Charging control method and system of vehicle-mounted battery and vehicle

Abstract

The invention discloses a charging control method and system for a vehicle-mounted battery and a vehicle, and is characterized in that a current determined by a vehicle control unit based on a current environment temperature is an allowable charging current of the vehicle-mounted battery, so that a charging request voltage of the vehicle-mounted battery is adjusted according to an output current of a DC-DC converter in a working state and the allowable charging current. The charging current can be effectively prevented from exceeding the current limit value of the vehicle-mounted battery under the condition of considering the charging limitation of the current environment temperature on the vehicle-mounted battery, so that the overcurrent of the vehicle-mounted battery is avoided, and the influence on the service life of the vehicle-mounted battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a charging control method and system for a vehicle-mounted battery, and a vehicle. Background Art

[0002] The battery charging control system may include a vehicle control unit (VCU), a battery controller, a direct current (DC) converter (i.e., a DC-DC converter), and a power battery. During the process of charging the battery, the vehicle control unit may control the DC-DC converter based on the request voltage sent by the battery controller, so that the DC-DC converter controls the power battery to charge the battery.

[0003] In the related art, when the battery controller is offline, the request voltage sent by the vehicle controller to the DC-DC converter is usually a fixed value. However, this method may cause overcurrent in the battery, thereby damaging the performance and life of the battery. Summary of the invention

[0004] In view of the above problems, the present application provides a charging control method and system for a vehicle-mounted battery, and a vehicle. Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle-mounted battery, the charging request voltage of the vehicle-mounted battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. It can effectively prevent the charging current from exceeding the current limit of the vehicle-mounted battery while considering the charging restriction of the vehicle-mounted battery due to the current ambient temperature, thereby preventing the vehicle-mounted battery from overcurrent and reducing the impact on the life and performance of the vehicle-mounted battery.

[0005] On the one hand, a charging control method for a vehicle battery is provided, which is applied to a vehicle controller, wherein the vehicle battery is connected to the vehicle controller and supplies power to the vehicle controller, and the method comprises:

[0006] When the battery controller controlling the vehicle battery is offline, the current ambient temperature is obtained, and the allowable charging current of the vehicle battery is determined according to the current ambient temperature;

[0007] Determine an initial charge request voltage of the vehicle battery, and while controlling the DC-DC converter according to the initial charge request voltage, obtain the output current of the DC-DC converter in a working state, and adjust the charge request voltage of the vehicle battery according to the output current of the DC-DC converter in a working state and the allowed charging current, wherein the DC-DC converter is suitable for converting the voltage output by the vehicle power battery to charge the vehicle battery.

[0008] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. Taking into account the charging limit of the vehicle battery due to the current ambient temperature, it can effectively prevent the charging current from exceeding the current limit of the vehicle battery, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life and performance of the vehicle battery.

[0009] Optionally, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowed charging current, including:

[0010] Determine charging request voltage change information according to the output current of the DC-DC converter in the working state and the allowed charging current;

[0011] The charging request voltage of the vehicle battery is adjusted according to the charging request voltage change information.

[0012] In an embodiment of the present application, the vehicle controller adjusts the charging request voltage of the vehicle battery according to the charging request voltage change information, thereby reducing the impact of the charging request voltage change information, effectively preventing the charging current from exceeding the current limit of the battery, and further preventing the battery from overcurrent, thereby reducing the impact on the life of the vehicle battery.

[0013] Optionally, determining the charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter in the working state includes:

[0014] When the output current of the DC-DC converter in the working state is less than or equal to the first preset current threshold, determining a first voltage rising rate as charging request voltage change information;

[0015] When the output current of the DC-DC converter in the working state is greater than the first preset current threshold, if the output current of the DC-DC converter in the working state is less than or equal to the allowed charging current, a second voltage rise rate is determined as the charging request voltage change information, wherein the second voltage rise rate is less than the first voltage rise rate.

[0016] By detecting the relationship between the output current of the DC-DC converter in the working state and the first preset current threshold and the allowed charging current, different voltage rise rates are selected as the charging request voltage change information, which effectively prevents the charging current from exceeding the current limit of the battery, thereby preventing the battery from overcurrent. At the same time, the accuracy of the determined voltage rise rate is improved, and the precision of the on-board battery charging control is improved.

[0017] Optionally, when the output current of the DC-DC converter in the working state is greater than the first preset current threshold, the method further includes:

[0018] If the output current of the DC-DC converter in the working state is greater than the allowed charging current, the charging request voltage of the vehicle battery is kept unchanged.

[0019] That is, when the output current of the DC-DC converter is relatively large in the working state, the charging request voltage of the vehicle battery can be kept unchanged.

