Charging control method and device of power battery and medium

Abstract

The invention discloses a charging control method and device for a power battery and a medium. The method comprises the steps that the first charging starting moment, the SOC threshold value and the user travel time of the vehicle power battery are obtained; when the first time length is smaller than the second time length, the power battery is controlled to be charged from the first charging starting moment to the SOC threshold value and then is stopped from being charged; determining a secondary charging starting moment of the power battery according to the travel time of the user; the power battery is controlled to be continuously charged to the full-charge SOC value from the secondary charging starting moment; wherein the first duration is the duration required for charging from the first charging starting moment to the full charging SOC value, and the second duration is the duration from the first charging starting moment to the user travel time. Therefore, in combination with the travel time of the user, charging is stopped after the SOC threshold value is reached through charging, standing is carried out till the secondary charging starting moment is reached, and charging is carried out again till the power battery is fully charged, so that the time when the power battery is fully charged is closer to the travel time of the user, and the duration of the power battery in the fully-charged SOC is shortened.

Description

Technical Field

[0001] The present 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 Art

[0002] With the continuous development of new energy technologies, electric vehicles are popular among users due to their environmental protection, low noise and energy saving. As the core component of electric vehicles, power batteries provide the main power source for electric vehicles. Therefore, the performance and quality of power batteries are directly related to the vehicle's range, safety and service life, and are a crucial research direction.

[0003] When charging the power battery, users often fail to unplug the charging gun and power off the power in time after the power battery is fully charged, causing the power battery to be in a high state of charge (SOC) for a long time, that is, it is close to or fully charged for a long time. This increases the pressure and stress inside the power battery, and makes the chemical substances active, which accelerates the aging of the power battery and affects the life of the power battery, that is, it causes the power battery capacity to decline and the performance to deteriorate, affecting the performance of the entire vehicle.

[0004] Therefore, how to prevent the power battery from being in a high SOC state for a long time, resulting in power battery capacity decay and performance degradation, thereby ensuring the service life of the power battery and improving the performance of the entire vehicle, is an urgent problem to be solved by technical personnel in this field. Summary of the invention

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

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

[0007] When the first time length is less than the second time length, controlling the power battery to charge from the first charging start time to the SOC threshold and then stop charging; and determining the second charging start time of the power battery according to the user's travel time;

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

[0009] Optionally, before controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, the method includes:

[0010] When the user travel time is a predicted time, determining whether the predicted time is within a preset travel time range;

[0011] If within the preset travel time range, determine the second charging start time according to the predicted time;

[0012] If it is not within the preset travel time range, perform the following steps:

[0013] Determine whether the first duration is less than a third duration; the third duration is the duration between the first charging start time and a 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 time period, the second charging start time is determined according to the designated time.

[0015] Optionally, before controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, the method includes:

[0016] When the user travel time is the user specified time, determining whether the second duration is less than a preset duration;

[0017] If it is less than the preset time, determining the second charging start time according to the user specified time;

[0018] If it 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 SOC value is less than the preset value, the step 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 performed;

[0021] If it 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 first charging start time to the SOC threshold and then stop charging and subsequent steps.

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

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

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

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

[0026] Acquire historical charging data of the power battery within a specified period; wherein the historical charging data at least includes power energy attenuation data of the power battery during the time when charging is stopped;

[0027] The SOC threshold is adjusted according to the historical charging data.

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

[0029] If a scheduled charging instruction is received, the charging start time of the scheduled charging instruction is used as the first charging start time; and the step of obtaining the first charging start time, SOC threshold and user travel time of the vehicle power battery is entered, and subsequent steps are executed.

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

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

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

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

[0034] Another aspect of the present application provides a charging control device for a power battery, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the program, the steps of the charging control method for the power battery are implemented.

[0035] Another aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the steps of the power battery charging control method are implemented.

