CN111516497B

CN111516497B - Load control method and circuit, battery management system and vehicle

Info

Publication number: CN111516497B
Application number: CN202010357338.8A
Authority: CN
Inventors: 骆会秀; 傅焱辉; 娄其栋
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2024-04-19
Anticipated expiration: 2040-04-29
Also published as: CN118061790A; CN111516497A

Abstract

The embodiment of the invention relates to the technical field of circuits, and discloses a load control method and circuit, a battery management system and a vehicle. The load control method comprises the following steps: the load control device controls the switch of the load unit to be turned on according to a driving signal output by the controller, wherein the driving signal is a signal generated by the controller based on a load working instruction; according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy; when the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on. According to the invention, the load is kept in a working state, unexpected power failure caused by unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset of the controller, and the safety is improved.

Description

Load control method and circuit, battery management system and vehicle

Technical Field

The embodiment of the invention relates to the technical field of circuits, in particular to a load control method and circuit, a battery management system and a vehicle.

Background

With the development of battery technology, electric vehicles have become a development trend of the automobile industry instead of fuel vehicles. In electric vehicles, high-power switching devices, such as relays, contactors, and loads, are used, which are important for the safe operation of the whole vehicle. Due to the fact that the driving environment is complex and the service life of the load is prolonged, the devices can fail, and a large potential safety hazard exists.

The inventor finds that at least the following problems exist in the prior art: when the MCU is in unexpected reset, unexpected power failure of the load can be caused, so that the electric automobile suddenly loses power, and the safety of personnel on the automobile is affected.

Disclosure of Invention

The embodiment of the invention aims to provide a load control method and circuit, a battery management system and a vehicle, so that a load is kept in a working state, unexpected power failure caused by unexpected reset of a controller is avoided, the load is ensured to be kept in the working state during the unexpected reset of the controller, and the safety is improved.

In order to solve the above technical problems, an embodiment of the present invention provides a load control method, including: the load control device controls the switch of the load unit to be turned on according to a driving signal output by the controller, wherein the driving signal is a signal generated by the controller based on a load working instruction; according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy; when the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

Embodiments of the present invention provide a load control circuit including: a controller and a load control device connected to each other; the controller is used for generating a driving signal based on the load working instruction; the load control device is used for controlling the energy storage capacitor of the load control device to store energy according to the driving signal; the load control device is also used for controlling the energy storage capacitor to discharge in a first time period when the driving signal is in a high-resistance state, so that the switch of the load unit is kept on.

The embodiment of the invention also provides a battery management system which comprises the load control circuit.

The embodiment of the invention also provides a vehicle comprising the battery management system.

Compared with the prior art, the embodiment of the invention has the advantages that when the load control device receives a signal generated by the controller based on the load working instruction, the switch of the load unit is controlled to be turned on, so that the load in the load unit enters a working state, meanwhile, the load control device also controls the energy storage capacitor to be charged, when the controller is in an unexpected reset state, the driving signal is changed into a high-resistance state, at the moment, the load control device controls the energy storage capacitor to be discharged, so that the switch of the load unit is kept on, namely, the load is kept in the working state, unexpected power failure caused by unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset period of the controller, and the safety is improved.

In addition, the load control device controls the switch of the load unit to be turned off after the first period. In this embodiment, when the load is in the working state, if unexpected reset occurs in the controller, the load can be set to maintain the working state only during the reset period of the controller, and if the reset period has elapsed, the controller is not completed yet, which indicates that the controller fails, and at this time, the load can be disconnected in time, so that the load enters the non-working state.

In addition, the driving signal includes a first driving signal and a second driving signal, and according to the driving signal, the load control device controls the energy storage capacitor of the load control device to store energy, including: when the first driving signal is at a high level, a delay circuit in the load control device controls the energy storage capacitor to store energy; when the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on, and the load control device comprises: when the first driving signal is in a high-resistance state, the delay circuit controls the energy storage capacitor to discharge, and a logic circuit in the load control device controls a switch of the load unit to be kept on; the load control device controls the switch of the load unit to be opened after a first time period, and the load control device comprises: according to the second driving signal, a timing circuit in the load control device controls the energy storage capacitor to stop discharging after the first time period, and a logic circuit controls the switch of the load unit to be turned off. The present embodiment provides a specific structure of the load control device.