[0020] Optionally, before controlling the DC-DC converter according to the initial charging request voltage, the method further includes:

[0021] The initial supply voltage of the vehicle controller is obtained, and the charging target voltage of the vehicle battery is determined according to the initial supply voltage, so that after the DC-DC converter adjusts the charging request voltage of the vehicle battery, the actual supply voltage of the vehicle controller can reach the charging target voltage of the vehicle battery.

[0022] Optionally, determining a charging target voltage of the vehicle battery according to the initial supply voltage includes:

[0023] When the initial supply voltage is less than a first preset voltage threshold, using the first preset voltage threshold as a charging target voltage;

[0024] When the initial power supply voltage is greater than or equal to the first preset voltage threshold, the initial power supply voltage is used as the charging target voltage.

[0025] Since the first preset voltage threshold is the open circuit voltage corresponding to the preset charge state of the vehicle battery, and in the process of determining the charging target voltage, the first preset voltage threshold and the initial supply voltage are fully considered, thereby avoiding the determined charging target voltage being too high, avoiding the supplementary voltage to the vehicle battery being too high, and further avoiding overcurrent of the vehicle battery, reducing the impact on the life and performance of the vehicle battery.

[0026] Optionally, determining an initial charging request voltage of the vehicle battery includes:

[0027] The current actual power supply voltage of the vehicle controller is obtained, and the current actual power supply voltage is used as the initial charging request voltage.

[0028] Optionally, after determining the initial charging request voltage of the vehicle battery, the method further includes:

[0029] If the DC-DC converter is not working, the current actual supply voltage of the vehicle controller continues to be used as the initial charging request voltage, thereby charging the vehicle battery.

[0030] Optionally, when the battery controller controlling the vehicle battery is not offline, the method further includes:

[0031] A charging request voltage sent by a battery controller is received, and a DC-DC converter is controlled according to the charging request voltage, wherein the charging request voltage sent by the battery controller is determined when the battery controller executes a battery charging control strategy.

[0032] On the other hand, a computer-readable storage medium is provided, on which a charging control program for a vehicle battery is stored. When the charging control program is executed by a processor, the charging control method for the vehicle battery described in the above aspect is implemented.

[0033] On the other hand, a vehicle controller is provided, comprising: a memory, a processor, and a vehicle battery charging control program stored in the memory and executable on the processor. When the processor executes the charging control program, the vehicle battery charging control method described in the above aspects is implemented.

[0034] In another aspect, a charging system for a vehicle battery is provided, comprising:

[0035] On-board power battery;

[0036] A DC-DC converter, suitable for converting the voltage output by the vehicle power battery to charge the vehicle battery;

[0037] A battery controller, suitable for controlling the vehicle battery;

[0038] The vehicle controller, the vehicle battery is connected to the vehicle controller and supplies power to the vehicle controller. The vehicle controller can obtain the current ambient temperature when the battery controller is offline, and determine the allowable charging current of the vehicle battery according to the current ambient temperature, as well as determine the initial charging request voltage of the vehicle battery, and obtain the output current of the DC-DC converter in the working state while controlling the DC-DC converter according to the initial charging request voltage, and adjust the charging request voltage of the vehicle battery according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0039] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. Taking into account the charging limit of the vehicle battery due to the current ambient temperature, it is possible to effectively avoid the charging current provided to the vehicle battery exceeding the current limit of the vehicle battery, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life and performance of the vehicle battery.

[0040] On the other hand, a vehicle is provided, comprising the vehicle controller described in the above aspect or the charging system of the vehicle battery described in the above aspect.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a vehicle battery charging control system provided in an embodiment of the present application;

[0043] Figure 2 is a flow chart of a vehicle battery charging control method provided in an embodiment of the present application;

[0044] Figure 3 is a flow chart of another vehicle battery charging control method provided in an embodiment of the present application;

[0045] Figure 4 It is a structural schematic diagram of a vehicle controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] The vehicle may include a storage battery, a vehicle controller, a battery controller, a DC-DC converter and a power battery. During the process of charging the storage battery, the vehicle controller may control the DC-DC converter based on the request voltage sent by the battery controller, so that the DC-DC converter controls the power battery to charge the storage battery.

[0055] In the related art, when the battery controller is offline, the request voltage sent by the vehicle controller to the DC-DC converter is usually a fixed value. However, this method may cause battery overcurrent and affect the battery life. At the same time, this method does not consider the impact of temperature on the battery, so the charging current provided to the battery may exceed the current limit of the battery, causing battery overcurrent, which in turn damages the performance and life of the battery.