[0036] The present application provides a power battery charging control method, device and medium, which have the following beneficial effects: by combining the user's travel time, charging is stopped after the power battery is charged to 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 the full SOC is reached, so that the power battery reaches the full SOC closer to the user's travel time, reducing the time the power battery is at the full SOC, and extending the service life of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a flow chart of a charging control method for a power battery provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the principle of a power battery charging control method provided in an embodiment of the present application;

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

[0040] Figure 4 A schematic flow chart of a charging control method for a power battery provided in another embodiment of the present application;

[0041] Figure 5 A schematic diagram of data interaction between a vehicle and the cloud provided in an embodiment of the present application;

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

[0043] Figure 7 A schematic structural diagram of a charging control device for a power battery provided in another embodiment of the present application.

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

[0045] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

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

[0047] Figure 1 A schematic diagram of a charging control method for a power battery provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes:

[0048] S10: Obtaining the first charging time of the vehicle 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 determines that the charging gun is connected. At this time, the first charging time and SOC threshold of the vehicle power battery are obtained, and at the same time, the user's travel time is obtained. It can be understood that the first charging time refers to the first charging time of the power battery after the charging gun is connected.

[0050] Among them, the SOC threshold is used as the stop condition for the first charging of the power battery. The user travel time can be the time specified by the user himself, or it can be the time predicted by obtaining the historical travel data of the vehicle 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 executed by a vehicle controller or a domain controller, and this application does not limit this. In fact, in practical applications, the charging control method provided in this application can be applied to charging control in other fields.

[0052] In addition, it should be noted that the vehicles to which the method provided in the present application can be applied may include but are not limited to sedans, sport utility vehicles (SUV), multi-purpose vehicles (MPV), off-road vehicles, pickup trucks or other power-driven non-track-borne vehicles, and the provided vehicles may be vehicles that can provide electrical energy through power batteries.

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

[0054] Furthermore, the first time required to charge from the first charging start time to the full charge SOC value is determined, that is, the time required for the power battery to be continuously charged until it is fully charged from the time the vehicle is connected to the charger is determined, which is recorded as the first time. At the same time, the second time between the first charging start time and the user's travel time is determined, that is, the time from the time the power battery is connected to the charger to the next time the user travels, which is recorded as the second time.

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

[0056] At this time, in order to avoid the power battery being fully charged to the SOC value and then being left idle for a long time before the user uses the vehicle for travel, that is, to avoid the power battery being in a fully charged state for a long time. In an optional embodiment, after determining that the first time period is less than the second time period, the power battery is first controlled to be charged to the SOC threshold from the first charging time and then stopped charging, that is, the power battery is controlled to be disconnected from the charging connection after being charged to the SOC threshold.

[0057] The SOC threshold is less than the full charge SOC value. That is, the charging of the power battery is divided into two stages, and the charging is stopped and the battery is left standing for a period of time between the two stages. In addition, the sum of the charging time and the standing time of the two stages is less than the second time.

[0058] Specifically, in the first stage, the power battery is charged until it reaches the SOC threshold, that is, the power battery is not fully charged in the first stage, and charging is stopped after the SOC threshold is reached. At the same time, the second charging time of the power battery is determined according to the user's travel time. That is, the time to start charging the power battery for the second time is determined according to the user's travel time.

[0059] Specifically, it is necessary to determine the target time required to charge from the SOC threshold to the full SOC value, and determine the second charging time in combination with the user's travel time and the target time. That is, determine the time node for starting charging in the second stage.

[0060] It is understandable that in order to fully charge the power battery and avoid the power battery being at the full charge SOC value for a long time, when determining the second start charging time, it is necessary to ensure that the third charging time from the second start charging time does not exceed the user's travel time. That is, it is ensured that when the power battery reaches the full charge SOC value, it is close to the user's travel time.

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

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

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

[0064] like Figure 2 As shown in the figure, in charging strategy 1, point A1 is the first charging time of the power battery, A2 is the time when the power battery reaches the full charge SOC value, and A3 is the user's travel time. Under charging strategy 1, the power battery starts to charge uninterruptedly from point A1, that is, it continues to charge until it reaches the full charge SOC value at point A2. At this time, the power battery is in a full charge SOC value state 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 the present application), point B1 is the first charging start time of the power battery, i.e., it is the same time as point A1 in charging strategy 1. Point B2 is when the power battery is charged to the SOC threshold, i.e., at this time, the SOC of the power battery is equal to the SOC threshold. Point B3 is the second charging start time, and point B4 is the time when the power battery reaches the fully charged SOC value. Point B5 is the user's travel time, i.e., it is the same time as point A3 in charging strategy 1.

