WO2024050773A1

WO2024050773A1 - Battery system control method and control apparatus

Info

Publication number: WO2024050773A1
Application number: PCT/CN2022/117884
Authority: WO
Inventors: 叶炜; 李永超; 谢吉海; 曾波; 周康
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2024-03-14

Abstract

Provided in the embodiments of the present application are a battery system control method and a control apparatus. A battery system comprises a plurality of battery branches connected in parallel. The control method comprises: when a first battery branch which is in abnormal communication is present in the battery system, acquiring current information of the battery system, the current information comprising current information of a primary path of the battery system and current information of battery branches which are in normal communication in the battery system; according to the current information of the battery system, determining the state of the first battery branch, the state of the first battery branch comprising a connected state or a disconnected state; and according to the state of the first battery branch, determining the state of charge (SOC) of the battery system. A battery system control solution provided in the embodiments of the present application can accurately determine the SOC of the battery system when a battery branch which is in abnormal communication is present in the battery system, thus ensuring safety of users, and improving the user experience.

Description

Control method and control device of battery system

Technical field

The present application relates to the field of battery technology, and in particular to a control method and control device for a battery system.

Background technique

Energy storage systems and battery systems in electric vehicles mostly adopt the form of multiple battery packs connected in parallel to meet the capacity and performance requirements of the energy storage system and electric vehicles. The battery system is equipped with a master battery management unit (MBMU) and multiple slave battery management units (SBMU). 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.

Currently, if a communication abnormality occurs between the MBMU and the SBMU, 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.

Contents of the invention

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.

In a first aspect, a method of controlling a battery system is provided. The battery system includes a plurality of parallel battery branches. The control method 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. In this way, when there is a battery branch with abnormal communication in the battery system, 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.

In a possible implementation, 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 To accurately determine the SOC of the battery system, the battery life information of the battery system can be calculated more accurately.

In a possible implementation, 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.

In the battery system control scheme provided by the embodiment of the present application, when the status of the battery branch with abnormal communication is disconnected, 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. .

In a possible implementation, 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. At the same time, 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.

In a possible implementation, 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.

In a possible implementation, 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.

In a possible implementation, determining the SOC of the first battery branch based on the SOC of the battery branch with normal communication includes: SOC _j =SOC _i -ΔSOC-μ, where SOC _j is the SOC of the first battery branch, SOC _i is the second battery branch with the smallest SOC among the battery branches with normal communication, ΔSOC is the distance between the second battery branch and the first battery branch. The SOC difference before communication abnormality, μ 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.

In a possible implementation, before determining the status of the first battery branch according to the current information of the battery system, the control method 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.

In a possible implementation, the 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.

In a possible implementation, 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.

In a possible implementation, 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.

In a possible implementation, 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.

In a possible implementation, 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.

In a second aspect, a control device for a battery system is provided. The 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. In the case of a battery branch, 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.

In a possible implementation, the 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.

In a possible implementation, the 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.

In a possible implementation, the 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.

In a possible implementation, the 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.

In a possible implementation, the 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.

In a possible implementation, the control unit is specifically configured to determine the SOC of the first battery branch according to the following formula: SOC _j =SOC _i -ΔSOC-μ, where SOC _j is the The SOC of a battery branch, SOC _i is the second battery branch with the smallest SOC among the battery branches with normal communication, ΔSOC is the difference between the second battery branch and the first battery branch before communication abnormality. SOC difference, μ is the safety factor.

In a possible implementation, the 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.

In a possible implementation, the 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.

In a third aspect, a battery system is provided. The battery system 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.

In a fourth aspect, a control device for a battery system is provided. The control device 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.

In a fifth 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 .

In a sixth aspect, a computer program product is provided. The 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. .

In a seventh aspect, a chip is provided. The chip 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.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings without exerting creative efforts.

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.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "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.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

Currently, 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.

If the communication between MBMU and SBMU is abnormal, for example, if the MBMU receives abnormal data from the SBMU for a sustained period of time, 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.

