Control method and device of vehicle low-voltage battery loop and medium

Abstract

The invention provides a control method and device for a vehicle low-voltage battery loop and a medium, and belongs to the technical field of vehicles. The method comprises the steps that current operation parameters of a vehicle battery are obtained; according to the current operation parameters, the operation state of the vehicle battery skipping at the next moment is determined; and regulating and controlling a charging module, a discharging module and a voltage reduction conversion module according to the skipping operation state. The charging and discharging process of the lithium battery is optimized, and damage to a battery cell caused by over-charging, over-discharging and large-current impact is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a control method and device for a low-voltage battery loop of a vehicle, and a medium. BACKGROUND

[0002] In the prior art, the traditional lithium battery loop control method is mainly designed for a high-voltage power supply system of a power battery, adopts a relay control scheme, and cannot achieve fine control of the charging and discharging loop. The charging thereof is achieved by a charger, and the entire control process is regulated and controlled by an OBC. However, the low-voltage power supply lithium battery is directly controlled by a vehicle DC / DC module. Considering the working voltage demand of the entire vehicle load, in the case of extreme power loss of the lithium battery, if no charging limitation is performed, the lithium battery may be overcharged, which may cause irreparable damage to the battery cell. SUMMARY

[0003] The main purpose of the embodiments of the present application is to provide a control method and device for a low-voltage battery loop of a vehicle, and a medium, so as to optimize the charging and discharging process of the lithium battery and avoid damage to the battery cell caused by overcharging, overdischarging, and large current impact.

[0004] To achieve the above-mentioned purpose, one aspect of the embodiments of the present application provides a control method for a low-voltage battery loop of a vehicle, which is used for a control system for a low-voltage battery loop of a vehicle. The system includes a battery cell detection module, a discharging module, a charging module, and a step-down conversion module. The battery cell detection module is used for detecting the current operating parameter of the vehicle battery. The discharging module is used for driving the vehicle battery to discharge. The charging module is used for supplying the charging voltage input from the outside to the vehicle battery. The step-down conversion module is used for supplying the charging voltage to the vehicle battery and limiting the charging voltage. The method includes: obtaining the current operating parameter of the vehicle battery; determining the next time jump operating state of the vehicle battery according to the current operating parameter; controlling the charging module, the discharging module, and the step-down conversion module according to the jump operating state.

[0005] Further, the operating state includes a fault state, a normal working state, a power compensation state, and a power locking state. The current operating parameter includes the current battery capacity. The controlling of the charging module, the discharging module, and the step-down conversion module according to the jump operating state includes: determining whether the current battery capacity is less than a first capacity threshold; when the current battery capacity is less than the first capacity threshold, determining that the jump operating state is the power compensation state; generating a power compensation request according to the power compensation state, and sending the power compensation request to a vehicle-mounted control terminal to charge the vehicle battery. driving the charging module and the discharging module to operate, and controlling the step-down conversion module to keep in the closed state until the current battery power is in the set full charging power range.

[0006] Further, the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state comprises: after the power supply request is sent, judging whether the current battery power is lower than a set second power threshold value; when the current battery power is lower than the set second power threshold value, jumping from the power supply state to the power lock state; controlling the charging module and the discharging module to enter the closed state, and driving the step-down conversion module to operate.

[0007] Further, the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state comprises: when the jumping running state is the power lock state, acquiring a supply time length of receiving an externally supplied charging voltage; when the supply time length exceeds a set supply time length, determining that the jumping running state is the power supply state, and jumping from the power lock state to the power supply state; controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0008] Further, the system further comprises a wake-up interface, and the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state comprises: when the jumping running state is the power lock state, acquiring a signal time length of the wake-up interface outputting a low-level signal; when the signal time length exceeds a set signal time length, determining that the jumping running state is the power supply state, and jumping from the power lock state to the power supply state; controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0009] Further, the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state comprises: when the jumping running state is the power supply state, acquiring a current battery power; when the current battery power is in the set full charging power range and the current battery power is higher than a set maximum threshold value in the set full charging power range, jumping from the power supply state to the normal working state; controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0010] Further, the normal working state includes a battery overcharge state, and the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state includes: When it is determined that the jumping running state is the battery overcharge state, the charging module is controlled to enter a closed state, and the step-down conversion module is driven to run.

