Battery management system with auxiliary battery cell monitoring function

Abstract

The present invention relates to a battery management system equipped with an auxiliary battery cell monitoring function. A battery management system having an auxiliary battery cell monitoring function according to one embodiment of the present invention includes: a power circuit unit that receives power from an auxiliary battery and supplies it to the battery management system (BMS); a controller that determines the cell status of the battery module and the auxiliary battery based on information that monitors the battery cell of the high-voltage battery module and information that monitors the battery cell of the auxiliary battery; and an isolated circuit structure that isolates each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cell of the auxiliary battery.

Description

Technology Field

[0001] The present invention relates to a battery management system, and more specifically, to a battery management system (BMS) that monitors battery cells within a high-voltage battery module and is equipped with a battery cell monitoring function for an auxiliary battery and can operate stably. Background Technology

[0002] The core competitive advantage of electric vehicles, such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), and PHEVs (Plug-in Hybrid Electric Vehicles), is driving range, and securing space to accommodate as many batteries as possible is very important.

[0003] In this regard, there has recently been a trend of changing the 12V auxiliary battery installed in electric vehicles from the existing lead-acid (Pb) battery to a lithium-ion (Li-ion) battery for purposes such as increasing space utilization and reducing weight within the vehicle.

[0004] When designing and applying an integrated battery system including a high-voltage battery module and a 12V lithium auxiliary battery, the auxiliary battery used to power the controller in the vehicle requires a stable power supply, so a function to monitor the voltage / temperature of the battery cells within the auxiliary battery is required.

[0005] To this end, a separate BMS that monitors the battery cells within the 12V lithium auxiliary battery could be implemented, but this is not a suitable solution considering that electric vehicles have very limited space compared to other electric products.

[0006] Ultimately, a method is required in which a BMS that monitors battery cells within an existing high-voltage battery module can also be equipped with and perform the function of monitoring battery cells of a 12V lithium auxiliary battery integrated into the battery system.

[0007] However, in an integrated battery system including a high-voltage battery module and a 12V lithium auxiliary battery, there is currently no specific technical solution for the BMS that monitors the cells within the high-voltage battery module to also have a function to monitor the battery cells of the auxiliary battery and to operate stably without the BMS burning out. Prior art literature

[0008] Korean Published Patent Application No. 10-2022-0074709 The problem to be solved

[0009] The present invention was devised to solve the problems described above, and the objective of the present invention is to provide a battery management system (BMS) equipped with an auxiliary battery cell monitoring function, wherein the BMS monitoring the cells within the high-voltage battery module in an integrated battery system including a high-voltage battery module and an auxiliary battery (e.g., 12V lithium) also has a battery cell monitoring function of the auxiliary battery and can operate stably.

[0010] 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

[0011] For the above purpose, a battery management system having an auxiliary battery cell monitoring function according to one embodiment of the present invention comprises: a power circuit unit that receives power from an auxiliary battery and supplies it to the battery management system (BMS); a controller that determines the cell status of the battery module and the auxiliary battery based on information that monitors the battery cell of the high-voltage battery module and information that monitors the battery cell of the auxiliary battery; and a specific circuit structure that blocks the electrical connection between the ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cell of the auxiliary battery, while having a mutual potential difference.

[0012] Preferably, the specific circuit structure is an isolated circuit structure that isolates each GND of the power circuit section and the auxiliary battery cell monitoring section.

[0013] Preferably, the GND of the power circuit is VEHICLE_CHASSIS_GND, and the GND of the auxiliary battery cell monitoring unit is connected to VEHICLE_CHASSIS_GND when the auxiliary battery is installed in the vehicle, and is connected to BSA(Battery System ASS'y)_CHASSIS_GND when the auxiliary battery is not installed in the vehicle.

[0014] Preferably, the isolated circuit structure is designed to isolate the portion on the board of the BMS where the power circuit and the controller are mounted from the portion where the auxiliary battery cell monitoring unit is mounted, and implements the communication path between the controller and the auxiliary battery cell monitoring unit as an isolated communication circuit, thereby isolating the respective GNDs of the power input unit and the auxiliary battery cell monitoring unit.

[0015] Preferably, the isolated communication circuit implements the communication path between the controller and the auxiliary battery cell monitoring unit using a communication isolation capacitor.

[0016] Preferably, the (-) terminal of the auxiliary battery is connected to the BSA_CHASSIS_GND, and when the auxiliary battery is installed in a vehicle, it is connected to the VEHICLE_CHASSIS_GND through a separate cable.

