A charging control method, device and medium for a power battery

Abstract

This application discloses a charging control method, device, and medium for a power battery. The method includes: acquiring the initial charging start time, SOC threshold, and user travel time of the vehicle's power battery; when a first duration is less than a second duration, controlling the power battery to charge from the initial charging start time to the SOC threshold and then stopping charging; determining the second charging start time of the power battery based on the user travel time; and controlling the power battery to continue charging from the second charging start time to the full SOC value. The first duration is the time required to charge from the initial charging start time to the full SOC value, and the second duration is the time between the initial charging start time and the user's travel time. Therefore, by combining the user's travel time with the charging stop time after reaching the SOC threshold, allowing the battery to rest until the second charging start time, and then recharging until full charge, the power battery reaches full charge closer to the user's travel time, reducing the time the power battery spends at full SOC.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a charging control method, device and medium for a power battery. Background Technology

[0002] With the continuous development of new energy technologies, electric vehicles are increasingly popular due to their advantages such as environmental friendliness, low noise, and energy efficiency. As a core component of electric vehicles, the power battery provides the primary power source. Therefore, the performance and quality of the power battery directly affect the vehicle's range, safety, and lifespan, making it a crucial research area.

[0003] When charging the power battery, users often fail to disconnect the charging gun in time after the battery is fully charged, causing the power battery to remain in a high-charge state (SOC) for an extended period, meaning it is in a state close to or fully charged for a prolonged time. This increases the internal pressure and stress of the power battery, activates the chemical substances, and thus accelerates battery aging, affecting its lifespan. In other words, it leads to a decline in battery capacity and performance, ultimately impacting the overall vehicle performance.

[0004] Therefore, how to avoid the power battery being in a high SOC state for a long time, which would lead to capacity degradation and performance decline, and thus ensure the service life of the power battery and improve the overall vehicle performance, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, one aspect of this application provides a charging control method for a power battery, the method comprising:

[0006] Obtain the vehicle's first charging start time, SOC threshold, and user travel time;

[0007] When the first duration is less than the second duration, the power battery is controlled to charge from the first charging start time to the SOC threshold and then charging is stopped; and the second charging start time of the power battery is determined according to the user's travel time.

[0008] The power battery is controlled to continue charging to full charge SOC value from the second charging start time; wherein, the first duration is the duration required to charge to full charge SOC value from the first charging start time, and the second duration is the duration between the first charging start time and the user's travel time.

[0009] Optionally, before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included:

[0010] When the user's travel time is the predicted time, determine whether the predicted time is within the preset travel time range;

[0011] If the second charging start time is determined based on the predicted time within the preset travel time range;

[0012] If the travel time is outside the preset travel time range, proceed with the following steps:

[0013] Determine whether the first duration is less than the third duration; the third duration is the duration between the first charging start time and the specified time, and the specified time is less than the minimum time of the preset travel time range;

[0014] If it is less than the third duration, the second charging start time is determined according to the specified time.

[0015] Optionally, before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included:

[0016] When the user's travel time is the time specified by the user, determine whether the second duration is less than the preset duration;

[0017] If the time is less than the preset duration, the second charging start time is determined according to the user-specified time.

[0018] If the duration is not less than the preset time, perform the following steps:

[0019] Determine whether the current SOC value of the power battery is less than a preset value; wherein the preset value is less than the SOC threshold.

[0020] If the value is less than the preset value, execute the step of controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, and the subsequent steps.

[0021] If the current SOC value is not less than the preset value, wait for the current SOC value to decrease to less than the preset value, and then execute the step of controlling the power battery to charge from the initial charging time to the SOC threshold and then stopping charging, as well as subsequent steps.

[0022] Optionally, the charging time from the second charging start time to the full charge SOC value does not exceed the user's travel time, and there is a specified remaining time before the user's travel time.

[0023] Optionally, controlling the power battery to continue charging to full SOC value from the second charging start time includes:

[0024] The power battery is controlled to trickle charge to the full charge SOC value starting from the second charging start time.

[0025] Optionally, the charging control method for the power battery further includes:

[0026] Obtain historical charging data of the power battery within a specified period; wherein the historical charging data includes at least the energy decay data of the power battery during the period when charging was stopped;

[0027] The SOC threshold is adjusted based on the historical charging data.

[0028] Optionally, before obtaining the first charging time of the vehicle's power battery, the SOC threshold, and the user's travel time, the method further includes:

[0029] If a scheduled charging instruction is received, the start time of the scheduled charging instruction is taken as the first start time; and the process proceeds to the step of obtaining the first start time of the vehicle's power battery, the SOC threshold, and the user's travel time, and then executes the subsequent steps.

