CN114498861A

CN114498861A - Control method, device, equipment and storage medium of battery management system

Info

Publication number: CN114498861A
Application number: CN202210323641.5A
Authority: CN
Inventors: 谢敏杰; 李万宝; 吴志忠; 曾鸣
Original assignee: CETHIK Group Ltd
Current assignee: CETHIK Group Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-05-13

Abstract

The application discloses a control method, a control device, equipment and a storage medium of a battery management system, wherein the method comprises the following steps: acquiring target allowable output power of a battery pack in the battery management system; acquiring initial request power of a target load corresponding to the battery pack under the condition that the target allowable output power is greater than or equal to a preset power threshold; determining a target requested power for the target load based on the target allowable output power if the initial requested power is greater than the target allowable output power; the battery management system is controlled to discharge with the target request power, the target request power of a target load is determined based on the target allowable output power, the output power of the battery management system is further adjusted, and real-time closed-loop response between a battery pack and the target load in the battery management system is further achieved; the reliability and the intellectualization of the battery management system are improved.

Description

Control method, device, equipment and storage medium of battery management system

Technical Field

The present disclosure relates to the field of battery management systems, and in particular, to a method, an apparatus, a device and a storage medium for controlling a battery management system.

Background

The power battery is widely used for electric power tools such as electric automobiles, electric motorcycles, electric power-assisted vehicles, electric forklifts and the like. The current power battery management system deals with different battery working conditions and load requests, and the specific corresponding output of the power battery management system only has two conditions of on and off, namely the output power of the battery cannot be limited according to different system working conditions; so that the energy utilization rate is low.

Disclosure of Invention

In order to solve the technical problem, the application discloses a control method of a battery management system, which determines target request power of a target load based on target allowable output power under the condition that the target allowable output power of a battery pack is greater than the request power of the target load, so as to adjust the output power of the battery management system and further realize real-time closed-loop response between the battery pack and the target load in the battery management system; the reliability and the intellectualization of the battery management system are improved.

In order to achieve the above object, the present application provides a method for controlling a battery management system, the method including:

acquiring target allowable output power of a battery pack in the battery management system;

acquiring initial request power of a target load corresponding to the battery pack under the condition that the target allowable output power is greater than or equal to a preset power threshold;

determining a target requested power for the target load based on the target allowable output power if the initial requested power is greater than the target allowable output power;

and controlling the battery management system to discharge at the target requested power.

In some embodiments, the battery management system includes a target load system corresponding to the target load, and the determining the target requested power of the target load based on the target allowable output power if the initial requested power is greater than the target allowable output power includes:

transmitting the target allowable output power to the target load system in a case where the initial requested power is greater than the target allowable output power;

receiving the target requested power of the target load fed back by the target load system based on the target allowable output power.

In some embodiments, the obtaining the target allowable output power of the battery pack in the battery management system includes:

acquiring voltage information, current information and temperature information of the battery pack at the current moment;

determining the current charge information, the battery health state information, the temperature deviation degree information and the corresponding fault grade information based on at least one of the voltage information, the current information and the temperature information;

and determining the target allowable output power of the battery pack according to the voltage information, the charge amount information, the battery health state information, the temperature deviation degree information and the fault grade information.

In some embodiments, the determining the current charge information, the battery health information, the temperature deviation degree information and the corresponding fault level information based on at least one of the voltage information, the current information and the temperature information includes:

determining the battery health state information at the current moment based on the voltage information, the current information and a first preset processing model under the condition that the working state corresponding to the current moment is that the battery pack is in the charging completion state of the preset full charge-discharge mode;

determining the charge information at the current moment based on the voltage information, the current information and a second preset processing model under the condition that the working state corresponding to the current moment is that the battery pack is in a charging state or a discharging state;

determining the charge information at the current moment according to the voltage information, the temperature information and a third preset processing model under the condition that the working state corresponding to the current moment is that the battery pack is in an open circuit state;

determining the temperature deviation degree information of the current moment based on the temperature information;

determining the fault level information at the present time based on the voltage information, the current information, and the temperature information.

In some embodiments, the determining the battery state of health information at the current time based on the voltage information, the current information, and a first preset process model includes:

determining a monitoring time interval of the battery pack, initial charge capacity information of the battery pack at the charging starting moment, termination charge capacity information of the charging finishing moment and initial capacity information of the battery pack based on the first preset processing model;

determining the battery health status information at the current moment based on the voltage information, the current information, the monitoring time interval, the initial charge amount information, the termination charge amount information, and the initial capacity information.

In some embodiments, the determining the charge information at the current time based on the voltage information, the current information and a second preset processing model includes:

determining previous charge capacity information of the battery pack at a previous moment, battery health state information of the battery pack at the current moment, initial capacity information of the battery pack and a monitoring time interval of the battery pack based on the second preset processing model; the previous moment and the current moment differ by the monitoring time interval;

determining the charge amount information at the present time based on the voltage information, the current information, the previous charge amount information, the battery health state information, the initial capacity information, and the monitoring time interval.

In some embodiments, said determining said fault class information for said present time based on said voltage information, said current information and said temperature information comprises:

determining a first fault level corresponding to the voltage information according to the voltage information and preset fault level information;

determining a second fault level corresponding to the current information according to the current information and preset fault level information;

determining a third fault level corresponding to the temperature information according to the temperature information and preset fault level information;

and determining the fault level information at the current moment according to the first fault level, the second fault level and the third fault level.