[0017] Preferably, the specific circuit structure is a non-isolated circuit structure that adjusts the potential difference between each GND of the power circuit section and the auxiliary battery cell monitoring section.

[0018] Preferably, the non-isolated circuit structure is a structure in which the GND planes of the power circuit section and the auxiliary battery cell monitoring section are connected at one point using a resistor (R), thereby reducing the potential difference between the GNDs of the power circuit section and the auxiliary battery cell monitoring section through the resistor (R).

[0019] Meanwhile, a battery management system for managing an integrated battery system (BSA, Battery System ASS'y) including a high-voltage battery module and an auxiliary battery according to one embodiment of the present invention includes a power circuit unit that receives power from the auxiliary battery and supplies it to the battery management system (BMS, Battery Management System); and an isolated circuit structure that isolates each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cells of the auxiliary battery, thereby blocking the situation in which the different GNDs of the power circuit unit and the auxiliary battery cell monitoring unit are electrically connected within the board of the BMS when the auxiliary battery is not installed in the vehicle, and blocking the situation in which the load current of the auxiliary battery flows into the board of the BMS when the auxiliary battery is installed in the vehicle.

[0020] Meanwhile, a battery management system for managing an integrated battery system (BSA, Battery System ASS'y) including a high-voltage battery module and an auxiliary battery according to one embodiment of the present invention includes a power circuit unit that receives power from the auxiliary battery and supplies it to the battery management system (BMS, Battery Management System); and a non-isolated circuit structure that adjusts the potential difference between each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cells of the auxiliary battery, thereby blocking the situation in which the different GNDs of the power circuit unit and the auxiliary battery cell monitoring unit are electrically connected within the board of the BMS when the auxiliary battery is not installed in the vehicle, and blocking the situation in which the load current of the auxiliary battery flows into the board of the BMS when the auxiliary battery is installed in the vehicle. Effects of the invention

[0021] According to the present invention, in an integrated battery system including a high-voltage battery module and an auxiliary battery (e.g., 12V lithium), a BMS that monitors cells within the high-voltage battery module also has a battery cell monitoring function of the auxiliary battery and implements a specific technical method for stable operation.

[0022] Thus, according to the present invention, there is an effect of preventing the auxiliary battery from discharging in the standalone state of the integrated battery system, and furthermore, an effect of preventing damage to the BMS caused by the load current of the auxiliary battery flowing into the BMS board when there is a cable / bolting defect between the auxiliary battery CHASSIS (e.g., cable opening / increase in resistance). Brief explanation of the drawing

[0023] FIG. 1 is a diagram illustrating the structure of an integrated battery system to which the present invention is applied. FIG. 2 is a diagram illustrating the circuit configuration of an integrated battery system to which the present invention is applied. Figure 3 is a diagram illustrating the situation where the auxiliary battery is discharged and the BMS is damaged in an integrated battery system. FIGS. 4 and 5 are drawings illustrating an isolated circuit structure within a BMS equipped with an auxiliary battery cell monitoring function according to an embodiment of the present invention. FIGS. 6 and 7 are drawings illustrating a non-isolated circuit structure within a BMS equipped with an auxiliary battery cell monitoring function according to another embodiment of the present invention. Specific details for implementing the invention

[0024] 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.

[0025] 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.

[0026] 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.

[0028] Hereinafter, a battery management system equipped with an auxiliary battery cell monitoring function according to the present invention will be described in detail with reference to FIGS. 1 to 7.

[0029] Before providing a detailed description of the present invention, the structure of an integrated battery system to which the present invention is applied will first be explained with reference to FIG. 1. The structure and circuit configuration of the integrated battery system described below with reference to FIG. 1 and FIG. 2 may also be considered as a proposed feature of the present invention.

[0030] The present invention relates to an integrated battery system (hereinafter referred to as BSA (Battery System ASS'y)) designed to include a high-voltage battery module and an auxiliary battery (e.g., 12V lithium). For convenience of explanation, the following description will refer to a 12V lithium auxiliary battery.

[0031] Figure 1 illustrates the structure of the BSA (200) to which the present invention is applied in relation to this.

[0032] As shown in FIG. 1, an integrated battery system, i.e., BSA (200), including a 12V lithium auxiliary battery, is composed of a high-voltage battery module (10, BMA (Battery Module Ass'y)), a 12V lithium auxiliary battery (20), a PRA (Power Relay Ass'y, 30), and a battery management system, i.e., BMS (100).