[0030] Another aspect of this application provides a charging control device for a power battery, the device comprising:

[0031] The acquisition module is used to acquire the first charging time of the vehicle's power battery, the SOC threshold, and the user's travel time;

[0032] The initial charging control module is used to control the power battery to charge from the initial charging start time to the SOC threshold and then stop charging when the first duration is less than the second duration; and to determine the second charging start time of the power battery based on the user's travel time.

[0033] A secondary charging control module is used to control the power battery to continue charging to full charge SOC value from the secondary charging start time; wherein, the first duration is the duration required to charge to full charge SOC value from the first charging start time, and the second duration is the duration between the first charging start time and the user's travel time.

[0034] Another aspect of this application provides a charging control device for a power battery, including a memory and a processor. The memory stores a computer program that can run on the processor, and when the processor executes the program, it implements the steps of the charging control method for the power battery.

[0035] Another aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the charging control method for the power battery.

[0036] The charging control method, device, and medium for a power battery provided in this application have the following beneficial effects: by combining the user's travel time, the charging of the power battery is stopped after it reaches the SOC threshold, and it is left to stand for a period of time until the second charging time, and then it is charged again until it reaches full SOC. This makes the power battery reach full SOC closer to the user's travel time, reduces the time the power battery is at full SOC, and extends the service life of the power battery. Attached Figure Description

[0037] Figure 1 This is a schematic flowchart illustrating a charging control method for a power battery provided in an embodiment of this application.

[0038] Figure 2 This is a schematic diagram illustrating the principle of a charging control method for a power battery provided in an embodiment of this application.

[0039] Figure 3 A schematic diagram illustrating the principle of another power battery charging control method provided in this application embodiment;

[0040] Figure 4 A schematic flowchart illustrating a charging control method for a power battery according to another embodiment of this application;

[0041] Figure 5 This is a schematic diagram illustrating data interaction between the vehicle and the cloud, provided as an embodiment of this application.

[0042] Figure 6 This is a schematic diagram of the structure of a power battery charging control device provided in an embodiment of this application;

[0043] Figure 7 This is a schematic diagram of the structure of a power battery charging control device provided in another embodiment of this application.

[0044] The reference numerals in the attached diagram are as follows: 70 is memory, 71 is processor, 72 is display screen, 73 is input / output interface, 74 is communication interface, 75 is power supply, 76 is communication bus, 701 is computer program, 702 is operating system, and 703 is data. Detailed Implementation

[0045] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0046] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0047] Figure 1 This is a schematic flowchart of a charging control method for a power battery provided in an embodiment of this application, as shown below. Figure 1 As shown, the method includes:

[0048] S10: Obtain the first charging time of the vehicle's power battery, the SOC threshold, and the user's travel time;

[0049] In a specific embodiment, after the user connects the vehicle to the charging gun, the vehicle automatically detects and confirms that the charging gun is connected. At this time, the initial charging start time and SOC threshold of the vehicle's power battery are obtained, along with the user's travel time. It can be understood that the initial charging start time refers to the first charging of the power battery after connecting the charging gun.

[0050] The SOC threshold is used as the stopping condition for the power battery to start its first charge. The user's travel time can be a time specified by the user or a time predicted by obtaining the vehicle's historical travel data from the cloud. This application does not limit this.

[0051] It should be noted that the charging control method provided in this application can be implemented by either a vehicle controller or a domain controller; this application does not limit the implementation in this regard. In fact, in practical applications, the charging control method provided in this application can be applied to charging control in other fields.

[0052] Furthermore, it should be noted that the vehicles to which the method provided in this application can be applied may include, but are not limited to, passenger cars, sport utility vehicles (SUVs), multi-purpose vehicles (MPVs), off-road vehicles, pickup trucks, or other power-driven, non-rail-borne vehicles, and the provided vehicles may be powered by a battery.

[0053] S11: When the first duration is less than the second duration, control the power battery to stop charging after charging to the SOC threshold from the first charging start time; and determine the second charging start time of the power battery according to the user's travel time; wherein, the first duration is the time required to charge to the full SOC value from the first charging start time, and the second duration is the time between the first charging start time and the user's travel time;

[0054] Furthermore, a first duration is determined, which is the time required for the battery to charge to full SOC value from the initial charging start time. That is, the duration required for the power battery to continuously charge until it is fully charged from the moment the vehicle is connected to the charger. This is denoted as the first duration. Simultaneously, a second duration is determined, which is the time from the moment the power battery is connected to the charger to the user's next trip. This is denoted as the second duration.

[0055] If the first duration is shorter than the second duration, it indicates that the time required for the power battery to be continuously charged to full charge is less than the time between the charging time and the user's travel time. In other words, it indicates that the power battery can be fully charged before the user's travel.

