CN116435618A

CN116435618A - Battery pack shutdown control method, energy storage device, battery pack system and storage medium

Info

Publication number: CN116435618A
Application number: CN202310268412.2A
Authority: CN
Inventors: 于扬鑫; 陈玉光; 童文平; 郑锐畅; 陈熙; 王雷
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-07-14

Abstract

The application discloses a battery pack shutdown control method, energy storage equipment, a battery pack system and a storage medium, wherein the method comprises the following steps: when the first key signal is detected, confirming the charge and discharge state of the first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation; if the first battery pack is in a non-charging state, generating a shutdown event and clearing a first key signal; if the first battery pack is in a charging state, the first key signal is cleared, and a shutdown event is generated when a synchronous shutdown signal is received; responding to a shutdown event to enter a shutdown state, and sending a synchronous shutdown signal to the electric energy management system; the electric energy management system is used for outputting synchronous shutdown signals to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs; and after entering the shutdown state, executing shutdown operation. The method can avoid the abnormality of restarting the battery pack and the like caused by misread of the first key signal which is not cleared in the shutdown process, and ensure that the battery pack can be normally shutdown.

Description

Battery pack shutdown control method, energy storage device, battery pack system and storage medium

Technical Field

The present disclosure relates to the field of batteries, and in particular, to a battery pack shutdown control method, an energy storage device, a battery pack system, and a storage medium.

Background

In order to improve the endurance of the energy storage device, parallel operation is generally realized by simultaneously connecting a plurality of battery packs. However, when a plurality of battery packs connected in parallel are controlled to be powered off, because the plurality of battery packs usually use the same button as a power on/off button, for example, when the button is pressed for a long time or the button is pressed for a long time to be powered on, shutdown abnormality problems such as automatic restarting of other battery packs or incapability of synchronous shutdown of battery packs connected in parallel, which are caused by failure of shutdown of part of battery packs, easily occur, and normal operation of the battery packs is affected.

Therefore, in a scenario where a plurality of battery packs are connected in parallel, how to control the shutdown of the battery pack to avoid the occurrence of shutdown abnormality of the battery pack is a problem to be solved.

Disclosure of Invention

The application provides a battery pack shutdown control method, energy storage equipment, a battery pack system and a storage medium, which can solve shutdown abnormal problems that in the related technology, partial battery packs are easy to shut down and cause automatic restarting of other battery packs or battery packs which cannot be combined cannot synchronously shut down and the like.

In a first aspect, the present application provides a battery pack shutdown control method, including:

when a first key signal is detected, confirming the charge and discharge states of the first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation; if the first battery pack is in a non-charging state, generating a shutdown event and clearing the first key signal; if the first battery pack is in a charging state, the first key signal is cleared, and the shutdown event is generated when a synchronous shutdown signal is received; responding to the shutdown event to enter a shutdown state, and sending the synchronous shutdown signal to an electric energy management system; the electric energy management system is used for outputting the synchronous shutdown signal to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs; and after entering the shutdown state, executing shutdown operation.

In a second aspect, the present application further provides an energy storage device, the energy storage device including a first battery pack, a memory, and a processor, and a parallel interface; the parallel operation interface is used for being connected with other energy storage devices or independent battery packs; the memory is used for storing a computer program; the processor is configured to implement the battery pack shutdown control method described above when executing the computer program.

In a third aspect, the present application also provides a battery pack system comprising at least two connected battery packs, each battery pack comprising a processor; the processor is used for realizing the battery pack shutdown control method.

In a fourth aspect, the present application further provides a computer readable storage medium storing a computer program, where the computer program when executed by a processor causes the processor to implement a battery pack shutdown control method as described above.

The application discloses a battery pack shutdown control method, energy storage equipment, a battery pack system and a storage medium, wherein the method comprises the following steps: when the first key signal is detected, confirming the charge and discharge state of the first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation; if the first battery pack is in a non-charging state, generating a shutdown event and clearing a first key signal; if the first battery pack is in a charging state, the first key signal is cleared, and a shutdown event is generated when a synchronous shutdown signal is received; responding to a shutdown event to enter a shutdown state, and sending a synchronous shutdown signal to the electric energy management system; the electric energy management system is used for outputting synchronous shutdown signals to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs; and after entering the shutdown state, executing shutdown operation. According to the embodiment of the application, when the first key signal is detected, the first key signal is cleared no matter what state the battery pack is in, and then the shutdown operation is selectively executed or not executed according to the charging state response or non-response of the battery pack to the first key signal, so that the abnormality that the battery pack is restarted and the like caused by misread of the first key signal which is not cleared in the shutdown process can be avoided, and the battery pack can be ensured to be normally shutdown.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a battery pack system according to an embodiment of the present application;

fig. 2 is a schematic circuit diagram of a battery pack system according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a battery pack shutdown control method provided in an embodiment of the present application;

FIG. 5 is a schematic flow chart of sub-steps for performing a shutdown operation provided by an embodiment of the present application;

FIG. 6 is a schematic flow chart diagram of another battery pack shutdown control method provided by an embodiment of the present application;

fig. 7 is a schematic flowchart of another battery pack shutdown control method provided in an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.

