Power supply state control method and device, energy storage device and computer readable medium

Abstract

The invention provides a power supply state control method and device, an energy storage device and a computer readable medium. The control method comprises the following steps: in response to a battery shutdown event, obtaining a minimum battery cell voltage value in each battery cell of a battery; comparing the minimum cell voltage value with a first set voltage value; when the minimum battery cell voltage value is greater than a first set voltage value, obtaining the maximum battery cell voltage value in each battery cell of the battery, and comparing the maximum battery cell voltage value with a second set voltage value; when the maximum battery cell voltage value is smaller than or equal to a second set voltage value, comparing the maximum battery cell voltage value with a third set voltage value; and when the maximum battery cell voltage value is greater than a third set voltage value, the battery management system switches the current power supply state into a long-term energy consumption storage state, so that the battery is dormant for a long time under a low-energy-consumption strategy. According to the invention, the current power supply state of the battery is managed and controlled.

Description

Technical Field

[0001] The present invention relates to the field of battery management technology, and in particular to a power state control method, device, energy storage device and computer-readable medium. Background Art

[0002] A battery management system (BMS) is a system used to manage and monitor battery packs. It is mainly used in equipment that requires precise battery management, such as mobile equipment such as drones and unmanned vehicles. The battery management system needs to communicate with external devices in real time to receive the current battery data (such as voltage, current, temperature, and alarm information, etc.) of the batteries contained in the mobile equipment in various states in real time for precise control. The aforementioned external devices are all powered by batteries and can be regarded as loads formed by electrical connection with the batteries.

[0003] In actual application scenarios, in order to ensure the working efficiency of mobile working equipment such as drones, drones are required to work continuously. The capacity of the battery that the drone relies on directly affects the duration of its operation. Therefore, for mobile working equipment such as drones, it is necessary to configure multiple large-capacity batteries to circulate and power the drone to ensure continuous operation. The battery management system in the prior art is difficult to manage the charging and discharging of the battery and the battery status, especially when the battery is stored for a long time, problems such as spontaneous combustion of the battery cell and over-discharge of the battery cell may occur.

[0004] In view of this, it is necessary to improve the power on / off control method of the battery management system in the prior art to solve the above problems.

[0005] It should be noted that the above introduction to the background technology is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the battery management system in the prior art is difficult to manage the charging and discharging and battery status of the battery, especially the problems of spontaneous combustion of the battery cell and over-discharge of the battery cell during long-term storage.

[0007] To achieve the above object, the present invention provides a method for controlling a power state, which is applied to a battery management system for controlling multiple cells in a battery. The control method comprises: In response to a battery shutdown event, obtaining a minimum cell voltage value in each cell of the battery; Comparing the minimum cell voltage value with the first set voltage value; When the minimum cell voltage value is greater than the first set voltage value, obtaining a maximum cell voltage value in each cell of the battery, and comparing the maximum cell voltage value with the second set voltage value; When the maximum cell voltage value is less than or equal to the second set voltage value, comparing the maximum cell voltage value with a third set voltage value; When the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is in long-term dormancy under a low energy consumption strategy; The second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

[0008] As a further improvement of the present invention, after responding to the battery shutdown event, the method includes: Determine a shutdown mode corresponding to the battery shutdown event, wherein the shutdown mode includes an input instruction mode and an instruction generation mode; When the shutdown mode corresponding to the battery shutdown event is the instruction generation mode, the step of obtaining the minimum cell voltage value of each cell of the battery is performed, and comparing the minimum cell voltage value with the first set voltage value.

[0009] As a further improvement of the present invention, When the shutdown mode corresponding to the battery shutdown event is the input command mode, and when the current power state is the on state, determining whether the current power state is the long-term storage energy consumption state and the trigger flag is in the untriggered state; If yes, upon receiving two input commands, the single-chip microcomputer in the battery management system is restarted to restart the battery, and the trigger flag is switched to a trigger state; If not, shut down.