[0056] The embodiment of the present application provides a method for controlling the charging of a vehicle battery, in which the vehicle controller obtains the current ambient temperature when the battery controller is offline, and determines the allowable charging current of the vehicle battery according to the current ambient temperature. The initial charging request voltage of the vehicle battery is determined, and the output current of the DC-DC converter in the working state is obtained while controlling the DC-DC converter according to the initial charging request voltage, and the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0057] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. Taking into account the charging limit of the vehicle battery due to the current ambient temperature, it is possible to effectively avoid the charging current provided to the vehicle battery exceeding the current limit of the vehicle battery, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life and performance of the vehicle battery.

[0058] The present application embodiment provides a vehicle, including a vehicle controller or a charging control system for a vehicle battery. Figure 1 As shown, the charging control system of the vehicle battery may include:

[0059] On-board power battery 10,

[0060] The DC-DC converter 20 is suitable for converting the voltage output by the vehicle-mounted power battery 10 to charge the vehicle-mounted battery 001 .

[0061] Optionally, the DC-DC converter 20 is suitable for converting the voltage output by the vehicle-mounted power battery 10 and providing a direct current to the vehicle-mounted battery 001 to charge the vehicle-mounted battery 001 .

[0062] Among them, the vehicle-mounted battery 001 can be a storage battery. For example, the vehicle-mounted battery 001 can be a lithium battery. The lithium battery can be a lithium iron phosphate (LiFePO4, LFP) battery, and the capacity of the lithium battery can be 20 ampere hours (Ah).

[0063] The battery controller 30 is suitable for controlling the vehicle-mounted battery 001 .

[0064] The vehicle control unit 40 (VCU), the vehicle battery 001 is connected to the vehicle control unit 40 and supplies power to the vehicle control unit 40.

[0065] The DC-DC converter 20 is also suitable for converting the voltage output by the vehicle power battery 10 to charge the vehicle load 50 .

[0066] Figure 2 is a flow chart of a vehicle battery charging control method provided in an embodiment of the present application, which is applied to a vehicle controller, such as Figure 2 As shown, the method includes:

[0067] Step 201: When the battery controller is offline, obtain the current ambient temperature, and determine the allowable charging current of the vehicle battery according to the current ambient temperature.

[0068] In an embodiment of the present application, when the battery controller 30 is offline, the vehicle controller 40 can obtain the current ambient temperature and determine the allowable charging current of the vehicle battery 001 based on the current ambient temperature.

[0069] Optionally, a temperature sensor may be provided in the charging control system, and the temperature sensor is used to detect the ambient temperature. The vehicle controller 40 may obtain the ambient temperature from the temperature sensor.

[0070] Step 202: determine the initial charge request voltage of the vehicle battery, and obtain the output current of the DC-DC converter in the working state while controlling the DC-DC converter according to the initial charge request voltage, and adjust the charge request voltage of the vehicle battery according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0071] After determining the allowable charging current of the vehicle battery 001 according to the current ambient temperature, the vehicle controller 40 can determine the initial charging request voltage of the vehicle battery 001, and while controlling the DC-DC converter 20 according to the initial charging request voltage, obtain the output current of the DC-DC converter 20 in the working state, and adjust the charging request voltage of the vehicle battery 001 according to the output current of the DC-DC converter 20 in the working state and the allowable charging current.

[0072] In summary, the embodiment of the present application provides a charging control method for a vehicle-mounted battery, in which the vehicle controller obtains the current ambient temperature when the battery controller is offline, and determines the allowable charging current of the vehicle-mounted battery according to the current ambient temperature. The initial charging request voltage of the vehicle-mounted battery is determined, and when the DC-DC converter is controlled according to the initial charging request voltage, the output current of the DC-DC converter in the working state is obtained, and the charging request voltage of the vehicle-mounted battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0073] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. Taking into account the charging limit of the vehicle battery due to the current ambient temperature, it is possible to effectively avoid the charging current provided to the vehicle battery exceeding the current limit of the vehicle battery, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life and performance of the vehicle battery.

[0074] Figure 3 is a flow chart of another vehicle battery charging control method provided in an embodiment of the present application, which is applied to a vehicle controller, such as Figure 3 As shown, the method includes:

[0075] Step 301: When the battery controller is offline, obtain the current ambient temperature, and determine the allowable charging current of the vehicle battery according to the current ambient temperature.

[0076] The charging control system may also include: a body control module (BCM), an on board charger (OBC) and a battery management system (BMS).

[0077] While detecting the vehicle body status, the BCM can also monitor the voltage of the vehicle battery 001 in real time. When the voltage of the vehicle battery 001 is lower than the preset voltage, the BCM can wake up the OBC, and then the OBC wakes up the battery controller 30, the BMS and the vehicle controller 40. The vehicle controller 40 sends a high-voltage instruction to the BMS so that the BMS controls the high-voltage power-on, and the BMS is also used to control the vehicle power battery 10. Among them, the voltage of the vehicle battery 001 is lower than the preset voltage, which may be caused by the long-term storage and unused of the vehicle battery 001. For example, the preset voltage can be 11.4 volts (V).