It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

The embodiment of the application provides a battery pack shutdown control method, energy storage equipment, a battery pack system and a storage medium. The battery pack shutdown control method can be applied to the energy storage equipment, and by clearing the first key signal when the first key signal is detected regardless of the state of the battery pack, and then selectively executing or not executing shutdown operation according to the charging state response or non-response of the battery pack to the first key signal, the abnormal condition that the battery pack is restarted and the like caused by misread of the first key signal which is not cleared in the shutdown process can be avoided, and the battery pack can be ensured to be normally shutdown.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack system 10 according to an embodiment of the present application, and as shown in fig. 1, the battery pack system 10 includes at least two connected battery packs 11, each battery pack 11 includes a processor 110, and the processor 110 is configured to implement any one of the battery pack shutdown control methods of the present application.

The plurality of battery packs in the battery pack system 10 may be battery packs in the same energy storage device or battery packs in a plurality of energy storage devices, for example. Multiple battery packs 110 in the battery pack system 10 may be charged and discharged concurrently.

The battery pack system 10 further includes a processor 101 loaded with a power management system (Energy Management System, battery Management System) for communicating with a power management system (power management system) loaded within the processor 110 of each battery pack 110 to manage the battery packs 11 in the battery pack system 10. The BMS serves as a management unit inside each battery pack system 10 for monitoring an operation state of each battery pack 11, controlling the switching on and off of the battery pack 11, communicating with the EMS, and receiving and executing various instructions issued by the EMS. The EMS serves as a management unit of the battery pack system 10 for communicating with the BMS system of each battery pack 11 to realize management of each battery pack 11.

It will be appreciated that in some embodiments, the processor 101 of the battery pack system 10 may also multiplex any of the processors 110 of the plurality of battery packs 11. At this time, the battery pack 11 serves as a main battery pack, and the processor 101 thereof is loaded with both an EMS system and a BMS system for executing any one of the battery pack shutdown control methods of the present application.

The processor 110 or the processor 101 may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Referring to fig. 2, fig. 2 is a schematic circuit diagram of a battery pack system 10 according to an embodiment of the present application, and as shown in fig. 2, the battery pack system 10 may include a plurality of battery packs 11, for example, a battery pack a, a battery pack B, and so on.

The charging interface 12 of the battery pack 11 is used for accessing the power supply device 13, and a capacitor C is connected to an output interface of the power supply device 13 connected with the charging interface 12.

For example, an inverter, a step-up and step-down circuit, an MPPT (Maximum Power Point Tracking ) circuit, and the like may be included in the power supply device 13 for charging the battery pack or discharging the battery pack to the outside.

Illustratively, each battery pack 11 may include a discharge switching tube and a charge switching tube in addition to the cell stack. As shown in fig. 2, the discharge switching tube Q1 and the charge switching tube Q2 in the battery pack a and the discharge switching tube Q3 and the charge switching tube Q4 in the battery pack B. Among them, the discharge switching tube and the charge switching tube may include, but are not limited to, a triode, a field-effect transistor (MOS) -Semiconductor Field-Effect Transistor, or an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), etc. The discharging switch tube is used for controlling the discharging of the battery pack, and the charging switch tube is used for controlling the charging of the battery pack.

Illustratively, each battery pack 11 may further include a heating resistor and a heating switch tube connected between the charging interfaces 12. Wherein, heating resistor and heating switch tube establish ties.

As shown in fig. 2, the heating resistor R1 and the heating switch tube K1 in the battery pack a, and the heating resistor R2 and the heating switch tube K2 in the battery pack B. Among them, the heating switching tube K1 and the heating switching tube K2 may include, but are not limited to, a transistor, a field-effect transistor (MOS), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), a relay, an optocoupler, and the like.