[0010] As a further improvement of the present invention, the power supply state also includes: a deep sleep energy consumption state; When the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is greater than the second set voltage value, the battery management system switches the current power state to a deep sleep energy consumption state; When the current power state is a long-term storage energy consumption state, the corresponding strategy is: setting a shutdown time, clearing the storage flag bit of the register in the single-chip microcomputer in the battery management system, and writing the shutdown time into the shutdown flag bit of the register; When the current power state is the deep sleep energy consumption state, the corresponding strategy is: setting the storage time and the shutdown time, and writing the storage time and the shutdown time into the storage flag bit and the shutdown flag bit of the register in the single chip microcomputer in the battery management system respectively.

[0011] As a further improvement of the present invention, before the current power state is switched to the deep sleep energy consumption state, the control method further includes: The actual voltage difference between the battery cells is compared with the set voltage difference. When the actual voltage difference between the battery cells is greater than the set voltage difference, a balancing operation is performed to balance the voltages of the battery cells.

[0012] As a further improvement of the present invention, when the battery management system is in a battery startup state, the control method further includes: Determine whether the battery is started in a normal manner based on a preset rule, wherein the preset rule includes: the battery is started in a normal manner when the current power state is a power-on state and the first preset mark position has a first preset value, or the battery is started in a normal manner when the current power state is a balanced voltage state and the second preset mark position has a second preset value; When the battery is started in a normal manner, a first preset startup strategy is executed.

[0013] As a further improvement of the present invention, The normal mode startup includes: starting by inputting a command, starting by charging the load type, and periodic startup of the single-chip microcomputer; The first preset startup strategy includes: turning on the charging transistor and the discharging transistor respectively, turning off the pre-charging transistor, saving the current system information and status information to the cache, and turning on the log; The cache is deployed on a single-chip microcomputer or on a non-volatile storage medium that is logically independent of the single-chip microcomputer.

[0014] Based on the same inventive concept, the present invention also discloses a battery control device, comprising: A control unit, the control unit being used to obtain a minimum cell voltage value in each cell of the battery in response to a battery shutdown event; Comparing the minimum cell voltage value with the first set voltage value; When the minimum cell voltage value is greater than the first set voltage value, obtaining a maximum cell voltage value in each cell of the battery, and comparing the maximum cell voltage value with the second set voltage value; When the maximum cell voltage value is less than or equal to the second set voltage value, comparing the maximum cell voltage value with a third set voltage value; When the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is in long-term dormancy under a low energy consumption strategy; The second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

[0015] Based on the same inventive concept, the present invention further discloses an energy storage device, comprising: at least one battery configured with a battery management system, and the battery management system executes the power state control method as described in any one of the above items.

[0016] Based on the same inventive concept, the present invention further discloses a computer-readable medium, wherein the computer-readable medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the power state control method as described in any one of the above items is executed.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the battery management system responds to the battery shutdown event, obtains the minimum cell voltage value in each battery cell, and compares the minimum cell voltage value with the first set voltage value, and obtains the maximum cell voltage value in each battery cell, and compares the maximum cell voltage value with the second set voltage value and the third set voltage value respectively. After the conditions are met (that is, the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is less than or equal to the second set voltage value and greater than the third set voltage value), the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is dormant for a long time under a low energy consumption strategy, thereby reducing the energy consumption of the battery during long-term storage, reducing the self-discharge of the battery, avoiding over-discharge, and ultimately avoiding problems such as cell spontaneous combustion and cell over-discharge during long-term storage of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the steps of a method for controlling a power state according to the present invention; Figure 2 for Figure 1 The specific flow chart of step S4 shown; Figure 3 A topological diagram of a battery control device shown in the present invention; Figure 4 A topological diagram of the energy storage device shown in the present invention; Figure 5 A topological diagram of a computer-readable medium according to the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0020] Please refer to Figure 1 and Figure 2As shown, the present invention shows a specific implementation method of a power state control method (hereinafter referred to as "control method"), which is applied to a battery management system for controlling multiple battery cells in a battery. The specific application scenario is to control the current power state of the battery during long-term storage, and further control the charging and discharging of the battery, so as to avoid problems such as spontaneous combustion of the battery cell and over-discharge of the battery cell.

