Wireless battery management system and method of operation based on cell monitoring unit(CMU) with wireless communication master function

Abstract

The present invention relates to a wireless battery management system based on a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function and a method of operation thereof. A wireless battery management system according to one embodiment of the present invention comprises: a plurality of CMUs connected to each battery module constituting a battery system and measuring the state of the battery module; and a Battery Management Unit (BMU) implemented outside the battery system, wherein a specific CMU among the plurality of CMUs receives cell state information measured by the plurality of CMUs via wireless communication and transmits it to the BMU.

Description

Technology Field

[0001] The present invention relates to a battery management system and a method of operating the same. More specifically, it relates to a wireless battery management system and a method of operating the same in which the Battery Management Unit (BMU) of the Battery Management System (BMS) is removed from within the battery system and wireless communication of the BMS is implemented using only the Cell Monitoring Unit (CMU) of the BMS. Background Technology

[0002] The core competitive advantage of eco-friendly electric vehicles, such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), and PHEVs (Plug-in Hybrid Electric Vehicles), is driving range, and to achieve this, absolute space is required within the battery system to accommodate as many batteries as possible.

[0003] A Battery Management System (BMS) is a system that controls and manages the charging and discharging of such a battery system, and consists of one or more Cell Monitoring Units (CMUs) that monitor multiple batteries, and Battery Management Units (BMUs) that manage the CMUs.

[0004] Recently, to secure space for battery installation, there is a trend to implement communication between the BMS's BMU (Master) and CMU (Slave) using wireless communication rather than the traditional wired method, thereby eliminating communication wires and securing absolute space and energy density.

[0005] Meanwhile, in the case of conventional technology, the BMU (Master) in the BMS is installed inside the battery system because it acts as a wireless master that controls wireless communication between all CMUs within the battery system.

[0006] However, according to conventional technology, the BMU is mounted / implemented in an independent space exceeding a certain area within the battery system, considering factors such as ease of maintenance, electromagnetic immunity performance, and insulation separation distance. This presents a problem in that it acts as a limitation in securing space for battery mounting and energy density within the battery system. Prior art literature

[0007] Korean Registered Patent No. 10-2424982 The problem to be solved

[0008] The present invention was devised to solve the problems described above, and the objective of the present invention is to provide a CMU-based wireless battery management system equipped with a wireless communication Master function and a method of operation thereof, which removes the BMU of the BMS within the battery system and implements BMS wireless communication using only the CMU.

[0009] The objectives of the present invention are not limited to the problems mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be understood that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0010] For the above purpose, a wireless battery management system based on a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function according to one embodiment of the present invention comprises: a plurality of CMUs connected to each battery module constituting a battery system to measure the status of the battery module; and a Battery Management Unit (BMU) implemented outside the battery system, wherein a specific CMU among the plurality of CMUs receives cell status information measured by the plurality of CMUs via wireless communication and transmits it to the BMU.

[0011] Preferably, the specific CMU has two or more wireless interface units for wireless communication, diagnoses the wireless communication status of the two or more wireless interface units, and resets them upon error diagnosis.

[0012] Preferably, the BMU checks whether cell status information for the entire battery module within the battery system is normally received from the specific CMU.

[0013] Preferably, the specific CMU performs a diagnosis of the wireless communication status when cell status information for the entire battery module is not normally received by the BMU.

[0014] Preferably, the diagnosis of the wireless communication status is performed by a process of diagnosing the wireless communication status of the first wireless interface unit based on the success rate and number of retransmissions of wireless data packets received from the plurality of CMUs through the first wireless interface unit among the two or more wireless interface units; a process of resetting the first wireless interface unit when a reception error is diagnosed for the first wireless interface unit through the diagnosis process; and a process of resetting another second wireless interface unit among the two or more wireless interface units when a reception error is not diagnosed for the first wireless interface unit through the diagnosis process.

[0015] Preferably, the communication structure between the BMU and the specific CMU is a structure in which wired communication is connected between each wireless interface unit within the BMU and the specific CMU.

[0016] Preferably, the specific CMU has a structure comprising a module measurement function unit that measures the state of a battery module to which the specific CMU is connected, and a wireless communication Master function unit that receives, via wireless communication, each cell state information measured by the module measurement function unit and a CMU other than the specific CMU among the plurality of CMUs, and transmits it to the BMU.