[0056] At this point, to avoid the power battery being fully charged to its SOC value and then left idle for a long time before the user uses the vehicle, i.e., to avoid the power battery being in a fully charged state for an extended period of time, in one optional embodiment, after determining that the first duration is less than the second duration, the power battery is first controlled to charge to the SOC threshold from the initial charging start time and then stopped charging. That is, the power battery is controlled to charge until the SOC threshold is reached after the charging connection is established and then the charging connection is disconnected.

[0057] Specifically, the SOC threshold is lower than the full-charge SOC value. This means the charging process is divided into two stages, with a period of inactivity between each stage. Furthermore, the sum of the charging time and inactivity time for both stages is less than the second stage duration.

[0058] Specifically, the first stage involves charging the power battery to the SOC threshold; that is, the power battery is not fully charged in the first stage, and charging stops once the SOC threshold is reached. Simultaneously, the timing of the second charging cycle is determined based on the user's travel schedule.

[0059] Specifically, it is necessary to determine the target time required to charge from the SOC threshold to the full SOC value, and then, in conjunction with the user's travel time and the target time, determine the time to start the second charging phase. That is, to determine the time node for the second phase of charging to begin.

[0060] Understandably, in order to achieve a full charge of the power battery and avoid the power battery remaining at its full charge SOC value for an extended period, the timing of the second charging start must be determined to ensure that the third charging session after the second start time does not exceed the user's travel time. In other words, the power battery must reach its full charge SOC value close to the user's travel time.

[0061] S12: Controls the power battery to continue charging from the second charging start time to the full charge SOC value.

[0062] Furthermore, after the power battery completes the first stage of charging and reaches the SOC threshold, charging is stopped and the battery is left to stand until the second charging start time. The second stage of charging then begins from the second charging start time. In the second stage of charging, the power battery continues to charge from the SOC threshold until it reaches the full charge SOC value.

[0063] Figure 2 This is a schematic diagram illustrating the principle of a charging control method for a power battery provided in an embodiment of this application. For ease of understanding, the following will be combined with... Figure 2 Please provide an explanation.

[0064] like Figure 2 As shown, in charging strategy 1, point A1 is the initial charging start time of the power battery, A2 is the time when the power battery reaches its full charge SOC value, and A3 is the user's travel time. Under charging strategy 1, the power battery begins uninterrupted charging from point A1, that is, it continues charging until it reaches the full charge SOC value at point A2. At this time, the power battery remains at its full charge SOC value from point A2 to point A3.

[0065] like Figure 2 As shown, in charging strategy 2 (i.e., the charging strategy corresponding to the charging control method for the power battery provided in this application), point B1 is the initial charging start time of the power battery, which is the same time as point A1 in charging strategy 1. Point B2 is when the power battery is charged to the SOC threshold, that is, the SOC of the power battery is equal to the SOC threshold at this time. Point B3 is the second charging start time, and point B4 is the time when the power battery reaches the full charge SOC value. Point B5 is the user's travel time, that is, the same time as point A3 in charging strategy 1.

[0066] In charging strategy 2, the power battery first undergoes the first stage of charging, that is, charging from the initial charging start point B1 to point B2 when the SOC threshold is reached, and then stopping charging after point B2, remaining idle for the period from B2 to B3. Then, the second stage of charging begins from the second charging start point B3, until the battery is charged to the full SOC value B4.

[0067] Obviously, through Figure 2It can be seen that, compared to charging strategy 1, the charging strategy of this application results in the power battery being fully charged closer to the user's travel time at point B5. That is, the duration of the power battery at full charge SOC under strategy 2 (B4-B5) is shorter than the duration of the power battery at full charge SOC (A2-A3) under strategy 1.

[0068] Figure 3 This is a schematic diagram illustrating the principle of another power battery charging control method provided in this application embodiment. To make the technical solution of this application clearer to those skilled in the art, the following will be combined with... Figure 3 Let's illustrate with examples.

[0069] like Figure 3 As shown, for example, in one optional embodiment, the user's travel time is 8:00 AM, and the vehicle is connected to the charging gun at 8:00 PM, that is, the first charging time is 8:00 PM, at which time the vehicle's remaining SOC value is 30%. The vehicle's SOC threshold is 90%, and the time required to charge from the SOC threshold to the full SOC value (i.e., 100%) is 2 hours.

[0070] In a specific charging embodiment, the vehicle starts charging at 8:00 PM and continues charging continuously for 6 hours. At 2:00 AM, the State of Charge (SOC) reaches the SOC threshold, meaning the SOC has been charged from 30% to 90%. At this point, to reduce the duration of the battery being fully charged, the charging process is stopped.

[0071] Since it takes 2 hours to charge from the SOC threshold to the full SOC value, the second charging start time is 5:00 AM. That is, the vehicle stops charging at 2:00 AM and is left to stand still until 5:00 AM. At 5:00 AM, it enters the second stage of charging of the power battery. After charging for 2 hours, the SOC is charged from 90% to 100% at 7:00 AM.