In addition, the load control device controls the switch of the load unit to be turned off according to a third driving signal output by the controller, wherein the third driving signal is a signal generated by the controller based on a load turn-off command. In the present embodiment, when the load is in the non-operating state, if the controller is unexpectedly reset, the load can be kept in the non-operating state.

In addition, when the functional safety signal output by the functional safety circuit is received, the load control device controls the switch of the load unit to be disconnected, and the functional safety signal represents that the controller or the functional unit connected with the controller fails. In this embodiment, when the controller or the preset control unit fails, the load can be disconnected in time through the functional safety circuit, so that safety is ensured.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic diagram of a load control circuit according to a first embodiment of the present invention;

fig. 2 is a specific flowchart of a load control method according to a first embodiment of the present invention;

fig. 3 is a schematic diagram of a load control circuit according to a first embodiment of the present invention, wherein a load control device is connected to both a high side control circuit and a low side control circuit;

Fig. 4 is a schematic diagram of a load control circuit according to a first embodiment of the present invention, wherein two load control devices are connected to a high side control circuit and a low side control circuit, respectively;

Fig. 5 is a schematic diagram of a load control circuit according to a second embodiment of the present invention;

fig. 6 is a specific flowchart of a load control method according to a second embodiment of the present invention;

FIG. 7 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the load control circuit further comprises a functional safety circuit;

Fig. 8 is a specific structural diagram of a load control circuit according to a second embodiment of the present invention;

Fig. 9 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the sixth resistor is a pull-up resistor;

FIG. 10 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the sixth resistor is a pull-down resistor;

Fig. 11 is a schematic view of a battery management system according to a fourth embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. The claimed application may be practiced without these specific details and with various changes and modifications based on the following embodiments.

The first embodiment of the present invention relates to a load control method applied to a Battery Management System (BMS) of an electric vehicle, which can maintain a load, such as a relay, a water pump, a valve, etc., in an operating state when an unexpected reset occurs in a controller MCU in the Battery management system.

The load control circuit to which the load control method of the present embodiment is applied is described below.

Referring to fig. 1, the load control circuit includes: a switch interconnecting the controller 1 and the load control device 2, the load control device 2 being connected to the load unit 3, the load unit 3 comprising, illustratively, a driving power supply 31, a high-side control circuit 32, a load 33, and a low-side control circuit 34 connected in sequence, the low-side control circuit 34 being connected to a reference potential bit (reference potential bit is taken as reference ground GND in the figure as an example); in this case, the switches of the load unit 3 are the high-side control circuit 32 and the low-side control circuit 34, and the load control device 2 is connected to the high-side control circuit 32 and/or the low-side control circuit 34, and in this embodiment and the following embodiments, the load control device 2 is only connected to the high-side control circuit 32.

A specific flow of the load control method of the present embodiment is shown in fig. 2.

Step 101, according to a driving signal output by the controller, the load control device controls the switch of the load unit to be turned on, wherein the driving signal is a signal generated by the controller based on a load working instruction.

Step 102, according to the driving signal, the load control device controls the energy storage capacitor of the load control device to store energy.

And 103, when the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

Specifically, when the controller 1 receives a load operation command, a corresponding driving signal is generated and input to the load control device 2, at this time, the load control device 2 controls the high-side control circuit 32 in the load unit 3 to be turned on, the low-side control circuit 34 keeps on, the driving power supply 31 supplies power to the load 33, the load 33 enters an operating state, and meanwhile, the load control device 2 controls the energy storage capacitor therein to be charged.

