Standby power supply control method and device and vehicle

Abstract

The invention discloses a standby power supply control method and device and a vehicle, and the method comprises the steps: obtaining the voltage of a storage battery when the storage battery supplies power; if the voltage of the storage battery is smaller than a low-voltage threshold value, the vehicle state is obtained, and a standby power switch of a standby power supply is controlled to be switched on to replace the storage battery for power supply; and after a standby power supply switch for controlling a standby power supply is closed, determining an executed control power supply strategy according to the vehicle state. Therefore, no extra equipment cost needs to be increased, and the power battery can be used as a standby power supply of the vehicle only by connecting part of battery cells in the middle of the power battery in series. When it is detected that the voltage of the storage battery is low, low-voltage power supply of the vehicle in a short time is guaranteed by starting the standby power supply, meanwhile, according to the specific vehicle state of the vehicle, safety control is conducted on the vehicle power supply through different power supply control strategies, and therefore the driving safety of the vehicle is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a backup power supply control method, device and vehicle. Background Art

[0002] The power source in new energy vehicles generally includes storage batteries and power batteries. Power batteries are composed of multiple single cells connected in series and parallel and protected by high-strength steel. They are usually installed in the chassis of the car, and storage batteries are generally installed in the front cabin or trunk. Storage batteries mainly provide low-voltage electricity for the vehicle's controller, which has an important impact on driving safety.

[0003] However, during the use of the vehicle, the battery will age, which may cause the vehicle to fail to start or break down due to low voltage while driving. In addition, when the vehicle is involved in a serious head-on or rear-end collision, the battery and its wiring harness may be damaged, resulting in the inability to unlock the doors in time or to send a distress signal, affecting driving safety. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a backup power supply control method, device and vehicle, which ensure low-voltage power supply to the vehicle and improve the driving safety of the vehicle without adding additional power supply equipment.

[0005] According to a first aspect of the present invention, a backup power control method is provided, which is applied to a vehicle, wherein the vehicle comprises a power battery, a storage battery, a power battery switch and a backup power switch, wherein the power battery is connected to the power battery switch, and some of the series-connected cells in the power battery are connected to the backup power switch as a backup power source;

[0006] The backup power supply control method comprises:

[0007] When the battery is used for power supply, the battery voltage is obtained;

[0008] If the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and a backup power switch of the backup power supply is controlled to close to replace the battery for power supply;

[0009] After the backup power switch for controlling the backup power is closed, a control power strategy to be executed is determined according to the vehicle state.

[0010] Optionally, determining a control power strategy to be executed according to the vehicle state includes:

[0011] If the vehicle state is a driving state, the backup power switch of the backup power supply is controlled to be disconnected after the driving data meets the safety conditions;

[0012] If the vehicle is in a stationary start state and the power battery switch is disconnected, the power battery switch of the power battery is controlled to be closed to increase the vehicle voltage to a preset voltage;

[0013] If the vehicle state is a collision state, the power battery switch of the power battery is controlled to be disconnected.

[0014] Optionally, if the vehicle state is a collision state, controlling a power battery switch of the power battery to be disconnected includes:

[0015] If the target collision data sent by the airbag controller is received, the target collision data is stored in the target non-volatile memory of the battery management system controller, and the power battery switch of the power battery is controlled to be disconnected.

[0016] Optionally, before the step of receiving target collision data sent by the airbag controller, storing the target collision data in a target non-volatile memory of the battery management system controller, and controlling the power battery switch of the power battery to be disconnected, the method further includes:

[0017] If the airbag controller receives the collision data, determining whether the collision data is greater than a collision threshold;

[0018] If the collision data is greater than the collision threshold, the collision data is used as target collision data, and the airbag controller sends the target collision data.

[0019] Optionally, the method further includes:

[0020] If the airbag controller loses power or restarts, reading the target collision data stored in the target non-volatile memory and sending the target collision data to the airbag controller;

[0021] The airbag controller continuously sends target collision data to the vehicle body controller;

[0022] The vehicle body controller controls the opening of vehicle doors and / or windows according to the target collision data.