[0072] Therefore, if a user uses the vehicle at 8:00 AM, the vehicle will be fully charged by 7:00 AM, meaning that the vehicle's SOC will reach 100% at 7:00 AM. This means that the power battery will remain fully charged for one hour, close to the user's travel time, reducing power battery capacity loss and ensuring the lifespan of the power battery.

[0073] Therefore, the charging control method for the power battery provided in this application embodiment, by combining the user's travel time, stops charging the power battery after it is charged to the SOC threshold, and lets it stand for a period of time until the second charging time, and then starts charging again until it is fully charged to SOC. This makes the power battery reach full charge SOC closer to the user's travel time, reduces the time the power battery is at full charge SOC, and extends the service life of the power battery.

[0074] Figure 4This is a schematic flowchart illustrating a charging control method for a power battery, provided as another embodiment of this application. As an optional embodiment, such as... Figure 4 As shown, before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included:

[0075] S40: When the user's travel time is the predicted time, determine whether the predicted time is within the preset travel time range; if it is within the preset travel time range, execute step S41; if it is not within the preset travel time range, execute steps S42 and S43.

[0076] In one optional embodiment, the user's travel time can be set by the user themselves, that is, the user can specify a time. In another optional embodiment, the user's travel time can also be a predicted time based on the user's historical travel data.

[0077] Figure 5 This is a schematic diagram illustrating data interaction between a vehicle and the cloud, provided as an embodiment of this application. In one optional embodiment, such as... Figure 5 As shown, when the vehicle determines that the first duration is less than the second duration between the first charging start time and the user's travel time, it will send a signal to the cloud indicating that the intermittent charging control method of this application can be implemented. The intermittent charging method refers to the charging method provided in this application that divides the charging of the power battery into two stages and stops charging for a period of time between the two stages.

[0078] After receiving the intermittent charging information from the vehicle, the cloud sends the user's historical travel data to the vehicle via TCAM. This historical travel data may include, but is not limited to, user profiles, travel date attributes, travel time attributes, travel weather, historical travel habits, and the time the user disconnects the charging gun before departure. Travel date attributes refer to labels such as whether the travel date is a weekday or a holiday, while travel time attributes refer to labels such as whether the travel time falls within the morning rush hour. This multi-dimensional labeling improves the accuracy of predicting user travel time.

[0079] In one optional embodiment, user travel time can be predicted using a time series regression model. It is worth noting that, in a specific embodiment, predicting user travel time can be done as follows: Figure 5 As shown, the process is completed in the cloud. After obtaining the predicted user travel time, the predicted time is sent to the vehicle so that the vehicle can plan the charging of its power battery. Of course, in another optional embodiment, the user's historical travel data can also be sent to the vehicle. Since the prediction is completed by the vehicle, this application does not limit this approach.

[0080] Furthermore, after obtaining the user's travel time, the vehicle determines whether the travel time falls within the preset travel time range. It's understandable that the predicted user travel time might be inaccurate, or the predicted travel time might be many days in advance. Charging the power battery based on inaccurate predictions would inevitably affect the reliability of the power battery charging.

[0081] Therefore, in order to solve this technical problem, in a specific embodiment, when the user's travel time is the predicted time, it is necessary to determine whether the predicted time is within the preset travel time range. In an optional embodiment, the time difference between the preset time range and the first charging time of the power battery can be set to be less than 24 hours, thereby ensuring that the predicted time will not be many days later.

[0082] If the predicted time is within the preset time range, it indicates that the current predicted user travel time is highly reliable, i.e., with high confidence. At this point, the power battery can be charged using the intermittent charging method provided in this application, and step S41 can be executed.

[0083] However, if the predicted time is outside the preset time range, it indicates low reliability of the currently predicted user travel time, i.e., low confidence. In this case, to ensure the reliability of the power battery charging, such as... Figure 4 As shown, proceed to step S42.

[0084] S41: Determine the second charging start time based on the predicted time;

[0085] When the predicted time is reliable, the timing of the second charging start needs to be determined based on the user's travel time to ensure that the power battery reaches its full charge SOC value close to the user's travel time. Specifically, the calculation of the second charging start time is based on the principle that the time from the second charging start time to the full charge SOC value does not exceed the predicted time.

[0086] S42: Determine whether the first duration is less than the third duration; wherein, the third duration is the duration between the initial charging time and the specified time, and the specified time is less than the minimum time of the preset travel time range; if it is less than the third duration, proceed to step S43;

[0087] S43: Determine the time for the second charging start based on the specified time.

[0088] In another alternative embodiment, if the predicted time is unreliable, the battery can be charged using an alternative method to avoid the power battery being in a fully charged state for a long time while ensuring the reliability of power battery charging.