[0011] Further, the regulating the charging module, the discharging module and the step-down conversion module according to the jumping running state includes: When it is determined that the jumping running state is the fault state, the charging module, the discharging module and the step-down conversion module are all controlled to enter a closed state.

[0012] To achieve the above object, another aspect of the embodiment of the present application provides a vehicle control device, comprising a memory, a processor and a program stored in the memory and executable on the processor, and the program is executed by the processor to implement the control method of the vehicle low-voltage battery loop.

[0013] To achieve the above object, another aspect of the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the control method of the vehicle low-voltage battery loop.

[0014] The embodiment of the present application at least has the following beneficial effects: the present application provides a control method and device of a vehicle low-voltage battery loop, medium, and the scheme defines the running state of the vehicle battery through the current running parameter of the vehicle battery, and the state jumping condition of the vehicle battery in the working process and different scenes and the control strategy of the charging and discharging loop are clear, so as to optimize the charging and discharging process of the vehicle battery and avoid the damage to the battery caused by overcharge, overdischarge and large current impact. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a flow chart of the control method of the vehicle low-voltage battery loop provided by the embodiment of the present application; Figure 2 is a hardware structure frame schematic diagram of the control system of the vehicle low-voltage battery loop provided by the embodiment of the present application. DETAILED DESCRIPTION

[0016] For the purpose of making the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the present application. They are merely examples of apparatuses and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0017] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various concepts, but unless specifically stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, the Ethernet signal information can also be referred to as the interface signal information without departing from the scope of the embodiments of the present application, and similarly, the interface signal information can also be referred to as the Ethernet signal information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determining".

[0018] The terms "at least one", "multiple", "each", "any" and the like used in the present application include one, two or more, multiple includes two or more, and each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0020] Reference Figure 2 A control system of a vehicle low-voltage battery circuit includes a wake-up interface, an external interface, a cell detection module, a discharge module, a charging module, a step-down conversion module, and a control module.

[0021] The control module is connected with the cell detection module, the discharge module, the charging module, and the step-down conversion module, respectively. The wake-up interface is connected with the control module, and the wake-up interface can provide a low-level signal to the control module.

[0022] The control module can be an MCU control chip.

[0023] The cell detection module is connected with the vehicle battery. The cell detection module can detect the current operating parameters of the vehicle battery and send the current operating parameters to the control module.

[0024] The current operation parameters include a current battery power, a current battery temperature, a current battery voltage and a current battery current. The current operation parameters can also include other battery parameters, which are not described in detail in the embodiment.

[0025] The discharge module is connected with the vehicle battery, and the discharge module can drive the vehicle battery to discharge, so that the vehicle battery discharges to the outside.

[0026] The discharge module includes a discharge switch device and a discharge loop, and the discharge switch device is connected with the vehicle battery and the control module respectively. The discharge switch device can control the on-off of the discharge loop, and the vehicle battery cannot provide current and voltage to the outside after the discharge switch device is disconnected.

[0027] The charging module is connected with the vehicle battery, and the charging module can receive the charging voltage supplied from the outside, and supply the charging voltage to the vehicle battery to charge the vehicle battery.

[0028] The charging module includes a charging switch device and a charging loop, and the charging switch device is connected with the external interface, the vehicle battery and the control module respectively. The charging switch device can control the on-off of the charging loop, and the vehicle battery cannot be charged by the outside after the charging switch device is disconnected.

[0029] The voltage reduction conversion module is connected with the external interface and the vehicle battery respectively. The voltage reduction conversion module can receive the charging voltage supplied from the outside, supply the charging voltage to the vehicle battery, and limit the charging voltage to avoid damage to the vehicle battery due to overcharging.

[0030] The charging switch device and the discharge switch device can be MOS tubes, IGBT tubes or relays, and the type of the switch device is not limited in the embodiment.