[0021] Ginseng Figure 1 As shown, the control method includes the following steps S1 and S4.

[0022] Step S1, responding to a battery shutdown event.

[0023] Step S4 specifically includes the following steps S41 to S44.

[0024] Step S41, obtaining the minimum cell voltage value of each cell of the battery, and comparing the minimum cell voltage value with a first set voltage value.

[0025] Step S42: when the minimum cell voltage value is greater than the first set voltage value, obtain the maximum cell voltage value in each cell of the battery, and compare the maximum cell voltage value with the second set voltage value.

[0026] Step S43: when the maximum cell voltage value is less than or equal to the second set voltage value, compare the maximum cell voltage value with the third set voltage value.

[0027] Step S44: When the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is dormant for a long time under a low energy consumption strategy.

[0028] The second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

[0029] In the present invention, the battery management system (ie, Figure 4The BMS301 in the battery management system responds to the battery shutdown event, obtains the minimum cell voltage value in each cell of the battery (that is, the cells 31 to 3n included in the battery 302), and compares the minimum cell voltage value with the first set voltage value, and obtains the maximum cell voltage value in each cell of the battery, and compares the maximum cell voltage value with the second set voltage value and the third set voltage value respectively. After the conditions are met (that is, the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is less than or equal to the second set voltage value and greater than the third set voltage value), the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is dormant for a long time under a low energy consumption strategy, thereby reducing the energy consumption of the battery during long-term storage, reducing the self-discharge of the battery, avoiding over-discharge, and ultimately avoiding problems such as cell spontaneous combustion and cell over-discharge during long-term storage of the battery.

[0030] It should be noted that the aforementioned minimum cell voltage value refers to the minimum value of the cell voltage values ​​corresponding to each cell contained in the battery, and accordingly, the maximum cell voltage value refers to the maximum value of the cell voltage values ​​corresponding to each cell contained in the battery. Assuming that the battery contains 14 cells, obtaining the minimum cell voltage value and obtaining the maximum cell voltage value in each cell of the battery include: detecting the cell voltage values ​​corresponding to the 14 cells contained in the battery, obtaining 14 cell voltage values, taking the minimum value of the 14 cell voltage values ​​as the minimum cell voltage value, and taking the maximum value of the 14 cell voltage values ​​as the maximum cell voltage value.

[0031] In one embodiment, the first set voltage value is set based on the cut-off voltage value, which can be set to 3.0V according to the battery manufacturer's recommendation; the second set voltage value is set based on the storage voltage value corresponding to the battery power percentage, which can be set to 3.85V according to the voltage estimation value corresponding to 60% of the battery power percentage; the third set voltage value is similar to the first set voltage value, which can be set to 3.3V according to the battery manufacturer's recommendation. In short, when the minimum cell voltage value in each battery cell is greater than 3.0V, and the maximum cell voltage value in each battery cell is less than or equal to 3.85V and greater than 3.3V, the battery management system switches the current power state to the long-term storage energy consumption state, so that the battery can sleep for a long time under the low energy consumption strategy.

[0032] In one embodiment, Figure 1 As shown, after responding to the battery shutdown event, the following steps S2 are included.

[0033] Step S2: Determine the shutdown mode corresponding to the battery shutdown event.

[0034] The shutdown mode includes an input command mode and a command generation mode. In the present invention, the input command mode refers to the user directly sending a command to the battery management system, for example, the user controls the battery management system to shut down by pressing a button; the command generation mode refers to the command generated by the battery management system when the set conditions are met, for example, the battery management system can automatically shut down after the battery is removed from the charger for 5 seconds, etc. This embodiment does not limit the specific implementation methods corresponding to the input command mode and the command generation mode.

[0035] When the shutdown mode corresponding to the battery shutdown event is the instruction generation mode, the minimum cell voltage value of each battery cell is obtained, and the minimum cell voltage value is compared with the first set voltage value (that is, the steps included in the aforementioned step S4 are executed).