In some embodiments, after the obtaining the target allowable output power of the battery pack in the battery management system, the method further comprises:

and controlling the battery management system to enter a preset power-off protection state under the condition that the target allowable output power is smaller than the preset power threshold.

In some embodiments, after the obtaining of the initial requested power of the target load corresponding to the battery pack, the method further includes:

controlling the battery management system to discharge at the initial requested power in a case where the initial requested power is less than or equal to the target allowable output power.

In some embodiments, said controlling said battery management system to discharge at said target requested power comprises:

acquiring a target duty ratio corresponding to the target request power;

and controlling a discharge field effect transistor in the battery management system to discharge at the target duty ratio.

The present application also provides a control device of a battery management system, the device including:

the first acquisition module is used for acquiring target allowable output power of a battery pack in the battery management system;

the second obtaining module is used for obtaining the initial request power of the target load corresponding to the battery pack under the condition that the target allowable output power is greater than or equal to a preset power threshold;

a determination module, configured to determine a target requested power of the target load based on the target allowable output power if the initial requested power is greater than the target allowable output power;

and the control module is used for controlling the battery management system to discharge with the target requested power.

The application also provides a control device of a battery management system, the device comprises a processor and a memory, wherein at least one instruction or at least one program is stored in the memory, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the control method of the battery management system.

The present application also provides a computer-readable storage medium, in which at least one instruction or at least one program is stored, and the at least one instruction or the at least one program is loaded by a processor and executes the control method of the battery management system as described above.

The embodiment of the application has the following beneficial effects:

according to the control method of the battery management system, under the condition that the target allowable output power of the battery pack is larger than the request power of the target load, the target request power of the target load is determined based on the target allowable output power, so that the output power of the battery management system is adjusted, and the real-time closed-loop response between the battery pack and the target load in the battery management system is further realized; the reliability and the intellectualization of the battery management system are improved.

Drawings

In order to more clearly illustrate the control method, apparatus, device and storage medium of the battery management system described in the present application, the drawings required for the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of an implementation environment of control of a battery management system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a battery management system according to an embodiment of the present disclosure.

Fig. 3 is a detailed architecture diagram of a battery management system according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a control method of a battery management system according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a method for determining a target allowable output power according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of a method for determining battery state of health information according to an embodiment of the present disclosure;

fig. 7 is a schematic flowchart of a method for determining charge capacity information according to an embodiment of the present disclosure;

fig. 8 is a schematic flowchart of a method for determining fault level information according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a control device of a battery management system according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, a schematic diagram of an implementation environment provided by an embodiment of the present application is shown, where the implementation environment may include:

at least one terminal 01 and at least one server 02. The at least one terminal 01 and the at least one server 02 may perform data communication through a network.

In an alternative embodiment, the terminal 01 may be an executor of a control method of the battery management system. Terminal 01 may include, but is not limited to, vehicle terminals, smart phones, desktop computers, tablet computers, laptop computers, smart speakers, digital assistants, Augmented Reality (AR)/Virtual Reality (VR) devices, smart wearable devices, and other types of electronic devices. The operating system running on terminal 01 may include, but is not limited to, an android system, an IOS system, linux, windows, Unix, and the like.

The server 02 may provide the terminal 01 with a preset power threshold. Optionally, the server 02 may be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing basic cloud computing services such as a cloud service, a cloud database, cloud computing, a cloud function, cloud storage, a Network service, cloud communication, a middleware service, a domain name service, a security service, a CDN (Content Delivery Network), a big data and artificial intelligence platform, and the like.

Please refer to fig. 2, which is a schematic structural diagram of a battery management system corresponding to a control method of the battery management system according to an embodiment of the present application; the system comprises a battery pack monitoring module 03, a central control processing module 04, a charge and discharge control module 05 and an energy consumption load module 06; the central control processing module 04 is in communication connection with the battery pack monitoring module 03 and the energy consumption load module 06 respectively; the battery pack monitoring module 03 is in communication connection with the charge and discharge control module 05.

Optionally, the battery pack monitoring module 03 may be connected to the central control processing module 04 through a reset line, an interrupt line, and a communication line, so as to implement communication between the battery pack monitoring module 03 and the central control processing module 04. The reset wire can be used for resetting the central control processing module 04 after the battery pack is in an abnormal condition; the interrupt line may be used to wake up the central control processing module 04 from sleep mode; the communication lines may be used for signal interaction. The battery pack monitoring module 03 can be connected with the charge and discharge control module 05 through a control line; the battery pack monitoring module 03 may be configured to send a control instruction sent by the central control processing module 04 to the charge and discharge control module 05 through a control line, so that the charge and discharge control module 05 executes control on/off of the charge and discharge field effect transistor.

In some exemplary embodiments, as shown in fig. 3, a detailed architecture diagram of a battery management system provided by the embodiments of the present application is shown; specifically, the following is made.

In this embodiment, the battery pack monitoring module 03 may be configured to obtain voltage information, current information, and temperature information of the battery pack. The battery pack monitoring module 03 can comprise an AFE acquisition chip, a current measuring resistor and at least one battery pack; here, AFE (Active Front End).