[0033] The PRA (30) contains electrical components such as a current sensor, a latch relay, and a fuse, and power from the 12V lithium auxiliary battery (20) is supplied to a vehicle controller including the BMS (100) in the order of current sensor → fuse → latch relay.

[0034] In the present invention, the BMS (100) performs the function of monitoring the battery cells within the BMA (10) as in the past, and further performs the function of monitoring the battery cells of the 12V lithium auxiliary battery (20).

[0035] Specifically, the BMS (100) can perform the function of determining the cell status by monitoring the battery cell status (e.g., cell voltage / temperature, etc.) of the 12V lithium auxiliary battery (20), control the ON / OFF of the latch relay in the PRA (30), and monitor the output current of the 12V lithium auxiliary battery (20) (this can be done through voltage -> current conversion received from the current sensor in the PRA (30)).

[0037] Figure 2 illustrates the circuit configuration of an integrated battery system (BSA) having a tactical structure.

[0038] In FIG. 2, for convenience of diagramming and explanation, the circuit configuration of the BSA is shown with the 12V lithium auxiliary battery (20) at the center.

[0039] As shown in FIG. 2, in the present invention, in a BSA that includes / integrates a 12V lithium auxiliary battery (20), a BMS that monitors cells within a high-voltage battery module, i.e., a BMA (10 in FIG. 1), also has / performs a battery cell monitoring function of the 12V lithium auxiliary battery (20).

[0040] Specifically, the BMS is configured to include a high-voltage cell monitoring unit (not shown) that monitors battery cells within the BMA (10), an auxiliary battery cell monitoring unit (12V auxiliary battery cell monitoring IC) that monitors battery cells of the 12V lithium auxiliary battery (20), and a controller (Main MCU) that determines the cell status of the BMA (10) and the 12V lithium auxiliary battery (20) based on monitoring information from the high-voltage cell monitoring unit (not shown) and the auxiliary battery cell monitoring unit.

[0041] In addition, the BMS is configured to include a power circuit section (115) that receives power (B+_BATT power (12V Aux.)) from a 12V lithium auxiliary battery (20) and supplies it to the BMS.

[0042] And as can be seen in FIG. 2, the power of the 12V lithium auxiliary battery (20) is output to the vehicle-side constant load via the current sensor in the PRA (30) → fuse, and the power of the 12V lithium auxiliary battery (20) can also be output to the vehicle-side non-constant load via the vehicle junction box at the rear end via the current sensor in the PRA (30) → fuse → latch relay intended for cutting off the current.

[0043] Structurally, the (-) terminal of the 12V lithium auxiliary battery (20) is connected to BSA_CHASSIS_GND, and when the 12V lithium auxiliary battery (20) is installed in a vehicle, the (-) terminal of the 12V lithium auxiliary battery (20) is connected to VEHICLE_CHASSIS_GND through a separate cable.

[0044] As described above, the battery management system equipped with an auxiliary battery cell monitoring function of the present invention can be applied to a BSA with a structure and circuit configuration described with reference to FIGS. 1 and FIGS. 2 above.

[0046] Figure 3 illustrates a problem situation that may occur in the structure and circuit configuration of a BSA to which the present invention is applied.

[0047] In the BSA to which the present invention is applied, the BMS that monitors the cells within the high-voltage BMA (10) also performs the function of monitoring the battery cells of the 12V lithium auxiliary battery (20), and has a power path that receives and uses the power (B+_BATT power (12V Aux.)) of the 12V lithium auxiliary battery (20).

[0048] In addition, the (-) terminal of the 12V lithium auxiliary battery (20) is connected to BSA_CHASSIS_GND, and when the 12V lithium auxiliary battery (20) is installed in a vehicle, the (-) terminal of the 12V lithium auxiliary battery (20) is connected to VEHICLE_CHASSIS_GND through the use of a cable.

[0049] Accordingly, the GND of the auxiliary battery cell monitoring unit (12V auxiliary battery cell monitoring IC) that monitors the battery cells of the 12V lithium auxiliary battery (20) within the BMS is connected to VEHICLE_CHASSIS_GND when the 12V lithium auxiliary battery (20) is installed in the vehicle, and is connected to BSA_CHASSIS_GND when the 12V lithium auxiliary battery (20) is not installed in the vehicle.