[0023] Optionally, if the vehicle state is a driving state, then after the driving data meets a safety condition, controlling the backup power switch of the backup power supply to be disconnected includes:

[0024] If the vehicle state is a driving state, obtaining the vehicle speed;

[0025] If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed;

[0026] When the vehicle speed is less than the target vehicle speed and a first period of time has passed, a backup power switch of the backup power supply is controlled to be disconnected.

[0027] Optionally, if the vehicle state is a driving state, then after the driving data meets a safety condition, controlling the backup power switch of the backup power supply to be disconnected includes:

[0028] If the vehicle state is a driving state, obtaining the vehicle speed;

[0029] If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed;

[0030] When the vehicle speed is less than the target vehicle speed and within the second time period, if it is detected that the vehicle speed is 0, the backup power switch of the backup power supply is controlled to be disconnected.

[0031] According to a second aspect of the present invention, there is provided a backup power supply control device, characterized in that it is arranged on a vehicle, the vehicle further comprising a power battery, a storage battery, a power battery switch and a backup power supply switch, the power battery is connected to the power battery switch to provide high voltage power to the vehicle; some of the series-connected cells in the power battery are connected to the backup power supply switch as a backup power supply to replace the storage battery to provide low voltage power to the vehicle;

[0032] The backup power control device is used to obtain the battery voltage when the battery is supplying power, and when the battery voltage is less than the low voltage threshold, control the backup power switch of the backup power supply to close to replace the battery for supplying power.

[0033] Optionally, the backup power supply control device includes:

[0034] An acquisition module, used for acquiring the battery voltage when the battery is powered;

[0035] a first control module, configured to obtain a vehicle state and control a backup power switch of a backup power source to close to supply power instead of the battery if the battery voltage is less than a low voltage threshold;

[0036] The second control module is used to determine a control power strategy to be executed according to the vehicle state after the backup power switch of the backup power is closed.

[0037] According to a third aspect of the present invention, a controller is provided, the controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the aforementioned backup power control method.

[0038] According to a fourth aspect of the present invention, a vehicle is provided, the vehicle comprising a vehicle body and a controller installed in the vehicle body, wherein the controller executes the aforementioned backup power control method.

[0039] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0040] The embodiments of this specification provide a backup power control method, device and vehicle, which obtain the battery voltage when the battery is supplying power; if the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and the backup power switch of the backup power is controlled to close to replace the battery power supply; after the backup power switch of the backup power is controlled to close, the control power strategy to be executed is determined according to the vehicle status. In this way, there is no need to increase the equipment cost, and only some of the cells in the middle of the power battery need to be connected in series to serve as the backup power supply of the vehicle. When it is detected that the battery voltage is low, the backup power supply is enabled to ensure the low-voltage power supply of the vehicle in a short time. At the same time, according to the specific vehicle status of the vehicle, different control power strategies are used to safely control the vehicle power supply, thereby further improving the driving safety of the vehicle.

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

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the accompanying drawings, the same reference figures are used to represent the same components. In the drawings:

[0043] Figure 1 A flow chart of a backup power supply control method in an embodiment of the present invention is shown.

[0044] Figure 2 A schematic diagram of a backup power supply in an embodiment of the present invention is shown.

[0045] Figure 3 A block diagram of a backup power supply control device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The embodiment of the present invention provides a backup power supply control method, combining Figure 1 As shown in the flowchart, the backup power control method includes steps 101 to 103:

[0051] Step 101: When the battery is powered, obtain the battery voltage;

[0052] In this embodiment, the vehicle refers to a new energy vehicle. The power source of the vehicle generally includes a power battery and a storage battery. Among them, the power battery is composed of multiple single cells connected in series and parallel, and is protected by high-strength steel. It is usually installed in the chassis of the car, and the storage battery is generally installed in the front cabin or trunk.