When the controller 1 is in an unexpected reset state, when the driving signal changes to a high-resistance state during the reset period of the controller 1, at this time, the reset time of the controller 1 is a first preset time period, and the load control device 2 controls the energy storage capacitor to discharge in the first preset time period, so that the high-side control circuit 32 is kept on, that is, the load 33 is still kept in a working state during the first preset time period when the controller 1 is in an unexpected reset, the unexpected power failure caused by the unexpected reset of the controller 1 is avoided, and the electric vehicle is ensured to still safely run during the unexpected reset period of the controller 1. In one example, the load control device 2 controls the switch of the load unit 3 to be turned off after the first period of time, that is, after the first preset period of time elapses, if the driving signal is still in the high-resistance state, which means that the controller 1 does not complete the reset within the first preset period of time, it is determined that the controller 1 fails, and at this time, the load control device 2 controls the energy storage capacitor to stop discharging, so that the high-side control circuit 32 is turned off, and the load 33 enters the non-working state.

It should be noted that, in the present embodiment, the load control device is only connected to the high-side control circuit 32, but not limited thereto, and referring to fig. 3, the load control device 2 may be connected to both the high-side control circuit 32 and the low-side control circuit 34; alternatively, referring to fig. 4, the load control circuit may include 2 load control devices 2, and the two load control devices 2 respectively control the high-side control circuit 32 and the low-side control circuit 34. The operation of the load control circuits in fig. 3 and 4 is the same as that described above, and will not be repeated here.

Compared with the prior art, when the load control device receives a signal generated by the controller based on a load working instruction, the switch of the load unit is controlled to be turned on, so that the load in the load unit enters a working state, meanwhile, the load control device also controls the energy storage capacitor to be charged, when the controller is in an unexpected reset state, the driving signal is changed into a high-resistance state, at the moment, the load control device controls the energy storage capacitor to be discharged, so that the switch of the load unit is kept on, namely, the load is kept in the working state, unexpected power failure caused by unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset period of the controller, and the safety is improved.

A second embodiment of the present invention relates to a load control method, and referring to fig. 5, in a load control circuit to which the load control method of the present embodiment is applied, a load control device 2 includes a delay circuit 21, a timer circuit 22, and a logic circuit 23 connected to each other. The controller 1 is respectively connected to the delay circuit 21 and the timing circuit 22, the delay circuit 21 is respectively connected to the timing circuit 22 and the logic circuit 23, the logic circuit 23 is connected to the high-side control circuit 32, the driving signals comprise a first driving signal and a second driving signal, the controller 1 outputs the first driving signal to the delay circuit 21, and the controller 1 outputs the second driving signal to the timing circuit 22.

A specific flow of the load control method of the present embodiment is shown in fig. 6.

In step 201, the load control device controls the switch of the load unit to be turned on according to a driving signal output by the controller, where the driving signal is a signal generated by the controller based on a load working instruction.

Step 202, when the first driving signal is at a high level, a delay circuit in the load control device controls the energy storage capacitor to store energy.

In step 203, when the first driving signal is in the high-resistance state, the delay circuit controls the energy storage capacitor to discharge, and controls the switch of the load unit to keep on through the logic circuit in the load control device.

And 204, according to the second driving signal, the timing circuit in the load control device controls the energy storage capacitor to stop discharging after the first time period, and controls the switch of the load unit to be turned off through the logic circuit.

Specifically, when the controller 1 receives a load operation command, it outputs a high-level first driving signal to the delay circuit 21, and when the first driving signal is high, the delay circuit 21 outputs a high-level delay signal to the logic circuit 23, and the logic circuit 23 outputs a high-level load control signal to the high-side control circuit 32, so that the high-side control circuit 32 is in a conductive state, and the load 33 is put into an operation state. And the delay circuit 21 controls the charging of the energy storage capacitor when the first driving signal is at a high level.

