WO2024050773A1 - Procédé de commande de système de batterie et appareil de commande - Google Patents

Procédé de commande de système de batterie et appareil de commande Download PDF

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Publication number
WO2024050773A1
WO2024050773A1 PCT/CN2022/117884 CN2022117884W WO2024050773A1 WO 2024050773 A1 WO2024050773 A1 WO 2024050773A1 CN 2022117884 W CN2022117884 W CN 2022117884W WO 2024050773 A1 WO2024050773 A1 WO 2024050773A1
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WIPO (PCT)
Prior art keywords
battery
soc
branch
battery system
battery branch
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PCT/CN2022/117884
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English (en)
Chinese (zh)
Inventor
叶炜
李永超
谢吉海
曾波
周康
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宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202280088338.XA priority Critical patent/CN118511340A/zh
Priority to PCT/CN2022/117884 priority patent/WO2024050773A1/fr
Publication of WO2024050773A1 publication Critical patent/WO2024050773A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04225—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during start-up

Definitions

  • the present application relates to the field of battery technology, and in particular to a control method and control device for a battery system.
  • MBMU master battery management unit
  • SBMU slave battery management units
  • MBMU and SBMU communicate with each other.
  • MBMU can obtain the battery's current value, cell voltage, relay status, state of charge (SOC) and other information from SBMU, so that it can perform energy management of the battery system.
  • SOC state of charge
  • the MBMU cannot obtain or cannot accurately obtain the current, cell voltage, relay status, SOC and other information of the battery branch where the SBMU is located, resulting in the inability to accurately determine the SOC of the battery system.
  • the battery system's battery life information cannot be accurately calculated, resulting in the battery system being deactivated, which cannot guarantee user safety and degrades user experience.
  • Embodiments of the present application provide a battery system control method and control device, which can more accurately determine the SOC of the battery system when there is a battery branch with abnormal communication in the battery system, ensuring user safety and improving user experience.
  • a method of controlling a battery system includes: a first battery branch with abnormal communication in the battery system. Next, obtain the current information of the battery system, the current information includes the current information of the main circuit of the battery system and the current information of the battery branches with normal communication in the battery system; according to the current information of the battery system , determine the state of the first battery branch, and the state of the first battery branch includes a closed state or a disconnected state; determine the SOC of the battery system according to the state of the first battery branch.
  • the battery system control scheme provided by the embodiment of the present application can be used based on the obtained current information of the main circuit of the battery system and the battery branch with normal communication in the battery system when there is a first battery branch with abnormal communication.
  • the current information is used to determine the status of the first battery branch, thereby determining the SOC of the battery system based on the status of the first battery branch.
  • the SOC of the battery system can be accurately determined, so that the battery life information of the battery system can be more accurately determined based on the SOC, ensuring user safety and improving user experience.
  • determining the status of the first battery branch according to the current information of the battery system includes: connecting the main circuit of the battery system and the battery branch with normal communication. If the current difference between them is within the preset range, it is determined that the state of the first battery branch is a disconnected state.
  • the battery system control scheme provided by the embodiment of the present application determines the state of the first battery branch based on the current difference between the main circuit of the battery system and the battery branch with normal communication, which can avoid the first battery branch being in a state before communication abnormality.
  • the problem of excessive discharge of other closed battery branches in the battery system caused by the closed state and the disconnected state after communication abnormality improves the performance and service life of the battery system, and can also be more accurate based on the status of the first battery branch
  • the battery life information of the battery system can be calculated more accurately.
  • determining the SOC of the battery system according to the state of the first battery branch includes: when the state of the first battery branch is a disconnected state, The SOC of the battery system is determined based on the SOC of the battery branch with normal communication and the state of the battery branch with normal communication.
  • the SOC of the first battery branch is not included in the calculation when determining the SOC of the battery system. Instead, the calculation is based on the SOC of the closed battery branch among the battery branches with normal communication. In this way, when the first battery branch communication is abnormal, the SOC of the battery system can be determined more accurately, and the battery life information of the battery system can be calculated more accurately, which can avoid excessive discharge of the battery system and improve the performance and user experience of the battery system. .
  • determining the status of the first battery branch according to the current information of the battery system includes: connecting the main circuit of the battery system and the battery branch with normal communication. If the current difference between them is outside the preset range, it is determined that the state of the first battery branch is a closed state.
  • the battery system control scheme provided by the embodiment of the present application determines the state of the first battery branch based on the current difference between the main circuit of the battery system and the battery branch with normal communication, which can avoid the first battery branch being in a state before communication abnormality.
  • the problem of excessive discharge of other closed battery branches in the battery system caused by the closed state and the disconnected state after communication abnormality improves the performance and service life of the battery system.
  • it can also be relatively accurate based on the status of the first battery branch. To accurately determine the SOC of the battery system, the battery life information of the battery system can be calculated more accurately.
  • determining the SOC of the battery system according to the state of the first battery branch includes: when the state of the first battery branch is a closed state, determining The SOC of the first battery branch; determine the SOC of the battery system based on the SOC of the first battery branch, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication.