[0089] Specifically, first determine whether the first time required for the power battery to charge to full SOC value from the first charging start time is less than the third time between the first charging start time and the specified time, where the specified time is less than the minimum time of the preset travel time range.

[0090] The scheme of charging according to a specified time can be understood as a fallback scheme when the confidence of the predicted time is low. Under this scheme, the power battery must complete intermittent charging before the specified time, that is, the power battery must be charged to the full SOC value at or before the specified time.

[0091] In one optional embodiment, if the first duration is less than the third duration between the initial charging start time and the specified time, it indicates that the power battery can be charged before the specified time using the intermittent charging method provided in this application. In this case, the second charging start time of the power battery is calculated based on the specified time.

[0092] When calculating the second charging start time based on a specified time, it is necessary to ensure that the power battery reaches its full charge SOC value close to the specified time. That is, from the start of the second charging start time to the full charge SOC value, the charging time should not exceed the specified time.

[0093] In another optional embodiment, if the first duration is not less than the third duration, it means that even if the power battery is continuously charged from the initial charging start time, it cannot reach the full charge SOC value before the specified time, and therefore intermittent charging is even less possible before the specified time. In this case, the power battery is controlled to start charging to the full charge SOC value from the current time, that is, the power battery is continuously charged from the initial charging start time until the full charge SOC value is reached or the user's travel time is reached.

[0094] It is worth noting that regardless of the reliability of the predicted user travel time (i.e., whether the confidence level meets expectations), the intermittent charging method provided in this application can be used to charge the power battery as long as the first duration is shorter than the second duration. The difference lies in that when the confidence level of the predicted time is high, the second charging start time can be calculated based on the predicted time; conversely, when the confidence level of the predicted time is low, the second charging start time needs to be calculated based on a specified time. In other words, under the condition that the first duration is shorter than the second duration, the intermittent charging method can be used to charge the power battery regardless of the reliability of the predicted time; only the timing of the second charging start point differs.

[0095] Of course, if the first duration is not less than the second duration, it means that intermittent charging cannot be performed before the user's travel time. That is, the time length before the user's travel time is insufficient to complete one intermittent charging. In this case, the power battery is controlled to charge continuously from the first charging start time until it reaches the full charge SOC value or the user's travel time is reached.

[0096] Further, such as Figure 4 As shown, after determining the second charging start time, when the power battery completes the first stage of charging and is left to stand for a period of time until the second charging start time, the power battery is controlled to start the second stage of charging from the second charging start time until the second charging start time.

[0097] Therefore, the charging control method for power batteries provided in this application pre-sets a preset time range to avoid affecting the charging reliability of the power battery when the predicted user travel time is unreliable. That is, an alternative charging strategy is set. When the confidence level of the predicted user travel time is low, the alternative charging strategy is used to avoid the power battery being fully charged during the charging time while ensuring charging reliability.

[0098] In one optional embodiment, before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included:

[0099] When the user's travel time is the time specified by the user, determine whether the second duration is less than the preset duration;

[0100] If the time is less than the preset duration, the time for the second charging will be determined according to the user-specified time.

[0101] It's understandable that users can specify their travel time, and to ensure a good user experience, charging should be controlled based on this specified time. However, if the user-specified time is many days in advance, it will reduce the reliability of the power battery charging.

[0102] Therefore, in a specific embodiment, it is first determined whether the second duration from the initial charging start time to the user-specified time is less than a preset duration. In one optional embodiment, the preset duration can be set to no more than 24 hours, thereby ensuring that intermittent charging is completed within the same day. If the second duration is less than the preset duration, it indicates that the user needs to use the vehicle again within 24 hours. In order to ensure that the user can use the vehicle normally and to ensure the reliability of power battery charging, intermittent charging can be adopted.

[0103] At this point, after controlling the power battery to charge for a period of time, that is, charging stops once the SOC threshold is reached, and the time for the second charging start is calculated based on the user-specified time. The calculation is performed under the condition that the time to reach the full charge SOC value does not exceed the user-specified time. In other words, it ensures that reaching the full charge SOC value is close to the user-specified travel time.

[0104] If the user's travel time is the time specified by the user, and the second duration is not less than the preset duration, then the following steps will be executed:

[0105] Determine whether the current SOC value of the power battery is less than a preset value; where the preset value is less than the SOC threshold.

[0106] If the value is less than the preset value, execute the steps of controlling the power battery to charge from the initial charging time to the SOC threshold and then stopping charging, and subsequent steps.

[0107] If the current SOC value is not less than the preset value, wait for the current SOC value to decrease to less than the preset value, and then execute the steps of controlling the power battery to charge from the initial charging time to the SOC threshold and then stopping charging, as well as subsequent steps.

[0108] In another optional embodiment, if the second duration is not less than a preset duration,

[0109] This indicates that the user-specified travel time is too far in the time the charging gun is plugged in; that is, the user-specified time may be many days in the future. For example, when the preset duration is 24 hours, this indicates that the user's travel time is 24 hours after the charging gun is plugged in.