The heating resistor is used to heat the battery pack. For example, when the battery pack is operated at a low temperature, the heating resistor may be controlled to operate to heat the battery pack so that the battery pack temperature reaches a safe operating temperature. The heating switch tube is used for controlling the heating resistor to work or not work.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy storage device 20 according to an embodiment of the present application, and as shown in fig. 3, the energy storage device 20 may include a battery pack 21, a memory 22, a processor 23, and a parallel interface 24.

The energy storage device 20 may be a mobile energy storage device, a home energy storage device, or a vehicle-mounted energy storage device, for example.

The processor 23 may be connected to the battery pack 21, the memory 22, and the parallel interface 24 through a bus, for example, any suitable communication bus such as an I2C (Inter-integrated Circuit) bus. The processor 23 is used to provide computing and control capabilities to support the operation of the overall energy storage device 20.

Illustratively, the energy storage device 20 may include at least one battery pack 21; wherein the battery pack 21 can be connected with at least one other battery pack through the parallel interface 24 to form a battery pack system. The processor 23 may be a separate processor of the energy storage device 20 or may be a processor built into each battery pack 21.

The processor 23 may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In an embodiment of the present application, the processor 110 in fig. 1 and the processor 23 in fig. 3 may implement the following steps when executing the relevant computer program:

In one embodiment, the charging interface of the first battery pack is used for accessing power supply equipment, and a capacitor is connected to an output interface of the power supply equipment connected with the charging interface; the processor, when implementing execution of the shutdown operation, is configured to implement:

controlling the first battery pack to form a discharging path to discharge the capacitor; and when the capacitor finishes discharging, shutting down the first battery pack.

In one embodiment, the first battery pack further includes a heating resistor; the processor is used for realizing that when realizing controlling the first battery pack to form a release path to discharge the capacitor:

disconnecting a discharge switching tube of the first battery pack to cut off a discharge loop of the first battery pack; and controlling the heating resistor to work to form the discharge path so that the capacitor discharges the heating resistor.

In one embodiment, the first battery pack further includes a heating switch tube; the processor is used for realizing that the heating resistor and the heating switch tube are connected between the charging interfaces, and controlling the heating resistor to work to form the discharging path is further used for realizing when the capacitor discharges the heating resistor:

And controlling the conduction of the heating switch tube to conduct a discharge loop between the capacitor and the heating resistor.

In one embodiment, the first battery pack is connected to a power supply device through a charging interface, and the processor is further configured to implement:

after entering a shutdown state, determining the shutdown state type of the first battery pack, wherein the shutdown state type comprises a normal shutdown state or an abnormal shutdown state; if the first battery pack is in a normal shutdown state, sending a charging permission signal to the power supply equipment, wherein the charging permission signal is used for allowing the power supply equipment to wake up the first battery pack; and if the first battery pack is in an abnormal shutdown state, sending a charge prohibition signal to the power supply equipment, wherein the charge prohibition signal is used for prohibiting the power supply equipment from waking up the first battery pack.

In one embodiment, the processor is further configured to implement:

after entering the shutdown state, confirming shutdown failure and waking up the first battery pack when detecting that the input voltage of the charging interface is a preset voltage.

In one embodiment, the processor, when implementing the determining the shutdown state type of the first battery pack, is configured to implement:

Confirming a trigger signal for entering the shutdown state; and if the trigger signal is an under-voltage shutdown signal and the voltage of the first battery pack is smaller than or equal to a preset voltage threshold value, confirming that the shutdown state type of the first battery pack is an abnormal shutdown state.

after entering a shutdown state, acquiring the voltage of the first battery pack; and if the voltage of the first battery pack is larger than a preset voltage threshold value, confirming that the shutdown state type of the first battery pack is a normal shutdown state.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict. Referring to fig. 4, fig. 4 is a schematic flowchart of a battery pack shutdown control method according to an embodiment of the present application. As shown in fig. 4, the battery pack shutdown control method includes steps S101 to S105.

Step S101, when a first key signal is detected, confirming the charge and discharge state of the first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation.

It should be noted that, the method for controlling shutdown of the battery pack provided in the embodiment of the present application may be applied to the battery pack, where when the first key signal is detected, the first key signal is cleared regardless of the state of the battery pack, and then shutdown operation is selectively executed or not executed according to the charging state response or non-response of the battery pack to the first key signal, so that abnormality such as restarting the battery pack caused by misreading the first key signal that is not cleared in the shutdown process can be avoided, and normal shutdown of the battery pack is ensured.

The first battery pack may be a battery pack in the energy storage device, or may be a battery pack in the battery pack system.

In some embodiments, when the first key signal is detected, the charge-discharge state of the first battery pack is confirmed. The first key signal is used for triggering shutdown operation or triggering startup operation.