  • the battery system control scheme provided by the embodiment of the present application can determine the SOC of the first battery branch when the state of the first battery branch is closed, and then incorporate the SOC of the first battery branch into the battery system. SOC calculation. In this way, when the first battery branch communication is abnormal, the SOC of the battery system can be more accurately determined, thereby more accurately calculating the battery life information of the battery system, improving user experience and ensuring user safety.
  • determining the SOC of the first battery branch includes: determining the SOC of the first battery branch based on the SOC of the battery branch with normal communication.
  • the battery system control scheme provided by the embodiment of the present application can accurately determine the SOC of the first battery branch based on the SOC of the battery system with normal communication, so that the SOC of the battery system can be accurately determined.
  • SOC difference before communication abnormality, ⁇ is the safety factor.
  • the battery system control scheme provided by the embodiment of the present application can dynamically adjust the SOC of the first battery branch with abnormal communication based on the SOC of the battery branch with the smallest SOC among the battery branches with normal communication, and also considers the safety factor to avoid SOC. Overestimation. In this way, a more accurate and conservative SOC of the first battery branch can be determined, so that a more accurate and conservative SOC of the battery system can be determined, to avoid over-discharging of the battery system caused by excessive SOC estimation, and to improve the performance and performance of the battery system. service life.
  • the control method before determining the status of the first battery branch according to the current information of the battery system, includes: determining that the current of the main circuit of the battery system is greater than or equal to Preset threshold.
  • the battery system control scheme provided by the embodiment of the present application when it is determined that the current of the main circuit of the battery system is relatively large, can be based on the current information of the main circuit of the battery system and the current information of the battery branches with normal communication in the battery system.
  • the status of the first battery branch with abnormal communication can be determined more accurately, thereby improving the accuracy of the determined SOC of the battery system.
  • control method further includes: when the current of the main circuit of the battery system is less than or equal to the preset threshold, according to the target SOC, the battery branch with normal communication
  • the SOC of the battery system and the state of the battery branch with normal communication determine the SOC of the battery system, and the target SOC is the SOC of the first battery branch.
  • the battery system control scheme provided by the embodiment of the present application can include the SOC of the first battery branch regardless of whether the first battery branch is in a closed state or a disconnected state when the main circuit current of the battery system is relatively small.
  • the SOC of the battery system is being calculated. In this way, the data overhead required to determine the status of the first battery branch can be reduced and energy consumption can be saved.
  • the target SOC is determined based on the SOC of the first battery branch before the communication abnormality.
  • the battery system control scheme provided by the embodiment of the present application can more accurately determine the SOC of the first battery branch when the main circuit current of the battery system is relatively small, improving the accuracy of the determined SOC of the battery system. In this way, the battery life information of the battery system can be accurately calculated and excessive discharge of the battery system can be avoided.
  • the current information of the main circuit of the battery system is collected by a current sampling element in the main circuit of the battery system.
  • the battery system control scheme provided by the embodiment of the present application can accurately obtain the current information of the main circuit based on the current sampling element provided on the main circuit of the battery system, thereby accurately determining the SOC of the battery system.
  • the current information of the battery branch with normal communication is collected by a current sampling element in the battery branch with normal communication.
  • the battery system control scheme provided by the embodiment of the present application can accurately obtain the current information of the battery branch according to the current sampling elements provided on each battery branch of the battery system, thereby improving the determined status of the first battery branch.
  • the accuracy of the battery system is improved, thereby improving the accuracy of the determined SOC of the battery system.
  • the closed or disconnected state of the battery branch in the battery system is controlled by a relay on the battery branch in the battery system.
  • a control device for a battery system includes a plurality of parallel battery branches.
  • the control device includes an acquisition unit for first detecting a communication abnormality in the battery system.
  • obtain the current information of the battery system where the current information includes the current information of the main circuit of the battery system and the current information of the battery branch with normal communication in the battery system; the control unit,
  • the control unit is configured to determine the state of the first battery branch according to the current information of the battery system, and the state of the first battery branch includes a closed state or an open state; the control unit is configured to determine the state of the first battery branch according to the first battery branch.
  • the state of a battery branch determines the state of charge SOC of the battery system.
  • control unit is specifically configured to: when the current difference between the main circuit of the battery system and the battery branch with normal communication is within a preset range, determine The state of the first battery branch is a disconnected state.
  • control unit is specifically configured to: when the status of the first battery branch is a disconnected state, according to the SOC of the battery branch with normal communication and the communication The status of the normal battery branch determines the SOC of the battery system.
  • control unit is specifically configured to: when the current difference between the main circuit of the battery system and the battery branch with normal communication is outside a preset range, determine The state of the first battery branch is a closed state.
  • control unit is specifically configured to: when the state of the first battery branch is a closed state, determine the SOC of the first battery branch; according to the first The SOC of the battery branch, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication determine the SOC of the battery system.
  • control unit is specifically configured to determine the SOC of the first battery branch according to the SOC of the battery branch with normal communication.
  • control unit is further configured to determine that the current of the main circuit of the battery system is greater than or equal to a preset threshold.
  • control unit is further configured to: when the current of the main circuit of the battery system is less than or equal to the preset threshold, according to the target SOC, the normal communication battery support The SOC of the battery branch and the status of the battery branch with normal communication determine the SOC of the battery system, and the target SOC is the SOC of the first battery branch.