[0078] When the battery controller 30 is offline, the vehicle controller 40 can obtain the current ambient temperature and determine the allowable charging current of the vehicle battery 001 according to the current ambient temperature. The allowable charging current is the maximum charging current provided to the vehicle battery 001.

[0079] When the battery controller 30 is not offline, the vehicle controller 40 can receive the charging request voltage sent by the battery controller 30, and control the DC-DC converter 20 according to the charging request voltage, so that the DC-DC converter 20 converts the voltage output by the vehicle power battery 10 to charge the vehicle battery 001. Among them, the charging request voltage sent by the battery controller 30 is determined when the battery controller 30 executes the battery charging control strategy, and the battery charging control strategy can be pre-stored in the battery controller 30. Therefore, if the vehicle controller 40 does not receive the charging request voltage sent by the battery controller 30 within a preset time length, it can be determined that the battery controller 30 is offline. The preset time length can be pre-stored in the vehicle controller 40.

[0080] When the battery controller 30 is not offline, the vehicle controller 40 can send the charging request voltage to the DC-DC converter 20, and the DC-DC converter 20 can convert the voltage output by the vehicle power battery 10 based on the charging request voltage, and then provide the vehicle battery 001 with an output current corresponding to the charging request voltage to charge the vehicle battery 001. The magnitude of the output current is related to the magnitude of the charging request voltage sent by the vehicle controller 40 to the DC-DC converter 20.

[0081] A temperature sensor may also be provided in the charging control system, and the temperature sensor is used to detect the ambient temperature. The vehicle controller 40 may obtain the current ambient temperature from the temperature sensor.

[0082] In the embodiment of the present application, the vehicle controller 40 may pre-store a correspondence between the ambient temperature and the charging current, and the charging current in the correspondence is the charging current of the vehicle battery 001. After obtaining the current ambient temperature, the vehicle controller 40 may determine the allowable charging current corresponding to the current ambient temperature from the correspondence.

[0083] For example, the corresponding relationship can be shown in Table 1 and Table 2. The current ambient temperature is -25 degrees Celsius (° C.), and the vehicle controller 40 can determine from the following Table 1 that the allowable charging current corresponding to the current ambient temperature is 6 amperes (A).

[0084] Table 1

[0085] Ambient temperature / ℃ <-30 -30 -25 -20 -15 -10 -5 0 5 10 Charging current / A 0 2.6 6 12.4 20 28 34 40 40 40

[0086] Table 2

[0087] Ambient temperature / ℃ 15 20 25 30 35 40 45 50 55 60 Charging current / A 60 60 60 40 40 30 30 20 20 20

[0088] Step 302: Obtain the initial power supply voltage of the vehicle controller, and determine the charging target voltage of the vehicle battery according to the initial power supply voltage.

[0089] After determining the allowable charging current of the vehicle battery 001 according to the current ambient temperature, the vehicle controller 40 can obtain the initial supply voltage of the vehicle controller 40, and determine the charging target voltage of the vehicle battery 001 according to the initial supply voltage. The initial supply voltage can be the supply voltage provided by the vehicle battery 001 detected by the vehicle controller 40 at the wake-up time. The wake-up time refers to the time when the vehicle controller 40 is awakened after the current power-on.

[0090] The process of the vehicle controller 40 determining the charging target voltage of the vehicle battery 001 according to the initial power supply voltage may include the following steps:

[0091] A1. Detect whether the initial supply voltage is less than a first preset voltage threshold.

[0092] After obtaining the initial power supply voltage, the vehicle controller 40 can detect whether the initial power supply voltage is less than the first preset voltage threshold. If the initial power supply voltage is less than the first preset voltage threshold, the vehicle controller 40 can execute step A2. If the initial power supply voltage is greater than or equal to the first preset voltage threshold, execute step A3.

[0093] The first preset voltage threshold may be an open circuit voltage (OCV) corresponding to a preset state of charge (SOC) of the vehicle battery 001. For example, the preset SOC may be 10% SOC, and the first preset voltage threshold may be 12.8V.

[0094] Step A2: using the first preset voltage threshold as the charging target voltage.

[0095] When the initial power supply voltage is less than the first preset voltage threshold, the vehicle controller 40 may use the first preset voltage threshold as the charging target voltage.

[0096] Assuming that the first preset voltage threshold is 12.8V and the initial supply voltage V0 is less than 12.8V, the charging target voltage Ve=12.8V.

[0097] Step A3: taking the initial supply voltage as the charging target voltage.

[0098] When the initial power supply voltage is greater than or equal to the first preset voltage threshold, the vehicle controller 40 may use the initial power supply voltage as the charging target voltage.