[0110] To ensure the reliability of battery charging, in one optional embodiment, it is first determined whether the current SOC value of the battery is less than a preset value, where the preset value is greater than zero and less than the SOC threshold. The preset value is the minimum limit for battery charging; that is, when the battery's SOC value is less than the preset value, intermittent charging must be performed immediately.

[0111] If the current SOC value is not lower than the preset value, charging is delayed to ensure improved battery charging reliability. Charging will only begin intermittently after the current SOC value drops below the preset value. An example will be provided below for clarity.

[0112] For example, if the current SOC value of the power battery is 50% and the preset value is 30%, then charging can be delayed as long as the current SOC value is not less than the preset value. Specifically, after the vehicle is plugged into the charging gun, charging control is not performed until the current SOC value drops to less than 30%, at which point intermittent charging is performed according to the user's specified travel time.

[0113] If the current SOC value of the power battery is 20%, to avoid leaving the power battery idle until the user is about to travel before recharging, which could result in the power battery being completely discharged and thus affecting its lifespan, the power battery should be intermittently charged immediately when the current SOC value is lower than a preset value.

[0114] In one optional embodiment, if the user's travel time is the time specified by the user, and the second duration is not less than a preset duration, considering that the discharge rate is relatively slow when the vehicle is stationary, intermittent charging control can also be performed on the power battery immediately after the charging gun is plugged in. Specifically, after charging to the SOC threshold, the battery is left to stand still until it is close to the user's specified travel time, and then the second stage of charging is performed to ensure that the battery is fully charged close to the user's specified travel time.

[0115] In one optional embodiment, the intermittent charging mode provided in this application (which can also be called the healthy charging mode, and this application does not limit this) can be activated via a mobile phone or the vehicle's infotainment system. Upon activation, a pop-up window will display: "Healthy charging mode is now enabled. To slow down battery aging, the vehicle will learn your charging patterns each time and temporarily delay charging to above 90% until you fully charge it before 9:00 AM tomorrow." Further, a pop-up window will appear, allowing the user to manually enter their travel time. Alternatively, the user can skip the option to manually enter the time and choose to use the predicted travel time pushed from the cloud. Of course, if neither option is selected, the cloud will send the predicted user travel time to the vehicle.

[0116] In a specific embodiment, if the predicted user travel time sent by the cloud is delayed and the vehicle does not receive the user travel time within a preset time, it will first charge according to the alternative charging strategy. If the user travel time is obtained midway, the charging mode will be switched to the healthy charging mode according to the alternative charging strategy.

[0117] Understandably, when calculating the second charging start time, the power battery can be charged from that time to its full SOC value, just in time for the user's travel. However, considering potential errors in the charging time calculation, the power battery may not have reached its full SOC value by the time the user travels, thus reducing the charging reliability of the power battery. Therefore, in one optional embodiment, a safe redundancy time can be set to ensure that the power battery is fully charged before the user's travel time.

[0118] Specifically, the charging time from the second charging start point to full charge SOC value does not exceed the user's travel time, and there is a specified remaining time before the user's travel time, such as... Figure 2 As shown, the specified duration is the time between point B4 and point B5. Similarly, in the alternative charging strategy, the specified duration also applies when the battery reaches its full SOC value. For example, the specified duration could be 1 hour, meaning that when the battery reaches its full SOC value, there is still 1 hour before the user's travel time.

[0119] Based on the above embodiments, in order to further improve the charging reliability of the power battery, reduce the capacity decay of the power battery, and increase the cycle life of the power battery, in an optional embodiment, when controlling the power battery to continue charging to the full charge SOC value, trickle charging can be used to charge the SOC to the full charge SOC value.

[0120] Trickle charging, also known as float charging, is a low-current charging method used to maintain a fully charged state of the battery as it approaches full charge, while avoiding overcharging. Once the battery has charged to a certain level, the charger automatically reduces the charging current, charging at a lower power. This method helps extend battery life because it reduces the stress on the battery's internal structure caused by high voltage and high current.

[0121] It is worth noting that when using trickle charging, the time required to charge to the full SOC value from the SOC threshold needs to be calculated and determined based on the trickle charging speed.

[0122] In an optional embodiment, the charging control method for a power battery provided in this application further includes:

[0123] Obtain historical charging data of the power battery within a specified period; wherein, the historical charging data includes at least the energy decay data of the power battery during the period when charging was stopped;

[0124] The SOC threshold is adjusted based on historical charging data.

[0125] It is understandable that in the power battery charging control provided in this application, the SOC threshold at which the first stage of charging stops is crucial to the performance of the power battery, such as its lifespan. Different SOC values ​​corresponding to the first stage of charging stop, i.e., different SOC thresholds, result in different energy decay rates. Furthermore, different vehicles have different corresponding SOC thresholds.