  • the target SOC is determined based on the SOC of the first battery branch before the communication abnormality.
  • the current information of the main circuit of the battery system is collected by a current sampling element in the main circuit of the battery system.
  • the current information of the battery branch with normal communication is collected by a current sampling element in the battery branch with normal communication.
  • the closed or disconnected state of the battery branch in the battery system is controlled by a relay on the battery branch in the battery system.
  • a battery system in a third aspect, includes a plurality of parallel battery branches and a control device as described in the second aspect and any possible implementation of the second aspect.
  • a control device for a battery system includes a memory and a processor.
  • the memory is used to store instructions.
  • the processor is used to read the instructions and execute the first step according to the instructions. Aspect and the method described in any possible implementation manner of the first aspect.
  • a computer-readable storage medium is provided.
  • the computer-readable storage medium is used to store a computer program.
  • the computer program causes the computer to execute the first aspect and any possible implementation of the first aspect. the method described in .
  • a computer program product includes computer program instructions.
  • the computer program instructions cause the computer to execute the method described in the first aspect and any possible implementation of the first aspect. .
  • a chip in a seventh aspect, includes a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the first aspect and any possible implementation thereof. The method described in the method.
  • An eighth aspect provides a computer program, characterized in that the computer program causes the computer to execute the method described in the first aspect and any possible implementation of the first aspect.
  • Figure 1 is a schematic structural diagram of a battery system applicable to the embodiment of the present application.
  • FIG. 2 is a schematic flow chart of a battery system control method provided by an embodiment of the present application.
  • FIG. 3 is another schematic flow chart of the control method of the battery system provided by the embodiment of the present application.
  • FIG. 4 is another schematic flow chart of the control method of the battery system provided by the embodiment of the present application.
  • FIG. 5 is another schematic flowchart of the control method of the battery system provided by the embodiment of the present application.
  • FIG. 6 is a schematic block diagram of a control device of a battery system provided by an embodiment of the present application.
  • FIG. 7 is another schematic block diagram of a battery system control method provided by an embodiment of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • batteries in energy storage systems and electric vehicles mostly use multiple batteries connected in parallel to meet the capacity and performance requirements of energy storage systems and electric vehicles.
  • the battery is provided with a master battery management unit and multiple slave battery management units.
  • MBMU and SBMU communicate with each other.
  • MBMU can obtain battery current, cell voltage, relay status, power, SOC and other information from SBMU, so that it can perform energy management and maintenance of the battery system based on this information.
  • the MBMU cannot accurately obtain or even obtain the current, cell voltage, relay status, SOC and other information of the battery in the battery branch where the SBMU is located. , the SOC of the entire battery system cannot be determined, and thus information such as the cruising range or battery life of the electrical device cannot be accurately calculated, resulting in the battery system being deactivated, which cannot guarantee the safety of the user and degrades the user experience.
  • embodiments of the present application provide a method for controlling a battery system.
  • the method can be based on the obtained current information of the main circuit of the battery system and the battery system.
  • the current information of the battery branch with normal communication is determined in the first battery branch with abnormal communication, and the SOC of the battery system is determined based on the status of the first battery branch.
  • the battery system control scheme provided by the embodiments of the present application can accurately determine the SOC of the battery system when there is a battery branch with abnormal communication in the battery system, so that the battery life information of the battery system can be more accurately determined based on the SOC. etc. to ensure user safety and improve user experience.
  • Figure 1 shows a high-voltage architecture topology diagram of a battery system applicable to embodiments of the present application.
  • the battery system 100 may include: multiple parallel battery branches 110, for example, battery branches 1101,..., battery branches 110N.
  • a negative relay 111 may be provided in each battery branch 110, for example, negative relays 1111,..., negative relays 1111N.
  • the negative electrode relay 111 is connected in series with the negative electrode of the battery in the battery 110 .
  • the negative relay 111 is used to control the high-voltage connection and disconnection between the battery 110 and the vehicle system.
  • the battery branch 110 may also be provided with a direct current/direct current (DC/DC) converter 112, for example, DC/DC converter 1121,..., DC/DC converter 112N.
  • DC/DC direct current/direct current
  • the DC/DC converter 112 is used to convert the high voltage in the battery branch 110 into a low voltage to provide low voltage for power supply devices and hardware.
  • the battery branch 110 is also provided with a cell supervisory control (CSC) unit 113, which is used to collect the cell voltage and cell temperature of the battery branch 110.
  • CSC cell supervisory control
  • current sampling elements can also be provided inside the battery branch 110, such as current sampling elements 1151,..., current sampling elements 115N, for collecting the current from the battery branch 1101 to the battery branch 110N.
  • the battery system 100 may also include: a main positive relay 120 , which is disposed on the trunk road after multiple battery branches 110 are connected in parallel, and is used to control the high voltage of the battery system 100 and the entire vehicle system.
  • the battery system 100 further includes a current sampling element 160 for collecting the main circuit current of the battery system 100 .
  • the battery system 100 also includes a precharge relay 130 and a precharge resistor 140 for performing high-voltage precharge.
  • the battery system 100 is also provided with a main battery management unit 150 .
  • the battery branch 110 is provided with a slave battery management unit 114, for example, SBMU 1141,..., SBMU 114N.