[0036] In one embodiment, Figure 1 As shown, when the shutdown mode corresponding to the battery shutdown event is the input command mode, step S3 is executed, and step S3 specifically includes the following steps S31 to S33.

[0037] Step S31, when the current power state is on, determine whether the current power state is a long-term storage energy consumption state and the trigger flag is not triggered; if so, execute step S32; if not, execute step S33.

[0038] Step S32: When two input instructions are received, the single chip microcomputer in the battery management system is restarted to restart the battery, and the trigger flag is switched to a trigger state.

[0039] Step S33, shut down.

[0040] It should be noted that when the shutdown mode corresponding to the battery shutdown event is the input command mode, and when the current power state is on, it is determined whether the battery management system is in the long-term storage energy consumption state and the trigger flag is in the untriggered state (that is, the content in the aforementioned step S31). If only one input command is received, there is no response. Only when two input commands are received, the microcontroller in the battery management system is restarted to restart the battery, and the trigger flag is switched to the triggered state. This prevents the situation where the battery management system receives two input commands and then receives one input command instead of shutting down when it is in the long-term storage energy consumption state (that is, the trigger flag is in the triggered state). At this time, it will shut down normally.

[0041] In short, in the present invention, the battery management system first responds to a battery shutdown event (i.e., step S1), then determines the shutdown mode corresponding to the battery shutdown event (i.e., step S2, the shutdown mode includes an input instruction mode and an instruction generation mode), and finally executes the corresponding strategy according to the shutdown mode (i.e., step S3 and step S4, step S3 is executed when the shutdown mode is the input instruction mode, and step S4 is executed when the shutdown mode is the instruction generation mode), thereby executing the corresponding strategy according to different shutdown modes to achieve control of battery shutdown under different circumstances.

[0042] In one embodiment, the power state further includes: a deep sleep energy consumption state. When the minimum cell voltage value is greater than the first set voltage value and the maximum cell voltage value is greater than the second set voltage value, the battery management system switches the current power state to the deep sleep energy consumption state.

[0043] When the current power state is the long-term storage energy consumption state, the corresponding strategy is: set the shutdown time, clear the storage flag of the register in the microcontroller in the battery management system, and write the shutdown time into the shutdown flag of the register.

[0044] When the current power state is the deep sleep energy consumption state, the corresponding strategy is: set the storage time and the shutdown time, and write the storage time and the shutdown time into the storage flag bit and the shutdown flag bit of the register in the microcontroller in the battery management system respectively.

[0045] In one embodiment, before the current power state is switched to the deep sleep energy consumption state, the control method further includes: comparing the actual voltage difference value between each battery cell with the set voltage difference value, and when the actual voltage difference value between each battery cell is greater than the set voltage difference value, performing a balancing operation to balance the voltage of each battery cell. Before the current power state is switched to the deep sleep energy consumption state, the battery cells are balanced to ensure the consistency of the voltage between each battery cell, thereby improving the performance, safety and life of the battery, so as to further effectively control the battery during long-term storage.

[0046] Specifically, Figure 2 As shown, the aforementioned step S4 specifically includes the following steps S50 to S59.

[0047] Step S50, obtaining the minimum cell voltage value of each cell of the battery.

[0048] Step S51, determine whether the minimum cell voltage value is less than or equal to the first set voltage value; if so, execute step S52; if not, execute step S53.

[0049] Step S52: The battery management system switches the current power state to a shutdown state.

[0050] Step S53, obtaining the maximum cell voltage value of each cell of the battery.

[0051] Step S54, determine whether the maximum cell voltage value is less than or equal to the second set voltage value; if so, execute step S55; if not, execute step S56.

[0052] Step S55, determining whether the maximum cell voltage value is less than or equal to the third set voltage value; if so, executing step S57; if not, executing step S58.