[0017] Meanwhile, a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function according to one embodiment of the present invention comprises: a module measurement function unit that measures the state of a battery module to which the CMU is connected within a battery system; and a wireless communication Master function unit that receives cell state information measured by another CMU connected to another battery module within the battery system and cell state information measured by the module measurement function unit via wireless communication, and transmits it to a BMU implemented outside the battery system.

[0018] Preferably, the wireless communication Master function unit is equipped with two or more wireless interface units for wireless communication, diagnoses the wireless communication status of the two or more wireless interface units, and resets them upon error diagnosis.

[0019] Preferably, the wireless communication Master function unit uses a different power source than the module measurement function unit.

[0020] Preferably, the wireless communication Master function unit receives and uses vehicle power different from the power used by the module measurement function unit.

[0021] Preferably, within the CMU, the module measurement function unit of the high voltage (HV) domain and the wireless communication master function unit of the low voltage (LV) domain are designed to be insulated from each other.

[0022] Meanwhile, a method of operation of a wireless battery management system based on a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function according to one embodiment of the present invention comprises: a step in which a plurality of CMUs connected to each battery module constituting a battery system measure the state of the battery module; a step in which a specific CMU among the plurality of CMUs receives cell state information measured by the plurality of CMUs via wireless communication; and a step in which the specific CMU transmits the cell state information received via wireless communication to a Battery Management Unit (BMU) implemented outside the battery system.

[0023] Preferably, the method further includes the step of the BMU checking whether cell status information for the entire battery module within the battery system is normally received from the specific CMU; and if the cell status information for the entire battery module is not normally received by the BMU, the specific CMU diagnosing the wireless communication status for two or more wireless interface units for wireless communication.

[0024] Preferably, the diagnosis of the wireless communication status is performed by a process of diagnosing the wireless communication status of the first wireless interface unit based on the success rate and number of retransmissions of wireless data packets received from the plurality of CMUs through the first wireless interface unit among the two or more wireless interface units; a process of resetting the first wireless interface unit when a reception error is diagnosed for the first wireless interface unit through the diagnosis process; and a process of resetting another second wireless interface unit among the two or more wireless interface units when a reception error is not diagnosed for the first wireless interface unit through the diagnosis process.

[0025] Preferably, the communication structure between the BMU and the specific CMU is a structure in which wired communication is connected between each wireless interface unit within the BMU and the specific CMU. Effects of the invention

[0026] According to the present invention, by removing the BMU within the battery system and implementing BMS wireless communication using only the CMU, the space for mounting the BMU within the existing battery system can be used as a space for mounting additional batteries, thereby securing energy density, and furthermore, the maintenance bay for BMU A / S at the bottom of the battery system can be removed, thereby securing battery stability.

[0027] Furthermore, according to the present invention, by implementing a Master CMU equipped with a wireless communication Master function in a location advantageous for optimizing the structure and performance of wireless communication within a battery system, the performance of wireless communication is improved and cell monitoring performance is significantly enhanced by securing the degree of freedom in positioning the Master CMU. Brief explanation of the drawing

[0028] Figure 1 is a diagram illustrating a wireless communication structure of a BMS according to the prior art in which the BMU and CMU of the BMS are installed inside the battery system. FIG. 2 is a diagram illustrating a structure in which the BMU within the battery system is removed (externally implemented) and BMS wireless communication is implemented using only the CMU within the battery system in the present invention. FIG. 3 is a configuration diagram illustrating a CMU-based wireless battery management system equipped with a wireless communication Master function according to an embodiment of the present invention. FIG. 4 is a detailed drawing illustrating the configuration of a CMU equipped with a wireless communication Master function according to an embodiment of the present invention. FIGS. 5 and 6 are flowcharts of the operation method of a CMU-based wireless battery management system equipped with a wireless communication Master function according to an embodiment of the present invention. Specific details for implementing the invention

[0029] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are assigned the same reference number, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not inherently possess distinct meanings or roles. Furthermore, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description will be omitted. Additionally, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification; the technical concept disclosed in this specification is not limited by the attached drawings, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the invention.

[0030] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0031] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0033] Hereinafter, with reference to FIGS. 1 to 6, a CMU-based wireless battery management system equipped with a wireless communication Master function according to the present invention and a method of operation thereof will be described in detail.

[0034] Before describing the present invention, the wireless communication structure of a BMS of the prior art will first be explained with reference to FIG. 1.

[0035] Figure 1 is a diagram illustrating a wireless communication structure of a BMS according to the prior art in which the BMU and CMU of the BMS are installed inside the battery system.