  • MBMU and SBMU communicate with each other.
  • MBMU 150 can obtain the current value, cell voltage, relay status, power, SOC and other status of battery branch 110 from SBMU 114.
  • the communication between MBMU 150 and SBMU 114 includes wireless Bluetooth, CAN bus, Ethernet, 5G network communication, etc.
  • the embodiment of this application does not specify the type of wired communication or wireless communication between MBMU 150 and SBMU 114. limited.
  • the MBMU 150 and the SBMU 114 can be integrated with the battery and set up in the same device/device, or the MBMU 150 and the SBMU 114 can also be set up outside the battery as independent equipment/device, which is not limited in this application.
  • the SBMU 114 can be implemented using the battery management system (BMS) corresponding to the battery branch 110; the MBMU 150 can be implemented through the control module of the battery disconnect unit (battery disconnect unit, BDU), or through One of the battery branches 110 is implemented by the BMS.
  • BMS battery management system
  • BDU battery disconnect unit
  • the battery in the battery system 100 can be any type of battery, including but not limited to: lithium-ion battery, lithium metal battery, lithium-sulfur battery, lead-acid battery, nickel separator battery, lithium iron phosphate battery, Nickel metal hydride batteries, or lithium air batteries, etc.
  • the specific type of battery is not specifically limited.
  • FIG. 2 shows a schematic flow chart of the control method of the battery system provided by the embodiment of the present application. The control method of the battery system shown in FIG. 2 can be applied to the battery system of FIG. 1 .
  • the current information of the battery system includes the current information of the main circuit of the battery system and the current information of the battery branches with normal communication in the battery system.
  • the SBMU and MBMU corresponding to the first battery branch cannot communicate or communicate abnormally, and the MBMU cannot obtain or cannot accurately obtain information such as current, voltage, relay status, and SOC of the first battery branch. If the data sent by the SBMU corresponding to the first battery branch received by the MBMU is abnormal, the MBMU can determine that the communication of the first battery branch is abnormal.
  • the MBMU can obtain the current information of the battery branch with normal communication in the battery system.
  • the SBMU corresponding to the battery branch in the battery system can obtain the current of the battery branch.
  • the current information of these battery branches with normal communication can be sent to MBMU.
  • the MBMU can also obtain current information of the main circuit of the battery system.
  • the current of the main circuit can be collected through a current sampling element provided on the main circuit, and then the current information is sent to the MBMU.
  • the state of the first battery branch includes a closed state or an open state.
  • the MBU Due to abnormal communication in the first battery branch, the MBU is unable to obtain or cannot accurately obtain information such as the status of the first battery branch. Furthermore, the MBMU cannot accurately determine the SOC of the battery system. In other words, when the communication of the first battery branch is abnormal, the MBMU cannot obtain the status of the first battery branch, and cannot determine whether to include the SOC of the first battery branch into the calculation when determining the SOC of the battery system.
  • the first battery branch when the communication of the first battery branch is abnormal, the first battery branch can be determined based on the current information of the main circuit of the battery system and the current information of the battery branch with normal communication in the battery system. status.
  • the battery system control scheme provided by the embodiment of the present application can be used based on the obtained current information of the main circuit of the battery system and the battery branch with normal communication in the battery system when there is a first battery branch with abnormal communication.
  • the current information is used to determine the status of the first battery branch, thereby determining the SOC of the battery system based on the status of the first battery branch.
  • the SOC of the battery system can be accurately determined, so that the battery life information of the battery system can be more accurately determined based on the SOC, ensuring user safety and improving user experience. At the same time, it can avoid excessive discharge of the battery system and improve the performance and service life of the battery system.
  • the state of the first battery branch determined based on the current information may be different, and the method of determining the SOC of the battery system may also be different.
  • the following describes the control methods of the battery system under different situations based on the current information obtained according to the embodiments of the present application with reference to FIG. 3 and FIG. 4 .
  • FIG. 3 is another schematic flow chart of the control method of the battery system provided by the embodiment of the present application.
  • step 310 For relevant content of step 310, please refer to step 210, which will not be described in detail here.
  • the current difference between the main circuit of the battery system and the battery branch with normal communication can be the main circuit current of the battery system minus the current of the battery branch with normal communication, or it can also be the main circuit current of the battery system minus the current of the battery branch with normal communication.
  • the current of the battery branch minus the main circuit current of the battery system is I
  • the currents of K (N is a positive integer) battery branches with normal communication are I 1 , I 2 ,...I K respectively.
  • the main circuits of the current system and the battery branches with abnormal communication are The current difference between the paths is: or
  • the current difference between the main circuit of the battery system and the battery branch with normal communication may be the absolute current of the main circuit of the battery system minus the current of the battery branch with normal communication. value, or the absolute value of the normal battery branch current minus the main circuit current of the battery system can be communicated.
  • the main circuit current of the battery system is I
  • the currents of K (N is a positive integer) battery branches with normal communication are I 1 , I 2 ,...I K respectively.
  • the main circuits of the current system and the battery branches with abnormal communication are The current difference between the paths is: or
  • the difference between the current of the main circuit of the battery system minus the current of the battery branch with normal communication should be equal to the current of the first battery branch.
  • the state of the first battery branch is a disconnected state.