It should be noted that, the same button is usually multiplexed by multiple battery packs as the on-off key, when the battery packs are in the on-state, the user can trigger the off operation by pressing the on-off key for a long time; when the battery pack is in a shutdown state, a user can trigger startup operation by pressing the startup and shutdown key for a long time.

For example, the charge and discharge states of the battery pack may include a charge state and a discharge state. The charging state may be that the external power supply device charges the battery pack, or may be that other battery packs in the battery pack system charge the battery pack. The discharging state can be that the battery pack discharges external electric equipment, or that the battery pack discharges other battery packs in the battery pack system. It will be appreciated that in a battery pack system, different battery packs may be co-charged when disconnected from an external power supply device, e.g., a battery pack with a higher voltage may charge a battery pack with a lower voltage. It should be understood that when different battery packs are connected in parallel, the mutual charge current should be limited within the safe current range, and thus, the voltage difference between the different battery packs should be smaller than the safe voltage difference.

For example, the charge and discharge state of the first battery pack may be determined by detecting the power of the first battery pack. For example, when the first battery pack output power is detected, the first battery pack may be determined to be in a discharge state; for another example, the first battery pack may be determined to be in a charged state when input power to the first battery pack is detected. In addition, the charge and discharge states of the first battery pack can be determined by detecting parameters such as the charge voltage, the charge current and the like of the first battery pack. For example, when it is detected that the charging current of the first battery pack is greater than a preset current threshold, it may be determined that the first battery pack is in a charged state. The preset current threshold may be set according to actual situations, and specific values are not limited herein.

In the above embodiment, when the first key signal is detected, the charge/discharge state of the first battery pack is confirmed, and then the first key signal may be responded or not according to the charge state of the first battery pack, so that the shutdown operation may be selectively performed or not.

Step S102, if the first battery pack is in a non-charging state, a shutdown event is generated and the first key signal is cleared.

For example, when the first battery pack is in a non-charged state, a shutdown event is generated and the first key signal is cleared. The non-charging state may include a discharging state and an idle state, among others.

For example, a shutdown event may be generated and the first key signal cleared while the first battery pack is in a discharged state. For another example, a shutdown event may be generated and the first key signal cleared while the first battery pack is in an idle state.

In the related art, when a plurality of battery packs connected in parallel are controlled to be shut down, shutdown abnormality problems such as automatic restarting of other battery packs caused by partial battery pack shutdown failure during shutdown easily occur. It should be noted that, after the battery pack fails to shutdown and returns to the state of detecting the power-on signal after overtime, the key signal is re-detected and enters the power-on state, and the synchronous power-on signal is sent to other battery packs, so that the other battery packs are restarted. In the embodiment of the application, the power-off event is generated and the first key signal is cleared when the battery pack is in the non-charging state, so that the abnormality such as restarting of the battery pack caused by misread of the first key signal which is not cleared in the power-off process due to power-off failure can be avoided, and the battery pack can be ensured to be normally powered off.

Step S103, if the first battery pack is in a charging state, the first key signal is cleared, and the shutdown event is generated when a synchronous shutdown signal is received.

The first key signal is cleared when the first battery pack is in a charged state, but is not responsive to the first key signal to generate a shutdown event. At this time, the first key signal is cleared, and after other battery packs in the battery pack system enter the shutdown state, even if some shutdown fails, the first key signal cannot be read again and is mistakenly identified as a startup signal, so that restarting is caused.

It should be noted that, each battery pack may be used as an independent battery pack for charging and discharging, at this time, when the battery pack is in a charging state, in order to ensure charging safety, key-off is usually not allowed, so the battery pack in the charging state will not respond to the key-off signal, that is, at this time, a power-off event will not be generated according to the received first key-off signal. However, when the synchronous shutdown signal sent by the electric energy management system is received, it is indicated that the battery pack is used by a battery pack system formed by other battery packs at the moment, and the whole battery pack system has other battery packs in a shutdown state, so that a shutdown event is generated according to the synchronous shutdown signal in order to keep synchronization.

The synchronous shutdown signal is sent to the electric energy management system by other battery packs entering the shutdown state. It can be understood that when each battery pack enters a shutdown state, a synchronous shutdown signal is sent to the power management system to inform the power management system of the latest state of the battery pack, and the power management system synchronously controls other battery packs to shutdown (if the battery packs do not enter the shutdown state), so as to ensure that the battery packs of the whole battery pack system keep consistent in state.