[0036] Referring to Fig. 1, in the case of the prior art, the wireless communication BMS (Battery Management System) within the battery system consists of a BMU (Battery Management Unit) acting as a wireless manager that oversees the entire wireless communication, and a CMU (Cell Monitoring Unit) acting as a wireless node that measures the voltage / temperature and cell balancing of the battery cells.

[0037] As can be seen in Fig. 1, according to the prior art, a BMS acting as a wireless manager that controls wireless communication between all CMUs within the battery system is installed inside the battery system.

[0038] The status of battery cells within the battery system, such as voltage, temperature, and cell balancing, is measured by each CMU mounted / connected to each battery module, and the cell status information measured in this way is transmitted from the CMU to the BMU via wireless communication.

[0039] And according to the prior art, the wireless communication status within the battery system (e.g., reception strength, number of wireless communication failures, etc.) is determined by the BMU, all wireless data transmission and reception within the battery system is managed by the BMU, and all wireless nodes (CMUs) transmit and receive wireless data centered around the wireless manager (BMU).

[0040] However, considering factors such as ease of maintenance, electromagnetic immunity performance, and insulation separation distance, BMUs are installed and implemented in an independent space exceeding a certain area within the battery system; this has the problem of acting as a limitation in securing space for battery installation and energy density within the battery system.

[0041] In order to solve the above problems of the prior art, the present invention proposes a new BMS wireless communication structure that removes the BMU of the BMS inside the battery system and implements BMS wireless communication using only the CMU.

[0042] In this invention, a new BMS wireless communication structure is proposed based on a CMU equipped with a wireless communication Master function (also known as a Master CMU) by implementing the circuit and wireless logic of the wireless Manager role of an existing BMU in a specific CMU.

[0044] The wireless communication structure of the BMS of the present invention will be explained below with reference to FIG. 2.

[0045] FIG. 2 is a diagram illustrating a structure in which the BMU within the battery system is removed (externally implemented) and BMS wireless communication is implemented using only the CMU within the battery system in the present invention.

[0046] As illustrated in FIG. 2, according to the present invention, a BMU is implemented outside the battery system, and a circuit and wireless logic acting as the wireless manager of an existing BMU are integrated / implemented in at least one of a plurality of CMUs within the battery system. The CMU in which the circuit and wireless logic acting as the wireless manager of an existing BMU are integrated / implemented, i.e., the CMU equipped with a wireless communication master function, will be referred to as the Master CMU below.

[0047] FIG. 2 shows an example in which one Master CMU is implemented within a battery system. According to the present invention, a Master CMU can be implemented at any location of a plurality of CMUs within a battery system.

[0048] As such, according to the present invention, a Master CMU-based wireless BMS is proposed in which the BMU of the BMS is removed from within the battery system and at least one of the CMSs is implemented as a Master CMU. By removing the BMU from within the battery system, it is possible to remove the maintenance depot within the battery system and secure battery stability and energy density by installing additional battery cells.

[0049] However, as the wireless manager role of the existing BMU is integrated / implemented within a specific CMU (Master CMU), the current consumption of the specific CMU (Master CMU) may increase compared to the remaining CMUs (hereinafter, Slave CMUs), which may lead to a reduction in driving range due to capacity variations between battery modules.

[0050] Based on this, more specifically, the present invention proposes a Master CMU-based wireless BMS as described above, and specifically proposes a communication circuit and logic within the Master CMU to prevent current consumption deviation between the Master CMU and the Slave CMU and to stably transmit cell status information within the battery system to an external BMU.

[0052] Hereinafter, a Master CMU-based wireless BMS and a method of operation thereof according to an embodiment of the present invention will be described for implementing the new BMS wireless communication structure proposed in the present invention as described above.

[0053] FIG. 3 is a configuration diagram illustrating a wireless BMS based on a CMU (hereinafter referred to as Master CMU) equipped with a wireless communication Master function according to an embodiment of the present invention. FIG. 4 is a detailed drawing illustrating the configuration of a Master CMU according to an embodiment of the present invention.

[0054] Referring to FIG. 3, a wireless BMS (300) based on a Master CMU according to one embodiment of the present invention includes a plurality of CMUs (Cell Monitoring Units; 100A, B) connected to each battery module constituting the battery system (200) to measure the state of the battery module, and a BMU (Battery Management Unit; 10) implemented outside the battery system (200).

[0055] A specific CMU (100A) among a plurality of CMUs (100A, B) receives cell status information measured by the plurality of CMUs (100A, B) via wireless communication and transmits it to the BMU (10).