Specifically, the battery pack comprises a plurality of groups of battery cells, and the plurality of groups of battery cells are connected in parallel; the positive and negative electrodes of each group of battery cells are connected with the AFE acquisition chip, so that the AFE acquisition chip can monitor the voltage of each group of battery cells in the battery pack. The current measuring resistor is respectively connected with the battery pack and the charge and discharge control module in series; and meanwhile, the two ends of the current measuring resistor are connected with the AFE front-end acquisition chip, so that the AFE front-end acquisition chip can monitor the charging and discharging current of the battery pack.

The charge and discharge control module 05 may include a charge field effect transistor (charge MOS), a discharge field effect transistor (discharge MOS), a charge cathode, a discharge cathode, and a charge and discharge port anode. The charging field effect transistor and the discharging field effect transistor are connected with an AFE acquisition chip in the battery pack monitoring module 03 through control lines. Correspondingly, the input and output states and power of the battery management system can be controlled through the switch of the field effect transistor. Wherein, MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, abbreviated as MOSFET).

In this embodiment, the central control processing module 04 may be configured to obtain a target allowable output power of a battery pack in the battery management system; under the condition that the target allowable output power is larger than or equal to a preset power threshold, acquiring initial request power of a target load in the battery management system; and determining a target requested power for the target load based on the target allowable output power in a case where the initial requested power is greater than the target allowable output power; and controlling the battery management system to discharge at the target requested power.

The central control processing module 04 may include an (MCU, Microcontroller Unit) central processor and a nonvolatile storage Unit; the MCU and the non-volatile memory unit may be connected by a communication line. The MCU is in communication connection with the battery pack monitoring module 03. The nonvolatile memory technology adopted by the nonvolatile memory unit is a technology which can not lose data when the computer is shut down or the computer is shut down suddenly or accidentally.

The central control processing module 04 may further include a communication interface, and the communication interface is in communication connection with the MCU and the energy consumption load module 06, respectively.

The energy consuming load module 06 may include a target load system and a target load; the target load system corresponds to a target load; correspondingly, the target load system may adjust the requested power of the target load based on the target allowable output power of the battery pack transmitted by the central control processing module 04. The target load system is connected with the communication interface of the central control processing module 04. Wherein, the target load system can be a low-voltage control system; the target load may be a high power unit.

In some exemplary embodiments, the battery pack may correspond to a target load. For example, one battery pack may correspond to one target load.

Referring to fig. 4, which is a schematic flow chart illustrating a control method of a battery management system according to an embodiment of the present application, the present specification provides the method operation steps according to the embodiment or the flow chart, but is based on the conventional method; or the inventive process may include additional or fewer steps. The step sequence recited in the embodiment is only one of the execution sequences of many steps, and does not represent the only execution sequence, and the control method of the battery management system may be executed according to the method sequence shown in the embodiment or the drawings. Specifically, as shown in fig. 4, the method includes:

s401, obtaining target allowable output power of a battery pack in the battery management system.

In the embodiment of the present application, the target allowable output power may be a maximum allowable output power of the battery pack at the time of safe operation.

Optionally, when the battery management system is powered on, the target allowable output power of the battery pack in the battery management system may be obtained in real time.

In some exemplary embodiments, battery pack information may be obtained for a current time of the battery pack; and determining the target allowable output power of the battery pack at the current moment according to the battery pack information. The battery pack information may include voltage information, current information, and temperature information.

In one embodiment, the battery pack includes a plurality of operating states during operation; for example, a charging state, a discharging state, an open state, and a preset full charge-discharge mode charge completion state. The preset full charge-discharge mode charge completion state may be a state when the battery pack is charged from SOC equal to 0 to SOC equal to 1. Correspondingly, the working state of the battery pack corresponding to the current moment can be any one of different working states of the battery pack; for example, the charge state, the discharge state, the open state, and the preset full charge-discharge mode charge completion state may be possible. Correspondingly, the battery state information of the battery pack at the current moment can be determined according to the current working state corresponding to the current moment of the battery pack.

S402, acquiring the initial request power of the target load corresponding to the battery pack under the condition that the target allowable output power is greater than or equal to the preset power threshold.

In this embodiment, the preset power threshold may be a power value corresponding to a minimum power of a target load system in the battery management system. The minimum power request of the target load system may refer to a minimum operable power corresponding to a minimum power consumption load in the target load system. The target load may be any energy consuming load in the battery management system; the initial requested power may be a requested power that is first issued in one execution operation on the target load.

In some exemplary embodiments, in a case that the target allowable output power is greater than or equal to a preset power threshold, it may be determined that the target allowable output power of the battery pack at the present time in the battery management system can meet the minimum power consumption requirement; at this time, the battery management system may be controlled to discharge at a preset power threshold; the central control processing module in the battery management system is enabled to monitor the battery pack and the target load in a low power consumption mode all the time; and then the initial request power of the target load corresponding to the battery pack can be obtained in real time.

Further, under the condition that the initial request power is not acquired, the battery management system is controlled to discharge at a preset power threshold.

In other exemplary embodiments, in the case that the target allowable output power is smaller than the preset power threshold, it may be determined that the battery pack in the current battery management system is in a power-down state; the battery management system can be controlled to enter a preset power-off protection state.