  • the current of the first battery branch obtained by the difference between the current of the battery branch with normal communication is not zero, but a certain value I ⁇ greater than zero.
  • the preset range can be [-I ⁇ , I ⁇ ]. That is to say, when the calculated current difference is within the range of [-I ⁇ , I ⁇ ], the state of the first battery branch is the disconnected state.
  • the preset range can be set to 0. That is, when the calculated current difference is 0, the state of the first battery branch is the disconnected state.
  • the influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy and the influence of factors such as zero drift can be considered to set the preset range.
  • the current between the main circuit of the battery system and the battery branch with normal communication When the difference is within the preset range, it can be determined that the state of the first battery branch is a disconnected state.
  • the battery system control scheme provided by the embodiment of the present application can determine the status of the first battery branch based on the current difference between the main circuit of the battery system and the battery branch with normal communication, and can prevent the first battery branch from causing abnormal communication before
  • the problem of excessive discharge of other closed battery branches in the battery system caused by being in a closed state and being in a disconnected state after a communication abnormality improves the performance and service life of the battery system.
  • it can also be compared based on the status of the first battery branch. Accurately determine the SOC of the battery system, thereby more accurately calculating the battery system's endurance information.
  • the SBMU of the battery branch with normal communication in the battery system can obtain the SOC and status of the battery branch where the SBMU is located, and then the SBMU of the battery branch with normal communication can obtain the obtained battery branch.
  • the SOC of the road and the status of the battery branch are sent to the MBMU.
  • the MBMU can determine the SOC of the battery system based on the SOC of the battery branch with normal communication and the status of the battery branch with normal communication.
  • the SOC of the first battery branch is not included in the calculation when determining the SOC of the battery system. Instead, the calculation is based on the SOC of the closed battery branch among the battery branches with normal communication. In this way, when the first battery branch communication is abnormal, the SOC of the battery system can be determined more accurately, thereby more accurately calculating the battery life information of the battery system, improving user experience and ensuring user safety.
  • FIG. 4 is another schematic flow chart of the control method of the battery system provided by the embodiment of the present application.
  • step 410 please refer to step 210, which will not be described in detail here.
  • the current difference between the main circuit of the battery system and the battery branch with normal communication can be the main circuit current of the battery system minus the current of the battery branch with normal communication, or it can also be the main circuit current of the battery system minus the current of the battery branch with normal communication.
  • the current of the battery branch minus the main circuit current of the battery system is I
  • the currents of K (N is a positive integer) battery branches with normal communication are I 1 , I 2 ,...I K respectively.
  • the main circuits of the current system and the battery branches with abnormal communication are The current difference between the paths is: or
  • the current difference between the main circuit of the battery system and the battery branch with normal communication may be the absolute value of the main circuit current of the battery system minus the current of the battery branch with normal communication. , it can also communicate the absolute value of the normal battery branch current minus the main circuit current of the battery system.
  • the main circuit current of the battery system is I
  • the currents of K (N is a positive integer) battery branches with normal communication are I 1 , I 2 ,...I K respectively.
  • the main circuits of the current system and the battery branches with abnormal communication are The current difference between the paths is: or
  • the difference between the main circuit current of the battery system minus the current between the battery branches with normal communication should be equal to the current of the first battery branch.
  • the state of the first battery branch is a disconnected state.
  • the current of the first battery branch is greater than zero, the state of the first battery branch is a closed state. Because in actual application, when the state of the first battery branch is disconnected, due to the influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy and the influence of factors such as zero drift, the battery system dryness is calculated.
  • the current of the first battery branch obtained by the difference between the current of the battery branch and the current of the battery branch with normal communication is not zero, but the current of the first battery branch obtained by the current difference of a certain value greater than zero. It is not zero, but a certain value I ⁇ greater than zero.
  • the preset range can be [-I ⁇ , I ⁇ ]. That is to say, when the calculated current difference is within the range of [-I ⁇ , I ⁇ ], the state of the first battery branch is the disconnected state; when the calculated current difference is within the range of [-I ⁇ , I ⁇ ] When outside, the state of the first battery branch is closed.
  • the preset range can be set to zero. That is, when the calculated current difference is zero, the state of the first battery branch is the disconnected state. When the calculated current difference is greater than zero, the state of the first battery branch is a closed state.
  • the influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy and the influence of factors such as zero drift can be considered to set the preset range.
  • the current difference between the main circuit of the battery system and the battery branch with normal communication is within If it is outside the preset range, it can be determined that the first battery branch is in a closed state.
  • the battery system control scheme provided by the embodiment of the present application can determine the status of the first battery branch based on the current difference between the main circuit of the battery system and the battery branch with normal communication, and can prevent the first battery branch from causing abnormal communication before
  • the problem of excessive discharge of other closed battery branches in the battery system caused by being in a closed state and being in a disconnected state after a communication abnormality improves the performance and service life of the battery system.
  • it can also be compared based on the status of the first battery branch. Accurately determine the SOC of the battery system, thereby more accurately calculating the battery system's endurance information.
  • the SOC of the first battery branch when the state of the first battery branch is a closed state, when calculating the SOC of the battery system, the SOC of the first battery branch is included in the calculation. Therefore, in this case, the SOC of the first battery branch also needs to be determined.