[0053] Combination Figure 2As shown, in this embodiment, at least part of the cells in the power battery are connected in series as a backup power source. The two ends of the power battery are connected to the external circuit through the power battery switches K3 and K4, and the two ends of the backup power source are connected to the external circuit through the backup power switches K1 and K2. The backup power source can be used as a low-voltage power source for a short time to provide low-voltage power to various controllers and other components in the vehicle. The backup power source can be composed of multiple cells in the middle part of the power battery. In this way, even if the vehicle is seriously collided, the backup power source can be protected to the maximum extent.

[0054] In this embodiment, the backup power switch is a MOS tube, which can be integrated into the battery management system controller, and its driving voltage is about 5V. The power battery switch is a high-voltage relay and requires a 12V power supply for driving control.

[0055] It should be noted that since the backup power supply uses part of the cells in the power battery, the backup power supply cannot be used as a low-voltage power supply for a long time. Long-term use of the backup power supply will greatly reduce the voltage of some cells, resulting in excessive voltage difference in the power battery.

[0056] In actual use, the battery will inevitably age. When the battery ages and the voltage is low, it will affect the low-voltage power supply to the controller in the vehicle, which may cause the controller to work abnormally, such as the controller screen being off, etc. In addition, since most batteries are installed in the front cabin or trunk, if the vehicle collides, it is easy to cause damage to the battery, thereby affecting the low-voltage power supply to the controller.

[0057] Based on this, this embodiment needs to monitor the battery voltage in real time. Specifically, when the battery is supplying power, the battery management system controller will obtain the battery voltage in real time, compare the battery voltage with the low voltage threshold, and determine whether the battery is supplying power abnormally. Alternatively, the body controller obtains the battery voltage, and when it detects that the battery voltage is lower than the low voltage threshold, the body controller can send a command to the battery management system controller to enable the backup power supply.

[0058] It should be noted that the normal operating voltage of most controllers is 12-14V. If the voltage is lower than 9V, the controller may work abnormally. In this embodiment, the low voltage threshold value may be set within the range of 9-11V.

[0059] Step 102: If it is detected that the battery voltage is less than the low voltage threshold, the vehicle state is obtained, and the backup power switch of the backup power supply is controlled to be closed to replace the battery for power supply;

[0060] The vehicle status includes driving status, stationary start status and collision status. Different vehicle statuses affect the subsequent control of the power battery switch and the backup power switch.

[0061] In this embodiment, if it is detected that the battery voltage is less than the low voltage threshold, the vehicle status needs to be obtained. At the same time, the battery management system controller controls the backup power switch of the backup power supply to close, and starts the backup power supply to provide low voltage power to the controller in the vehicle to replace the battery power supply.

[0062] It should be noted that the battery voltage being less than the low voltage threshold may be caused by a variety of reasons, such as battery aging causing voltage reduction, or a problem with the vehicle's DCDC DC-DC converter, or battery damage caused by a vehicle collision.

[0063] Regardless of the cause, once it is detected that the battery voltage is lower than the low voltage threshold, it is necessary to control the backup power switch of the backup power supply to be closed as soon as possible, and enable the backup power supply to power each controller to prevent the controller from working abnormally and affect driving safety.

[0064] Step 103: After the backup power switch for controlling the backup power is closed, determining a control power strategy to be executed according to the vehicle state.

[0065] In this embodiment, different vehicle states correspond to different power control strategies. Specifically:

[0066] If the vehicle state is a driving state, after the driving data meets the safety condition, the backup power switch of the backup power supply is controlled to be disconnected;

[0067] If the vehicle is in a stationary start state and the power battery switch is disconnected, the power battery switch of the power battery is controlled to be closed to increase the vehicle voltage to a preset voltage;

[0068] If the vehicle state is a collision state, the power battery switch of the power battery is controlled to be disconnected.

[0069] In this embodiment, the driving state means that the vehicle has a certain speed and is moving. The stationary start state means that the vehicle is stationary and is about to move. The collision state means that the vehicle has a collision.

[0070] Under different vehicle conditions, the control of the backup power switch and the power battery switch is different.