In one embodiment, all functions in the discharge MOS in the battery management system and the central control processing module may be controlled to be turned off in the case that the target allowable output power is smaller than the preset power threshold; the battery pack control system is enabled to perform power-off protection and is connected with the charging equipment to charge the battery pack.

In some exemplary embodiments, the initial requested power may be determined based on a user-triggered power request instruction.

In other exemplary embodiments, the initial requested power may be determined based on output power configuration information corresponding to the battery management system.

And S403, determining the target request power of the target load based on the target allowable output power under the condition that the initial request power is larger than the target allowable output power.

In this embodiment, the target requested power may be an output power at which the target load can normally operate in a certain mode.

In some exemplary embodiments, a plurality of working modes of the target load may be obtained, and a target working mode corresponding to the target allowable output power may be determined according to the target allowable output power and each working mode; and determining the output power corresponding to the target working mode as the target request power of the target load. The target operation mode may be an operation mode in which the target allowable output power can meet the operation requirement of the target load among a plurality of operation modes of the target load.

In an embodiment, if the target operating mode does not exist in the plurality of operating modes of the target load, that is, under the condition that it is determined that the target load does not exist in the target operating mode according to the target allowable output power and each operating mode, the target requested power cannot be acquired, and at this time, the battery management system is controlled to discharge in a low power consumption mode, that is, in a preset power threshold.

In further exemplary embodiments, in a case where a target load system corresponding to the target load is included in the battery management system, the target allowable output power is transmitted to the target load system in a case where the initial requested power is greater than the target allowable output power; and receiving the target request power of the target load fed back by the target load system based on the target allowable output power.

In one embodiment, when the target load system receives the target allowable output power, the target load system may obtain a plurality of operating modes of the target load, and determine a target operating mode corresponding to the target allowable output power according to the target allowable output power and each operating mode; and feeding back the output power corresponding to the target working mode as the target request power.

In another embodiment, when the target load system receives the target allowable output power, the target load system may obtain a plurality of operation modes of the target load, and when it is determined that the target operation mode does not exist in the target load according to the target allowable output power and each operation mode, the target load system does not perform feedback of the requested power.

And S404, controlling the battery management system to discharge at the target requested power.

In this embodiment, controlling the battery management system to discharge at the target requested power may represent discharging the discharge system with the target requested power as the output power of the battery management system.

In some example embodiments, a target duty cycle corresponding to the target requested power may be obtained; and controlling a discharge field effect transistor in the battery management system to discharge at the target duty ratio. The duty ratio may refer to a ratio of the energization time period to the total time period in one pulse cycle. The target duty cycle is positively correlated with the target requested power.

In still other exemplary embodiments, the battery management system is controlled to discharge at the initial requested power in a case where the initial requested power is less than or equal to the target allowable output power.

In one embodiment, while controlling the battery management system to discharge at the initial requested power, the target allowable output power may also be fed back to the target load system corresponding to the target load.

In this embodiment, when the target allowable output power of the battery pack is greater than the requested power of the target load, the target requested power of the target load is determined based on the target allowable output power, so that the output power of the battery management system is adjusted, and the real-time closed-loop response between the battery pack and the target load in the battery management system is further realized; the reliability and the intellectualization of the battery management system are improved. In addition, by adopting the method for adjusting the requested power of the target load according to the corresponding target allowable output power of the battery pack in different working states, the optimal output power can be obtained, and the battery pack can be discharged by the output power, so that the service life and the safety of the battery pack can be effectively improved.

In some exemplary embodiments, fig. 5 is a schematic flow chart illustrating a method for determining a target allowable output power according to an embodiment of the present application; the details are as follows.

S501, obtaining voltage information, current information and temperature information of the battery pack at the current moment.

In the embodiment of the present application, it should be noted that the current time may refer to any time during the operation of the battery pack. For example, the current time may be a time when the battery pack is charged in a preset full charge-discharge mode, or any time when the battery pack is in a charged state, or any time when the battery pack is in a discharged state, or any time when the battery pack is in an open state. The pressure information may refer to a voltage value of the battery pack. The current information may refer to a current value of the battery pack. The temperature information may refer to the temperature of the battery pack.

In some exemplary embodiments, the voltage information of the battery pack at the present time may be determined based on the voltage across the battery pack. And determining current information of the battery pack at the current moment based on the currents at the two ends of the current measuring resistor.

And S502, determining the current charge information, the battery health state information, the temperature deviation degree information and the corresponding fault grade information based on at least one of the voltage information, the current information and the temperature information.

In the embodiment of the present application, the charge information may be the remaining capacity of the battery, which may be represented by an SOC value. The battery state of health information may represent the degree of aging of the battery, which may be expressed in SOH values. The temperature deviation degree information may refer to a temperature deviation value. The fault grade information may be a fault grade corresponding to the fault information of the battery pack at the current time, and the ERR may be used_levelTo represent; for example, the fault level may be a low fault level or a high fault level. The fault information may include voltage fault information, current fault information, and temperature fault information. For example, the voltage fault information may include an undervoltage fault, an overvoltage fault, and the like; the current fault information may include a small overcurrent fault, a large overcurrent fault, a short circuit fault, and the like; the temperature fault information may include a charge high temperature fault, a discharge high temperature fault, a charge low temperature fault, and a discharge low temperature fault.

