threshold, the estimated State of Charge (SOC) value deviates significantly, and the SOC is prone to sudden changes. Continued use in this situation can easily lead to insufficient driving force and difficulty starting in extremely low temperatures. By re-executing the refresh charging reminder, the user is prompted to refresh the charging process in a timely manner to correct the battery's SOC, eliminating or reducing accumulated errors during battery use. This effectively avoids insufficient driving force during vehicle operation and difficulty starting the vehicle in extremely low temperatures caused by excessive SOC errors.

[0127] Reference Figure 3This invention provides a timing diagram of the operation of a battery power management device for a hybrid vehicle according to an embodiment of the present invention. This embodiment uses the cumulative usage time of the vehicle as an example for illustration.

[0128] T0 is the initial duration reset since the last refresh charging was completed. Before reaching the second duration, that is, between T0 and T2, the SOC offset of the battery is relatively small, and refresh charging is not required. At this time, the charging time can be completed in just a few minutes, which can effectively shorten the charging time.

[0129] As the battery is used and the vehicle's cumulative usage time increases, when the second duration T2 is reached, if it is detected that the battery is being charged by an external power source, a refresh charge can be performed to correct the SOC.

[0130] If the vehicle's cumulative usage time reaches the first duration and no refresh charging is detected, a refresh charging reminder will be issued. Subsequently, if the vehicle's cumulative usage time exceeds the first duration and an external power source is detected to charge the battery, a refresh charging can be issued.

[0131] If the vehicle's cumulative usage time exceeds the first set time and no external power supply is detected for battery refresh charging, a refresh charging reminder will be executed again when the vehicle's cumulative usage time reaches the third set time. This is to remind the user to perform a refresh operation as soon as possible to avoid affecting the vehicle's driving force and starting in extremely low temperatures due to a large deviation in the battery's estimated SOC value. After this, if external power supply charging of the battery is detected, refresh charging can be performed.

[0132] This invention also provides a battery power management method for hybrid vehicles. The hybrid vehicles to which this battery power management method is applicable are equipped with a power generation unit and a battery, can be charged by an external power source, and have a charging system that divides the charging upper limit into multiple stages according to control.

[0133] Reference Figure 4 The present invention provides a flowchart of a battery power management method for a hybrid vehicle according to an embodiment of the present invention. The battery power management method for a hybrid vehicle may specifically include the following steps:

[0134] Step S1: Obtain vehicle driving data.

[0135] In specific implementation, the vehicle driving data includes: the cumulative vehicle usage time and / or cumulative mileage calculated from the last time the battery was refreshed before charging was completed.

[0136] Step S2: Determine whether the vehicle driving data has reached the first set threshold.

[0137] Step S3: When it is determined that the vehicle driving data has reached the first set threshold, a refresh charging reminder operation is performed to remind the user to perform SOC value correction.

[0138] As shown above, for hybrid vehicles equipped with a generator unit and a battery that can be charged via an external power source, vehicle driving data is acquired. This data includes the cumulative usage time and / or cumulative mileage of the vehicle since the battery completed its last refresh charging. When the vehicle driving data reaches a first preset threshold, a refresh charging reminder is executed to prompt SOC correction. For hybrid vehicles equipped with a generator unit and a battery, since the generator unit typically charges the battery and the power required for vehicle operation is usually provided by the battery, vehicle driving data, such as cumulative usage time and cumulative mileage, can indirectly characterize the battery's usage status. The battery's SOC estimation error increases with battery usage time. Therefore, determining the refresh charging reminder time based on vehicle driving data can help vehicle users easily know when to refresh the battery for SOC correction, thus contributing to the normal use of the battery.

[0139] In specific implementation, the battery power management method of the hybrid vehicle corresponds to the battery power management device of the hybrid vehicle. For the specific working principle and workflow of the battery power management method of the hybrid vehicle, please refer to the description of the battery power management device of the hybrid vehicle in the above embodiments, which will not be repeated here.

[0140] This disclosure also provides a computer-readable storage medium, which is a non-volatile or non-transient storage medium, storing a computer program thereon. When the computer program is run by a processor, it executes the steps of the battery power management method for a hybrid vehicle provided in any of the above embodiments of this disclosure.

[0141] This disclosure also provides a terminal, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the steps of the battery power management method for hybrid vehicles provided in any of the above embodiments of this disclosure when running the computer program.

[0142] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in any computer-readable storage medium, which may include ROM, RAM, disk, or optical disk, etc.

[0143] The above-described embodiments have revealed the technical content and features of this disclosure, and the descriptions are relatively specific and detailed. However, the descriptions of the above embodiments are illustrative rather than restrictive. Under the inventive concept of this disclosure, those skilled in the art can make various changes and improvements to the above-disclosed concept, but all of these fall within the protection scope of this disclosure. Therefore, the protection scope of this disclosure is determined by the claims.