[0071] In this embodiment, if the vehicle state is a driving state, it means that the vehicle is traveling at a certain speed. In this driving state, if the battery power is detected to be less than the low voltage threshold, it is very likely that there is a problem with the DC-DC converter, and the high voltage of the power battery cannot be converted into low voltage electricity. At this time, even if there is no problem with the battery, the battery cannot provide low voltage power to the controller for a long time. Generally, the power of the battery can effectively supply power to each controller for a certain period of time, such as 30 minutes. After exceeding this period, the battery voltage will also drop. Therefore, when the battery voltage is detected to be less than the low voltage threshold in the driving state, the backup power supply is enabled, but the backup power supply is only used to supply power to each controller for a preset period of time. If the preset period of time is exceeded, it is easy to cause the voltage difference between the cells of the power battery to be too large. Therefore, in the driving state, the backup power supply provides a certain buffer time for driving safety. During this period, the driving data needs to meet the safety conditions. The driving data includes the vehicle speed and the duration of speed limit driving.

[0072] The purpose of limiting the vehicle's speed is to make the vehicle's speed lower than the target speed and allow the vehicle to reach a safe area as much as possible.

[0073] For example, if the vehicle is in driving mode, the vehicle speed is obtained, and the vehicle speed is 58km / h. If the vehicle speed is detected to be greater than or equal to the target speed, the battery management system controller sends an alarm message to the instrument, prompting the driver of low-voltage power supply abnormality and suggesting that the driver reduce the speed. The vehicle will detect whether the speed is reduced. If the speed reduction is not detected within a certain period of time, the speed will be forcibly reduced to below the target speed, for example, 5km / h. If the speed reduction is detected within a certain period of time, and the speed is reduced to below the target speed of 5km / h.

[0074] When the vehicle speed is less than the target speed and after the first time period, the backup power switch controlling the backup power supply is turned off. The first time period should be less than the time the backup power supply can provide low-voltage power supply. For example, taking the five cells in the middle of the power battery connected in series as a backup power supply as an example, the first time period can be set to 30 minutes.

[0075] Alternatively, when the vehicle speed is less than the target speed and within the second time period, if the vehicle speed is detected to be 0, it means that the driver has actively braked and may have stopped the vehicle in a safe area. At this time, the backup power switch of the backup power supply can be controlled to disconnect.

[0076] In one embodiment, if the vehicle is in a stationary start state, the low voltage of the battery may be caused by the aging of the battery. At this time, the power battery switch of the power battery is closed, and the high voltage of the power battery can be converted into low voltage electricity through a DC-DC converter to power each controller, and the high voltage of the whole vehicle is completed at the same time to ensure normal driving. And after the high voltage of the whole vehicle is completed, the backup power switch of the backup power supply can be controlled to be disconnected.

[0077] In one embodiment, if a vehicle collides, the collision sensor in the vehicle will send the detected collision data to the airbag controller ACU (also known as the airbag controller). The airbag controller will judge the detected collision data. If the collision data is greater than the collision threshold, the collision data will be used as target collision data and transmitted to the battery management system controller BMS and the body controller BCM through the gateway.

[0078] It should be noted that after receiving the target collision data sent by the airbag controller, the battery management system controller will store the target collision data in the target non-volatile memory of the battery management system controller, and control the power battery switch of the power battery to disconnect, so that the vehicle disconnects the high-voltage circuit.

[0079] It is worth mentioning that when a serious collision occurs, the battery may be damaged and the battery may not be able to provide low voltage electricity, causing the airbag controller to lose power or restart. In actual driving, in order to ensure the safety of passengers, when a serious collision occurs, the airbag controller needs to continuously send collision data to the body controller so that the body controller can control the lowering of windows and the opening of doors. If the airbag controller loses power or restarts while continuously sending collision data, it may cause the body controller to not continuously receive collision data, affecting the lowering of windows and the unlocking of doors.