[0031] In some embodiments of one aspect of the application, the control method of the vehicle low-voltage battery circuit is applied to the control system of the vehicle low-voltage battery circuit, Figure 1 is an optional flowchart of the control method of the vehicle low-voltage battery circuit provided by the embodiment of the application, Figure 1 The method can include but is not limited to steps S100 to S300.

[0032] Step S100, obtaining the current operation parameters of the vehicle battery.

[0033] Step S200, determining the next time jump operation state of the vehicle battery according to the current operation parameters.

[0034] Step S300, regulating and controlling the charging module, the discharge module and the voltage reduction conversion module according to the jump operation state.

[0035] The steps S100 to S300 shown in the embodiments of the present application define the operating state of the vehicle battery through the current operating parameters of the vehicle battery, clearly define the state jump conditions of the vehicle battery in the working process and different scenarios and the control strategy for the charge-discharge circuit, so as to optimize the charge-discharge process of the vehicle battery and avoid damage to the battery cell caused by overcharging, over-discharging and large current impact.

[0036] In some embodiments of S100, the current operating parameters of the vehicle battery are detected by a battery cell detection module.

[0037] The current operating parameters include the current battery capacity, the current battery temperature, the current battery voltage and the current battery current.

[0038] In some embodiments of S200, whether the vehicle battery is in an overvoltage, undervoltage, overcurrent, overtemperature or other situation is determined by the current operating parameters, and the operating state to be jumped to at the next moment is determined by the current situation.

[0039] The operating state includes an initialization state, a normal working state, a power compensation state, a power lock state and a fault state. The normal working state includes a battery overcharging state, a normal battery charging state and a battery voltage too low state.

[0040] The initialization state is that the internal parameters are initialized during the system startup process.

[0041] The power compensation state is that when the current battery capacity is less than a set first capacity threshold, a power compensation request is sent externally to request charging of the vehicle battery to restore the capacity.

[0042] The power lock state is that when the power compensation is not executed and the current battery capacity continues to decrease until it is lower than a set second capacity threshold, the external power supply circuit is disconnected, a small part of the capacity of the vehicle battery is reserved, and the vehicle can be started.

[0043] The fault state is that the vehicle battery has a serious fault, the external power supply is disconnected, and the fault is further expanded.

[0044] In some embodiments of S300, the charge module, the discharge module and the step-down conversion module are regulated by the determined jump operating state, and the charge module, the discharge module and the step-down conversion module are controlled to operate or be turned off.

[0045] That is, the on-off of the charging switch device of the charge module, the on-off of the discharge switch device of the discharge module and the operation or shutdown of the step-down conversion module are controlled by the determined jump operating state.

[0046] In an embodiment of one aspect of the present application, in S300, the regulation process of the charge module, the discharge module and the step-down conversion module includes: S310, determining whether the current battery power is less than the first set power threshold value; S311, when the current battery power is less than the first set power threshold value, determining that the running state of the jump is the power compensation state; S312, generating a power compensation request according to the power compensation state, and sending the power compensation request to the vehicle control terminal to charge the vehicle battery; S313, driving the charging module and the discharging module to operate, and controlling the step-down conversion module to remain in the closed state until the current battery power is in the set full charge power range.

[0047] In the embodiment, when the vehicle battery is in the normal working state, the current detection parameter detected by the cell detection module is used to obtain the current battery power, and it is determined whether the current battery power is less than the first set power threshold value.

[0048] If yes, it is determined that the vehicle battery is insufficient and needs to be compensated, and the running state of the jump is the power compensation state, which jumps from the normal working state to the power compensation state.

[0049] If no, the current vehicle battery is in the normal working state and does not jump.

[0050] In the power compensation state, a power compensation request is generated and sent to the vehicle control terminal, and the vehicle charges the vehicle battery according to the power compensation request. At this time, the charging module and the discharging module are driven to operate, and the step-down conversion module is controlled to remain in the closed state to ensure that the vehicle battery is quickly recovered and charged until the current battery power is in the set full charge power range.

[0051] Specifically, at this time, the discharging switch device is controlled to be closed, the charging switch device is controlled to be closed, and the step-down conversion module is controlled to remain in the closed state until the current battery power is close to full.