When the controller 1 is unexpectedly reset, the delay circuit 21 controls the storage capacitor to discharge when the first driving signal is changed from the high level to the high resistance state, the delay circuit 21 still outputs the high level delay signal to the logic circuit 23, the logic circuit 23 keeps outputting the high level load control signal to the high side control circuit 32, so that the high side control circuit 32 keeps on state, and the load 33 keeps working state.

When the controller 1 does not expect the reset, the controller outputs the second driving signal to the timing circuit 22 at the same time, the timing circuit 22 starts to count after receiving the second driving signal, and when the count reaches the first preset time period, the energy storage capacitor is controlled to stop discharging, at this time, if the controller 1 finishes the reset, the first driving signal is converted into a high level, and the load 33 can still keep the working state; if the controller 1 is not reset, the first driving signal is still in the high-resistance state, and the timing circuit 22 controls the energy storage capacitor to stop discharging, so that the high-side control circuit 32 is disconnected, and the load 33 enters the non-working state.

In this embodiment, when the load 33 is in the non-operating state, the operation procedure when the controller 1 is unexpectedly reset is as follows:

when the controller 1 does not receive the load operation command, it can output the low-level first driving signal to the delay circuit 21, at this time, the delay circuit 21 outputs the low-level delay signal to the logic circuit 23, the logic circuit 23 outputs the low-level load control signal to the high-side control circuit 32 to disconnect the high-side control circuit 32, at this time, the connection between the load 33 and the driving power supply 4 is also disconnected, the load 33 is disconnected, and the non-working state is entered.

When the load 33 is in the non-working state, if the controller 1 is undesirably reset, the controller 1 still outputs the first driving signal to the delay circuit 21 to enter the high-resistance state, and since the energy storage capacitor in the delay circuit 21 is not charged, the delay circuit 21 continues to output the low-level delay signal to the logic circuit 23, the logic circuit 23 continues to output the low-level load control signal to the high-side control circuit 32, and the high-side control circuit 32 is kept off, so that the load 33 is still in the non-working state and cannot be turned on by mistake.

In one example, referring to fig. 7, the load control circuit further includes a functional safety circuit 4.

The output end of the functional safety circuit 4 is connected to the logic circuit 23, and the two input ends of the functional safety circuit 4 are respectively connected to the controller 1 and the preset control unit 5. The preset control unit 5 is, for example, a power control unit in the BMS system. It should be noted that, in the present embodiment, the functional safety circuit 4 may be connected to only one of the controller 1 and the preset control unit 5.

The functional safety circuit 4 is configured to output a functional safety signal to the logic circuit 23 in the load control device 2 upon receiving a status signal indicative of a failure, which is derived from the output of the controller 1 or the preset control unit 5. The functional safety circuit 4 may be an exclusive or gate, and when the controller 1 or the preset control unit 5 detects a fault or generates a fault on its own, a status signal indicating that the fault occurs is output to the functional safety circuit 4, and the functional safety circuit 4 outputs a functional safety signal to the logic circuit 23, where the functional safety signal is, for example, a low level signal.

The logic circuit 23 is configured to output a low-level load control signal to the high-side control circuit 32 when receiving the functional safety signal, so as to disconnect the high-side control circuit 32 and make the load 33 enter a non-operating state.

Referring to fig. 8, a specific structure of a load control circuit is shown, and the load control method of the present embodiment is described below with reference to the load control circuit of fig. 8.

In this embodiment, the delay circuit 21 includes a first switch module K1, a first resistor R1, and an energy storage capacitor C; the timing circuit 22 includes a timer 221, a second switch module K2, and a second resistor R2; the logic circuit 23 includes an AND gate AND, a third resistor R3, AND a fourth resistor R4.