In some exemplary embodiments, when the working state corresponding to the current time is that the battery pack is in the preset full charge-discharge mode charging completion state, the battery health state information at the current time may be determined based on the voltage information, the current information, and a first preset processing model. The first preset processing model may be a calculation model of the battery state of health information, where the calculation model includes a plurality of parameters involved in determining the battery state of health information and an association relationship between the parameters. The first preset processing model may be a model that is preset and stored in the server. The preset full charge-discharge mode charge completion time may be a charge completion time corresponding to when the charge amount of the battery pack is charged from SOC-0 to SOC-1.

In other exemplary embodiments, when the current time is a charging completion time of a non-preset full charge-discharge mode, for example, any time in a charging state, a discharging state, or an open-circuit state, the battery health state information at the previous time is acquired from the server; and determining the battery health state information at the previous moment as the battery health state information at the current moment. The previous moment is a moment before the current moment and different from the current moment by a monitoring time interval.

In some exemplary embodiments, when the working state corresponding to the current time is a charging state or a discharging state of the battery pack, the charge amount information at the current time is determined based on the voltage information, the current information, and a second preset processing model. The second preprocessing model may be a calculation model of the charge amount information, and the calculation model includes a plurality of parameters involved in determining the charge amount information and an association relationship between the parameters. The second preset processing model may be a model that is preset and stored in the server.

In some exemplary embodiments, when the working state corresponding to the current time is that the battery pack is in an open circuit state, the charge amount information at the current time is determined according to the voltage information, the temperature information, and a third preset processing model. The third preset processing model may be a preset temperature-charge characteristic curve. The third preset processing model may be a model that is preset and stored in the server.

In one embodiment, the charge information at the current moment may be determined according to the voltage information, the temperature information, and a preset temperature charge characteristic curve.

In some exemplary embodiments, the temperature deviation degree information at the current time may be determined based on the temperature information.

In one embodiment, rated temperature information of the battery pack is obtained, and temperature deviation degree information at the current moment is determined according to the battery rated temperature information and the temperature information.

Specifically, a rated temperature corresponding to the rated temperature information and a current temperature corresponding to the temperature information are obtained, and an absolute value of a difference between the rated temperature and the current temperature is determined as the temperature deviation degree information.

In some exemplary embodiments, the fault level information at the present time may be determined based on the voltage information, the current information, and the temperature information.

In one embodiment, a low-level fault may be determined as a low-level fault, such as a low-temperature charging fault, a low-temperature discharging fault, and an overvoltage fault. And determining a charging high-temperature fault, a discharging high-temperature fault, a short-circuit fault and the like as high-level faults.

In some exemplary embodiments, the collected voltage information, current information, temperature information, charge information, battery health information, fault level information, and the like of the battery pack are uploaded to a server for storage.

And S503, determining the target allowable output power of the battery pack according to the voltage information, the charge capacity information, the battery health state information, the temperature deviation degree information and the fault level information.

In the embodiment of the application, the target allowable output power at the current moment can be determined according to the voltage information, the charge amount information, the battery health state information, the temperature deviation degree information and the fault level information of the battery pack at the current moment.

In some exemplary embodiments, the rated current of the battery pack may be acquired; and determining the target allowable output power based on the voltage information, the charge capacity information, the battery health state information, the temperature deviation degree information, the fault grade information and the rated current. The rated current may be a rated current of the battery pack at the time of shipment.

Specifically, the target allowable output power may be determined by using a formula corresponding to the model one, as well as voltage information, charge amount information, battery state of health information, temperature deviation degree information, fault level information, and rated current.

Model one:

wherein, P_MAXOUTIndicating target allowable output power, SOC indicating charge information at a point before the point, SOH indicating battery state of health information, Δ Temp indicating temperature deviation degree information, ERR_levelThe method comprises the steps of representing fault grade information, U representing voltage information at the current moment, and I representing rated current of a battery pack; a is a weight coefficient of the charge information, b is a weight coefficient of the battery state of health information, c is a weight coefficient of the temperature deviation degree information, and d is a weight coefficient of the fault grade informationAnd (4) counting.

Correspondingly, the voltage information, the charge capacity information, the battery health state information, the temperature deviation degree information and the fault grade information are substituted into a calculation formula corresponding to the model to obtain the target allowable output power at the current moment.

In the embodiment, the battery state of the battery pack is monitored in real time, and the maximum allowable output power of the battery pack at the current moment is obtained by adopting a nonlinear fitting calculation method of the parameters, so that the accurate maximum allowable output power can be obtained.

In some exemplary embodiments, as shown in fig. 6, a schematic flow chart of a method for determining battery state of health information according to an embodiment of the present application is shown; specific examples are as follows.

S601, based on the first preset processing model, determining a monitoring time interval of the battery pack, initial charge capacity information of the battery pack at the charging starting moment, termination charge capacity information of the charging finishing moment and initial capacity information of the battery pack.

In the embodiment of the present application, the monitoring interval may refer to a length of a minimum period for monitoring the state information of the battery pack. The initial capacity information may be a factory original capacity of the battery pack.

And S602, determining the battery health state information at the current moment based on the voltage information, the current information, the monitoring time interval, the initial charge capacity information, the termination charge capacity information and the initial capacity information.