[0052] The first set power threshold value can be 60% of the battery power or other battery power, and the first set power threshold value is not limited in the embodiment.

[0053] In the embodiment of one aspect of the application, in S300, the charging module, the discharging module and the step-down conversion module control process includes: S320, when the running state of the jump is the power compensation state, obtaining the current battery power; S321, when the current battery power is in the set full charge power range and the current battery power is higher than the set maximum threshold value in the set full charge power range, jumping from the power compensation state to the normal working state; S322, controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0054] In the embodiment, when the running state of the jump is the power compensation state, the current battery capacity of the vehicle battery being charged is detected.

[0055] If the current battery capacity is within the set full charge capacity range, close to full, it is determined whether the current battery capacity is higher than the set maximum threshold value in the range; If yes, it is determined that the vehicle battery is close to full, the vehicle battery is prevented from overcharging, and the running state of the vehicle battery jumps from the power compensation state to the normal working state. At this time, the charging module, the discharging module and the step-down conversion module are all in the closed state.

[0056] That is, when the current running state is the power compensation state, and the current battery capacity of the vehicle battery is higher than the set maximum threshold value, the running state is switched from the power compensation state back to the normal working state. At this time, the discharging switching device, the charging switching device and the step-down conversion module are all closed.

[0057] The set full charge capacity range can be a capacity range of 96% to 98%, or other capacity ranges. In the embodiment, the set full charge capacity range is not limited.

[0058] In the embodiment of one aspect of the application, in S300, the charging module, the discharging module and the step-down conversion module control process includes: S330, after the power compensation request is sent, it is determined whether the current battery capacity is lower than the set second capacity threshold value; S331, when the current battery capacity is lower than the set second capacity threshold value, the running state jumps from the power compensation state to the power lock state; S332, control the charging module and the discharging module to be in the closed state, and drive the step-down conversion module to run.

[0059] In the embodiment, after entering the power compensation state and the power compensation request is sent, it is determined whether the current battery capacity is lower than the set second capacity threshold value. If yes, it is considered that the power compensation function is invalid, which causes the battery capacity to further decrease, and the vehicle battery jumps from the power compensation state to the power lock state. At this time, the charging module and the discharging module are controlled to be in the closed state, the step-down conversion module is driven to run, and small current charging is allowed in the extremely low capacity state to protect the battery cell.

[0060] That is, when the power compensation function is invalid, the battery capacity further decreases to the set second capacity threshold value, the vehicle battery jumps from the power compensation state to the power lock state, the discharging switching device is controlled to be open, the charging switching device is controlled to be open, the vehicle battery is prevented from further discharging, and the step-down conversion module is controlled to be open, allowing small current charging in the extremely low capacity state to protect the battery cell.

[0061] The second power threshold can be 20% of the battery power, or other battery power, and is not limited in the embodiment.

[0062] In the embodiment of the aspect of the application, in S300, the regulation process of the charging module, the discharging module and the step-down conversion module comprises: S340, when the running state of the jump is the lock power state, detecting the supply duration of the charging voltage supplied by the external supply; S341, when the supply duration exceeds the set supply duration, it is determined that the running state of the jump is the power compensation state, and the lock power state jumps to the power compensation state; S342, controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0063] In the embodiment, if the running state of the jump is the lock power state, that is, the current running state is the lock power state, the supply duration of the charging voltage is detected, and it is judged whether the supply duration exceeds the set supply duration.

[0064] In the lock power state, when the detected supply duration exceeds the set supply duration, it is considered that the external continuous charging exceeds a certain time, and it is determined that the running state of the jump is the power compensation state, and the vehicle battery jumps from the lock power state to the power compensation state. At this time, the charging module, the discharging module and the step-down conversion module are controlled to enter the closed state. That is, in the lock power state, the external continuous charging exceeds a certain time, and the vehicle battery reenters the power compensation state, at which time the discharging switch device is controlled to be closed, the charging switch device is controlled to be closed, and the step-down conversion module is controlled to be closed.

[0065] The set supply duration can be adjusted according to actual application, and is not limited in the embodiment.