[0126] To adapt to different vehicle models, expand the application scope, and obtain the optimal SOC threshold for the vehicle, in one optional embodiment, historical charging data of the power battery within a specified period can be acquired. This historical charging data includes, at least, data on the energy decay of the power battery during periods when charging was stopped.

[0127] Furthermore, historical charging data within a specified period is analyzed to determine the energy degradation of the power battery under different SOC threshold conditions, or to determine the performance of the power battery based on other data such as voltage, current, and power.

[0128] After obtaining the analysis results, the SOC threshold is optimized and adjusted based on the analysis results. In this way, the optimal SOC threshold can be obtained through continuous use, thereby further improving the charging reliability of the power battery.

[0129] As an optional embodiment, before obtaining the initial charging time of the vehicle's power battery, the SOC threshold, and the user's travel time, the following steps are also included:

[0130] If a scheduled charging instruction is received, the start time of the scheduled charging instruction will be used as the first start time; then proceed to the steps of obtaining the first start time of the vehicle's power battery, the SOC threshold, and the user's travel time, and execute the subsequent steps.

[0131] In a specific embodiment, the charging control method for the power battery provided in this application supports users to schedule charging. Specifically, users can input a scheduled charging command through a vehicle display screen or other means. In this case, the start time of the scheduled charging command is taken as the first start time. After determining the first start time, the process proceeds to the step of determining the first duration required to charge to full SOC value from the first start time, and then executes subsequent steps.

[0132] Therefore, the power battery charging control method provided in this application embodiment can combine scheduled charging and intermittent charging to meet the diverse charging needs of users.

[0133] In the above embodiments, the charging control method for the power battery has been described in detail. This application also provides an embodiment of the charging control device for the power battery.

[0134] Figure 6 This is a schematic diagram of the structure of a charging control device for a power battery provided in an embodiment of this application, as shown below. Figure 6 As shown, the device includes:

[0135] The acquisition module 60 is used to acquire the first charging time of the vehicle's power battery, the SOC threshold, and the user's travel time.

[0136] The first charging control module 61 is used to control the power battery to charge to the SOC threshold and stop charging when the first charging time is less than the second charging time; and to determine the second charging time of the power battery according to the user's travel time.

[0137] The secondary charging control module 62 is used to control the power battery to continue charging to full SOC value from the second charging start time; wherein, the first duration is the duration required to charge to full SOC value from the first charging start time, and the second duration is the duration between the first charging start time and the user's travel time.

[0138] Furthermore, the charging control device for the power battery provided in this application embodiment also includes:

[0139] The second charging start time determination module is used to determine whether the predicted travel time is within the preset travel time range when the user's travel time is the predicted time. If it is within the preset travel time range, the second charging start time is determined based on the predicted time. If it is not within the preset travel time range, the following steps are performed: determining whether the first duration is less than the third duration; the third duration is the duration between the first charging start time and the specified time, and the specified time is less than the minimum time within the preset travel time range; if it is less than the third duration, the second charging start time is determined based on the specified time.

[0140] The second module for determining the second charging start time is used to determine whether the second duration is less than a preset duration when the user's travel time is the user-specified time; if it is less than the preset duration, the second charging start time is determined according to the user-specified time; if it is not less than the preset duration, the following steps are executed: determining whether the current SOC value of the power battery is less than a preset value; wherein, the preset value is less than the SOC threshold; if it is less than the preset value, the steps of controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging and subsequent steps are executed; if it is not less than the preset value, the steps of controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging and subsequent steps are executed after the current SOC value decreases to less than the preset value.

[0141] The secondary charging control module 62 is also used to control the power battery to trickle charge to full SOC value from the start of the secondary charging.

[0142] The historical charging data acquisition module is used to acquire historical charging data of the power battery within a specified period; wherein, the historical charging data includes at least the energy decay data of the power battery during the time when charging was stopped.

[0143] The SOC threshold adjustment module is used to adjust the SOC threshold based on historical charging data.

[0144] The initial charging start time determination module is used to determine the initial charging start time of the scheduled charging instruction as the initial charging start time when a scheduled charging instruction is received; and proceed to the step of obtaining the SOC threshold of the vehicle's power battery at the initial charging start time and the user's travel time, and then execute the subsequent steps.

[0145] Figure 7 This is a schematic diagram of the structure of a charging control device for a power battery according to another embodiment of this application, as shown below. Figure 7 As shown, the charging control device for the power battery includes: a memory 70 for storing computer programs;

[0146] The processor 71 is used to execute a computer program to implement the steps of the power battery charging control method mentioned in the above embodiments.

[0147] The charging control device for the power battery provided in this embodiment may include, but is not limited to, vehicle controllers, domain controllers, etc.