In view of this, embodiments of the present application provide a method for controlling a battery system. When there is a first battery branch with abnormal communication in the 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. Optionally, a negative relay 111 may be provided in each battery branch 110, for example, negative relays 1111,..., negative relays 1111N. Optionally, 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. Optionally, 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. 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. Optionally, 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. For example, CSC 1131,…,CSC 113N. Optionally, 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.

Optionally, 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. Optionally, the battery system 100 further includes a current sampling element 160 for collecting the main circuit current of the battery system 100 .

Optionally, the battery system 100 also includes a precharge relay 130 and a precharge resistor 140 for performing high-voltage precharge.

Optionally, 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. Among them, 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.

Alternatively, 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.

Optionally, 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.

In the embodiment of the present application, 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. In the embodiments of this application, 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 .

210. If there is a first battery branch with abnormal communication in the battery system, obtain the current information of the battery system.

In the embodiment of the present application, 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.

In this embodiment, 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.

In this embodiment, 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. Through the communication between the SBMU and MBMU corresponding to the battery branch with normal communication, the current information of these battery branches with normal communication can be sent to MBMU.

In this embodiment, the MBMU can also obtain current information of the main circuit of the battery system. Optionally, 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.

220. Determine the status of the first battery branch according to the current information of the battery system.

The state of the first battery branch includes a closed state or an open state.

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.

Therefore, in this embodiment, 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.

230. 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. In this way, when there is a battery branch with abnormal communication in the battery system, 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.

In the embodiment of the present application, there are differences in the obtained current information, 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 .

310. If there is a first battery branch with abnormal communication in the battery system, obtain the current information of the battery system.

For relevant content of step 310, please refer to step 210, which will not be described in detail here.

320. 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 that the state of the first battery branch is the disconnected state.

In the embodiment of the present application, 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. For example, the main circuit current of the battery system is I, and 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

Optionally, in this embodiment, 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. For example, the main circuit current of the battery system is I, and 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

In this embodiment, theoretically, 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. When the current of the first battery branch is equal to zero, the state of the first battery branch is a disconnected state. 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 main circuit of the battery system is calculated. 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 _δ greater than zero. At this time, the preset range can be [-I _δ , I _δ ]. That is to say, when the calculated current difference is within the range of [-I _δ , I _δ ], the state of the first battery branch is the disconnected state.

Optionally, in this embodiment, in actual application, if there is no influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy and the influence of zero drift and other factors, when the state of the first battery branch When in the disconnected state, the current of the first battery branch obtained by calculating the difference between the current of the main circuit of the battery system and the current of the battery branch with normal communication is zero, then 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.

Therefore, 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. At the same time, 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.

330. 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.

In the embodiment of the present application, when the state of the first battery branch with abnormal communication is the disconnected state, when determining the SOC of the battery system, according to the battery branch in the closed state among the battery branches with normal communication, SOC Calculates the SOC of the battery system. In other words, when determining the SOC of the battery system, the SOC of the first battery branch is not included in the calculation.

In this embodiment, 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. Further, 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.

In the battery system control scheme provided by the embodiment of the present application, when the status of the battery branch with abnormal communication is disconnected, 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.

410. If there is a first battery branch with abnormal communication in the battery system, obtain the current information of the battery system.

For relevant description of step 410, please refer to step 210, which will not be described in detail here.

420. When the current difference between the main circuit of the battery system and the battery branch with normal communication is outside the preset range, determine that the state of the first battery branch is a closed state.

or

Optionally, in this embodiment, 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. For example, the main circuit current of the battery system is I, and 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

In this embodiment, theoretically, 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. When the current of the first battery branch is equal to zero, the state of the first battery branch is a disconnected state. When 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 _δ greater than zero. At this time, the preset range can be [-I _δ , I _δ ]. That is to say, when the calculated current difference is within the range of [-I _δ , I _δ ], the state of the first battery branch is the disconnected state; when the calculated current difference is within the range of [-I _δ , I _δ ] When outside, the state of the first battery branch is closed.