[0099] Assuming that the first preset voltage threshold is 12.8V and the initial supply voltage V0 is greater than 12.8V, the charging target voltage Ve=V0.

[0100] The applicant of the present application has found that in the related art, the requested voltage sent by the vehicle controller 40 to the DC-DC converter 20 is usually a fixed value. This method does not take into account the magnitude of the voltage to be supplemented to the battery, which may result in an excessively large voltage being supplemented to the battery, thereby causing the battery to overcurrent and affecting the battery life.

[0101] In an embodiment of the present application, by detecting whether the initial supply voltage is less than a first preset voltage threshold, and when the initial supply voltage is less than the first preset voltage threshold, the first preset voltage threshold is used as the charging target voltage, and when the initial supply voltage is greater than or equal to the first preset voltage threshold, the initial supply voltage is used as the charging target voltage.

[0102] Since the first preset voltage threshold is the open circuit voltage corresponding to the preset state of charge of the vehicle battery 001, and the first preset voltage threshold and the initial supply voltage are fully considered in the process of determining the charging target voltage, it is possible to avoid the determined charging target voltage being too high, avoid the voltage supplemented to the vehicle battery 001 being too high, and further avoid the vehicle battery 001 from being overcurrent, thereby reducing the impact on the life of the vehicle battery 001.

[0103] Step 303: Obtain the current actual power supply voltage of the vehicle controller, and use the current actual power supply voltage as the initial charging request voltage.

[0104] After determining the charging target voltage of the vehicle battery 001 according to the initial power supply voltage, the vehicle controller 40 can obtain the current actual power supply voltage of the vehicle controller 40 and use the current actual power supply voltage as the initial charging request voltage.

[0105] The current actual power supply voltage refers to the voltage actually provided by the vehicle battery 001 to the vehicle controller 40 at the current moment. The vehicle controller 40 can detect the voltage actually supplied by the vehicle battery 001 at the current moment, thereby obtaining the current actual power supply voltage.

[0106] Step 304: Detect whether the DC-DC converter is working.

[0107] After using the current actual supply voltage as the initial charging request voltage, the vehicle controller 40 can detect whether the DC-DC converter 20 is working. If the DC-DC converter 20 is in working state, step 305 can be executed. If the DC-DC converter 20 is not working, step 303 can be continued.

[0108] Step 305: Control the DC-DC converter according to the initial charging request voltage, and determine the charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter in the working state.

[0109] After determining that the DC-DC converter 20 is in a working state, the vehicle controller 40 can control the DC-DC converter 20 according to the initial charging request voltage, and when controlling the DC-DC converter 20 according to the initial charging request voltage, the charging request voltage change information can be determined based on the output current and the allowed charging current of the DC-DC converter 20 in the working state.

[0110] Optionally, the vehicle controller 40 can send the initial charging request voltage to the DC-DC converter 20, and the DC-DC converter 20 can convert the voltage output by the vehicle power battery 10 based on the initial charging request voltage, and then provide the vehicle battery 001 with an output current corresponding to the initial charging request voltage to charge the vehicle battery 001.

[0111] It can be understood that when the vehicle controller 40 controls the DC-DC converter 20 according to the initial charging request voltage, the output current of the DC-DC converter 20 in the working state is determined based on the initial charging request voltage.

[0112] After the vehicle controller 40 determines and adjusts the charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter 20 in the working state, it can update the initial charging request voltage output to the DC-DC converter based on the charging request voltage change information. In addition, during the process of charging the vehicle battery 001, the vehicle controller 40 can determine the charging request voltage change information in real time or periodically according to the output current and the allowed charging current of the DC-DC converter 20 in the working state, and then adjust the charging request voltage output to the DC-DC converter 20 according to the charging request voltage change information.

[0113] The process of the vehicle controller 40 determining the charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter 20 in the working state may include the following steps:

[0114] B1. Detect whether the output current of the DC-DC converter in a working state is less than or equal to a first preset current threshold.

[0115] The vehicle controller 40 can detect whether the output current of the DC-DC converter 20 in the working state is less than or equal to the first preset current threshold. When the output current of the DC-DC converter 20 in the working state is less than or equal to the first preset current threshold, the vehicle controller 40 can determine that the output current of the DC-DC converter 20 in the working state is small, so step B2 can be executed. When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, the vehicle controller 40 can execute step B3.

[0116] Among them, the first preset current threshold can be pre-stored in the vehicle controller 40. By way of example, the first preset current threshold can be 0A.

[0117] B2. Determine the first voltage rising rate as the charging request voltage change information.

[0118] When the output current of the DC-DC converter 20 in the working state is less than or equal to the first preset current threshold, the vehicle controller 40 can determine the first voltage rising rate as the charging request voltage change information, thereby quickly increasing the charging request voltage.