The controller 1 is connected to a control end of the first switch module K1, one end of the first switch module K1 is connected to the first power supply V1, the other end of the first switch module K1 is connected to one end of the energy storage capacitor C through the first resistor R1, the other end of the energy storage capacitor C is connected to a reference potential bit (in the figure, the reference potential bit is taken as a reference ground GND as an example), and a connection point P between the first resistor R1 and the energy storage capacitor C is connected to the logic circuit 23. The power supply end of the timer 221 is connected to the second power supply V2, the input end of the timer 221 is connected to the controller 1, the output end of the timer 221 is connected to the control end of the second switch module K2, the first end of the second switch module K2 is connected to a reference potential (in the figure, the reference potential is taken as the ground GND as an example), and the junction P of the first resistor R1 and the energy storage capacitor C is connected to the second end of the second switch module K2. Taking the reference potential bit as the same reference ground GND as an example.

The power supply end of the AND circuit AND is connected to the third power supply V3, the junction P between the first resistor R1 AND the storage capacitor C in the delay circuit 21 is connected to the first input end of the AND circuit AND, the controller 1 is connected to the second input end of the AND circuit AND through the third resistor R3, the output end of the AND circuit AND is connected to the high-side control circuit 32, AND the junction Q between the third resistor R3 AND the AND circuit AND is connected to the fourth power supply V4 through the fourth resistor R4. Wherein the third resistor R3 is a current limiting resistor.

The controller 1 can output a first driving signal to the control end of the first switch module K1, where the first switch module K1 is turned on when the received first driving signal is at a high level, and turned off when the received first driving signal is at a high resistance state. It should be noted that, in this embodiment, the first driving signal may also be set to be a PWM signal with a certain frequency and a certain duty ratio to control the first switch module K1 to be turned on; the first driving signal is set to be a low level signal to control the first switch module K1 to be turned off.

In one example, the logic circuit 23 further includes a third switching module K3, the power supply terminal of the AND circuit AND is connected to the fourth power supply V4 through the third switching module K3, AND the controller 1 is further connected to the control terminal of the third switching module K3.

In this embodiment, the capacitance value of the storage capacitor C may be set according to the time for the controller 1 to reset normally, and the discharging time of the storage capacitor C is longer than the reset time (the first preset time period) of the controller 1 during the reset period of the controller 1.

When unexpected reset occurs, the controller 1 outputs a second driving signal for triggering the timer 221 to work to the timer 221, when the timer 221 receives the second driving signal, the timer 221 starts to count, and when counting to a second preset time period, controls the second switch module K2 to be closed, namely, sends a trigger signal to enable the second switch module K2 to be closed, and at the moment, the energy storage capacitor C rapidly discharges energy through the second resistor R2, so that a high-level delay control signal is not output to the logic circuit 23 any more. The second driving signal is used to trigger the timer 221 to operate, and may be a falling edge generated when the controller 1 is reset.

The controller 1 is further configured to control the third switch module K3 to be turned off when receiving a load off command, so as to cut off power supply to the AND circuit AND, so that the AND circuit AND outputs a low-level load control signal to the high-side control circuit 32, AND disconnect the high-side control circuit 32, so that the load 33 is powered off AND enters a non-working state.

The load control circuit of the present embodiment operates as follows from the time when the controller 1 receives a load operation instruction to the time when unexpected reset occurs:

When receiving the load operation command, the controller 1 outputs a high-level first driving signal to the first switch module K1, so that the first switch module K1 is closed, AND at this time, the high-level first driving signal is output to the AND gate circuit AND through the first switch module K1 AND the first resistor R1, AND the AND gate circuit AND at this time, outputs a high-level load control signal to the high-side control circuit 32, AND the high-side control circuit 32 is turned on, so that the load 33 is put into an operating state. Meanwhile, when the first switch module K1 is closed, the first power source V1 also charges the energy storage capacitor C.

When the controller 1 is unexpectedly reset, the controller 1 outputs a first driving signal to be in a high-resistance state, AND outputs a second driving signal in a second state to the timer 221, at this time, the timer 221 starts to count, before the count reaches a first preset period, the controller 1 is in a reset period, the first switch module K1 receives the first driving signal to be in the high-resistance state, so that the first switch module K1 is turned off, at this time, the energy storage capacitor C starts to discharge, AND outputs the first driving signal in a high level to the AND gate circuit AND, the AND gate circuit AND keeps outputting the load control signal in a high level, the high-side control circuit 32 keeps on, AND the load 33 keeps in an operating state.