Optionally, in this embodiment, in actual application, if there is no influence of current sampling components such as current sensors and current sampling chips on the current sampling accuracy and the influence of zero drift and other factors, when the state of the first battery branch When in the disconnected state, the current of the first battery branch obtained by calculating the difference between the current of the main circuit of the battery system and the current of the battery branch with normal communication is zero, then 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.

Therefore, 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.

430. Determine the SOC of the first battery branch.

In this embodiment, 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.

Optionally, in this embodiment, 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.

440. 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.

In this embodiment, 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. Further, 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.

In this embodiment of the present application, the SOC of the first battery branch can be determined based on the SOC of the battery branch with normal communication.

Optionally, in this embodiment, the SOC of the first battery branch can be determined based on the SOC of any battery branch with normal communication.

Optionally, in this embodiment, the SOC of the first battery branch can also be determined based on the SOC average of all battery branches with normal communication.

Optionally, in this embodiment, 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.

Optionally, in this embodiment of the present application, the SOC of the first battery branch can be determined according to the following formula.

SOC _j =SOC _i -ΔSOC-μ

Among them, SOC _j is the SOC of the first battery branch, SOC _i is the SOC of the battery branch with normal communication, ΔSOC is the SOC difference between the battery branch with normal communication and the first battery branch before communication abnormality, μ is Safety factor, the setting of the safety factor μ 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.

Optionally, in this embodiment, SOC _i may be the SOC of the second battery branch with the smallest SOC among the battery branches with normal communication.

Optionally, in this embodiment, the battery branch with the smallest SOC may be fixed. For example, before a communication abnormality occurs in the first battery branch, the battery branch with the smallest SOC among the latest battery branches with normal communication received by the MBMU is battery branch 5. When a communication abnormality occurs in the first battery branch, The SOC of the battery branch 5 can be used to dynamically adjust the SOC of the first battery branch.

Optionally, in this embodiment, the battery branch with the smallest SOC may be changed. For example, when an abnormality occurs in the first battery branch, 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. Then at the first moment, the SOC of the first battery branch can be determined according to the SOC of battery branch 2. At the second moment, the SOC of battery branch 4 can be determined. SOC of the first battery branch.

Optionally, in this embodiment, 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.

Optionally, in this embodiment, ΔSOC 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. For example, before a communication abnormality occurs in the first battery branch, the SOC of the battery branch with normal communication is SOC _i1 , and the SOC of the first battery branch is SOC _j1 . Then, ΔSOC = SOC _i1 - SOC _j1 .

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.

510. If there is a first battery branch with abnormal communication in the battery system, obtain the current information of the battery system.

For relevant description of step 510, please refer to step 210, which will not be described in detail here.

When the main circuit current of the battery system is greater than or equal to the preset threshold, step 520a and steps 521a to 522a or steps 521b to 523b may be performed.

520a. Determine that the main circuit current of the battery system is greater than or equal to the preset threshold.

In the embodiment of the present application, when the currents in several channels are small, 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.

Therefore, in this embodiment, when it is determined that the main circuit current of the battery system is greater than or equal to the preset threshold, the determined state of the first battery branch is more accurate. At this time, 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.

Among them, 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. In addition, 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.

When the currents of the main circuit of the battery system and the battery branches with normal communication are within a preset range, the method of steps 521a to 522a can be performed.

521a. 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 that the state of the first battery branch is the disconnected state.

522a. When the state of the first battery branch is the disconnected state, determine the SOC of the battery system based on the SOC of the battery branch with normal communication and the state of the battery branch with normal communication.

When the current of the main circuit of the battery system and the battery branch with normal communication is outside the preset range, the method of steps 521b to 523b can be performed.

521b. When the current difference between the main circuit of the battery system and the battery branch with normal communication is outside the preset range, determine that the state of the first battery branch is a closed state.

522b. Determine the SOC of the first battery branch.

523b. 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.

For detailed descriptions of the above 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.

When the current of the main circuit of the battery system is less than or equal to the preset threshold, the method of 520b may be performed.

520b. When the current of the main circuit of the battery system is less than or equal to the preset threshold, determine the SOC of the battery system based on the target SOC, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication.