[0050] According to the structure and circuit configuration of this BSA, a situation may occur where the BSA is in a standalone state separated from the vehicle, that is, when the 12V lithium auxiliary battery (20) is not installed in the vehicle, and each different GND (BSA_CHASSIS_GND and VEHICLE_CHASSIS_GND) is electrically connected within the board of the BMS.

[0051] In this way, if BSA_CHASSIS_GND and VEHICLE_CHASSIS_GND are electrically connected within the board of the BMS, dark current may flow even in the standalone state of the BSA, and a situation may occur where the 12V lithium auxiliary battery (20) is discharged.

[0052] In addition, when the resistance increases due to reasons such as open circuits or bolting failures in the cables used when the 12V lithium auxiliary battery (20) is mounted in the vehicle, a situation may occur where the load current of the 12V lithium auxiliary battery (20) that cannot flow to the (-) terminal VEHICLE_CHASSIS_GND of the 12V lithium auxiliary battery (20) flows into the board of the BMS, so there is a risk of BMS burnout.

[0053] Ultimately, in integrated battery systems (BSA) that include an auxiliary battery, there is currently a lack of specific technical measures to ensure stable operation and prevent BMS burnout caused by the auxiliary battery discharging in the BSA's standalone state or faulty cables / bolting between the auxiliary battery's chassis, even though the BMS monitoring cells within the high-voltage battery module is equipped with a battery cell monitoring function for the auxiliary battery.

[0054] In the present invention, a battery management system (BMS) equipped with an auxiliary battery cell monitoring function is proposed, which can prevent problematic situations such as auxiliary battery discharge and BMS burnout during auxiliary battery cell monitoring in the aforementioned integrated battery system (BSA) and operate stably.

[0056] A BMS having an auxiliary battery cell monitoring function according to an embodiment of the present invention includes: a power circuit unit that receives power from an auxiliary battery and supplies it to the BMS; a controller that determines the cell status of the battery module and the auxiliary battery based on information that monitors the battery cell of a high-voltage battery module and information that monitors the battery cell of the auxiliary battery; and a specific circuit structure that blocks the electrical connection of each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cell of the auxiliary battery having a mutual potential difference.

[0057] Here, a specific circuit structure of the present invention may be implemented as an isolated circuit structure that isolates each GND of the power circuit unit and the auxiliary battery cell monitoring unit (see FIGS. 4 and 5 described below).

[0058] Meanwhile, a specific circuit structure of the present invention may be implemented as a non-isolated circuit structure that adjusts the potential difference between each GND of the power circuit section and the auxiliary battery cell monitoring section (see FIGS. 6 and 7 described later).

[0060] Hereinafter, with reference to FIGS. 4 and FIGS. 5, the internal structure and circuit design of a BMS equipped with an auxiliary battery cell monitoring function according to an embodiment of the present invention will be described.

[0061] FIG. 4 illustrates an embodiment of the present invention, which describes a method to prevent problems such as auxiliary battery discharge and BMS burnout during auxiliary battery cell monitoring by implementing an isolated circuit structure inside the BMS (100).

[0062] Referring to FIG. 4, the BMS (100) of the present invention is configured to include a power circuit unit (115) that receives power (B+_BATT power (12V Aux.) of a 12V lithium auxiliary battery (20) and supplies it to the BMS (100), and an auxiliary battery cell monitoring unit (120) that monitors the battery cells of the 12V lithium auxiliary battery (20).

[0063] The auxiliary battery cell monitoring unit (120) is a circuit that monitors the voltage, etc., for each of the multiple battery cells included in the 12V lithium auxiliary battery (20), and can be implemented as an auxiliary battery cell monitoring IC (e.g., BMIC (Battery Monitoring Integrated Circuit)).

[0064] And the BMS (100) of the present invention is characterized by including an insulating circuit structure (130) that isolates each ground (GND) of the power circuit section (115) and the auxiliary battery cell monitoring section (120).

[0065] As shown in FIG. 4, for convenience of explanation, the part where the power path (B+_BATT power (12V Aux.)) is input, the power circuit part (115), and the controller (111, Main MCU) are located inside the BMS (100) will be referred to as the BMS low voltage part (110).

[0066] Specifically, the isolated circuit structure (130) is designed to isolate the part of the BMS (100) board where the power circuit part (115) and the controller (111, Main MCU) are mounted, i.e., the BMS low voltage part (110), and the part where the auxiliary battery cell monitoring part (120) is mounted, and implements the communication path between the controller (111, Main MCU) and the auxiliary battery cell monitoring part (120, in particular the auxiliary battery cell monitoring IC) as an isolated communication circuit.