According to the embodiment, when the battery pack is in the charging state, the first key signal is cleared, and the shutdown event is generated when the synchronous shutdown signal is received, so that the battery pack can enter the shutdown state in response to the shutdown event, and the battery pack can be prevented from being restarted and the like due to misread of the first key signal which is not cleared in the shutdown process, and the battery pack can be ensured to be normally shutdown.

Step S104, responding to the shutdown event to enter a shutdown state, and sending the synchronous shutdown signal to an electric energy management system; the electric energy management system is used for outputting the synchronous shutdown signal to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs.

For example, after the shutdown event is generated in step S103 or the shutdown event is generated in step S104, the shutdown state may be entered in response to the shutdown event.

In some embodiments, when the power-off state is entered, a synchronous power-off signal is sent to the power management system, so that the power management system outputs the synchronous power-off signal to other battery packs in the battery pack system to control the other battery packs to synchronously power off.

In the related art, when a plurality of battery packs connected in parallel are controlled to be powered off, shutdown abnormality such as failure of a certain battery pack connected in parallel to be powered off synchronously is likely to occur. In the embodiment of the application, when the power-off state is entered, the synchronous power-off signal is sent to the electric energy management system, so that the electric energy management system can output the synchronous power-off signal to other battery packs in the battery pack system, thereby controlling the synchronous power-off of the other battery packs and ensuring that the battery packs can be normally powered off.

Step S105, after entering the shutdown state, executing the shutdown operation.

For example, a shutdown operation may be performed after entering a shutdown state in response to a shutdown event. The shutdown operation may include, among other things, pulling down the voltage of the battery chip IO port.

In this embodiment of the present application, the charging interface of the first battery pack is used for accessing to the power supply device, and the output interface of the power supply device connected with the charging interface is connected with a capacitor. When the first battery pack is shut down, if the capacitor stores electric quantity, the capacitor can supply power to a chip in the first battery pack, so that the first battery pack fails to shut down.

It is understood that herein, the battery chip includes, but is not limited to, a processor loaded with a BMS, an AFE (Analog Front End) chip, etc. within the first battery pack.

Referring to fig. 5, fig. 5 is a schematic flowchart of sub-steps for performing a shutdown operation according to an embodiment of the present application, which may include the following steps S201 and S202.

Step S201, controlling the first battery pack to form a bleed path to discharge the capacitor.

For example, when the first battery pack is controlled to form a discharging path to discharge the capacitor, the discharging path can be formed by controlling the heating resistor in the first battery pack to work, so that the capacitor discharges the heating resistor.

In some embodiments, controlling the first battery pack to form a bleed path to discharge the capacitor may include: disconnecting the discharge switch tube of the first battery pack to cut off the discharge loop of the first battery pack; and controlling the heating resistor to work to form a discharge path so that the capacitor discharges the heating resistor.

When the first battery pack is in a working state, the first battery pack can provide electric energy for the heating resistor to work through the discharging loop, and can charge the capacitor through the discharging loop. When the heating resistor is controlled to work, if the discharging loop of the first battery pack is not cut off, the first battery pack can supply power to the heating resistor through the discharging loop, and can charge the capacitor, so that the capacitor can not be controlled to discharge.

For example, as shown in fig. 2, for the battery pack a, the discharge switching tube Q1 of the battery pack a may be opened to cut off the discharge circuit of the battery pack a. For example, an off signal may be transmitted to the discharge switching tube Q1 such that the discharge switching tube Q1 is turned off according to the off signal. Then, when the heating resistor R1 is controlled to operate, the electric energy consumed by the operation of the heating resistor R1 is inevitably from the capacitor C on the output interface of the power supply device, and therefore, the battery pack a can discharge the heating resistor R1 by cutting off the discharge circuit and operating the heating resistor.

In the above embodiment, the discharging switch tube of the first battery pack is turned off to cut off the discharging loop of the first battery pack, so that the first battery pack cannot charge the capacitor through the discharging loop when the heating resistor is controlled to work, and the capacitor discharges the heating resistor.

In some embodiments, controlling the heating resistor to operate forms a bleed path to cause the capacitor to discharge the heating resistor may include: the heating switch tube is controlled to be conducted so as to conduct a discharging loop between the capacitor and the heating resistor.

For example, as shown in fig. 2, for the battery pack a, the heating switching tube K1 may be controlled to be turned on to turn on the discharge loop between the capacitor C and the heating resistor R1. For example, a turn-on signal may be sent to the heating switching tube K1, so that the heating switching tube K1 turns on a discharge loop between the capacitor C and the heating resistor R1 according to the turn-on signal.

In the above embodiment, the capacitor may be made to discharge the heating resistor by controlling the heating switch tube to be turned on to conduct the discharge loop between the capacitor and the heating resistor.