[0119] Among them, the first voltage rising rate can be pre-stored in the vehicle controller 40. By way of example, the first voltage rising rate can be 50 millivolts (mv) / 100 milliseconds (ms).

[0120] B3. Detect that the output current of the DC-DC converter in the working state is less than or equal to the allowable charging current.

[0121] When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, the vehicle controller 40 can detect whether the output current of the DC-DC converter 20 in the working state is less than or equal to the allowable charging current. Among them, the allowable charging current is greater than the first preset current threshold.

[0122] If the output current of the DC-DC converter 20 in the working state is less than or equal to the allowable charging current, step B4 can be executed. If the output current of the DC-DC converter 20 in the working state is greater than the allowable charging current, step B5 can be executed.

[0123] Assume that the first preset current threshold is 0A. If 0 < the output current I of the DC-DC converter 20 in the working state <= the allowable charging current I0, the vehicle controller 40 can execute step B4. If the allowable charging current I0 < the output current I of the DC-DC converter 20 in the working state, the vehicle controller 40 can execute step B5.

[0124] Step B4. Determine the second voltage rising rate as the charging request voltage change information.

[0125] When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, if the output current of the DC-DC converter 20 in the working state is less than or equal to the allowed charging current, the vehicle controller 40 can determine the second voltage rise rate as the charging request voltage change information, thereby quickly increasing the charging request voltage.

[0126] Since the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold and less than or equal to the allowed charging current, the second voltage rise rate can be less than the first voltage rise rate. In addition, the second voltage rise rate can be pre-stored in the vehicle controller 40. For example, the second voltage rise rate can be 10mv / 100ms.

[0127] Step B5: Keep the charging request voltage of the vehicle battery unchanged.

[0128] When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, if the output current of the DC-DC converter 20 in the working state is greater than the allowable charging current, the vehicle controller 40 can determine that the output current of the DC-DC converter 20 in the working state is large, so the charging request voltage of the vehicle battery 001 can be kept unchanged.

[0129] The charging request voltage may be an initial charging request voltage, or a charging request voltage adjusted by the vehicle controller based on a voltage rise rate.

[0130] Step 306: Adjust the charging request voltage of the vehicle battery according to the charging request voltage change information.

[0131] After determining the charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter 20 in the working state, the vehicle controller 40 can adjust the charging request voltage of the vehicle battery 001 according to the charging request voltage change information.

[0132] Since the vehicle battery 001 supplies power to the vehicle controller 40, the vehicle controller 40 continuously increases the charging request voltage of the vehicle battery 001 while adjusting the charging request voltage of the vehicle battery 001 according to the output current of the DC-DC converter 20 in the working state and the allowed charging current, thereby continuously increasing the actual power supply voltage of the vehicle controller 40, thereby enabling the actual power supply voltage of the vehicle controller 40 to reach the charging target voltage of the vehicle battery 001.

[0133] In an embodiment of the present application, the vehicle controller 40 adjusts the charging request voltage of the vehicle battery 001 according to the charging request voltage change information, thereby reducing the impact of the voltage rise rate, effectively preventing the charging current from exceeding the current limit of the vehicle battery, and further preventing the vehicle battery from overcurrent, thereby reducing the impact on the life of the vehicle battery 001.

[0134] Furthermore, by detecting the relationship between the output current of the DC-DC converter 20 in the working state and the first preset current threshold and the allowed charging current, different voltage rise rates are selected as the charging request voltage change information, thereby improving the accuracy of the determined voltage rise rate and the precision of the charging control of the vehicle battery 001. It effectively prevents the charging current from exceeding the current limit of the vehicle battery, thereby preventing the battery of the vehicle battery from overcurrent; at the same time, it also ensures a faster charging speed and charging efficiency.

[0135] In summary, the embodiment of the present application provides a charging control method for a vehicle-mounted battery, in which the vehicle controller obtains the current ambient temperature when the battery controller is offline, and determines the allowable charging current of the vehicle-mounted battery according to the current ambient temperature. The initial charging request voltage of the vehicle-mounted battery is determined, and when the DC-DC converter is controlled according to the initial charging request voltage, the output current of the DC-DC converter in the working state is obtained, and the charging request voltage of the vehicle-mounted battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0136] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. This can effectively prevent the charging current from exceeding the current limit of the vehicle battery while considering the charging limit of the vehicle battery due to the current ambient temperature, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life of the vehicle battery.

[0137] When the voltage of the vehicle battery is low, the solution provided by the embodiment of the present application can be used to recharge the vehicle battery, thereby increasing the intelligence level of the new energy vehicle and improving the user experience.

[0138] The present application embodiment provides a computer-readable storage medium on which a vehicle-mounted battery charging control program is stored. When the charging control program is executed by a processor, the vehicle-mounted battery charging control method described in the above embodiment is implemented. Figure 3 The charging control method of the vehicle battery is shown.