In this embodiment, the target allowable output power may be determined by using a formula corresponding to the model two, and the voltage information, the current information, the monitoring time interval, the charge amount information, the termination charge amount information, and the initial capacity information.

Model two:

wherein, SOH_TThe battery health state information of the current moment is represented, and T represents the current moment; u represents voltage information during charging, and I represents voltage information during chargingThe current information, CO, SOC-0, and SOC-1 indicate initial charge information at the start of charging and end charge information at the end of charging, respectively.

Correspondingly, the voltage information, the current information, the monitoring time interval, the charge information, the charge termination information and the initial capacity information are substituted into the calculation formula corresponding to the model II to obtain the battery health state information at the current moment.

In this embodiment, the battery health status information at the current moment can be determined in real time according to the real-time voltage information and current information of the battery pack; the battery state of health information at the current moment can be accurately obtained, so that the accuracy of the target allowable output power of the battery pack is improved.

In some exemplary embodiments, as shown in fig. 7, a flowchart of a method for determining charge capacity information according to an embodiment of the present application is shown; specific examples are as follows.

S701, determining previous electric charge information of a battery pack at a previous moment, current battery health state information, initial capacity information of the battery pack and a monitoring time interval of the battery pack based on a second preset processing model; the previous time and the current time differ by the monitoring time interval.

In the embodiment of the present application, the previous time may be a time detected by a monitoring time different from the current time by one monitoring time before the current time; the previous moment and the current moment are two monitoring moments corresponding to adjacent monitoring periods.

Specifically, the current battery state of health information may be the previous battery state of health information obtained from the server.

And S702, determining the current charge capacity information based on the voltage information, the current information, the previous charge capacity information, the battery health state information, the initial capacity information and the monitoring time interval.

In the embodiment of the present application, the charge information may be determined by using a formula corresponding to the model three, and using the voltage information, the current information, the previous charge information, the battery health state information, the initial capacity information, and the monitoring time interval.

And (3) model III:

therein, SOC_TInformation on the amount of charge, SOC, representing the current time_T-1Information on the amount of charge, SOH, representing the previous moment_TThe battery health state information at the current moment is represented, and T represents the current moment; t-1 represents the previous time, U represents voltage information at the time of charging or voltage information at the time of discharging, I represents current information at the time of charging or discharging, and CO represents initial capacity information.

Correspondingly, the voltage information, the current information, the previous charge capacity information, the battery health state information, the initial capacity information and the monitoring time interval are substituted into the calculation formula corresponding to the model III to obtain the charge capacity information at the current moment.

In the embodiment, the real-time charge information of the battery pack can be determined according to the real-time voltage information, the current information and the like of the battery pack; the charge information at the current moment can be accurately obtained, so that the accuracy of the target allowable output power of the battery pack is improved.

In some exemplary embodiments, as shown in fig. 8, a flowchart of a method for determining fault level information according to an embodiment of the present application is shown; specific examples are as follows.

S801, determining a first fault level corresponding to the voltage information according to the voltage information and preset fault level information.

In the embodiment of the present application, the preset fault level information may be preset configuration information for performing level evaluation on the battery state information. The preset fault level information may include a low fault level and a high fault level. Correspondingly, the first fault level may be a low fault level and a high fault level.

In some example embodiments, voltage fault information corresponding to the voltage information may be determined based on the voltage information; and determining a first fault level corresponding to the voltage information from preset fault level information according to the voltage fault information. The voltage fault information may include an undervoltage fault, an overvoltage fault, and the like.

In one embodiment, if the voltage fault information is an under-voltage fault, the first fault level may be determined to be a high level fault. If the voltage fault information is an overvoltage fault, the first fault level may be determined to be a low level fault.

S802, determining a second fault level corresponding to the current information according to the current information and the preset fault level information.

In the embodiment of the present application, the second failure level may be a low failure level and a high failure level.

In some exemplary embodiments, current fault information corresponding to the current information may be determined based on the current information; and determining a second fault level corresponding to the current information from preset fault level information according to the current fault information. The current fault information may include a small overcurrent fault, a large overcurrent fault, a short-circuit fault, and the like.

In one embodiment, if the current fault information is a short circuit fault, the second fault level may be determined to be a high level fault. If the current fault information is a small overcurrent fault or a large overcurrent fault, it may be determined that the second fault level is a low-level fault.

And S803, determining a third fault level corresponding to the temperature information according to the temperature information and the preset fault level information.

In the embodiment of the present application, the third failure level may be a low failure level and a high failure level.

In some exemplary embodiments, temperature fault information corresponding to the temperature information may be determined based on the temperature information; and determining a third fault level corresponding to the temperature information from preset fault level information according to the temperature fault information. The temperature fault information may include a charge high temperature fault, a discharge high temperature fault, a charge low temperature fault, and a discharge low temperature fault, among others.

In one embodiment, if the temperature fault information is a charge high temperature fault or a discharge high temperature fault, it may be determined that the second fault level is a high level fault. If the temperature fault information is a charging low-temperature fault or a discharging low-temperature fault, it may be determined that the third fault level is a low-level fault.

S804, determining the fault level information at the current moment according to the first fault level, the second fault level and the third fault level.