If the controller 1 resets the timer 221 before the timer 221 reaches the first preset period, the controller 1 outputs the first driving signal with the high level to the first switch module K1 to keep the load 33 in the working state, and outputs a reset signal to the timer 221 to reset the timer 221 to stop the timer.

If the timer 221 is still not reset to the first preset time period, it is indicated that the controller 1 may fail, AND at this time, the timer 221 sends a trigger signal to close the second switch module K2, the energy of the storage capacitor C is rapidly discharged through the second resistor R2, the high-level first driving signal is not output to the logic circuit 23, the low-level delay signal is output to the AND gate circuit AND, the AND gate circuit AND outputs the low-level load control signal to the high-side control circuit 32, the high-side control circuit 32 is turned off, AND the load 33 is put into a non-working state.

In this embodiment, if the controller 1 receives the load off command when the load 33 is in the working state, the load 33 needs to be turned off by a delay time T1, the delay time T1 is smaller than the timing time T2 of the timer 221, AND if the controller 1 generates an unexpected reset period (the reset time of the controller 1 is represented by T3, T3 < T2), the delay circuit 21 still outputs a high-level delay control signal, which can cause the load 33 to malfunction in the (T2-T1) time, AND the load 33 may be damaged when the load is turned off when the load is reached to T1.

In one example, the logic circuit 23 further includes a fifth resistor R5 and a sixth resistor R6, where the fifth resistor R5 is a current limiting resistor, and the sixth resistor R6 may be configured as a pull-up resistor or a pull-down resistor. Referring to fig. 9, the sixth resistor R6 is a pull-up resistor, and the controller 1 outputs a low level signal to control the third switch K3 to be turned on, outputs a high level signal or enters a high resistance state to control the third switch K3 to be turned off. Referring to fig. 10, the sixth resistor R6 is a pull-down resistor, and the controller 1 outputs a high level signal or enters a high resistance state to control the third switch K3 to be turned on, and outputs a low level signal to control the third switch K3 to be turned off.

A third embodiment of the present invention relates to a load control circuit, referring to fig. 1, the load control circuit includes: the controller 1 and the load control device 2 are connected to each other, and the specific content is referred to the first embodiment and is not described herein.

The controller 1 is configured to generate a drive signal based on a load operation instruction.

The load control device 2 is used for controlling the energy storage capacitor of the load control device 2 to store energy according to the driving signal.

The load control device 2 is further configured to control the energy storage capacitor to discharge in a first period of time when the driving signal is in a high-resistance state, so that the switch of the load unit is kept on.

The load control circuit in this embodiment corresponds to the load control methods in the first embodiment and the second embodiment, that is, the load control circuits in the method embodiments described above may be used in this embodiment, and will not be described herein.

A fourth embodiment of the present invention relates to a battery management system including the load control circuit in the above-described embodiment for executing the load control method in the above-described embodiment.

Referring to fig. 11, the battery management system includes at least one processor 101 (one is illustrated in fig. 4); and a memory 102 communicatively coupled to the at least one processor 101; wherein the memory 102 stores instructions executable by the at least one processor 101, the instructions being executable by the at least one processor 101 to enable the at least one processor 101 to perform the method of the above-described embodiments.

The processor 101, memory 102 may be connected by a bus or other means. The memory 102 is used as a non-volatile computer-readable storage medium for storing non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 101 executes various functional applications of the device and data processing, i.e., implements the load control method in any of the method embodiments described above, by running non-volatile software programs, instructions, and modules stored in the memory 102.

The memory 102 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store filters, etc. In addition, the memory 102 may include high-speed random access memory 102, and may also include non-volatile memory 102, such as at least one disk memory 102 device, flash memory device, or other non-volatile solid-state memory 102 device. In some embodiments, memory 102 optionally includes memory 102 remotely located relative to processor 101, such remote memory 102 being connectable to an external device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 102 that, when executed by the one or more processors 101, perform the load control method of any of the method embodiments described above.