[0066] In charging strategy 2, the power battery is charged in the first stage, that is, it is charged from the first charging point B1 to the SOC threshold point B2, and then stops charging after point B2 and rests for a period of time from B2 to B3. Then, the second stage of charging starts from the second charging point B3 until it reaches the full charge SOC value point B4.

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

[0068] Figure 3 A schematic diagram of another power battery charging control method provided in an embodiment of the present application is provided below. In order to make the technical solution of the present application more clear to those skilled in the art, Figure 3 Give an example.

[0069] like Figure 3 As shown, for example, in an optional embodiment, the user's travel time is 8:00 in the morning, and the vehicle is connected to the charging gun at 20:00 at night, that is, the first charging time is 20:00 at night, and the remaining SOC value of the vehicle is 30%. The SOC threshold of the vehicle is 90%, and the time required to charge from the SOC threshold to the full charge SOC value (i.e., 100%) is 2 hours.

[0070] In a specific charging embodiment, the vehicle starts charging at 20:00 at night, and after charging continuously for 6 hours, the SOC reaches the SOC threshold at 2:00 in the morning, that is, the SOC is charged from 30% to 90%. At this time, in order to reduce the duration of the power battery being fully charged, the power battery is controlled to stop charging.

[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 a.m., that is, the vehicle stops charging at 2:00 a.m. and stands still until 5:00 a.m., and enters the second stage charging of the power battery at 5:00 a.m. After charging for 2 hours, the SOC is charged from 90% to 100% at 7:00 a.m.

[0072] Therefore, the user uses the car at 8:00 in the morning, and the vehicle completes charging at 7:00 in the morning, that is, the vehicle SOC reaches 100% at 7:00 in the morning, that is, the power battery is fully charged for 1 hour, which is close to the user's travel time, reducing the power battery capacity loss and ensuring the power battery service life.

[0073] Therefore, the charging control method of the power battery provided in the embodiment of the present application, by combining the user's travel time, stops charging after the power battery is charged to the SOC threshold, leaves it to rest for a period of time until the second charging time, and then charges it again until the full SOC is reached. This allows the power battery to reach the full SOC closer to the user's travel time, reduces the time the power battery is at the full SOC, and extends the service life of the power battery.

[0074] Figure 4A schematic flow chart of a charging control method for a power battery provided in another embodiment of the present application is provided as an optional embodiment. Figure 4 As shown, before controlling the power battery to charge from the first charging moment to the SOC threshold and then stop charging, it includes:

[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 an optional embodiment, the user's travel time may be set by the user, that is, it may be a time specified by the user. In another optional embodiment, the user's travel time may also be a predicted time predicted based on the user's historical travel data.

[0077] Figure 5 A schematic diagram of data interaction between a vehicle and a cloud provided in an embodiment of the present application, in an optional embodiment, as Figure 5 As shown, when the vehicle side 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 that can perform the intermittent charging control method of the present application, wherein the intermittent charging method refers to the charging method provided in the present application that divides the power battery charging into two stages, and stops charging for a period of time between the two stages.

[0078] After the cloud receives the intermittent charging method on the vehicle side, it sends the user's historical travel-related data to the vehicle side through TCAM. The historical travel-related data may include but is not limited to user portraits, travel date attributes, travel time attributes, travel weather, historical travel habits, and the time the user drew his gun before traveling. The travel date attribute refers to label attributes such as whether the travel date is a weekday or a holiday, and the travel time attribute refers to label attributes such as whether the travel time is during the morning rush hour. In this way, the prediction accuracy of the user's travel time is improved based on multi-dimensional labels.

[0079] In an optional embodiment, when predicting the user's travel time, the prediction can be made through a time series regression model. It is worth noting that in a specific embodiment, the prediction of the user's travel time can be as follows: Figure 5 As shown, the cloud completes the process, and after obtaining the predicted user travel time, the predicted time is sent to the vehicle side so that the vehicle can plan the charging of the power battery. Of course, in another optional embodiment, the user's historical travel related data can also be sent to the vehicle side. Since the vehicle side completes the prediction, this application does not limit this.