[0080] Based on this, after receiving the collision data sent by the airbag controller, the battery management system controller of this embodiment will store the collision data in the target non-volatile memory of the battery management system controller. After the airbag controller loses power or restarts, the battery management system controller reads the collision data stored in the target non-volatile memory and sends the collision data to the airbag controller; the airbag controller continuously sends collision data to the body controller; the body controller controls the unlocking of the doors and the lowering of the windows according to the collision data, providing convenience for passengers to escape or be rescued, and further improving driving safety.

[0081] In summary, the embodiment of this specification provides a backup power control method, which obtains the battery voltage when the battery is supplying power; if the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and the backup power switch of the backup power supply is controlled to close to replace the battery power supply; after the backup power switch of the backup power supply is controlled to close, the control power strategy to be executed is determined according to the vehicle status. In this way, there is no need to increase the equipment cost, and only some of the cells in the middle of the power battery need to be connected in series to serve as the backup power supply of the vehicle. When it is detected that the battery voltage is low, the low-voltage power supply of the vehicle is guaranteed for a short time by enabling the backup power supply. At the same time, according to the specific vehicle status of the vehicle, different control power strategies are used to safely control the vehicle power supply, thereby further improving the driving safety of the vehicle.

[0082] Based on the same inventive concept, Figure 3 As shown, an embodiment of the present invention further provides a backup power supply control device, which is arranged on a vehicle, wherein the vehicle further comprises a power battery, a storage battery, a power battery switch and a backup power supply switch, wherein the power battery is connected to the power battery switch to provide high voltage power to the vehicle; some of the series-connected cells in the power battery are connected to the backup power supply switch as a backup power supply to replace the storage battery to provide low voltage power to the vehicle;

[0083] The backup power control device is used to obtain the battery voltage when the battery is supplying power, and when the battery voltage is less than the low voltage threshold, control the backup power switch of the backup power supply to close to replace the battery for supplying power.

[0084] Optionally, the backup power supply control device includes:

[0085] An acquisition module, used for acquiring the battery voltage when the battery is powered;

[0086] a first control module, configured to obtain a vehicle state and control a backup power switch of a backup power source to close to supply power instead of the battery if the battery voltage is less than a low voltage threshold;

[0087] The second control module is used to determine a control power strategy to be executed according to the vehicle state after the backup power switch of the backup power is closed.

[0088] Optionally, the second control module is further used for:

[0089] If the vehicle state is a driving state, the backup power switch of the backup power supply is controlled to be disconnected after the driving data meets the safety conditions;

[0090] If the vehicle is in a stationary start state and the power battery switch is disconnected, the power battery switch of the power battery is controlled to be closed to increase the vehicle voltage to a preset voltage;

[0091] If the vehicle state is a collision state, the power battery switch of the power battery is controlled to be disconnected.

[0092] Optionally, the second control module is further used for:

[0093] If the target collision data sent by the airbag controller is received, the target collision data is stored in the target non-volatile memory of the battery management system controller, and the power battery switch of the power battery is controlled to be disconnected.

[0094] Optionally, the second control module is further used for:

[0095] If the airbag controller receives the collision data, determining whether the collision data is greater than a collision threshold;

[0096] If the collision data is greater than the collision threshold, the collision data is used as target collision data, and the airbag controller sends the target collision data.

[0097] Optionally, the second control module is further used for:

[0098] If the airbag controller loses power or restarts, reading the target collision data stored in the target non-volatile memory and sending the target collision data to the airbag controller;

[0099] The airbag controller continuously sends target collision data to the vehicle body controller;

[0100] The vehicle body controller controls the opening of vehicle doors and / or windows according to the target collision data.

[0101] Optionally, the second control module is further used for:

[0102] If the vehicle state is a driving state, obtaining the vehicle speed;

[0103] If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed;

[0104] When the vehicle speed is less than the target vehicle speed and a first period of time has passed, a backup power switch of the backup power supply is controlled to be disconnected.