And step S202, when the capacitor finishes discharging, shutting down the first battery pack.

Illustratively, the first battery pack is shut down when the capacitor is completely discharged. For example, when the capacitor voltage of the capacitor is detected to be smaller than a preset voltage threshold, it is determined that the capacitor is completely discharged, wherein the preset voltage threshold can be set according to actual conditions, and specific values are not limited herein. For another example, when the discharge time of the capacitor is detected to be longer than a preset time threshold, it is determined that the capacitor is completely discharged, where the preset voltage threshold may be set according to a parameter of the capacitor, and the specific value is not limited herein.

For example, when the first battery pack is shut down, the voltage of the IO port of the battery chip can be pulled down.

When the capacitor finishes discharging, the first battery pack is powered off, so that the first battery pack can be prevented from being powered on a chip in the first battery pack by the capacitor when the first battery pack enters a power-off state, and the first battery pack fails to power off due to overtime.

Referring to fig. 6, fig. 6 is a schematic flowchart of another battery pack shutdown control method according to an embodiment of the present application, which may include the following steps S301 to S303.

Step S301, after entering a shutdown state, determining a shutdown state type of the first battery pack, where the shutdown state type includes a normal shutdown state or an abnormal shutdown state.

For example, after entering the shutdown state, the shutdown state type of the first battery pack may also be determined, where the shutdown state type may include a normal shutdown state or an abnormal shutdown state.

It should be noted that the abnormal shutdown state may include voltage undervoltage shutdown of the first battery pack. The normal shutdown state is other shutdown states except the voltage under-voltage shutdown.

It should be noted that, in the related art, the battery pack sends a charge prohibiting signal to the power supply device after entering the shutdown state, so that the power supply device inputs zero voltage and zero current to the battery pack. At this time, if the power supply device is plugged into the charging interface of the battery pack, the power supply device needs to wake up the battery pack, and because the battery pack cannot send related instructions to the power supply device in a shutdown state, the power supply device can only wake up the battery pack again after waiting for timeout. The power supply equipment is prevented from waking up the battery pack after the waiting time-out, and the power supply equipment is prevented from waking up the battery pack again after the waiting time-out when the battery pack is in the abnormal shutdown state.

In some embodiments, determining the shutdown state type of the first battery pack may include: confirming a trigger signal for entering a shutdown state; if the trigger signal is an under-voltage shutdown signal and the voltage of the first battery pack is smaller than or equal to a preset voltage threshold value, confirming that the shutdown state type of the first battery pack is an abnormal shutdown state.

It should be noted that, when the first battery pack enters the shutdown state, it is required to trigger by a trigger signal. When the voltage of the first battery pack is too low, the under-voltage protection is triggered, so that the first battery pack is shut down. When the voltage of the first battery pack is too high, overvoltage protection is triggered, so that the first battery pack is shut down.

When the first battery pack enters the shutdown state, if the trigger signal entering the shutdown state is an under-voltage shutdown signal and the voltage of the first battery pack is less than or equal to a preset voltage threshold, determining that the shutdown state type of the first battery pack is an abnormal shutdown state. The voltage of the first battery pack may be acquired by an AFE chip or other sampling circuit, for example, the voltage of the first battery pack may be acquired by a voltage sampling circuit. For another example, the voltage of the first battery pack may be read by the power management system.

The preset voltage threshold may be set according to actual situations, and specific values are not limited herein, and may be determined according to different first battery pack types. When the voltage of the first battery pack is smaller than or equal to the preset voltage threshold, the first battery pack is indicated to be severely undervoltage, and at the moment, if the first battery pack is allowed to be charged, safety accidents are likely to be caused, so that the battery is considered to be in an abnormal shutdown state, and the power supply equipment is forbidden to wake up the first battery pack in a charging mode, namely, at the moment, if the power supply equipment is connected with a charging power supply, the power supply equipment can not provide input voltage for the first battery pack.

In the above embodiment, by confirming the trigger signal for entering the shutdown state, when the trigger signal is an under-voltage shutdown signal and the voltage of the first battery pack is less than or equal to the preset voltage threshold, it is possible to confirm that the shutdown state type of the first battery pack is an abnormal shutdown state.

In other embodiments, determining the shutdown state type of the first battery pack may include: after entering a shutdown state, acquiring the voltage of a first battery pack; and if the voltage of the first battery pack is larger than the preset voltage threshold, confirming that the shutdown state type of the first battery pack is a normal shutdown state.