In this embodiment, the target SOC is the SOC of the first battery branch.

In this embodiment, when several circuit currents are small, 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.

Therefore, when the current of the main circuit of the battery system is less than or equal to the preset threshold, it is not necessary to determine the third cause of abnormal communication based on the current difference between the main circuit of the battery system and the battery branch with normal communication in the battery system. 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.

In this embodiment, 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. In addition, 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. At the same time, when 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. .

In this embodiment of the present application, the target SOC can be determined based on the SOC of the first battery branch before the communication abnormality.

Optionally, in this embodiment, 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.

In the embodiment of the present application, 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.

In the embodiment of the present application, 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.

In the embodiment of the present application, 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. For example, 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.

Optionally, in this embodiment, the relays in the battery branch can also be replaced by components such as contactors that can interrupt and close the circuit.

It should be understood that in the various embodiments of the present application, 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.

The 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. Among them, the battery system includes multiple parallel battery branches. As shown in Figure 6, 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.

Optionally, in this embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the control unit is specifically configured to determine the SOC of the first battery branch according to the following formula: SOC _j =SOC _i -ΔSOC-μ, where SOC _j is the The SOC of the first battery branch, SOC _i is the second battery branch with the smallest SOC among the battery branches with normal communication, ΔSOC is the communication abnormality between the second battery branch and the first battery branch. The SOC difference before, μ is the safety factor.

Optionally, in this embodiment of the present application, the 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.

Optionally, in the embodiment of the present application, the 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.

Optionally, in this embodiment of the present application, the target SOC is determined based on the SOC of the first battery branch before the communication abnormality.

Optionally, in this embodiment of the present application, 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.

Optionally, in this embodiment of the present application, the current information of the battery branch with normal communication is collected by the current sampling element in the battery branch with normal communication.

Optionally, in this embodiment of the present application, 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.

It should be understood that the above and other operations and/or functions of each module in the control device 600 of the battery system are 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.

Optionally, 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. As shown in FIG. 7 , 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.

Optionally, as shown in FIG. 7 , 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.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip and has signal processing capabilities. During the implementation process, 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. Programmed logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed. 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.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, 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. By way of illustration, but not limitation, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.

Optionally, 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. For the sake of simplicity , which will not be described in detail here.

An embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, 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.

Optionally, the computer program can be applied to the control device of the battery system in the embodiment of the present application. 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.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, 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.

In addition, 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.

If 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. Based on this understanding, 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.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

A control method for a battery system, characterized in that the battery system includes a plurality of parallel battery branches, and the control method includes:

When there is a first battery branch with abnormal communication in the battery system, the current information of the battery system is obtained. The current information includes the current information of the main circuit of the battery system and the communication in the battery system. Normal battery branch current information;

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;

According to the state of the first battery branch, the state of charge SOC of the battery system is determined.
The control method according to claim 1, wherein determining the state of the first battery branch according to the current information of the battery system includes:

When the current difference between the main circuit of the battery system and the battery branch with normal communication is within a preset range, the state of the first battery branch is determined to be a disconnected state.
The control method according to claim 1 or 2, wherein 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 control method according to any one of claims 1 to 3, wherein determining the state of the first battery branch according to the current information of the battery system includes:

When the current difference between the main circuit of the battery system and the battery branch with normal communication is outside the preset range, it is determined that the state of the first battery branch is a closed state.
The control method according to any one of claims 1 to 4, wherein 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, determine the SOC of the first battery branch;

The SOC of the battery system is determined based on the SOC of the first battery branch, the SOC of the battery branch with normal communication, and the state of the battery branch with normal communication.
The control method according to claim 5, wherein determining the SOC of the first battery branch includes:

The SOC of the first battery branch is determined based on the SOC of the battery branch with normal communication.
The control method according to claim 6, wherein determining the SOC of the first battery branch based on the SOC of the battery branch with normal communication includes:

SOC j =SOC i -ΔSOC-μ,

Wherein, SOC j is the SOC of the first battery branch, SOC i is the second battery branch with the smallest SOC among the battery branches with normal communication, ΔSOC is the difference between the second battery branch and the first battery branch. The SOC difference of the battery branch before communication abnormality, μ is the safety factor.
The control method according to any one of claims 1 to 7, characterized in that, before determining the state of the first battery branch according to the current information of the battery system, the control method includes:

It is determined that the current of the main circuit of the battery system is greater than or equal to a preset threshold.
The control method according to claim 8, characterized in that the control method further includes:

When the current of the main circuit of the battery system is less than or equal to the preset threshold, the determination of the battery branch is based on the target SOC, the SOC of the battery branch with normal communication, and the status of the battery branch with normal communication. The SOC of the battery system, the target SOC is the SOC of the first battery branch.
The control method according to claim 9, wherein the target SOC is determined based on the SOC of the first battery branch before communication abnormality.
The control method according to any one of claims 1 to 10, characterized in that 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 control method according to any one of claims 1 to 11, characterized in that 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 control method according to any one of claims 1 to 12, characterized in that the closed or open 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, characterized in that the battery system includes a plurality of parallel battery branches, and the control device includes:

An acquisition unit, configured to acquire current information of the battery system when there is a first battery branch with abnormal communication in the battery system, where the current information includes current information of the main circuit of the battery system and the current information of the battery system. The current information of the battery branch with normal communication in the battery system is described;

A control unit 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 is configured to determine the state of charge SOC of the battery system according to the state of the first battery branch.
The control device according to claim 14, characterized in that the control unit is specifically used for:

When the current difference between the main circuit of the battery system and the battery branch with normal communication is within a preset range, the state of the first battery branch is determined to be a disconnected state.
The control device according to claim 14 or 15, characterized in that the control unit is specifically used for:

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 control device according to any one of claims 14 to 16, characterized in that the control unit is specifically used for:

When the current difference between the main circuit of the battery system and the battery branch with normal communication is outside the preset range, it is determined that the state of the first battery branch is a closed state.
The control device according to any one of claims 14 to 17, characterized in that the control unit is specifically used for:

When the state of the first battery branch is a closed state, determine the SOC of the first battery branch;

The SOC of the battery system is determined based on the SOC of the first battery branch, the SOC of the battery branch with normal communication, and the state of the battery branch with normal communication.
The control device according to claim 18, characterized in that the control unit is specifically used for:

The SOC of the first battery branch is determined based on the SOC of the battery branch with normal communication.
The control device according to claim 19, characterized in that the control unit is specifically used for:

According to the following formula, determine the SOC of the first battery branch:

SOC j =SOC i -ΔSOC-μ,

Wherein, SOC j is the SOC of the first battery branch, SOC i is the second battery branch with the smallest SOC among the battery branches with normal communication, ΔSOC is the difference between the second battery branch and the first battery branch. The SOC difference of the battery branch before communication abnormality, μ is the safety factor.
The control device according to any one of claims 14 to 20, characterized in that the control unit is also used for:

It is determined that the current of the main circuit of the battery system is greater than or equal to a preset threshold.
The control device according to claim 21, characterized in that the control unit is also used for:

When the current of the main circuit of the battery system is less than or equal to the preset threshold,

The SOC of the battery system is determined according to the target SOC, the SOC of the battery branch with normal communication, and the state of the battery branch with normal communication, where the target SOC is the SOC of the first battery branch.
The control device according to claim 22, wherein the target SOC is determined based on the SOC of the first battery branch before communication abnormality.
The control device according to any one of claims 14 to 23, characterized in that 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 control device according to any one of claims 14 to 24, characterized in that 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 control device according to any one of claims 14 to 25, characterized in that the closed or open 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, characterized in that the battery system includes a plurality of parallel battery branches and the control device according to any one of claims 14 to 26.
A control device for a battery system, characterized in that the control device includes a memory and a processor, the memory is used to store instructions, and the processor is used to read the instructions and execute the instructions according to claim 1 to the method described in any one of 13.
A computer-readable storage medium, characterized in that it is used to store a computer program, the computer program causing the computer to execute the method according to any one of claims 1 to 13.
A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 1 to 13.