The above device may execute the method provided by the embodiment of the present application, and has the corresponding functional modules and beneficial effects of the execution method, and technical details not described in detail in this embodiment may refer to the method provided by the embodiment of the present application.

Those skilled in the art will appreciate that implementing all or part of the steps in the embodiments of the load access detection method described above may be accomplished based on a program stored in a storage medium, including instructions for causing a device (which may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

A fifth embodiment of the invention relates to a vehicle including the battery management system in the fourth embodiment.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A load control method, comprising:

the load control device controls the switch of the load unit to be turned on according to a driving signal output by the controller, wherein the driving signal is a signal generated by the controller based on a load working instruction;

according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy;

When the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

2. The load control method of claim 1, wherein the method further comprises:

The load control device controls the switch of the load unit to be turned off after the first period of time.

3. The load control method of claim 2 wherein the drive signal comprises a first drive signal and a second drive signal, and wherein the load control device controls the energy storage capacitor of the load control device to store energy according to the drive signal, comprising:

When the first driving signal is at a high level, a delay circuit in the load control device controls the energy storage capacitor to store energy;

When the driving signal is in a high-resistance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on, and the load control device comprises:

when the first driving signal is in a high-resistance state, the delay circuit controls the energy storage capacitor to discharge, and a logic circuit in the load control device controls the switch of the load unit to be kept on;

The load control device controls the switch of the load unit to be turned off after the first period of time, including:

According to the second driving signal, a timing circuit in the load control device controls the energy storage capacitor to stop discharging after the first time period, and the logic circuit controls the switch of the load unit to be turned off.

4. The load control method of claim 1, wherein the method further comprises:

and according to a third driving signal output by the controller, the load control device controls the switch of the load unit to be turned off, and the third driving signal is a signal generated by the controller based on a load turn-off instruction.

5. The load control method of claim 1, wherein the method further comprises:

When a functional safety signal output by the functional safety circuit is received, the load control device controls the switch of the load unit to be disconnected, and the functional safety signal represents that the controller or the functional unit connected with the controller has faults.

6. A load control circuit, comprising: a controller and a load control device connected to each other;

the controller is used for generating a driving signal based on a load working instruction;

The load control device is used for controlling an energy storage capacitor of the load control device to store energy according to the driving signal;

The load control device is also used for controlling the energy storage capacitor to discharge in a first time period when the driving signal is in a high-resistance state, so that the switch of the load unit is kept on.

7. The load control circuit of claim 6 wherein the load control device is further configured to control the switch of the load cell to open after the first period of time.

8. The load control circuit of claim 7 wherein the drive signal comprises a first drive signal and a second drive signal, the load control device comprising a delay circuit, a timing circuit, and a logic circuit interconnected, the logic circuit being connected to the switch of the load cell;

The delay circuit is used for controlling an energy storage capacitor in the delay circuit to store energy according to the first driving signal;

The delay circuit is also used for controlling the energy storage capacitor to discharge when the first driving signal is in a high-resistance state, and controlling the switch of the load unit to be kept on through the logic circuit;

the timing circuit is used for controlling the energy storage capacitor to stop discharging after the first time period according to the second driving signal, and controlling the switch of the load unit to be disconnected through the logic circuit.

9. The load control circuit of claim 6 wherein the load control device is further configured to control the switch of the load cell to open based on a third drive signal output by the controller, the third drive signal being a signal generated by the controller based on a load open command.

10. The load control circuit of claim 6 further comprising a functional safety circuit for outputting a functional safety signal to the load control device upon receipt of a status signal indicative of a fault derived from the output of the controller or a preset control unit;

The load control device is used for controlling the switch of the load unit to be disconnected when the functional safety signal is received.

11. A battery management system comprising the load control circuit of any one of claims 6 to 10.

12. A vehicle comprising the battery management system of claim 11.