  • the SOC of the first battery branch may be determined based on the SOC of the battery branch with normal communication.
  • the relevant content of determining the SOC of the first battery branch based on the SOC of the battery branch with normal communication will be described below, and will not be described in detail here in this application.
  • the SBMU of the battery branch with normal communication in the battery system can obtain the SOC and status of the battery branch where the SBMU is located, and then the SBMU of the battery branch with normal communication can obtain the SOC and status of the battery branch.
  • the status of the battery branch is sent to the MBMU.
  • the MBMU may determine the SOC of the battery system based on the SOC of the closed battery branch among the battery branches with normal communication and the SOC of the first battery branch.
  • the battery system control scheme provided by the embodiment of the present application can determine the SOC of the first battery branch when the state of the first battery branch is closed, and then incorporate the SOC of the first battery branch into the battery system. SOC calculation. In this way, when the first battery branch communication is abnormal, the SOC of the battery system can be more accurately determined, thereby more accurately calculating the battery life information of the battery system, improving user experience and ensuring user safety.
  • the SOC of the first battery branch can be determined based on the SOC of the battery branch with normal communication.
  • the SOC of the first battery branch can be determined based on the SOC of any battery branch with normal communication.
  • the SOC of the first battery branch can also be determined based on the SOC average of all battery branches with normal communication.
  • the SOC of the first battery branch may be determined based on the SOC of the battery branch with the smallest SOC among the battery branches with normal communication.
  • the SOC of the first battery branch can be determined according to the following formula.
  • SOC j is the SOC of the first battery branch
  • SOC i is the SOC of the battery branch with normal communication
  • ⁇ SOC is the SOC difference between the battery branch with normal communication and the first battery branch before communication abnormality
  • ⁇ is Safety factor
  • the setting of the safety factor ⁇ mainly depends on one or more of the battery pack capacity, temperature or internal resistance of the battery branch with normal communication and the first battery branch.
  • SOC i may be the SOC of the second battery branch with the smallest SOC among the battery branches with normal communication.
  • the battery branch with the smallest SOC may be fixed.
  • the battery branch with the smallest SOC among the latest battery branches with normal communication received by the MBMU is battery branch 5.
  • the SOC of the battery branch 5 can be used to dynamically adjust the SOC of the first battery branch.
  • the battery branch with the smallest SOC may be changed.
  • the battery branch with the smallest SOC among the battery branches with normal communication at the first moment is battery branch 2, and the smallest SOC among the battery branches with normal communication at the second moment.
  • the battery branch is battery branch 4.
  • the SOC of the first battery branch can be determined according to the SOC of battery branch 2.
  • the SOC of battery branch 4 can be determined. SOC of the first battery branch.
  • the SBMU of the battery branch with normal communication can send the SOC information of the branch to the MBMU at certain time intervals. Therefore, SOC i can occur based on the receipt of the SOC information in the communication message. dynamically changing.
  • ⁇ SOC is the SOC difference between the battery branch with normal communication and the first battery branch before communication abnormality.
  • the SOC difference here should be the SOC of the battery branch with normal communication minus Go to the SOC of the first battery branch.
  • SOC i1 the SOC of the battery branch with normal communication
  • SOC j1 the SOC of the first battery branch
  • the battery system control scheme provided by the embodiment of the present application can dynamically adjust the SOC of the first battery branch with abnormal communication based on the SOC of the battery branch with the smallest SOC among the battery branches with normal communication, and also considers the safety factor to avoid SOC. Overestimation. In this way, the SOC of the first battery branch can be determined more accurately and conservatively, so that the SOC of the battery system can be determined accurately and conservatively to avoid over-discharging of the battery system due to excessive SOC estimation.
  • FIG. 5 is another schematic flow chart of the control method of the battery system provided by the embodiment of the present application.
  • step 510 please refer to step 210, which will not be described in detail here.
  • step 520a and steps 521a to 522a or steps 521b to 523b may be performed.
  • the collected current information may not be very accurate due to the influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy. Therefore, the current information judged based on the main circuit current may not be very accurate. The status of the first battery branch is inaccurate, resulting in the inability to accurately determine the SOC of the battery system.
  • the determined state of the first battery branch is more accurate.
  • the status of the first battery branch is determined based on the main circuit current of the battery system.
  • the information and the current information of the battery branch with normal communication in the battery system determine the status of the first battery branch with abnormal communication, and then determine the SOC of the battery system based on the status of the first battery branch.
  • the setting of the preset threshold needs to consider the influence of current sampling components such as current sensors and current sampling chips on current sampling accuracy and other factors.
  • the preset threshold generally does not exceed the maximum current allowed by the full temperature and SOC range of the battery system.
  • the battery system control scheme provided by the embodiment of the present application can be more accurate based on the current information of the main circuit of the battery system and the current information of the battery branches with normal communication in the battery system when the main circuit current of the battery system is large.
  • the state of the first battery branch with abnormal communication can be determined accurately, thereby improving the accuracy of the determined SOC of the battery system.
  • steps 521a to 522a and steps 521b to 523b reference may be made to steps 320 to 330 and steps 420 to 440, which will not be described in detail here.
  • the method of 520b may be performed.