[0056] In the present invention, a specific CMU (100A) is a CMU equipped with a wireless communication Master function, i.e., a Master CMU, and will be referred to as Master CMU (100A) in the following description. Also, for convenience of explanation, among the plurality of CMUs (100A, B), the CMUs (100B) other than Master CMU (100A) will be referred to as Slave CMUs (100B).

[0057] Each Slave CMU (100B) measures the state of the battery cells included in the battery module to which it is connected / directly connected (e.g., voltage / temperature, cell balancing, etc.) to generate cell state information and transmits it to the Master CMU (100A) which acts as the wireless manager of the existing BMU in the battery system (200).

[0058] In the present invention, the BMU (10) is implemented outside the battery system (200), and, for example, can be implemented within an in-vehicle electrical component integration function module (IPEM) outside the battery system (200).

[0059] The BMU (10) may be configured with a judgment logic (e.g., MCU (15)) that determines whether there is an abnormal state of a battery module within the battery system (200) based on cell state information, without having the circuit and wireless logic of the wireless manager role of the existing BMU.

[0060] Accordingly, the BMU (10) can receive cell status information for the battery system (200) from the Master CMU (100A), and based on this, determine whether there is an abnormal state of the battery module within the battery system (200) and perform subsequent actions based on the determination, thereby performing cell monitoring operations within the battery system.

[0061] The Master CMU (100A) performs the inherent function of a CMU (e.g., measuring the voltage / temperature of the battery cell, cell balancing, etc.) of the battery cell included in the battery module to which it is connected / directly connected, while simultaneously performing the role of a wireless manager that was previously performed by the existing BMU.

[0062] To this end, the Master CMU (100A) has a structure that includes a module measurement function unit (110, the inherent function of the CMU) that measures the state of the battery module to which the Master CMU (100A) itself is connected / directly connected, and a wireless communication Master function unit (120, the role of the wireless manager that the existing BMU performed) that receives cell state information measured by each Slave CMU (100B) and the module measurement function unit (110) via wireless communication and transmits it to the BMU (10).

[0063] That is, the Master CMU (100A) is characterized by including a wireless communication Master function unit (120) to perform the wireless Manager role that the existing BMU used to perform.

[0064] According to the present invention, the wireless communication status (e.g., reception strength / number of wireless communication failures, etc.) within the battery system (200) can be determined by the Master CMU (100A).

[0065] According to the present invention, all wireless data transmission and reception within the battery system (200) is managed by a wireless IC Manager (see FIG. 4) within the Master CMU (100A), and the wireless IC Manager is designed with a redundant structure to prevent the inability to monitor cells within the battery system due to a single wireless IC failure (see FIG. 4).

[0066] According to the present invention, the Master CMU (100A) is configured with a power supply based on a module-based high voltage (HV) domain for measuring the voltage / temperature and cell balancing of the battery cell, as well as a low voltage (LV) domain for preventing current consumption deviation with the Slave CMU (100B), and is designed to be insulated between the high voltage (HV) domain and the low voltage (LV) domain.

[0067] Accordingly, the wireless communication Master function unit (120) on the low voltage (LV) side of the Master CMU (100A) performs the role of the wireless manager of the existing BMU, and the module measurement function unit (110) on the high voltage (HV) side performs the inherent functions of the CMU (measuring the voltage / temperature of the battery cell, cell balancing, etc., wireless transmission, etc.).

[0068] FIG. 4 describes the configuration of a Master CMU according to one embodiment of the present invention in more detail, and to aid in the explanation, the internal configuration of a Slave CMU (100B) is also described.

[0069] The Slave CMU (100B) has the same configuration as the existing CMU, and has a configuration that includes a sensing chip that uses power from a power IC to measure the state of a battery module (internal battery cell) (e.g., voltage / temperature, cell balancing, etc.) and a wireless IC Node that wirelessly transmits the measured cell state information.

[0070] Referring to FIG. 4, a Master CMU (100A) according to one embodiment of the present invention has a configuration including: a module measurement function unit (110) that measures the state of a battery module to which the Master CMU (100A) in the battery system (200) is connected; and a wireless communication Master function unit (120) that receives cell state information measured by a Slave CMU (100B) connected to another battery module in the battery system (200) and cell state information measured by the module measurement function unit (110) via wireless communication and transmits it to a BMU (10) implemented outside the battery system (200).