[0080] Furthermore, after the vehicle side obtains the user's travel time, it determines whether the user's travel time is within the preset travel time range. It is understandable that the predicted user travel time may be inaccurate, or the predicted travel time may be many days later, and charging the power battery according to the inaccurate predicted time will inevitably affect the reliability of power battery charging.

[0081] Therefore, in order to solve this technical problem, in a specific embodiment, when the user's travel time is a 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 currently predicted user travel time is highly reliable, that is, the confidence is high. At this time, the power battery can be charged by the intermittent charging method provided in the present application, and step S41 is executed.

[0083] However, if the predicted time is not within the preset time range, it indicates that the reliability of the currently predicted user travel time is low, that is, the confidence is low. At this time, in order to ensure the reliability of power battery charging, Figure 4 As shown, proceed to step S42.

[0084] S41: Determine the second charging start time according to the predicted time;

[0085] When the predicted time is reliable, the secondary charging time needs to be determined according to the user's travel time, so as to ensure that the power battery reaches the full charge SOC value close to the user's travel time. Specifically, when calculating the secondary charging time, the calculation is based on the principle that the time from the secondary charging time to the full charge SOC value does not exceed the predicted time.

[0086] S42: Determine whether the first duration is less than a third duration; wherein 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, execute step S43;

[0087] S43: Determine the time for starting the secondary charging according to the designated time.

[0088] In another optional embodiment, if the predicted time is unreliable, the battery can be charged through an alternative solution, which can prevent the power battery from being in a fully charged state for a long time while ensuring the reliability of the power battery charging.

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

[0090] The scheme of charging according to the 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 an optional embodiment, if the first time duration is less than the third time duration between the first charging start time and the specified time, it indicates that the power battery can be charged by the intermittent charging method provided in the present application before the specified time. At this time, the second charging start time of the power battery is calculated according to the specified time.

[0092] When calculating the secondary charging start time based on the specified time, it is necessary to ensure that the power battery reaches the full charge SOC value close to the specified time. That is, charging from the secondary charging start time to the full charge SOC value does 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 charged continuously from the first charging moment, it cannot reach the full charge SOC value before the specified moment, and intermittent charging cannot be performed before the specified moment. At this time, the power battery is controlled to charge to the full charge SOC value from the current moment, that is, the power battery is charged continuously from the first charging moment until it reaches the full charge SOC value or reaches the user's travel time.

[0094] It is worth noting that regardless of whether the predicted user travel time is reliable, that is, whether the confidence level meets expectations, as long as the first duration is less than the second duration, the intermittent charging method provided in this application can be used to charge the power battery. The difference is that when the confidence level of the predicted time is high, the secondary charging start time can be calculated based on the predicted time, and when the confidence level of the predicted time is low, the secondary charging start time needs to be calculated based on the specified time. In other words, under the condition that the first duration is less than the second duration, regardless of whether the predicted time is reliable, the intermittent charging method can be used to charge the power battery, except that the time node for starting charging at the second node is different.

[0095] Of course, if the first time length is not less than the second time length, it indicates that intermittent charging cannot be performed before the user's travel time, that is, the time length before the user's travel time is not enough to complete an intermittent charging. At this time, the power battery is controlled to charge continuously from the first charging start time until the full charge SOC value is reached or the user's travel time is reached.

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

[0097] Therefore, the power battery charging control method provided in the embodiment of the present 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 of the predicted user travel time is low, the alternative charging strategy is used to avoid the power battery charging time being in a full charging state and ensure charging reliability.

[0098] In an optional embodiment, before controlling the power battery to charge to the SOC threshold from the first charging start time and then stop charging, it includes:

[0099] When the user travel time is the user-specified time, determining whether the second duration is less than the preset duration;

[0100] If it is less than the preset time, the second charging time is determined according to the time specified by the user;

[0101] It is understandable that the user's travel time can be a user-specified time. In order to ensure user experience, charging control should be based on the user-specified time. However, if the user-specified time is many days later, the reliability of power battery charging will be reduced.

[0102] Therefore, in a specific embodiment, it is first determined whether the second time period from the first charging start time to the user-specified time period is less than the preset time period, wherein, in an optional embodiment, the preset time period can be set to no more than 24 hours, thereby ensuring that intermittent charging is completed within the same day. If the second time period is less than the preset time period, 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 used.