[0105] Optionally, the second control module is further used for:

[0106] If the vehicle state is a driving state, obtaining the vehicle speed;

[0107] If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed;

[0108] When the vehicle speed is less than the target vehicle speed and within the second time period, if it is detected that the vehicle speed is 0, the backup power switch of the backup power supply is controlled to be disconnected.

[0109] In summary, the embodiment of this specification provides a backup power supply control device, which obtains the battery voltage when the battery is supplying power; if the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and the backup power switch of the backup power supply is controlled to close to replace the battery power supply; after the backup power switch of the backup power supply is controlled to close, the control power supply strategy to be executed is determined according to the vehicle status. In this way, there is no need to increase the equipment cost, and only some of the cells in the middle of the power battery need to be connected in series to serve as the backup power supply for the vehicle. When it is detected that the battery voltage is low, the backup power supply is enabled to ensure the low-voltage power supply of the vehicle in a short time. At the same time, according to the specific vehicle status of the vehicle, different control power supply strategies are used to safely control the vehicle power supply, thereby further improving the driving safety of the vehicle.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the backup power supply control device described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0111] Based on the same inventive concept, an embodiment of the present invention also provides a controller, which includes a backup power supply control device, a memory, a processor and a communication unit. The memory stores machine-readable instructions executable by the processor. When the controller is running, the processor and the memory communicate through a bus, the processor executes the machine-readable instructions, and executes the backup power supply control method.

[0112] The memory, the processor, and the communication unit are electrically connected to each other directly or indirectly to achieve signal transmission or interaction. For example, these elements can be electrically connected to each other via one or more communication buses or signal lines. The backup power control device includes at least one software function module that can be stored in the memory in the form of software or firmware. The processor is used to execute the executable module stored in the memory (for example, the software function module or computer program included in the backup power control device).

[0113] Among them, the memory can be, but is not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read On ly Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable read-only memory (Erasab le Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electrical Erasable Programmable Read-Only Memory, EEPROM), etc.

[0114] In some embodiments, the processor is used to perform one or more functions described in this embodiment. In some embodiments, the processor may include one or more processing cores (eg, a single-core processor (S) or a multi-core processor (S)).

[0115] In this embodiment, the memory is used to store the program, and the processor is used to execute the program after receiving the execution instruction. The process definition method disclosed in any implementation of this embodiment can be applied to the processor, or implemented by the processor.

[0116] The communication unit is used to establish a communication connection between the controller and other devices through the network, and to send and receive data through the network.

[0117] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0118] Based on the same inventive concept, an embodiment of the present invention also provides a vehicle, including a vehicle body, a battery management system controller installed in the vehicle body, and other controllers, wherein the battery management system controller is used to implement the aforementioned backup power control method.

[0119] In this embodiment, the vehicle refers to a new energy vehicle. The power source of the vehicle generally includes a power battery and a storage battery. Among them, the power battery is composed of multiple single cells connected in series and parallel, and is protected by high-strength steel. It is usually installed in the chassis of the car, and the storage battery is generally installed in the front cabin or trunk.

[0120] In summary, the embodiments of this specification provide a backup power control method, device and vehicle, which obtain the battery voltage when the battery is supplying power; if the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and the backup power switch of the backup power supply is controlled to close to replace the battery power supply; after the backup power switch of the backup power supply is controlled to close, the control power strategy to be executed is determined according to the vehicle status. In this way, there is no need to increase the equipment cost, and only some of the cells in the middle of the power battery need to be connected in series to serve as the backup power supply of the vehicle. When it is detected that the battery voltage is low, the backup power supply is enabled to ensure the low-voltage power supply of the vehicle in a short time. At the same time, according to the specific vehicle status of the vehicle, different control power strategies are used to safely control the vehicle power supply, thereby further improving the driving safety of the vehicle.