[0071] The module measurement function unit (110) has the same configuration as the existing CMU, uses a module-based power IC, and has a configuration including a sensing chip that measures the state of the battery module (internal battery cell) (e.g., voltage / temperature, cell balancing, etc.) and a wireless IC Node that wirelessly transmits the measured cell state information.

[0072] The wireless communication Master function unit (120) is configured to prevent a difference in current consumption between the Master CMU (100A) and the Slave CMU (100B), and is implemented to use a different power source than the module measurement function unit (110).

[0073] Preferably, the wireless communication Master function unit (120) can be implemented to receive and use vehicle power in a low voltage (LV) domain, unlike the power used by the module measurement function unit (110) in the module-based high voltage (HV) domain.

[0074] That is, the wireless communication Master function unit (120) uses a vehicle power-based power IC and has a configuration that includes a wireless interface unit for wireless communication within the battery system (200).

[0075] Also, referring to FIG. 4, the module measurement function unit (110) in the high voltage (HV) domain and the wireless communication Master function unit (120) in the low voltage (LV) domain within the Master CMU (100A) are designed to be insulated.

[0076] To explain more specifically, the wireless communication Master function unit (120) is configured to prevent cell monitoring within the battery system due to a single failure of the wireless interface unit, and may have two or more wireless interface units.

[0077] These wireless interface sections can be implemented using wireless ICs (Wireless Integrated Circuits), and as shown in FIG. 4, wireless IC Managers #1 and #2 are illustrated and explained as two or more wireless interface sections.

[0078] In this case, the wireless interface section, i.e., the wireless IC Manager, within the Master CMU (100A) is implemented in a redundant manner. If a problem occurs in either of the wireless IC Managers #1 or #2, the other one takes its place to ensure normal wireless communication operation, thereby preventing transmission failures and increasing communication reliability.

[0079] And the communication structure between the BMU (10) and the Master CMU (100A) is designed to be connected via wired communication (e.g., SPI (Serial Peripheral Interface)) between each wireless IC Manager #1 and #2 within the BMU (10) and the Master CMU (100A).

[0080] In this case, wireless IC Managers #1 and #2 within the Master CMU (100A) receive cell status information for all battery modules within the battery system (200) via wireless communication, and at this time, cell status information measured in the high voltage (HV) domain within the same Master CMU (100A) will also be included in the reception.

[0081] And wireless IC Managers #1 and #2 within the Master CMU (100A) transmit cell status information received via wireless communication to the BMU (10) outside the battery system (200) via wired communication (e.g., SPI #1, #2).

[0082] Meanwhile, as previously explained, the present invention implements a power design using vehicle power and an insulation design as a configuration to increase the current of the Master CMU (100A) by adding a wireless communication Master function unit (120) within the Master CMU (100A) and to prevent a difference in current consumption with the Slave CMU (100B) accordingly.

[0083] In this way, the measurement function of the HV domain within the Master CMU (100A) is entirely performed by the sensing chip within the HV domain, and the function acting as a wireless manager is entirely performed by receiving vehicle power within the LV domain. Therefore, since the current consumed by the module within the Master CMU (100A) is no different from that of the Slave CMU (100A), there is no capacity difference between the module equipped with the Master CMU (100A) and the Slave CMU (100B).

[0085] Hereinafter, a method of operation of a Master CMU-based wireless BMS according to an embodiment of the present invention will be described for implementing the new BMS wireless communication structure proposed in the present invention as described above.

[0086] FIGS. 5 and 6 illustrate a flowchart of the operation method of a Master CMU-based wireless BMS according to an embodiment of the present invention. For convenience of explanation, the reference numbers of FIGS. 3 and 4 will be referred to in the following description.

[0087] Referring to FIG. 5, according to the method of operation of the Master CMU-based wireless BMS of the present invention, when the ignition device (IG; Ignition) is turned on in the state of the connected constant power (B+) of the battery system (200), a wireless network for cell monitoring within the battery system (200) is formed in step S10.

[0088] For example, wireless IC Managers #1 and #2 within the Master CMU (100A) form a wireless network with the wireless IC Node of the module measurement function unit (110) within the Master CMU (100A) to connect wireless communication within the Master CMU (100A).

[0089] Additionally, wireless IC Managers #1 and #2 within the Master CMU (100A) form a wireless network with the wireless IC Node within each Slave CMU (100B) to establish wireless communication between the Master CMU (100A) and the Slave CMU (100B).