[0103] At this time, the power battery is controlled to charge for a period of time, that is, charging stops after reaching the SOC threshold, and the second charging start time is calculated according to the user-specified time. When calculating, the calculation is performed under the condition that the full charge SOC value does not exceed the user-specified time. That is, it is guaranteed that the full charge SOC value is close to the travel time specified by the user.

[0104] If the user travel time is the time specified by the user and the second duration is not less than the preset duration, perform the following steps:

[0105] 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;

[0106] If it is less than the preset value, the step 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;

[0107] If it 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 first charging start time to the SOC threshold and then stop charging and subsequent steps.

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

[0109] This indicates that the travel time specified by the user is too far from the time of plugging in the charging gun, that is, the user-specified time may be many days later. For example, when the preset time is 24 hours, it indicates that the user's travel time is 24 hours after the charging gun is plugged in.

[0110] At this time, in order to ensure the charging reliability of the power battery, in an optional embodiment, it is first determined whether the current SOC value of the power battery is less than a preset value, wherein the preset value is greater than zero and less than the SOC threshold. The preset value is the lowest limit value for charging the power battery, that is, when the power battery is less than the preset value, the power battery must be intermittently charged immediately.

[0111] If the current SOC value is not less than the preset value, in order to ensure the reliability of power battery charging, charging is delayed. Wait until the current SOC value drops below the preset value before intermittent charging. For ease of understanding, an example is given below.

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

[0113] If the current SOC value of the power battery is 20%, in order to avoid the power battery being completely discharged until the user is about to travel and then charged, thus affecting the service life of the power battery, when the current SOC value is less than the preset value, the power battery is immediately intermittently charged.

[0114] In an optional embodiment, if the user's travel time is a user-specified time, and the second duration is not less than the preset duration, considering that the discharge speed is slow when the vehicle is stationary, the power battery can also be intermittently charged immediately after the charging gun is inserted. Specifically, after charging to the SOC threshold, the vehicle is left stationary until it is close to the user's specified travel time, and then the second stage of charging is performed to ensure that the vehicle is fully charged close to the user's specified travel time.

[0115] In an optional embodiment, the intermittent charging mode (also known as the healthy charging mode, which is not limited in this application) provided in the present application is turned on. It can be turned on through the mobile phone or the vehicle terminal. After turning it on, a pop-up window prompts: "The healthy charging mode is turned on. In order to slow down battery aging, the vehicle will learn your charging mode each time and temporarily suspend charging to more than 90% until you use the car for a full charge before 9:00 tomorrow morning." Furthermore, the pop-up window jumps, and the user can manually enter the user's travel time according to travel willingness. If the user skips the voluntary time input option, he can also choose to follow the predicted travel time pushed by 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 there is a delay in the predicted user travel time sent from the cloud, and the vehicle does not receive the user travel time within a preset time, the vehicle will first charge according to the alternative charging strategy. When the user travel time is obtained in the middle of the charge, the charging mode will be switched to the healthy charging mode according to the alternative charging strategy.

[0117] It is understandable that when calculating the secondary charging start time, the power battery can be charged from the secondary charging start time to the full charge SOC value just before the user's travel time, but considering that there may be errors in the calculation of the charging time, it may happen that the power battery has not reached the full charge SOC value when the user travels, thereby reducing the charging reliability of the power battery. Therefore, in an optional embodiment, a safe redundant time can be set to ensure that the power battery is fully charged before the user travels.

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

[0119] On the basis of the above embodiments, in order to further improve the charging reliability of the power battery, reduce the capacity attenuation 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, the SOC can be charged to the full charge SOC value by trickle charging.

[0120] Among them, trickle charging, also known as floating charging, is a low-current charging method used to maintain the battery's full charge state after it is nearly full while avoiding overcharging. After the battery is charged to a certain level, the charger will automatically reduce the charging current and charge at a lower power. This method helps to extend battery life because it reduces the stress of high voltage and high current on the internal structure of the battery.