[0139] Figure 4 is a schematic diagram of the structure of a vehicle controller provided in an embodiment of the present application, such as Figure 4As shown, the vehicle controller 40 includes: a memory 401, a processor 402, and a vehicle battery charging control program stored in the memory 401 and executable on the processor 402. When the processor 402 executes the charging control program, the vehicle battery charging control method described in the above embodiment is implemented. Figure 3 The charging control method of the vehicle battery is shown.

[0140] refer to Figure 1 , the vehicle controller 40 is configured as follows:

[0141] When the battery controller 30 is offline, the current ambient temperature is obtained, and the allowable charging current of the vehicle battery 001 is determined based on the current ambient temperature, as well as the initial charging request voltage of the vehicle battery 001. When the DC-DC converter 20 is controlled based on the initial charging request voltage, the output current of the DC-DC converter 20 in the working state is obtained, and the charging request voltage of the vehicle battery 001 is adjusted based on the output current of the DC-DC converter 20 in the working state and the allowable charging current.

[0142] Optionally, the vehicle controller 40 is configured as:

[0143] Determine charging request voltage change information according to the output current and the allowed charging current of the DC-DC converter 20 in the working state;

[0144] The charging request voltage of the vehicle battery 001 is adjusted according to the charging request voltage change information.

[0145] Optionally, the vehicle controller 40 is configured as:

[0146] When the output current of the DC-DC converter 20 in the working state is less than or equal to the first preset current threshold, determining a first voltage rising rate as the charging request voltage change information;

[0147] When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, if the output current of the DC-DC converter 20 in the working state is less than or equal to the allowed charging current, a second voltage rise rate is determined as the charging request voltage change information, wherein the second voltage rise rate is less than the first voltage rise rate.

[0148] Optionally, the vehicle controller 40 is further configured as:

[0149] When the output current of the DC-DC converter 20 in the working state is greater than the first preset current threshold, if the output current of the DC-DC converter 20 in the working state is greater than the allowed charging current, the charging request voltage of the vehicle battery 001 is kept unchanged.

[0150] Optionally, the vehicle controller 40 is further configured as:

[0151] Before controlling the DC-DC converter 20 according to the initial charging request voltage, the initial power supply voltage of the vehicle controller 40 is obtained, and the charging target voltage of the vehicle battery 001 is determined based on the initial power supply voltage, so that after the DC-DC converter 20 adjusts the charging request voltage of the vehicle battery 001, the actual power supply voltage of the vehicle controller 40 can reach the charging target voltage of the vehicle battery 001.

[0152] Optionally, the vehicle controller 40 is configured as:

[0153] When the initial supply voltage is less than a first preset voltage threshold, using the first preset voltage threshold as a charging target voltage;

[0154] When the initial power supply voltage is greater than or equal to the first preset voltage threshold, the initial power supply voltage is used as the charging target voltage.

[0155] Optionally, the vehicle controller 40 is configured as:

[0156] The current actual power supply voltage of the vehicle controller 40 is obtained, and the current actual power supply voltage is used as the initial charging request voltage.

[0157] Optionally, the vehicle controller 40 is further configured as:

[0158] After the initial charging request voltage of the vehicle battery 001 is determined, if the DC-DC converter 20 is not working, the current actual power supply voltage of the vehicle controller 40 continues to be used as the initial charging request voltage.

[0159] Optionally, the vehicle controller 40 is further configured as:

[0160] When the battery controller 30 controlling the vehicle battery 001 is not offline, the charging request voltage sent by the battery controller 30 is received, and the DC-DC converter 20 is controlled according to the charging request voltage, wherein the charging request voltage sent by the battery controller 30 is determined when the battery controller 30 executes the battery charging control strategy.

[0161] In summary, the embodiment of the present application provides a charging control system for a vehicle-mounted battery. When the battery controller is offline, the vehicle controller obtains the current ambient temperature and determines the allowable charging current of the vehicle-mounted battery according to the current ambient temperature. The initial charging request voltage of the vehicle-mounted battery is determined, and when the DC-DC converter is controlled according to the initial charging request voltage, the output current of the DC-DC converter in the working state is obtained, and the charging request voltage of the vehicle-mounted battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current.