[0090] According to the method of operation of the Master CMU-based wireless BMS of the present invention, the wireless communication connection within the Master CMU (100A) and the wireless communication connection between the Master CMU (100A) and the Slave CMU (100B) performed in step S10 can be carried out in parallel.

[0091] And according to the method of operation of the Master CMU-based wireless BMS of the present invention, in step S20, the module measurement function unit (110) within the Master CMU (100A) and each Slave CMU (100B) each measure the status (e.g., voltage / temperature, cell balancing, etc.) of the battery module to which they are connected / directly connected and transmit it wirelessly to the Master CMU (100A).

[0092] According to the method of operation of the Master CMU-based wireless BMS of the present invention, in step S30, wireless IC Managers #1 and #2 within the Master CMU (100A) transmit each cell status information received via wireless communication to the BMU (10) via wired communication.

[0093] According to the method of operation of the Master CMU-based wireless BMS of the present invention, the BMU (10) checks whether cell status information for all battery modules in the battery system (200) is received normally from the Master CMU (100A).

[0094] According to the method of operation of the Master CMU-based wireless BMS of the present invention, if cell status information for the entire battery module of the battery system (200) is not received normally by the BMU (10) (S40 No), in step S50, the Master CMU (100A) diagnoses the wireless communication status for each wireless IC Manager #1 and #2 and performs an operation to secure cell monitoring within the battery system (200) (explained in FIG. 6 below).

[0095] Meanwhile, according to the method of operation of the Master CMU-based wireless BMS of the present invention, if cell status information for the entire battery module of the battery system (200) is successfully received by the BMU (10) at step S40 (S40 Yes), at step S60 the BMU (10) can determine whether there is an abnormality in the state of the battery module within the battery system (200) based on the real-time cell status information transmitted from the Master CMU (100A).

[0096] And the BMU (10) can perform subsequent actions based on the judgment of step S60, such as performing all actions for normal vehicle operation when the state is determined to be normal, and performing all actions for transitioning the vehicle to a safe state when the state is determined to be abnormal.

[0097] With reference to FIG. 6, step S50, which is performed in the operation method of the Master CMU-based wireless BMS of the present invention, will be explained in more detail.

[0098] According to the method of operation of the Master CMU-based wireless BMS of the present invention, if cell status information for the entire battery module of the battery system (200) is successfully received by the BMU (10) in step S40 (S40 Yes), the Master CMU (100A) performs a diagnosis of the wireless communication status for wireless IC Managers #1 and #2 in steps S51 and S52.

[0099] Specifically, in step S51, the Master CMU (100A) performs a process of diagnosing the wireless communication status of Wireless IC Manager #1 based on the success rate and number of retransmissions of wireless data packets received from multiple CMUs (Slave CMU (100B), module measurement function unit (110) within Master CMU (100A)) through one of Wireless IC Managers #1 and #2, for example, Wireless IC Manager #1.

[0100] Subsequently, if the Master CMU (100A) diagnoses a reception error for Wireless IC Manager #1 as a result of the diagnosis in step S51 (S52 Yes), it performs the process of resetting Wireless IC Manager #1 in step S53.

[0101] Meanwhile, if the Master CMU (100A) does not diagnose a reception error for Wireless IC Manager #1 as a result of the diagnosis in step S51 (S52 No), it performs the process of resetting Wireless IC Manager #2, which is the other among Wireless IC Manager #1 and #2, in step S54.

[0102] Subsequently, according to the method of operation of the Master CMU-based wireless BMS of the present invention, in step S55, the BMU (10) checks whether cell status information for all battery modules in the battery system (200) is received normally from the Master CMU (100A).

[0103] According to the method of operation of the Master CMU-based wireless BMS of the present invention, if cell status information for the entire battery module of the battery system (200) is not received normally by the BMU (10) (S55 No), at step S56, it is possible to display that cell monitoring within the battery system (200) is impossible and perform all operations to transition the vehicle to a safe state.

[0104] Meanwhile, according to the method of operation of the Master CMU-based wireless BMS of the present invention, when cell status information for the entire battery module of the battery system (200) is normally received by the BMU (10) (S55 Yes), the BMU (10) can determine whether there is an abnormal state of the battery module in the battery system (200) based on the real-time cell status information transmitted from the Master CMU (100A) by performing the aforementioned step S60.