[0066] In the embodiment of the aspect of the application, in S300, the regulation process of the charging module, the discharging module and the step-down conversion module comprises: S350, when the running state of the jump is the lock power state, detecting the signal duration of the low-level signal output by the wake-up interface; S351, when the signal duration exceeds the set signal duration, it is determined that the running state of the jump is the power compensation state, and the lock power state jumps to the power compensation state; S352, controlling the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0067] In the embodiment, if the running state of the jump is the lock power state, that is, the current running state is the lock power state, the signal duration of the low-level signal output by the wake-up interface is detected, and it is judged whether the signal duration exceeds the set supply duration.

[0068] In the lock power state, when the detected power supply duration exceeds the set supply duration, it is considered that the external continuous charging exceeds a certain time, and the running state of the jump is determined to be the power compensation state, and the vehicle battery jumps from the lock power state to the power compensation state. At this time, control the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0069] That is, in the lock power state, the low-level signal is continuously provided through the wake-up interface for more than a certain time, and the vehicle battery reenters the power compensation state, at which time the discharging switch device is controlled to be closed, the charging switch device is controlled to be closed, and the step-down conversion module is controlled to be closed.

[0070] In an embodiment of one aspect of the present application, in S300, the charging module, the discharging module and the step-down conversion module regulation process includes: S360, when it is determined that the running state of the jump is the fault state, control the charging module, the discharging module and the step-down conversion module to enter the closed state.

[0071] In this embodiment, when the current running parameters determine that the current vehicle battery has over-temperature, over-voltage or over-current conditions, the running state of the jump is determined to be the fault state, and the normal working state jumps to the fault state. When it is determined that the running state of the jump is the fault state, the charging module, the discharging module and the step-down conversion module are controlled to enter the closed state.

[0072] That is, when the vehicle battery has a serious fault, such as over-temperature, over-voltage, over-current, etc., in order to avoid battery damage and thermal runaway and other serious consequences, it is necessary to cut off the power supply circuit of the vehicle battery, and the normal working state jumps to the fault state. At this time, the discharging switch device is controlled to be closed, the charging switch device is controlled to be closed, and the step-down conversion module is controlled to be closed.

[0073] In the fault state, when the vehicle battery serious fault disappears, it recovers from the fault state to the normal working state, and needs to control the discharging switch device to be closed, the charging switch device to be closed, and the step-down conversion module to be closed.

[0074] In an embodiment of one aspect of the present application, in S300, the charging module, the discharging module and the step-down conversion module regulation process includes: S370, when it is determined that the running state of the jump is the battery overcharging state, control the charging module to enter the closed state and drive the step-down conversion module to operate.

[0075] In the embodiment, after the internal parameter initialization is completed in the system startup process, the running state of the jump is determined as the normal working state according to the current running parameter after the initialization is completed, and the jump is made from the initialization state to the normal working state. The normal working state includes the battery overcharge state, the battery normal charging state and the battery voltage too low state. That is, the jump is made from the initialization state to the battery normal charging state.

[0076] In the battery normal charging state, the charging module, the discharging module and the step-down conversion module are all controlled to enter the closed state, that is, the discharging switch device is closed, the charging switch device is closed and the step-down conversion module is controlled to be closed.

[0077] The current battery voltage is obtained through the current running parameter. If the current battery voltage is greater than the set overcharge voltage threshold, it is considered that the current vehicle battery voltage is too high due to abnormal charging, and the running state of the jump is determined as the battery overcharge state, and the jump is made from the battery normal charging state to the battery overcharge state. In order to avoid damage and even fire of the vehicle battery due to continuous overcharge, the charging module is controlled to enter the closed state, the step-down conversion module is driven to operate, and the battery is allowed to be charged with small current after being stepped down by the step-down conversion module.

[0078] That is, when the current vehicle battery voltage is too high due to abnormal charging, the discharging switch device is closed, the charging switch device is opened and the step-down conversion module is controlled to be opened, and the battery is allowed to be charged with small current after being stepped down by the step-down conversion module.