[0053] Step S56, setting the storage time and the shutdown time, and writing the storage time and the shutdown time into the storage flag and the shutdown flag of the register in the single-chip microcomputer in the battery management system respectively. On the basis of the voltage balance of each battery cell of the current power supply (no balancing operation is required), and when the battery management system is less than the storage time from the moment of setting the storage time to the current moment, the battery management system switches the current power state to the deep sleep energy consumption state.

[0054] Step S57: The battery management system switches the current power state to the shutdown state and clears the storage flag.

[0055] Step S58, setting the shutdown time, clearing the storage flag of the register in the single-chip microcomputer in the battery management system, and writing the shutdown time into the shutdown flag of the register, and the battery management system switches the current power state to the long-term storage energy consumption state.

[0056] Step S59, turn off the transistor and the light respectively, save the current system information and status information to the cache, stop recording logs, and clear the load type flag bit of the register in the single-chip microcomputer.

[0057] Based on this, by comparing the minimum cell voltage value in each battery cell with the first set voltage value, and comparing the maximum cell voltage value with the second set voltage value and the third set voltage value respectively, after the corresponding conditions are met, the current power state is switched to a different power state, and the corresponding strategy is executed to maintain the battery based on the state of each battery cell to avoid problems such as battery cell spontaneous combustion and battery cell over-discharge. In short, when the minimum cell voltage value is less than or equal to the first set voltage value, the battery management system switches the current power state to the shutdown state; when the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is greater than the second set voltage value, the power management system switches the current power state to the deep sleep energy consumption state; when the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is less than or equal to the second set voltage value, and the maximum cell voltage value is less than or equal to the third set voltage value, the power management system switches the current power state to the shutdown state; when the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is less than or equal to the second set voltage value, and the maximum cell voltage value is greater than the third set voltage value, the power management system switches the current power state to the long-term storage energy consumption state.

[0058] It should be noted that when in different power states, the battery management system and the single-chip microcomputer in the battery management system correspond to the state. In the present invention, when the current power state is the shutdown state, the battery management system enters sleep, the single-chip microcomputer in the battery management system is powered off, and no data processing is performed; when the current power state is the deep sleep energy consumption state or the long-term storage energy consumption state, the battery management system enters sleep, and the single-chip microcomputer in the battery management system enters sleep, and data processing can be performed when the corresponding pin is triggered, and the sleep time corresponding to the deep sleep energy consumption state when the current power state is the long-term storage energy consumption state is less than the sleep time corresponding to the long-term storage energy consumption state. For example, the sleep time corresponding to the deep sleep energy consumption state is 5 days, and the sleep time corresponding to the long-term storage energy consumption state is 30 days.

[0059] In one embodiment, when the battery management system is in a battery startup situation, the control method further includes: judging whether the battery is started in a normal manner based on a preset rule; when the battery is started in a normal manner (i.e., if yes), executing a first preset startup strategy; when the battery is started in an abnormal manner (i.e., if no), executing a second preset startup strategy. The preset rules include: when the current power state is a startup state and the first preset mark position has a first preset value, the battery is started in a normal manner, or when the current power state is a balanced voltage state and the second preset mark position has a second preset value, the battery is started in a normal manner.

[0060] It should be noted that, in the present invention, the first preset flag refers to the flag reached at the first set time, which may be, for example, 5 days, and may be specifically limited according to the actual application scenario; the second preset flag refers to the abnormal start flag. At the same time, the first preset value refers to 0; the second preset value refers to 1.

[0061] Specifically, when the current power state is the power-on state and the first preset flag (i.e., the flag when the first set time is reached) is set to 0, or when the current power state is the balanced voltage state and the second preset flag (i.e., the abnormal startup flag) is set to 1, it is determined that the battery is started in an abnormal manner. Otherwise, it is determined that the battery is started in a normal manner.

[0062] Among them, normal startup includes: startup by input command, startup by charger mode with load type, and periodic startup of single-chip microcomputer. The startup by input command is similar to the aforementioned shutdown mode by input command mode, which means that the user directly issues commands to the battery management system, for example, the user controls the battery management system to start up by pressing a button. The startup by charger mode with load type means that the battery is automatically awakened when it is placed on the charger. The periodic startup of single-chip microcomputer means that when the battery is in the shutdown state, the real-time alarm clock of the register in the single-chip microcomputer wakes up for a set time (for example, 10s) every set time (for example, four hours) to detect the battery status.