[0105] In this way, the present invention implements a redundancy for the wireless interface unit, namely Wireless IC Managers #1 and #2, within the Master CMU (100A), and performs an operation to diagnose and reset the wireless communication status of Wireless IC Managers #1 and #2 when necessary. By resetting and normalizing the wireless IC Managers #1 and #2 when an abnormality occurs in either one, and supporting normal wireless communication through the other one during that time, it is possible to prevent the inability to monitor cells within the battery system (200) due to a single failure of the wireless IC within the Master CMU (100A).

[0106] Meanwhile, according to another embodiment of the present invention, one of Wireless IC Managers #1 and #2 (e.g., Wireless IC Manager #1) within the Master CMU (100A) receives each cell status information via wireless communication and transmits it to the BMU (10). However, when a reception error is diagnosed for Wireless IC Manager #1, the operation of receiving each cell status information via wireless communication is continued by switching from Wireless IC Manager #1 to another Wireless IC Manager #2, and a subsequent operation to resolve the reception error is performed for Wireless IC Manager #1.

[0108] According to the prior art, a BMU acting as a wireless manager is positioned at the forefront or rear of the battery system, which can lead to degraded wireless communication performance with a CMU located far away. In this case, a situation may arise where the BMU cannot properly receive cell status information measured and transmitted by the CMU, resulting in a problem where cell monitoring of the battery module connected to the CMU becomes impossible.

[0109] According to the various embodiments of the present invention described above, by implementing a Master CMU in a location advantageous for optimizing the structure / performance of wireless communication within a battery system, the overall performance of wireless communication within the battery system and cell monitoring performance can be significantly improved by securing the freedom of positioning of the Master CMU.

[0110] According to conventional technology, a maintenance depot for BMU (CPU-equipped) A / S must be configured at the bottom of the battery system, which resulted in a problem where it was impossible to ensure battery safety due to watertight failure in the event of a collision with the underside of the vehicle.

[0111] According to the various embodiments of the present invention described above, by implementing a structure that performs BMS wireless communication using only the CMU through the implementation of a Master CMU within the battery system, the maintenance facility for BMU A / S at the bottom of the battery system can also be removed due to the removal of the BMU within the battery system, thereby ensuring battery safety.

[0112] Furthermore, according to the prior art, the operating voltage of the existing BMU within the battery system is the total pack voltage, making it essential to ensure internal insulation and high-voltage stability for the wiring and electrical connection parts of the battery system.

[0113] On the other hand, according to the present invention, by implementing a structure that performs BMS wireless communication using only the CMU through the implementation of a Master CMU within the battery system, the degree of freedom for insulation and high-voltage stability considering the total voltage of the battery pack can be secured by not applying a BMU inside the battery system.

[0115] In the specification of this disclosure (particularly in the claims), the use of the term "above" and similar descriptive terms may be in both singular and plural. Furthermore, where a range is described in this disclosure, it is to include an invention to which individual values ​​belonging to said range are applied (unless otherwise stated), as is equivalent to describing each individual value constituting said range in the detailed description of the invention.

[0116] Unless explicitly stated otherwise, the steps constituting the method according to the present disclosure may be performed in a suitable order. The present disclosure is not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms (e.g., etc.) in the present disclosure is merely for the purpose of describing the present disclosure in detail, and the scope of the present disclosure is not limited by such examples or exemplary terms unless limited by the claims. Furthermore, a person skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the claims or equivalents to which they are added.

[0117] Accordingly, the scope of the present disclosure should not be limited to the embodiments described above, and all scopes equivalent to or equivalently modified from the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the scope of the present disclosure. Explanation of the symbols

[0118] 10: BMU 100A: Master CMU 100B: Slave CMU 110: Module measurement function section 120: Wireless Communication Master Function Unit 200: Battery System 300: Wireless Battery Management System