[0121] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller of the vehicle described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0122] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A backup power supply control method, characterized in that: Applied in a vehicle, the vehicle comprises a power battery, a storage battery, a power battery switch and a backup power switch, the power battery is connected to the power battery switch, and some of the series-connected cells in the power battery are connected to the backup power switch as a backup power source; The backup power supply control method comprises: When the battery is used for power supply, the battery voltage is obtained; If the battery voltage is less than the low voltage threshold, the vehicle status is obtained, and a backup power switch of the backup power supply is controlled to close to replace the battery for power supply; After the backup power switch for controlling the backup power is closed, a control power strategy to be executed is determined according to the vehicle state.

2. The method according to claim 1, characterized in that The step of determining the control power strategy to be executed according to the vehicle state includes: If the vehicle state is a driving state, after the driving data meets the safety condition, the backup power switch of the backup power supply is controlled to be disconnected; If the vehicle is in a stationary start state and the power battery switch is disconnected, the power battery switch of the power battery is controlled to be closed to increase the vehicle voltage to a preset voltage; If the vehicle state is a collision state, the power battery switch of the power battery is controlled to be disconnected.

3. The method according to claim 2, characterized in that If the vehicle state is a collision state, controlling a power battery switch of the power battery to be disconnected includes: If the target collision data sent by the airbag controller is received, the target collision data is stored in the target non-volatile memory of the battery management system controller, and the power battery switch of the power battery is controlled to be disconnected.

4. The method according to claim 3, characterized in that Before the step of receiving the target collision data sent by the airbag controller, storing the target collision data in the target non-volatile memory of the battery management system controller, and controlling the power battery switch of the power battery to be disconnected, the method further includes: If the airbag controller receives the collision data, determining whether the collision data is greater than a collision threshold; If the collision data is greater than the collision threshold, the collision data is used as target collision data, and the airbag controller sends the target collision data.

5. The method according to claim 3, characterized in that: The method further comprises: If the airbag controller loses power or restarts, reading the target collision data stored in the target non-volatile memory and sending the target collision data to the airbag controller; The airbag controller continuously sends target collision data to the vehicle body controller; The vehicle body controller controls the opening of vehicle doors and / or windows according to the target collision data.

6. The method according to claim 2, characterized in that If the vehicle state is a driving state, then after the driving data meets the safety condition, the backup power switch of the backup power supply is controlled to be disconnected, including: If the vehicle state is a driving state, obtaining the vehicle speed; If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed; When the vehicle speed is less than the target vehicle speed and a first period of time has passed, a backup power switch of the backup power supply is controlled to be disconnected.

7. The method according to claim 2, characterized in that If the vehicle state is a driving state, then after the driving data meets the safety condition, the backup power switch of the backup power supply is controlled to be disconnected, including: If the vehicle state is a driving state, obtaining the vehicle speed; If the vehicle speed is greater than or equal to the target vehicle speed, limiting the vehicle speed to below the target vehicle speed; When the vehicle speed is less than the target vehicle speed and within the second time period, if it is detected that the vehicle speed is 0, the backup power switch of the backup power supply is controlled to be disconnected.

8. A backup power supply control device, characterized in that: The vehicle is provided with a power battery, a storage battery, a power battery switch and a backup power switch, wherein the power battery is connected to the power battery switch to provide high voltage power to the vehicle; some of the series-connected cells in the power battery are connected to the backup power switch as a backup power source to replace the storage battery to provide low voltage power to the vehicle; The backup power control device is used to obtain the battery voltage when the battery is supplying power, and when the battery voltage is less than the low voltage threshold, control the backup power switch of the backup power supply to close to replace the battery for supplying power.

9. The device according to claim 8, characterized in that The backup power supply control device comprises: An acquisition module, used for acquiring the battery voltage when the battery is powered; A first control module, configured to obtain a vehicle state when the battery voltage is less than a low voltage threshold, and control a backup power switch of a backup power source to close to replace the battery for power supply; The second control module is used to determine a control power strategy to be executed according to the vehicle state after the backup power switch of the backup power is closed.

10. A vehicle, characterized in that: The vehicle includes a vehicle body and a controller installed in the vehicle body, wherein the controller executes the backup power supply control method described in any one of claims 1-7.

Images