For example, when the voltage of the first battery pack is greater than the preset voltage threshold, it may be determined that the shutdown state type of the first battery pack is a normal shutdown state. Even if the first battery pack is powered off due to undervoltage, the voltage value of the first battery pack is still in the range allowing normal charging, so that if the power supply equipment is connected to the charging power supply at the moment, the first battery pack can be awakened to be charged in a mode of outputting charging voltage.

In the above embodiment, by acquiring the voltage of the first battery pack, it may be determined that the shutdown state type of the first battery pack is the normal shutdown state when the voltage of the first battery pack is greater than the preset voltage threshold.

Step S302, if the first battery pack is in a normal shutdown state, sending a charging permission signal to the power supply device, where the charging permission signal is used to allow the power supply device to wake up the first battery pack.

For example, when the first battery pack is in the normal shutdown state, an allowable charge signal for allowing the power supply apparatus to wake up the first battery pack may be transmitted to the power supply apparatus. The charging enable signal may be a high level signal or a low level signal.

When the first battery pack is in a normal shutdown state, the power supply equipment is allowed to wake up the first battery pack, so that the power supply equipment can be prevented from waking up the first battery pack again only after waiting for overtime when the power supply equipment is connected to the first battery pack, and the first battery pack can be immediately woken up to charge when the power supply equipment is powered on.

Step 303, if the first battery pack is in an abnormal shutdown state, sending a charge prohibition signal to the power supply device, where the charge prohibition signal is used to prohibit the power supply device from waking up the first battery pack.

For example, as described above, when the first battery pack is in the abnormal shutdown state, it is indicated that the first battery pack has been severely under-voltage, and then the safety accident is likely to be caused if the first battery pack is allowed to be charged, so that the power supply device should be prohibited from waking up the first battery pack by charging. At this time, a charge prohibition signal for prohibiting the power supply apparatus from waking up the first battery pack may be transmitted to the power supply apparatus to ensure that the first battery pack is not arbitrarily charged. The charge prohibition signal may be a high level signal or a low level signal. For example, when the charge enable signal is a high level signal, the charge disable signal is a low level signal. When the charge enable signal is a low level signal, the charge disable signal is a high level signal.

When the first battery pack is in an abnormal shutdown state, the power supply equipment is forbidden to wake up the first battery pack, so that the power supply equipment does not input voltage and current to the first battery pack, and the problem that the power supply equipment can only wake up the first battery pack again after waiting for overtime when the power supply equipment is connected to the first battery pack is avoided.

Referring to fig. 7, fig. 7 is a schematic flowchart of another battery pack shutdown control method according to an embodiment of the present application, which may include the following steps S401 to S405.

Step S401, when a first key signal is detected, confirming the charge and discharge state of a first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation.

Step S402, if the first battery pack is in a non-charging state, a shutdown event is generated and the first key signal is cleared.

Step S403, if the first battery pack is in a charging state, clearing the first key signal and generating the shutdown event when receiving a synchronous shutdown signal.

Step S404, responding to the shutdown event to enter a shutdown state, and sending the synchronous shutdown signal to an electric energy management system; the electric energy management system is used for outputting the synchronous shutdown signal to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs.

It will be appreciated that the steps S401 to S404 are the same as the steps S101 to S104, and will not be repeated here.

Step S405, after entering the shutdown state, when detecting that the input voltage of the charging interface is a preset voltage, determining that shutdown fails and waking up the first battery pack.

After entering the shutdown state, if the input voltage of the charging interface is detected to be the preset voltage, the shutdown failure is confirmed and the first battery pack is awakened. The preset voltage may be set according to actual conditions, and specific values are not limited herein.

After the first battery pack enters the shutdown state, if the power supply device is connected to an external charging power supply or the internal energy storage unit of the power supply device can supply power to the outside, the power supply device can output a preset voltage to the charging interface of the first battery pack through the output interface. Or when the plurality of battery packs are connected in parallel, the power supply equipment is not connected in, and in the shutdown state, the power supply equipment is connected in the first battery pack through the output interface and the charging interface of the first battery pack, so that the power supply equipment can input voltage to the first battery pack. At this time, when the first battery pack detects the input voltage, the first battery pack confirms that shutdown fails and enters a startup detection state, and if the input voltage is greater than a preset voltage, the first battery pack is controlled to enter the startup state, and the first battery pack is awakened again.

According to the embodiment, after the power supply device enters the power-off state, when the input voltage of the charging interface is detected to be the preset voltage, the power-off failure is confirmed and the first battery pack is awakened, so that the power supply device can be prevented from awakening the first battery pack again only after waiting for overtime when the power supply device is connected to the first battery pack.