[0079] In another embodiment, the current battery voltage is obtained through the current running parameter. If the current battery voltage is less than the set low voltage threshold, it is considered that the current vehicle battery voltage is too low due to abnormal charging, and the running state of the jump is determined as the battery overcharge state, and the jump is made from the battery normal charging state to the battery voltage too low state. In order to avoid damage of the battery due to continuous discharge, the discharging switch device is opened, the charging switch device is closed and the step-down conversion module is controlled to be closed.

[0080] The set low voltage threshold and the set overcharge voltage threshold can be set according to actual needs, and in the embodiment, no specific limitation is made thereto.

[0081] Another aspect of the embodiment of the application also provides a vehicle control device. The vehicle control device includes a memory and a processor. The memory stores a computer program, and the processor implements the control method of the vehicle low-voltage battery loop when executing the computer program. The vehicle control device can be any intelligent terminal including a tablet computer, a vehicle-mounted computer and the like.

[0082] It can be understood that the contents in the above method embodiments are all applicable to the device embodiments, the device embodiments specifically implement the functions of the above method embodiments, and achieve the same beneficial effects as the above method embodiments.

[0083] In an embodiment, the vehicle control device comprises: The processor can be implemented in a manner of a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, and is configured to execute related programs to implement the technical solutions provided by the embodiments of the present application. The memory can be implemented in a form of a ROM (ReadOnly Memory), a static storage device, a dynamic storage device, or a RAM (Random Access Memory). The memory can store an operating system and other application programs. When the technical solutions provided by the embodiments of the present application are implemented by software or firmware, the related program codes are stored in the memory and are called and executed by the processor to implement the vehicle low-voltage battery loop control method of the embodiments of the present application. The input / output interface is configured to implement information input and output. The communication interface is configured to implement communication interaction between the device and other devices. The communication can be implemented in a wired manner (for example, a USB, a network cable, etc.) or in a wireless manner (for example, a mobile network, WIFI, Bluetooth, etc.). The bus is configured to transmit information between various components (for example, the processor, the memory, the input / output interface, and the communication interface) of the device. The processor, the memory, the input / output interface, and the communication interface are connected to each other in the device through the bus.

[0084] The embodiments of the present application also provide a vehicle comprising the vehicle low-voltage battery loop control method of the above embodiments.

[0085] The vehicle can be a private car, such as a sedan, an SUV, an MPV, or a pickup truck, etc. The vehicle can also be an operating vehicle, such as a van, a bus, a small truck, or a large trailer, etc. The vehicle needs to have an electric motor that can output power or store mechanical energy as a generator. When the vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0086] Since the vehicle applies all the technical solutions of the above vehicle control device, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0087] Another aspect of the present application provides a computer readable storage medium storing a computer program, which, when executed by a processor, implements the method for controlling a low-voltage battery circuit of a vehicle.

[0088] It can be understood that the above-mentioned method embodiments are applicable to the present storage medium embodiment, and the present storage medium embodiment specifically implements the same functions and achieves the same beneficial effects as the above-mentioned method embodiments.

[0089] The memory, as a non-transitory computer readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory remotely arranged with respect to the processor, and these remote memories can be connected to the processor through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0090] The embodiments described in the present application are used to more clearly illustrate the technical solutions of the present application, and do not constitute a limitation on the technical solutions provided by the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the present application are also applicable to similar technical problems.

[0091] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the present application, and can include more or fewer steps than shown in the figures, or combine certain steps or different steps.

[0092] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separate, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0093] Those skilled in the art can understand that all or some of the steps in the above-mentioned method, the functions of the modules / units in the system and the device can be implemented as software, firmware, hardware and their appropriate combinations.

[0094] The terms "first", "second", "third", "fourth" and the like in the description of this application and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover the embodiments of this application in any order. Furthermore, the terms "comprising", "having", "including", and "containing" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises, has, includes or contains a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, system, product or apparatus.

[0095] It should be understood that, in this application, "at least one" means one or more, "multiple" means two or more. "And / or" is used to describe the relationship between the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases: only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0096] The units described above as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0097] In addition, the functional units in each embodiment of the application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0098] The preferred embodiments of the application are described above with reference to the accompanying drawings, and the scope of the application is not limited by this. Any modifications, equivalent replacements and improvements made by those skilled in the art without departing from the scope and essence of the application shall be within the scope of the application.