[0063] In one embodiment, the first preset startup strategy includes: turning on the charging transistor and the discharging transistor respectively, turning off the pre-charging transistor, saving the current system information and status information to the cache, and starting the log; the second preset startup strategy includes: turning on the charging transistor and the discharging transistor respectively, turning off the pre-charging transistor, saving the current system information and status information to the cache, setting the abnormal startup flag position of the register in the single-chip microcomputer to 1, and starting the log. Among them, the cache is deployed in the single-chip microcomputer or in a non-volatile storage medium independent of the single-chip microcomputer, the system information includes time, software version number and hardware version number, etc., and the status information includes the number of pre-charging successes and the number of pre-charging failures.

[0064] In summary, in the present invention, when the battery is turned on, different strategies of initialization are implemented for the battery according to different startup modes (i.e., including normal startup and abnormal startup); when the battery is turned off, different strategies of state switching are implemented for the battery according to different shutdown modes. Thus, during long-term storage, the battery can be regularly powered on and off to manage the charging and discharging and power supply status of the battery, thereby avoiding problems such as spontaneous combustion of the battery cell and over-discharge of the battery cell, so as to achieve the purpose of maintaining the entire storage cycle of the battery.

[0065] Based on the same inventive concept, the present invention also discloses a battery control device 200, which includes: a control unit 201, the control unit 201 is used to respond to the battery shutdown event, obtain the minimum cell voltage value in each battery cell, compare the minimum cell voltage value with the first set voltage value, and when the minimum cell voltage value is greater than the first set voltage value, obtain the maximum cell voltage value in each battery cell, and compare the maximum cell voltage value with the second set voltage value, when the maximum cell voltage value is less than or equal to the second set voltage value, compare the maximum cell voltage value with the third set voltage value, when the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is in long-term dormancy under a low energy consumption strategy. Wherein, the second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

[0066] It should be noted that step S1 and step S4 in the aforementioned control method are implemented by the control unit 201 in the battery control device 200 , and the specific solution can be found in the above description, which will not be described again here.

[0067] Based on the same inventive concept, the present invention also discloses an energy storage device 300, which includes: at least one battery 302 equipped with a battery management system (ie, BMS301), and the battery management system executes the steps in the aforementioned control method. Battery 302 can generally be regarded as a power battery, and is composed of multiple battery cells, such as battery cells 31 to 3n, wherein the parameter n is a positive integer greater than or equal to two. All battery cells are electrically connected in series or in parallel, so that the battery 302 is managed by BMS301. This embodiment has the same technical solutions as those in the aforementioned embodiments, which are described above and will not be repeated here.

[0068] Based on the same inventive concept, the present invention further discloses a computer-readable medium 400 , in which a computer program instruction 401 is stored. When the computer program instruction 401 is read and executed by a processor 402 , the steps in the control method disclosed above are executed.

[0069] Optionally, the computer readable medium 400 may be configured as a server, and the server runs on a physical device for building a private cloud, a hybrid cloud, or a public cloud. At the same time, the computer readable medium 400 may also be configured as a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc.

[0070] The computer readable medium 400 is used to store programs, and the processor 402 executes the steps of the control method disclosed above after receiving the execution instruction.

[0071] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0072] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for controlling a power state is applied to a battery management system for controlling multiple cells in a battery, characterized in that: The control method comprises: In response to a battery shutdown event, the shutdown mode corresponding to the battery shutdown event includes an input instruction mode and an instruction generation mode; When the shutdown mode corresponding to the battery shutdown event is the instruction generation mode, obtaining the minimum cell voltage value of each cell of the battery; Comparing the minimum cell voltage value with the first set voltage value; When the minimum cell voltage value is greater than the first set voltage value, obtaining a maximum cell voltage value in each cell of the battery, and comparing the maximum cell voltage value with the second set voltage value; When the maximum cell voltage value is less than or equal to the second set voltage value, comparing the maximum cell voltage value with a third set voltage value; When the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is in long-term dormancy under a low energy consumption strategy; The shutdown mode corresponding to the battery shutdown event is the input command mode, and the current power state is the on state, the current power state is the long-term storage energy consumption state and the trigger flag is the untriggered state, and when two input commands are received, the single-chip microcomputer in the battery management system is restarted to restart the battery, and the trigger flag is switched to the triggered state; The second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