Claims

1. A battery power management device for a hybrid vehicle, the hybrid vehicle being equipped with a generator unit and a battery, capable of being charged by an external power source, and having a charging system that controls and divides charging limits into multiple stages, characterized in that... The battery power management device includes: The first acquisition unit is used to acquire vehicle driving data, which includes: the cumulative vehicle usage time calculated from the last refresh charging time before the battery was completed. The judgment unit is used to determine whether the vehicle driving data has reached a first preset threshold; and The execution unit is used to perform a refresh charging reminder operation when it is determined that the vehicle driving data has reached a first preset threshold, so as to remind the user to perform SOC value correction. The first set threshold includes a preset first duration, which is determined based on the rate of increase of the battery's cumulative SOC error and the allowable deviation of the SOC error. The allowable deviation of the SOC error includes a first deviation and a second deviation. The first deviation is the maximum deviation of the allowed estimated SOC value from the actual SOC value; the second deviation is the maximum deviation of the allowed estimated SOC value from the actual SOC value.

2. The battery power management device for a hybrid vehicle as described in claim 1, characterized in that, The execution unit is configured to perform at least one of the following operations to refresh the charging reminder: The indicator lights on the control panel are flashing; Display reminder information on the dashboard or in-vehicle device display interface; Output voice reminder messages.

3. The battery power management device for a hybrid vehicle as described in claim 1, characterized in that, It also includes the first refresh charging unit; The judgment unit is also used to determine whether the vehicle driving data has reached a second preset threshold. The first refresh charging unit is used to perform refresh charging when it is determined that the vehicle driving data has reached a second set threshold and when it is detected that the battery is being charged by an external power source, so as to correct the SOC value of the battery. The second set threshold is less than the first set threshold.

4. The battery power management device for a hybrid vehicle as described in claim 3, characterized in that, The first refresh charging unit is used to increase the full charge SOC value during charging from the first SOC value to the second SOC value, and to detect the charging voltage of the battery during the charging process. When the charging voltage reaches the preset first voltage, the SOC value of the battery is corrected to the second SOC value. Alternatively, the full discharge SOC value is reduced from the third SOC value to the fourth SOC value, the discharge voltage of the battery is detected, and when the discharge voltage reaches the preset second voltage, the SOC value of the battery is corrected to the fourth SOC value, and the battery is charged until the SOC value of the battery reaches the full charge SOC.

5. The battery power management device for a hybrid vehicle as described in claim 1 or 4, characterized in that, The vehicle driving data also includes the cumulative mileage calculated from the last time the battery was fully charged.

6. The battery power management device for a hybrid vehicle as described in claim 5, characterized in that, It also includes a reset unit, which is used to reset the vehicle driving data to initial data when the refresh charging is detected to be completed. The initial data includes: the vehicle's cumulative usage time as the initial duration and / or the cumulative mileage as the initial mileage.

7. The battery power management device for a hybrid vehicle as described in claim 1, characterized in that, It also includes a second refresh charging unit, which performs refresh charging if it is determined that the vehicle driving data has reached a first set threshold and it is detected that the battery is being charged by an external power source.

8. The battery power management device for a hybrid vehicle as described in claim 1, characterized in that, The execution unit is further configured to perform a refresh charging reminder operation again when it is determined that the vehicle driving data has reached a third preset threshold, wherein the third preset threshold is greater than the first preset threshold.

9. A battery power management method for a hybrid vehicle, wherein the hybrid vehicle is equipped with a generator unit and a battery, can be charged by an external power source, and has a charging system that divides the charging upper limit into multiple stages according to control, characterized in that, The method includes: Acquire vehicle driving data, which includes: the cumulative vehicle usage time calculated from the last refresh charging time before the battery was fully charged; Determine whether the vehicle driving data has reached a first preset threshold; When it is determined that the vehicle driving data has reached the first set threshold, a refresh charging reminder operation is performed to remind the user to perform SOC value correction. The first set threshold includes a preset first duration, which is determined based on the rate of increase of the battery's cumulative SOC error and the allowable deviation of the SOC error. The allowable deviation of the SOC error includes a first deviation and a second deviation. The first deviation is the maximum deviation of the allowed estimated SOC value from the actual SOC value; the second deviation is the maximum deviation of the allowed estimated SOC value from the actual SOC value.

10. A computer-readable storage medium, said computer-readable storage medium being a non-volatile storage medium, having stored thereon a computer program, characterized in that, The computer program, when run by the processor, executes the steps of the battery power management method for a hybrid vehicle as described in claim 9.

11. A terminal comprising a memory and a processor, wherein the memory stores a computer program capable of running on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the battery power management method for a hybrid vehicle as described in claim 9.

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