[0162] Since the current determined by the vehicle controller based on the current ambient temperature is the allowable charging current of the vehicle battery, the charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowable charging current. Taking into account the charging limit of the vehicle battery due to the current ambient temperature, it can effectively prevent the charging current from exceeding the current limit of the vehicle battery, thereby avoiding overcurrent of the vehicle battery and reducing the impact on the life of the vehicle battery.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for controlling charging of a vehicle battery, characterized in that: The vehicle-mounted battery is connected to a vehicle controller and supplies power to the vehicle controller. The method includes: Acquiring the current ambient temperature, and determining the allowable charging current of the vehicle battery according to the current ambient temperature; Determine an initial charge request voltage of the vehicle battery, and while controlling the DC-DC converter according to the initial charge request voltage, obtain the output current of the DC-DC converter in a working state, and adjust the charge request voltage of the vehicle battery according to the output current of the DC-DC converter in a working state and the allowed charging current, wherein the DC-DC converter is suitable for converting the voltage output by the vehicle power battery to charge the vehicle battery.

2. The charging control method according to claim 1, characterized in that: The charging request voltage of the vehicle battery is adjusted according to the output current of the DC-DC converter in the working state and the allowed charging current, including: Determining charging request voltage change information according to the output current of the DC-DC converter in a working state and the allowed charging current; The charging request voltage of the vehicle battery is adjusted according to the charging request voltage change information.

3. The charging control method according to claim 2, characterized in that: Determining charging request voltage change information according to the output current of the DC-DC converter in a working state and the allowed charging current, including: When the output current of the DC-DC converter in the working state is less than or equal to a first preset current threshold, determining a first voltage rising rate as the charging request voltage change information; When the output current of the DC-DC converter in a working state is greater than a first preset current threshold, if the output current of the DC-DC converter in a working state is less than or equal to the allowed charging current, a second voltage rise rate is determined as the charging request voltage change information, wherein the second voltage rise rate is less than the first voltage rise rate.

4. The charging control method according to claim 3, characterized in that: When the output current of the DC-DC converter in the working state is greater than the first preset current threshold, the method further includes: If the output current of the DC-DC converter in the working state is greater than the allowable charging current, the charging request voltage of the vehicle battery is kept unchanged.

5. The charging control method according to any one of claims 1 to 4, characterized in that: Before controlling the DC-DC converter according to the initial charging request voltage, the method further includes: The initial power supply voltage of the vehicle controller is obtained, and the charging target voltage of the vehicle battery is determined according to the initial power supply voltage, so that after the DC-DC converter adjusts the charging request voltage of the vehicle battery, the actual power supply voltage of the vehicle controller can reach the charging target voltage of the vehicle battery.

6. The charging control method according to claim 5, characterized in that: Determining a charging target voltage of the vehicle battery according to the initial supply voltage includes: When the initial power supply voltage is less than a first preset voltage threshold, using the first preset voltage threshold as the charging target voltage; When the initial power supply voltage is greater than or equal to a first preset voltage threshold, the initial power supply voltage is used as the charging target voltage.

7. The charging control method according to any one of claims 1 to 4, characterized in that: Determining an initial charging request voltage of the vehicle battery includes: The current actual power supply voltage of the vehicle controller is obtained, and the current actual power supply voltage is used as the initial charging request voltage.

8. The charging control method according to claim 7, characterized in that: After determining the initial charging request voltage of the vehicle battery, the method further includes: If the DC-DC converter is not working, the current actual power supply voltage of the vehicle controller continues to be used as the initial charging request voltage.

9. The charging control method according to claim 1, characterized in that: In the case where the battery controller controlling the vehicle-mounted battery is not offline, the method further includes: Receive a charging request voltage sent by the battery controller, and control the DC-DC converter according to the charging request voltage, wherein the charging request voltage sent by the battery controller is determined when the battery controller executes a battery charging control strategy.

10. A computer-readable storage medium, characterized in that: A charging control program for a vehicle battery is stored thereon, and when the charging control program is executed by a processor, a charging control method for a vehicle battery according to any one of claims 1 to 9 is implemented.

11. A vehicle controller, characterized in that: include: A memory, a processor, and a charging control program for a vehicle battery stored in the memory and executable on the processor. When the processor executes the charging control program, the charging control method for the vehicle battery according to any one of claims 1 to 9 is implemented.

12. A charging control system for a vehicle battery, characterized in that: include: On-board power battery; A DC-DC converter, adapted to convert the voltage output by the vehicle-mounted power battery to charge the vehicle-mounted battery; A battery controller, adapted to control the vehicle-mounted battery; A vehicle controller, the vehicle battery is connected to the vehicle controller and supplies power to the vehicle controller, and the vehicle controller can obtain the current ambient temperature when the battery controller is offline, and determine the allowable charging current of the vehicle battery according to the current ambient temperature, as well as determine the initial charging request voltage of the vehicle battery, and obtain the output current of the DC-DC converter in a working state while controlling the DC-DC converter according to the initial charging request voltage, and adjust the charging request voltage of the vehicle battery according to the output current of the DC-DC converter in a working state and the allowable charging current.

13. A vehicle, characterized in that: It includes the vehicle controller according to claim 11 or the vehicle battery charging control system according to claim 12.

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