In the embodiment of the application, the first fault level, the second fault level and the third fault level can be subjected to level comparison, and the fault level meeting the preset condition is determined; and determining the fault grade meeting the preset condition as the fault grade information at the current moment.

Optionally, the failure level with the highest level among the first failure level, the second failure level, and the third failure level may be determined as the failure level information at the current time.

In the embodiment, the real-time fault level information of the battery pack can be determined according to the real-time voltage information, the current information and the like of the battery pack; the fault grade information of the current moment can be accurately obtained, so that the accuracy of the target allowable output power of the battery pack is improved.

An embodiment of the present application further provides a control device of a battery management system, as shown in fig. 9, which is a schematic structural diagram of the control device of the battery management system provided in the embodiment of the present application; specifically, the device comprises:

a first obtaining module 901, configured to obtain a target allowable output power of a battery pack in a battery management system;

a second obtaining module 902, configured to obtain an initial request power of a target load corresponding to the battery pack when the target allowable output power is greater than or equal to a preset power threshold;

a determining module 903, configured to determine a target requested power of the target load based on the target allowed output power if the initial requested power is greater than the target allowed output power;

a control module 904 for controlling the battery management system to discharge at the target requested power.

In this embodiment of the application, the battery management system includes a target load system corresponding to the target load, and the determining module 903 includes:

a sending unit, configured to send the target allowed output power to the target load system when the initial requested power is greater than the target allowed output power.

A receiving unit, configured to receive the target requested power of the target load fed back by the target load system based on the target allowed output power.

In this embodiment of the present application, the first obtaining module 901 includes:

the information acquisition module is used for acquiring the voltage information, the current information and the temperature information of the battery pack at the current moment;

the information determining module is used for determining the current charge information, the battery health state information, the temperature deviation degree information and the corresponding fault grade information based on at least one of the voltage information, the current information and the temperature information;

and the power determining module is used for determining the target allowable output power of the battery pack according to the voltage information, the charge quantity information, the battery health state information, the temperature deviation degree information and the fault grade information.

In this embodiment of the present application, the operating state of the battery pack includes a charging state, a discharging state, an open-circuit state, and a charging completion state in a preset full charge-discharge mode, and the information determination module includes:

a first determining unit, configured to determine, based on the voltage information, the current information, and a first preset processing model, the battery health state information at the current time when the working state corresponding to the current time is that the battery pack is in the preset full charge-discharge mode charge completion state;

a second determining unit, configured to determine, based on the voltage information, the current information, and a second preset processing model, the charge amount information at the current time when the working state corresponding to the current time is a state in which the battery pack is in a charging state or a discharging state;

a third determining unit, configured to determine, according to the voltage information, the temperature information, and a third preset processing model, the charge amount information at the current time when the working state corresponding to the current time is that the battery pack is in an open circuit state;

a fourth determination unit configured to determine the temperature deviation degree information at the current time based on the temperature information;

a fifth determination unit configured to determine the fault level information at the present time based on the voltage information, the current information, and the temperature information.

In an embodiment of the present application, the first determining unit includes:

a first determining subunit, configured to determine, based on the first preset processing model, a monitoring time interval of the battery pack, initial charge amount information at a charging start time of the battery pack, termination charge amount information at a charging completion time of the battery pack, and initial capacity information of the battery pack;

a second determining subunit, configured to determine the battery health state information at the current time based on the voltage information, the current information, the monitoring time interval, the initial charge amount information, the termination charge amount information, and the initial capacity information.

In an embodiment of the present application, the second determining unit includes:

a third determining subunit, configured to determine, based on the second preset processing model, previous charge amount information of a previous time of the battery pack, the battery health state information of the current time, initial capacity information of the battery pack, and a monitoring time interval of the battery pack; the previous moment and the current moment differ by the monitoring time interval;

a fourth determining subunit, configured to determine the charge amount information at the current time based on the voltage information, the current information, the previous charge amount information, the battery health state information, the initial capacity information, and the monitoring time interval.

In an embodiment of the present application, the fifth determining unit includes:

the fifth determining subunit is configured to determine, according to the voltage information and preset fault level information, a first fault level corresponding to the voltage information;

the sixth determining subunit is configured to determine, according to the current information and preset fault level information, a second fault level corresponding to the current information;

the seventh determining subunit is configured to determine, according to the temperature information and preset fault level information, a third fault level corresponding to the temperature information;

an eighth determining subunit, configured to determine the fault level information at the current time according to the first fault level, the second fault level, and the third fault level.

In the embodiment of the present application, the method further includes:

and the system control module is used for controlling the battery management system to enter a preset power-off protection state under the condition that the target allowable output power is smaller than the preset power threshold.

In the embodiment of the present application, the method further includes:

and the discharging module is used for controlling the battery management system to discharge at the initial request power under the condition that the initial request power is less than or equal to the target allowable output power.

In the embodiment of the present application, the control module 904 includes:

a duty ratio obtaining unit, configured to obtain a target duty ratio corresponding to the target request power;

and the discharging unit is used for controlling a discharging field effect transistor in the battery management system to discharge at the target duty ratio.

It should be noted that the device and method embodiments in the device embodiment are based on the same inventive concept.

The embodiment of the application provides a control device of a battery management system, the device comprises a processor and a memory, at least one instruction or at least one program is stored in the memory, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the control method of the battery management system according to the method embodiment.