Claims

1. A method for controlling a vehicle low-voltage battery circuit, characterized in that: A control system for a vehicle low-voltage battery circuit, the system comprising a cell detection module, a discharge module, a charging module, and a step-down conversion module; the cell detection module is used to detect the current operating parameters of the vehicle battery; the discharge module is used to drive the vehicle battery to discharge; and the charging module is used to supply an external input charging voltage to the vehicle battery; The step-down conversion module is used to supply the charging voltage to the vehicle battery and limit the charging voltage; The method comprises: Get the current operating parameters of the vehicle battery; Determining the next operating state of the vehicle battery to be jumped to based on the current operating parameters; According to the jump operation state, the charging module, the discharging module and the step-down conversion module are regulated.

2. The method according to claim 1, characterized in that The operating state includes a fault state, a normal operating state, a charging state, and a locked state. The current operating parameter includes the current battery power. The control of the charging module, the discharging module, and the step-down conversion module according to the jump operating state includes: Determining whether the current battery power is less than a set first power threshold; When the current battery power is less than the set first power threshold, determining that the jump operation state is a charging state; generating a charging request according to the charging status, and sending the charging request to the vehicle control terminal to charge the vehicle battery; The charging module and the discharging module are driven to operate, and the buck conversion module is controlled to remain in a closed state until the current battery power level is within the set full charge range.

3. The method according to claim 2, characterized in that The step of regulating the charging module, the discharging module, and the step-down conversion module according to the jump operation state includes: After the recharging request is sent, determining whether the current battery power level is lower than a set second power threshold; When the current battery power level is lower than the set second power threshold, the battery state is switched from the charging state to the locking state; The charging module and the discharging module are controlled to enter a closed state, and the buck conversion module is driven to operate.

4. The method according to claim 2, characterized in that The step of regulating the charging module, the discharging module, and the step-down conversion module according to the jump operation state includes: When the jump operation state is the power-lock state, obtaining the supply time length of the externally supplied charging voltage; When the supply time exceeds the set supply time, the jump operation state is determined to be the power replenishment state, and the state is jumped from the power lock state to the power replenishment state; The charging module, the discharging module and the step-down conversion module are controlled to enter a closed state.

5. The method according to claim 2, characterized in that The system further includes a wake-up interface, and the charging module, the discharging module and the buck conversion module are regulated according to the jump operation state, including: When the jump running state is the power-lock state, obtaining the signal duration of the wake-up interface outputting a low-level signal; When the signal duration exceeds the set signal duration, the jump operation state is determined to be the power replenishment state, and the state is jumped from the power lock state to the power replenishment state; The charging module, the discharging module and the step-down conversion module are controlled to enter a closed state.

6. The method according to claim 2, characterized in that The step of regulating the charging module, the discharging module, and the step-down conversion module according to the jump operation state includes: When the jump operation state is the charging state, obtaining the current battery power; When the current battery power level is within the set full charge range and the current battery power level is higher than the set maximum threshold within the set full charge range, switching from the charging state to the normal working state; The charging module, the discharging module and the step-down conversion module are controlled to enter a closed state.

7. The method according to claim 2, characterized in that The normal operating state includes a battery overcharge state, and the regulating and controlling of the charging module, the discharging module, and the step-down conversion module according to the jump operating state includes: When it is determined that the jump operation state is the battery overcharge state, the charging module is controlled to enter the closed state, and the buck conversion module is driven to operate.

8. The method according to claim 2, characterized in that The step of regulating the charging module, the discharging module, and the step-down conversion module according to the jump operation state includes: When it is determined that the jump operation state is the fault state, the charging module, the discharging module and the buck conversion module are all controlled to enter a closed state.

9. A vehicle control device, characterized in that: It comprises a memory, a processor and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the control method for the vehicle low-voltage battery circuit according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control method for a vehicle low-voltage battery circuit according to any one of claims 1 to 8 is implemented.

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