Claims

Claim 1 A wireless battery management system based on a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function, comprising: a plurality of CMUs connected to each battery module constituting the battery system to measure the state of the battery module; and a Battery Management Unit (BMU) implemented outside the battery system, wherein a specific CMU among the plurality of CMUs receives cell state information measured by the plurality of CMUs via wireless communication and transmits it to the BMU. Claim 2 In claim 1, the BMU is a CMU-based wireless battery management system equipped with a wireless communication Master function that receives cell status information for the battery system from the specific CMU and determines whether there is a status abnormality of the battery module within the battery system. Claim 3 A wireless battery management system based on a CMU having a wireless communication Master function, wherein the specific CMU comprises two or more wireless interface units for wireless communication, and diagnoses the wireless communication status of the two or more wireless interface units and resets them upon error diagnosis. Claim 4 In paragraph 3, the above BMU is a CMU-based wireless battery management system equipped with a wireless communication Master function that checks whether cell status information for the entire battery module within the battery system is normally received from the specific CMU. Claim 5 In paragraph 4, the specific CMU is a wireless battery management system based on a CMU having a wireless communication Master function that performs a diagnosis of the wireless communication status when cell status information for the entire battery module is not normally received by the BMU. Claim 6 A CMU-based wireless battery management system equipped with a wireless communication Master function, wherein the diagnosis of the wireless communication status is performed by: a process of diagnosing the wireless communication status of the first wireless interface unit based on the success rate and number of retransmissions of wireless data packets received from the plurality of CMUs through the first wireless interface unit among the two or more wireless interface units; a process of resetting the first wireless interface unit when a reception error is diagnosed for the first wireless interface unit through the diagnosis process; and a process of resetting another second wireless interface unit among the two or more wireless interface units when a reception error is not diagnosed for the first wireless interface unit through the diagnosis process. Claim 7 In paragraph 3, the communication structure between the BMU and the specific CMU is a structure in which wired communication is connected between each wireless interface unit within the BMU and the specific CMU, a CMU-based wireless battery management system equipped with a wireless communication Master function. Claim 8 A wireless battery management system based on a CMU having a wireless communication Master function, wherein the specific CMU comprises a module measurement function unit that measures the state of the battery module to which the specific CMU is connected, and a wireless communication Master function unit that receives cell state information measured by the module measurement function unit and a CMU other than the specific CMU among the plurality of CMUs via wireless communication and transmits it to the BMU. Claim 9 A CMU (Cell Monitoring Unit) equipped with a wireless communication Master function, comprising: a module measurement function unit that measures the state of a battery module to which the CMU is connected within a battery system; and a wireless communication Master function unit that receives cell state information measured by another CMU connected to another battery module within the battery system and cell state information measured by the module measurement function unit via wireless communication, and transmits it to a BMU implemented outside the battery system. Claim 10 In claim 9, the wireless communication Master function unit comprises two or more wireless interface units for wireless communication, and a CMU equipped with a wireless communication Master function that diagnoses the wireless communication status of the two or more wireless interface units and resets them upon error diagnosis. Claim 11 In claim 9, the wireless communication Master function unit is a CMU equipped with a wireless communication Master function that uses a power source different from that of the module measurement function unit. Claim 12 In claim 9, the wireless communication Master function unit is a CMU equipped with a wireless communication Master function that receives and uses vehicle power different from the power used by the module measurement function unit. Claim 13 In claim 9, a CMU equipped with a wireless communication Master function, wherein the module measurement function unit of the high voltage (HV) domain and the wireless communication Master function unit of the low voltage (LV) domain within the CMU are designed to be insulated. Claim 14 A method of operation of a wireless battery management system based on a Cell Monitoring Unit (CMU) equipped with a wireless communication Master function, comprising: a step in which a plurality of CMUs connected to each battery module constituting the battery system measure the state of the battery module; a step in which a specific CMU among the plurality of CMUs receives cell state information measured by the plurality of CMUs via wireless communication; and a step in which the specific CMU transmits the cell state information received via wireless communication to a Battery Management Unit (BMU) implemented outside the battery system. Claim 15 A method of operation of a wireless battery management system based on a CMU equipped with a wireless communication Master function, wherein, in claim 14, the BMU further comprises the step of checking whether cell status information regarding the entire battery module within the battery system is normally received from the specific CMU; and if the cell status information regarding the entire battery module is not normally received by the BMU, the specific CMU further comprises the step of diagnosing the wireless communication status of two or more wireless interface units for wireless communication. Claim 16 A method of operation of a CMU-based wireless battery management system equipped with a wireless communication Master function, wherein the diagnosis of the wireless communication status is performed by: a process of diagnosing the wireless communication status of the first wireless interface unit based on the success rate and number of retransmissions of wireless data packets received from the plurality of CMUs through the first wireless interface unit among the two or more wireless interface units; a process of resetting the first wireless interface unit when a reception error is diagnosed for the first wireless interface unit through the diagnosis process; and a process of resetting another second wireless interface unit among the two or more wireless interface units when a reception error is not diagnosed for the first wireless interface unit through the diagnosis process. Claim 17 In claim 15, the method of operation of a CMU-based wireless battery management system equipped with a wireless communication Master function, wherein the communication structure between the BMU and the specific CMU is a structure in which wired communication is connected between each wireless interface unit within the BMU and the specific CMU.

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