  • the target SOC is the SOC of the first battery branch.
  • the collected current information may not be very accurate due to the influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy. Therefore, it may be possible to judge based on the main circuit current. The status of the first battery branch is inaccurate.
  • the SOC of the battery system is directly determined based on the target SOC, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication. That is to say, when the current of the main circuit of the battery system is less than or equal to the preset threshold, the status of the first battery branch may not be determined. Regardless of whether the first battery branch is in a disconnected state or a closed state, the SOC of the first battery branch can be included in the calculation of the SOC of the battery system.
  • the setting of the preset threshold needs to consider the influence of current sampling components such as current sensors and current sampling chips on current sampling accuracy and other factors.
  • the preset threshold generally does not exceed the maximum current allowed by the full temperature and SOC range of the battery system.
  • the battery system control scheme provided by the embodiment of the present application can include the SOC of the first battery branch regardless of whether the first battery branch is in a closed state or a disconnected state when the main circuit current of the battery system is relatively small.
  • the SOC of the battery system is being calculated. In this way, the data overhead when determining the status of the first battery branch can be reduced and energy consumption can be saved.
  • the main circuit current is small, the demand of the electrical device on the battery system is relatively small. Using the target SOC as the SOC of the first battery branch will not easily cause excessive discharge of the battery system, which can ensure the user's usage needs and improve the user experience. .
  • the target SOC can be determined based on the SOC of the first battery branch before the communication abnormality.
  • the SOC in the latest communication data of the first battery branch obtained by the MBMU before the communication abnormality of the first battery branch can be used as the target SOC.
  • the battery system control scheme provided by the embodiment of the present application can determine a relatively accurate and conservative SOC of the first battery branch when the main circuit current of the battery system is relatively small, thereby improving the safety of the determined SOC of the battery system. and accuracy, so that the battery life information of the battery system can be accurately calculated and excessive discharge of the battery system can be avoided.
  • the current information of the main circuit of the battery system is collected by the current sampling element on the main circuit of the battery system.
  • a current sampling element is provided on the main circuit of the battery system. This current sampling element can collect the current of the main circuit and then send the current information to the MBMU.
  • the battery system control scheme provided by the embodiment of the present application can accurately obtain the current information of the main circuit based on the current sampling element provided on the main circuit of the battery system, and can accurately determine the status of the first battery branch, and thus accurately determine the battery status.
  • System SOC System SOC.
  • the current information of the battery branch with normal communication is collected by the current sampling element in the battery branch with normal communication.
  • Current sampling elements are provided on each battery branch of the battery system. These current sampling elements can collect the current of the battery branch where the current sampling element is located, and send the current information to the corresponding SBMU, and then the SBMU sends the current information to the MBMU.
  • the battery system control scheme provided by the embodiment of the present application can accurately obtain the current information of each battery branch with normal communication based on the current sampling elements provided on each battery branch of the battery system, thereby improving the determined first battery
  • the accuracy of the status of the branch circuit is improved, thereby improving the accuracy of the determined SOC of the battery system.
  • the closed or disconnected state of the battery branch in the battery system is controlled by the relay on the battery branch in the battery system.
  • Each branch in the battery system can be provided with a relay, and the opening or closing of the relay controls the opening or closing of the corresponding battery branch.
  • the high-voltage disconnection or connection status of the battery branch and the vehicle system can be controlled by opening or closing the relay on the branch.
  • the relays in the battery branch can also be replaced by components such as contactors that can interrupt and close the circuit.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • control method of the battery system according to the embodiment of the present application has been described in detail above.
  • the control device of the battery system according to the embodiment of the present application will be described in detail below with reference to Figures 6 and 7.
  • the technical features described in the method embodiment are applicable to the implementation of the following devices. example.
  • FIG. 6 shows a schematic block diagram of the control device 600 of the battery system according to the embodiment of the present application.
  • the battery system includes multiple parallel battery branches.
  • the control device includes some or all of the following contents.
  • the acquisition unit 610 is configured to acquire the current information of the battery system when there is a first battery branch with abnormal communication in the battery system.
  • the current information includes the current information of the main circuit of the battery system and Current information of battery branches with normal communication in the battery system;
  • the control unit 620 is configured to determine the state of the first battery branch according to the current information of the battery system, where the state of the first battery branch includes a closed state or an open state;
  • the control unit 620 is also configured to determine the state of charge SOC of the battery system according to the state of the first battery branch.
  • control unit is specifically configured to: when the current difference between the main circuit of the battery system and the battery branch with normal communication is within a preset range , determining that the state of the first battery branch is a disconnected state.
  • control unit is specifically configured to: when the status of the first battery branch is a disconnected state, the SOC of the battery branch with normal communication and the The state of the battery branch with normal communication determines the SOC of the battery system.
  • control unit is specifically configured to: when the current difference between the main circuit of the battery system and the battery branch with normal communication is outside a preset range , determining that the state of the first battery branch is a closed state.
  • control unit is specifically configured to: determine the SOC of the first battery branch when the state of the first battery branch is a closed state; according to the The SOC of the battery system is determined by the SOC of the first battery branch, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication.
  • control unit is specifically configured to determine the SOC of the first battery branch according to the SOC of the battery branch with normal communication.