Embodiments of the present application further provide a computer readable storage medium, where a computer program is stored, where the computer program includes program instructions, and a processor executes the program instructions to implement any one of the battery pack shutdown control methods provided in the embodiments of the present application.

For example, the program is loaded by a processor, and the following steps may be performed:

The computer readable storage medium may be an internal storage unit of the energy storage device according to the foregoing embodiment, for example, a hard disk or a memory of the energy storage device. The computer readable storage medium may also be an external storage device of the energy storage device, such as a plug-in hard disk, a Smart Media Card (SMC), a secure digital Card (Secure Digital Card, SD Card), a Flash memory Card (Flash Card) or the like, which are provided on the energy storage device.

Further, the computer-readable storage medium may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, a program required for at least one function, and the like; the storage data area may store data created according to each program, and the like.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of battery pack shutdown control, wherein a first battery pack is applied, the battery pack being connected with at least one other battery pack to form a battery pack system, the method comprising:

when a first key signal is detected, confirming the charge and discharge states of the first battery pack; the first key signal is used for triggering shutdown operation or triggering startup operation;

if the first battery pack is in a non-charging state, generating a shutdown event and clearing the first key signal;

if the first battery pack is in a charging state, the first key signal is cleared, and the shutdown event is generated when a synchronous shutdown signal is received;

responding to the shutdown event to enter a shutdown state, and sending the synchronous shutdown signal to an electric energy management system; the electric energy management system is used for outputting the synchronous shutdown signal to other battery packs in the battery pack system so as to control the synchronous shutdown of the other battery packs;

and after entering the shutdown state, executing shutdown operation.

2. The battery pack shutdown control method according to claim 1, wherein a charging interface of the first battery pack is used for being connected with a power supply device, and an output interface connected with the charging interface of the power supply device is connected with a capacitor; the executing a shutdown operation includes:

Controlling the first battery pack to form a discharging path to discharge the capacitor;

and when the capacitor finishes discharging, shutting down the first battery pack.

3. The battery pack shutdown control method of claim 2, wherein the first battery pack further comprises a heating resistor; the controlling the first battery pack to form a bleed path to discharge the capacitor includes:

disconnecting a discharge switching tube of the first battery pack to cut off a discharge loop of the first battery pack;

and controlling the heating resistor to work to form the discharge path so that the capacitor discharges the heating resistor.

4. The battery pack shutdown control method of claim 3, wherein the first battery pack further comprises a heating switch tube; the heating resistor and the heating switch tube are connected between the charging interfaces, the heating resistor is controlled to work to form the discharging path, so that the capacitor discharges to the heating resistor, and the capacitor further comprises:

5. The battery pack shutdown control method of claim 1, wherein the first battery pack is connected to a power supply device through a charging interface, the method further comprising:

After entering a shutdown state, determining the shutdown state type of the first battery pack, wherein the shutdown state type comprises a normal shutdown state or an abnormal shutdown state;

if the first battery pack is in a normal shutdown state, sending a charging permission signal to the power supply equipment, wherein the charging permission signal is used for allowing the power supply equipment to wake up the first battery pack;

and if the first battery pack is in an abnormal shutdown state, sending a charge prohibition signal to the power supply equipment, wherein the charge prohibition signal is used for prohibiting the power supply equipment from waking up the first battery pack.

6. The battery pack shutdown control method of claim 5, further comprising:

7. The battery pack shutdown control method of claim 5, wherein the determining the shutdown state type of the first battery pack comprises:

confirming a trigger signal for entering the shutdown state;

and if the trigger signal is an under-voltage shutdown signal and the voltage of the first battery pack is smaller than or equal to a preset voltage threshold value, confirming that the shutdown state type of the first battery pack is an abnormal shutdown state.

8. The battery pack shutdown control method of claim 5, wherein the determining the shutdown state type of the first battery pack comprises:

after entering a shutdown state, acquiring the voltage of the first battery pack;

and if the voltage of the first battery pack is larger than a preset voltage threshold value, confirming that the shutdown state type of the first battery pack is a normal shutdown state.

9. An energy storage device, wherein the energy storage device comprises a first battery pack, a memory, a processor and a parallel machine interface;

the parallel operation interface is used for being connected with other energy storage devices or independent battery packs;

the memory is used for storing a computer program;

the processor is configured to implement the battery pack shutdown control method according to any one of claims 1 to 8 when executing the computer program.

10. A battery pack system comprising at least two connected battery packs, each battery pack comprising a processor for implementing the battery pack shutdown control method of any of claims 1 to 8.