2. The control method according to claim 1, characterized in that: After the battery shutdown event is responded to, the method includes: Determine a shutdown mode corresponding to the battery shutdown event.

3. The control method according to claim 2, characterized in that: The control method further comprises: When the shutdown mode corresponding to the battery shutdown event is the input command mode, and when the current power state is the on state, determining whether the current power state is the long-term storage energy consumption state and the trigger flag is in the untriggered state; If not, shut down.

4. The control method according to any one of claims 1 to 3, characterized in that: The power supply state also includes: deep sleep energy consumption state; When the minimum cell voltage value is greater than the first set voltage value, and the maximum cell voltage value is greater than the second set voltage value, the battery management system switches the current power state to a deep sleep energy consumption state; When the current power state is a long-term storage energy consumption state, the corresponding strategy is: setting a shutdown time, clearing the storage flag bit of the register in the single-chip microcomputer in the battery management system, and writing the shutdown time into the shutdown flag bit of the register; When the current power state is the deep sleep energy consumption state, the corresponding strategy is: setting the storage time and the shutdown time, and writing the storage time and the shutdown time into the storage flag bit and the shutdown flag bit of the register in the single chip microcomputer in the battery management system respectively.

5. The control method according to claim 4, characterized in that: Before the current power state is switched to the deep sleep energy consumption state, the control method further includes: The actual voltage difference between the battery cells is compared with the set voltage difference. When the actual voltage difference between the battery cells is greater than the set voltage difference, a balancing operation is performed to balance the voltages of the battery cells.

6. The control method according to any one of claims 1 to 3, characterized in that: When the battery management system is in the battery startup state, the control method further comprises: Determine whether the battery is started in a normal manner based on a preset rule, wherein the preset rule includes: the battery is started in a normal manner when the current power state is a power-on state and the first preset mark position has a first preset value, or the battery is started in a normal manner when the current power state is a balanced voltage state and the second preset mark position has a second preset value; When the battery is started in a normal manner, a first preset startup strategy is executed.

7. The control method according to claim 6, characterized in that: The normal mode startup includes: starting by inputting a command, starting by charging the load type, and periodic startup of the single-chip microcomputer; The first preset startup strategy includes: turning on the charging transistor and the discharging transistor respectively, turning off the pre-charging transistor, saving the current system information and status information to the cache, and turning on the log; The cache is deployed on a single-chip microcomputer or on a non-volatile storage medium that is logically independent of the single-chip microcomputer.

8. A battery control device, characterized in that include: A control unit, the control unit being used to obtain a minimum cell voltage value in each cell of the battery in response to a battery shutdown event; Comparing the minimum cell voltage value with the first set voltage value; When the minimum cell voltage value is greater than the first set voltage value, obtaining a maximum cell voltage value in each cell of the battery, and comparing the maximum cell voltage value with the second set voltage value; When the maximum cell voltage value is less than or equal to the second set voltage value, comparing the maximum cell voltage value with a third set voltage value; When the maximum cell voltage value is greater than the third set voltage value, the battery management system switches the current power state to a long-term storage energy consumption state, so that the battery is in long-term dormancy under a low energy consumption strategy; The second set voltage value is greater than the third set voltage value, and the first set voltage value is less than the third set voltage value.

9. An energy storage device, characterized in that: include: At least one battery is equipped with a battery management system, wherein the battery management system executes the power state control method according to any one of claims 1 to 7.

10. A computer readable medium, characterized in that The computer readable medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the power state control method according to any one of claims 1 to 7 is executed.

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