Further, fig. 10 is a schematic diagram of a hardware structure of an electronic device for implementing the control method of the battery management system provided in the embodiment of the present application, where the electronic device may participate in forming or including the control apparatus of the battery management system provided in the embodiment of the present application. As shown in fig. 10, the electronic device 100 may include one or more (shown as 1002a, 1002b, … …, 1002 n) processors 1002 (the processors 1002 may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 1004 for storing data, and a transmission device 1006 for communication functions. Besides, the method can also comprise the following steps: a display, an input/output interface (I/O interface), a Universal Serial Bus (USB) port (which may be included as one of the ports of the I/O interface), a network interface, a power source, and/or a camera. It will be understood by those skilled in the art that the structure shown in fig. 10 is merely illustrative and is not intended to limit the structure of the electronic device. For example, electronic device 100 may also include more or fewer components than shown in FIG. 10, or have a different configuration than shown in FIG. 10.

It should be noted that the one or more processors 1002 and/or other control circuitry of the battery management system described above may be generally referred to herein as "control circuitry of the battery management system. The control circuitry of the battery management system may be embodied in whole or in part as software, hardware, firmware, or any combination thereof. Further, the control circuitry of the battery management system may be a single, stand-alone processing module, or incorporated in whole or in part into any of the other elements in the electronic device 100 (or mobile device). As referred to in the embodiments of the application, the control circuitry of the battery management system is controlled as a processor (e.g., selection of a variable resistance termination path connected to the interface).

The memory 1004 can be used for storing software programs and modules of application software, such as program instructions/data storage devices corresponding to the control method of the battery management system described in the embodiment of the present application, and the processor 1002 executes various functional applications and control of the battery management system by running the software programs and modules stored in the memory 1004, that is, implementing the control method of the battery management system. The memory 1004 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 1004 may further include memory located remotely from the processor 1002, which may be connected to the electronic device 100 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 1006 is used for receiving or sending data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the electronic device 100. In one example, the transmission device 1006 includes a network adapter (NIC) that can be connected to other network devices through a base station so as to communicate with the internet. In one embodiment, the transmission device 1006 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.

The display may be, for example, a touch screen type Liquid Crystal Display (LCD) that may enable a user to interact with a user interface of the electronic device 100 (or mobile device).

Embodiments of the present application further provide a computer-readable storage medium, which may be disposed in an electronic device to store at least one instruction or at least one program for implementing a control method of a battery management system in the method embodiments, where the at least one instruction or the at least one program is loaded and executed by the processor to implement the control method of the battery management system provided in the method embodiments.

Alternatively, in this embodiment, the storage medium may be located in at least one network server of a plurality of network servers of a computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

It should be noted that: the sequence of the embodiments of the present application is only for description, and does not represent the advantages or disadvantages of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

According to an aspect of the application, a computer program product or computer program is provided, comprising computer instructions, the computer instructions being stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the method provided in the various alternative implementations described above.

The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device and electronic apparatus embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of controlling a battery management system, the method comprising:

2. The method according to claim 1, wherein a target load system corresponding to the target load is included in the battery management system, and the determining the target requested power of the target load based on the target allowable output power when the initial requested power is greater than the target allowable output power includes:

3. The control method of a battery management system according to claim 1, wherein the obtaining of the target allowable output power of the battery pack in the battery management system comprises:

4. The method according to claim 3, wherein the operating state of the battery pack includes a charging state, a discharging state, an open state, and a preset full charge-discharge mode charge completion state, and the determining the charge amount information, the battery health state information, the temperature deviation degree information, and the corresponding fault level information at the current time based on at least one of the voltage information, the current information, and the temperature information includes:

determining the charge information at the current moment based on the voltage information, the current information and a second preset processing model under the condition that the working state corresponding to the current moment is the charging state or the discharging state of the battery pack;

5. The method of claim 4, wherein the determining the battery state of health information at the current time based on the voltage information, the current information, and a first preset processing model comprises:

6. The method for controlling a battery management system according to claim 4, wherein the determining the charge amount information at the current time based on the voltage information, the current information and a second preset processing model includes:

7. The control method of the battery management system according to claim 4, wherein the determining the fault level information at the present time based on the voltage information, the current information, and the temperature information includes:

8. The control method of a battery management system according to claim 1, wherein after the obtaining of the target allowable output power of the battery pack in the battery management system, the method further comprises:

9. The method of controlling a battery management system according to claim 1, wherein after the obtaining of the initial requested power of the target load corresponding to the battery pack, the method further comprises:

10. The method for controlling a battery management system according to claim 1, wherein the controlling the battery management system to discharge at the target requested power includes:

acquiring a target duty ratio corresponding to the target request power;

11. A control apparatus for a battery management system, the apparatus comprising:

the second obtaining module is used for obtaining the initial request power of the target load corresponding to the battery pack under the condition that the target allowable output power is larger than or equal to a preset power threshold;

12. A control device of a battery management system, characterized in that the device comprises a processor and a memory, in which at least one instruction or at least one program is stored, which is loaded and executed by the processor to implement the control method of the battery management system according to any one of claims 1 to 10.

13. A computer-readable storage medium, wherein at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded by a processor and executes a control method of a battery management system according to any one of claims 1 to 10.