  • SOC difference before, ⁇ is the safety factor.
  • control unit is further configured to determine that the current of the trunk circuit of the battery system is greater than or equal to a preset threshold.
  • control unit is further configured to: when the current of the main circuit of the battery system is less than or equal to the preset threshold, according to the target SOC, the communication is normal
  • the SOC of the battery branch and the status of the battery branch with normal communication determine the SOC of the battery system, and the target SOC is the SOC of the first battery branch.
  • the target SOC is determined based on the SOC of the first battery branch before the communication abnormality.
  • the current information of the main circuit of the battery system is collected by a current sampling element in the main circuit of the battery system.
  • the current information of the battery branch with normal communication is collected by the current sampling element in the battery branch with normal communication.
  • the closed or disconnected state of the battery branch in the battery system is controlled by a relay on the battery branch in the battery system.
  • each module in the control device 600 of the battery system is in order to implement the corresponding processes in the various methods of FIG. 2 to FIG. 5 , and will not be described again here for the sake of brevity.
  • embodiments of the present application also provide a battery system, which includes multiple parallel battery branches and the control device 600 provided in the above-mentioned various embodiments.
  • FIG. 7 shows a schematic block diagram of the control device 1000 of the battery system according to the embodiment of the present application.
  • the control device 1000 includes a processor 1010 and a memory 1020 , where the memory 1020 is used to store instructions, and the processor 1010 is used to read instructions and execute the methods of various embodiments of the present application based on the instructions.
  • the memory 1020 may be a separate device independent of the processor 1010, or may be integrated into the processor 1010.
  • the battery system control device 1000 may also include a transceiver 1030 , and the processor 1010 may control the transceiver 1030 to communicate with other devices. Specifically, you can send information or data to other devices, or receive information or data sent by other devices.
  • Embodiments of the present application also provide a computer storage medium for storing a computer program, and the computer program is used to execute the foregoing methods of various embodiments of the present application.
  • the processor in the embodiment of the present application may be an integrated circuit chip and has signal processing capabilities.
  • each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other available processors.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory may be Random Access Memory (RAM), which is used as an external cache.
  • RAM Random Access Memory
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • enhanced SDRAM ESDRAM
  • Synchlink DRAM SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium can be applied to the control device of the battery system in the embodiment of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the control device in the various methods of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding processes implemented by the control device in the various methods of the embodiment of the present application.
  • An embodiment of the present application also provides a computer program product, including computer program instructions.
  • the computer program product can be applied to the control device of the battery system in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the control device of the battery system in each method of the embodiment of the present application, For the sake of brevity, no further details will be given here.
  • An embodiment of the present application also provides a computer program.
  • the computer program can be applied to the control device of the battery system in the embodiment of the present application.
  • the computer program When the computer program is run on the computer, it causes the computer to execute the various methods implemented by the control device of the battery system in the embodiment of the present application. The corresponding process, for the sake of brevity, will not be repeated here.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program code.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Les modes de réalisation de la présente demande concernent un procédé de commande de système de batterie et un appareil de commande. Un système de batterie comprend une pluralité de branches de batterie connectées en parallèle. Le procédé de commande comprend les étapes suivantes : lorsqu'une première branche de batterie qui est en communication anormale est présente dans le système de batterie, acquérir des informations de courant du système de batterie, les informations de courant comprenant des informations de courant d'un chemin primaire du système de batterie et des informations de courant de branches de batterie qui sont en communication normale dans le système de batterie ; en fonction des informations de courant du système de batterie, déterminer l'état de la première branche de batterie, l'état de la première branche de batterie comprenant un état connecté ou un état déconnecté ; et en fonction de l'état de la première branche de batterie, déterminer l'état de charge (SOC) du système de batterie. Une solution de commande de système de batterie fournie dans les modes de réalisation de la présente demande peut déterminer avec précision l'état de charge du système de batterie lorsqu'une branche de batterie qui est en communication anormale est présente dans le système de batterie, garantissant ainsi la sécurité des utilisateurs, et améliorant l'expérience de l'utilisateur.
PCT/CN2022/117884 2022-09-08 2022-09-08 Procédé de commande de système de batterie et appareil de commande WO2024050773A1 (fr)

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JP2014236625A (ja) * 2013-06-04 2014-12-15 株式会社豊田自動織機 車両制御装置および車両制御方法
CN104600784A (zh) * 2014-12-25 2015-05-06 北京新能源汽车股份有限公司 多支路电池储能系统的上电流程控制方法和装置
CN111555386A (zh) * 2020-04-30 2020-08-18 科华恒盛股份有限公司 一种供电电源产品以及供电电源的电池充电保护电路
CN114256915A (zh) * 2021-11-29 2022-03-29 三一汽车制造有限公司 一种电池充电方法、装置及作业机械

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CN101777784A (zh) * 2010-03-17 2010-07-14 北汽福田汽车股份有限公司 均衡充电装置及均衡充电方法
JP2014236625A (ja) * 2013-06-04 2014-12-15 株式会社豊田自動織機 車両制御装置および車両制御方法
CN104009526A (zh) * 2014-06-16 2014-08-27 安徽安凯汽车股份有限公司 一种电动客车动力电池组主动均衡系统及方法
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