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

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

[0123] Obtaining historical charging data of the power battery within a specified period; wherein the historical charging data at least includes power energy attenuation data of the power battery during the time when charging is 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 for stopping charging in the first stage is crucial to the performance of the power battery, such as the service life. Different SOC values ​​corresponding to stopping charging in the first stage, that is, different SOC thresholds have different electric energy decay rates. And different vehicles have different corresponding SOC thresholds.

[0126] In order to adapt to different vehicle models, expand the scope of application, and obtain the optimal SOC threshold of the vehicle, in an optional embodiment, historical charging data of the power battery within a specified period can be obtained, wherein the historical charging data at least includes the power energy attenuation data of the power battery during the time when charging is stopped.

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

[0128] After obtaining the analysis results, the SOC threshold is optimized and adjusted according to the analysis results, so that the best SOC threshold can be obtained during continuous use, thereby further improving the charging reliability of the power battery.

[0129] As an optional embodiment, before obtaining the first charging time of the vehicle power battery, the SOC threshold and the user's travel time, it also includes:

[0130] If a scheduled charging instruction is received, the charging start time of the scheduled charging instruction is used as the first charging start time; and the step of obtaining the first charging start time of the vehicle power battery, the SOC threshold and the user's travel time is entered, and subsequent steps are executed.

[0131] In a specific embodiment, the power battery charging control method provided in the present application supports users to schedule charging. Specifically, the user can input a scheduled charging instruction through a vehicle display screen, etc. At this time, the charging start time of the scheduled charging instruction is used as the first charging start time. After determining the first charging start time, the step of determining the first time required for charging from the first charging start time to the full charge SOC value is entered, and subsequent steps are executed.

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

[0133] In the above embodiments, the charging control method of the power battery is described in detail. The present application also provides a corresponding embodiment of a charging control device for a power battery.

[0134] Figure 6 A schematic diagram of a charging control device for a power battery provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the device comprises:

[0135] An acquisition module 60 is used to acquire the first charging time of the vehicle 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 from the first charging start time to the SOC threshold and then stop charging when the first time length is less than the second time length; and determine the second charging start 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 from the second charging start time to the full charge SOC value; wherein the first time length is the time length required to charge from the first charging start time to the full charge SOC value, and the second time length is the time length between the first charging start time and the user's travel time.

[0138] In addition, the power battery charging control device provided in the embodiment of the present application also includes:

[0139] The first module for determining the second charging start time is used to determine whether the predicted time is within the preset travel time range when the user travel time is the predicted time; if it is within the preset travel time range, determine the second charging start time according to the predicted time; if it is not within the preset travel time range, perform the following steps: determine whether the first time length is less than the third time length; the third time length is the time length 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 time length, determine the second charging start time according to the specified time.

[0140] The second determination module for the second charging starting time is used to determine whether the second time duration is less than the preset time duration when the user travel time is the user-specified time; if it is less than the preset time duration, determine the second charging starting time according to the user-specified time; if it is not less than the preset time duration, execute the following steps: determine whether the current SOC value of the power battery is less than the preset value; wherein the preset value is less than the SOC threshold value; if it is less than the preset value, execute the step of controlling the power battery to stop charging after charging to the SOC threshold value from the first charging starting time and subsequent steps; if it 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 stop charging after charging to the SOC threshold value from the first charging starting time and subsequent steps.

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

[0142] A 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 at least includes the power energy attenuation data of the power battery during the time when charging is stopped;

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

[0144] The first charging start time determination module is used to, when receiving the scheduled charging instruction, use the charging start time of the scheduled charging instruction as the first charging start time; and enter the step of obtaining the SOC threshold of the first charging time of the vehicle power battery and the user's travel time, and execute subsequent steps.

[0145] Figure 7 This is a structural diagram of a charging control device for a power battery provided in another embodiment of the present application, such as Figure 7 As shown, the charging control device of the power battery includes: a memory 70 for storing a computer program;

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

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

[0148] Among them, the processor 71 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 71 can be implemented in at least one hardware form of a digital signal processor (Digital Signal Processor, referred to as DSP), a field programmable gate array (Field-Programmable Gate Array, referred to as FPGA), and a programmable logic array (Programmable Logic Array, referred to as PLA). The processor 71 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a central processing unit (Central Processing Unit, referred to as CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 71 may be integrated with a graphics processing unit (Graphics Processing Unit, referred to as GPU), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 71 may also include an artificial intelligence (Artificial Intelligence, referred to as AI) processor, which is used to process computing 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 a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In this embodiment, the memory 70 is at least used to store the following computer program 701, wherein, after the computer program is loaded and executed by the processor 71, it can implement the relevant steps of the power battery charging control method disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory 70 may also include an operating system 702 and data 703, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 702 may include Windows, Unix, Linux, etc. Data 703 may include but is not limited to relevant data involved in the power battery charging control method, etc.