[0148] The processor 71 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 71 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 71 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 71 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 71 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0149] The memory 70 may include one or more computer-readable storage media, which may be non-transitory. The memory 70 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 70 is used to store at least the following computer program 701, which, after being loaded and executed by the processor 71, is capable of implementing the relevant steps of the power battery charging control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 70 may also include an operating system 702 and data 703, and the storage method may be temporary storage or permanent storage. The operating system 702 may include Windows, Unix, Linux, etc. The data 703 may include, but is not limited to, relevant data involved in the power battery charging control method.

[0150] In some embodiments, the charging control device for the power battery may further include a display screen 72, an input / output interface 73, a communication interface 74, a power supply 75, and a communication bus 76.

[0151] Those skilled in the art will understand that Figure 7The structure shown does not constitute a limitation on the charging control device for the power battery and may include more or fewer components than shown.

[0152] The power battery charging control device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the power battery charging control method in the above embodiments.

[0153] It should be noted that although the operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or requiring all illustrated operations to be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

Claims

1. A charging control method for a power battery, characterized in that, The method includes: Obtain the vehicle's first charging start time, SOC threshold, and user travel time; When the first duration is less than the second duration, the power battery is controlled to charge from the first charging start time to the SOC threshold and then charging is stopped; and the second charging start time of the power battery is determined according to the user's travel time. The power battery is controlled to continue charging from the second charging start time to the full charge SOC value; wherein, the first duration is the duration required to charge from the first charging start time to the full charge SOC value, and the second duration is the duration between the first charging start time and the user's travel time; The control of the power battery to continue charging to full SOC value from the second charging start time includes: The power battery is controlled to trickle charge to the full charge SOC value starting from the second charging start time.

2. The charging control method for a power battery as described in claim 1, characterized in that, Before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included: When the user's travel time is the predicted time, determine whether the predicted time is within the preset travel time range; If the second charging start time is determined based on the predicted time within the preset travel time range; If the travel time is outside the preset travel time range, proceed with the following steps: Determine whether the first duration is less than the third duration; the third duration is the duration between the first charging start time and the specified time, and the specified time is less than the minimum time of the preset travel time range; If it is less than the third duration, the second charging start time is determined according to the specified time.

3. The charging control method for a power battery as described in claim 1, characterized in that, Before stopping charging the power battery after it has been charged to the SOC threshold from the initial charging start time, the following steps are included: When the user's travel time is the time specified by the user, determine whether the second duration is less than the preset duration; If the time is less than the preset duration, the second charging start time is determined according to the user-specified time. If the duration is not less than the preset time, perform the following steps: Determine whether the current SOC value of the power battery is less than a preset value; wherein the preset value is less than the SOC threshold. If the value is less than the preset value, execute the step of controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, and the subsequent steps. If the current SOC value is not less than the preset value, wait for the current SOC value to decrease to less than the preset value, and then execute the step of controlling the power battery to charge from the initial charging time to the SOC threshold and then stopping charging, as well as subsequent steps.

4. The charging control method for a power battery as described in claim 1, characterized in that, The charging time from the second charging start time to the full charge SOC value does not exceed the user's travel time, and there is a specified time remaining until the user's travel time.

5. The charging control method for a power battery as described in claim 1, characterized in that, The method further includes: Obtain historical charging data of the power battery within a specified period; wherein the historical charging data includes at least the energy decay data of the power battery during the period when charging was stopped; The SOC threshold is adjusted based on the historical charging data.

6. The charging control method for a power battery as described in claim 1, characterized in that, Before obtaining the initial charging time of the vehicle's power battery, the SOC threshold, and the user's travel time, the following is also included: If a scheduled charging instruction is received, the start time of the scheduled charging instruction is taken as the first start time; and the process proceeds to the step of obtaining the first start time of the vehicle's power battery, the SOC threshold, and the user's travel time, and then executes the subsequent steps.

7. A charging control device for a power battery, characterized in that, The device includes: The acquisition module is used to acquire the first charging time of the vehicle's power battery, the SOC threshold, and the user's travel time; The initial charging control module is used to control the power battery to charge from the initial charging start time to the SOC threshold and then stop charging when the first duration is less than the second duration; and to determine the second charging start time of the power battery based on the user's travel time. A secondary charging control module is used to control the power battery to continue charging to full charge SOC value from the secondary charging start time; wherein, the first duration is the duration required to charge to full charge SOC value from the first charging start time, and the second duration is the duration between the first charging start time and the user's travel time; The control of the power battery to continue charging to full SOC value from the second charging start time includes: The power battery is controlled to trickle charge to the full charge SOC value starting from the second charging start time.

8. A charging control device for a power battery, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the charging control method for the power battery according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the charging control method for the power battery according to any one of claims 1 to 6.

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