[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 source 75 , and a communication bus 76 .

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

[0152] The power battery charging control device provided in the embodiment of the present application includes a memory and a processor. When the processor executes the program stored in the memory, the power battery charging control method in the above embodiment can be implemented.

[0153] It should be noted that, although the operations are depicted in a specific order in the accompanying drawings, this should not be understood as requiring these operations to be performed in the specific order shown or to be performed sequentially, or requiring all illustrated operations to be performed to achieve the desired results. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of various system modules and components in the above-described embodiments should not be understood 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 comprises: Obtain the first charging time of the vehicle's power battery, SOC threshold, and user travel time; When the first time length is less than the second time length, controlling the power battery to charge from the first charging start time to the SOC threshold and then stop charging; and determining the second charging start time of the power battery according to the user's travel time; Control the power battery to continue charging from the second charging start time to the full charge SOC value; wherein the first time length is the time length required to charge from the first charging start time to the full charge SOC value, and the second time length is the time length between the first charging start time and the user's travel time.

2. The power battery charging control method according to claim 1, characterized in that: Before controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, the method includes: When the user travel time is a predicted time, determining whether the predicted time is within a preset travel time range; If within the preset travel time range, determine the second charging start time according to the predicted time; If it is not within the preset travel time range, perform the following steps: Determine whether the first duration is less than a third duration; the third duration is the duration between the first charging start time and a 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 time period, the second charging start time is determined according to the designated time.

3. The power battery charging control method according to claim 1, characterized in that: Before controlling the power battery to charge from the first charging start time to the SOC threshold and then stopping charging, the method includes: When the user travel time is the user specified time, determining whether the second duration is less than a preset duration; If it is less than the preset time, determining the second charging start time according to the user specified time; If it 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 SOC value is less than the preset value, the step 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 performed; If it 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 first charging start time to the SOC threshold and then stop charging and subsequent steps.

4. The power battery charging control method according to claim 1, characterized in that: Charging 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 before the user's travel time.

5. The power battery charging control method according to claim 1, characterized in that: The controlling the power battery to continue charging to a full charge SOC value from the second charging start time includes: The power battery is controlled to be trickle charged to the full charge SOC value starting from the secondary charging start time.

6. The power battery charging control method according to claim 1, characterized in that: The method further comprises: Acquire historical charging data of the power battery within a specified period; wherein the historical charging data at least includes power energy attenuation data of the power battery during the time when charging is stopped; The SOC threshold is adjusted according to the historical charging data.

7. The power battery charging control method according to claim 1, characterized in that: Before obtaining the first charging time of the vehicle power battery, the SOC threshold and the user's travel time, it also includes: If a scheduled charging instruction is received, the charging start time of the scheduled charging instruction is used as the first charging start time; and the step of obtaining the first charging start time, SOC threshold and user travel time of the vehicle power battery is entered, and subsequent steps are executed.

8. A charging control device for a power battery, characterized in that: The device comprises: An acquisition module is used to obtain the first charging time of the vehicle power battery, the SOC threshold and the user's travel time; The first charging control module is used to control the power battery to charge from the first charging start time to the SOC threshold and then stop charging when the first time length is less than the second time length; and determine the second charging start time of the power battery according to the user's travel time; The secondary charging control module is used to control the power battery to continue charging from the second charging start time to the full charge SOC value; wherein, the first time length is the time length required to charge from the first charging start time to the full charge SOC value, and the second time length is the time length between the first charging start time and the user's travel time.

9. A charging control device for a power battery, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the program, the steps of the power battery charging control method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the power battery charging control method according to any one of claims 1 to 7 are implemented.

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