[0067] Accordingly, the BMS (100) of the present invention isolates each GND of the power circuit section (115) and the auxiliary battery cell monitoring section (120) through an isolated circuit structure (130) implemented as an isolated communication circuit of the aforementioned above.

[0068] To explain more specifically, as shown in FIG. 5, the isolated communication circuit of the isolated circuit structure (130) can implement the communication path between the controller (111, Main MCU) and the auxiliary battery cell monitoring unit (120, particularly the auxiliary battery cell monitoring IC) as a communication isolation capacitor.

[0069] Thus, according to one embodiment of the present invention, an internal structure and circuit design are implemented in which the GND of the power circuit section (115) and the auxiliary battery cell monitoring section (120) are isolated through an isolated circuit structure (130) in the BMS (100).

[0070] As a result, according to the present invention, the occurrence of a situation in which BSA_CHASSIS_GND and VEHICLE_CHASSIS_GND are electrically connected within the board of the BMS (100) is fundamentally blocked, thereby preventing the 12V lithium auxiliary battery (20) from being discharged even in the standalone state of the BSA (200) to which the BMS (100) of the present invention is applied.

[0071] In addition, according to the present invention, the path in which the load current of the 12V lithium auxiliary battery (20) flows into the BMS (100) is fundamentally blocked, thereby preventing the BMS from being damaged due to the inflow of the load current of the 12V lithium auxiliary battery (20) even in the event of a cable failure or bolting failure between the VEHICLE_CHASSIS and BSA_CHASSIS.

[0072] Meanwhile, the high-voltage battery cell monitoring unit, which is illustrated in FIG. 5 as a circuit for monitoring each battery cell of a high-voltage battery, i.e., a BMA (10), and the communication structure between the controller (111, Main MCU) and the high-voltage battery cell monitoring unit are not different from the structure / circuit configuration of the existing technology, so a detailed explanation will be omitted.

[0074] Hereinafter, with reference to FIGS. 6 and FIGS. 7, the internal structure and circuit design of a BMS equipped with an auxiliary battery cell monitoring function according to another embodiment of the present invention will be described.

[0075] FIG. 6 illustrates another embodiment of the present invention, which describes a method to prevent problems such as auxiliary battery discharge and BMS burnout during auxiliary battery cell monitoring by implementing a non-isolated circuit structure inside the BMS (100).

[0076] Referring to FIG. 6, the BMS (100) of the present invention is configured to include a power circuit unit (115) that receives power (B+_BATT power (12V Aux.) of a 12V lithium auxiliary battery (20) and supplies it to the BMS (100), and an auxiliary battery cell monitoring unit (120) that monitors the battery cells of the 12V lithium auxiliary battery (20).

[0077] The auxiliary battery cell monitoring unit (120) is a circuit that monitors the voltage, etc., for each of the multiple battery cells included in the 12V lithium auxiliary battery (20), and can be implemented as an auxiliary battery cell monitoring IC (e.g., BMIC (Battery Monitoring Integrated Circuit)).

[0078] And the BMS (100) of the present invention is characterized by including a non-isolated circuit structure (130) that adjusts the potential difference between each ground (GND) of the power circuit section (115) and the auxiliary battery cell monitoring section (120).

[0079] As shown in FIG. 6, the power path receiving power (B+_BATT power (12V Aux.)) inside the BMS (100), the power circuit section (115), and the controller (111, Main MCU) are located in the part that can be called the BMS low voltage section (110).

[0080] Specifically, the non-isolated circuit structure (130) is a single-point grounding structure in which the GND planes of the BMS low-voltage section (110) equipped with the power circuit section (115) and the auxiliary battery cell monitoring section (120) are connected at one point using a resistor (R).

[0081] Accordingly, the BMS (100) of the present invention reduces and adjusts the potential difference between each GND of the power circuit section (115) and the auxiliary battery cell monitoring section (120) through a non-isolated circuit structure (130) of a Single-Point Grounding structure using the aforementioned resistor (R).

[0082] To explain more specifically, as shown in FIG. 7, the non-isolated circuit structure (130) of the Single-Point Grounding structure using a resistor (R) serves to match the level between each GND Plane of the BMS low-voltage section (110) and the auxiliary battery cell monitoring section (120), and also, when unexpected current flows in, the resistor (R) fails and It can act as a fuse to prevent the GND of the BMS low voltage section (110) and the auxiliary battery cell monitoring section (120) from being short-circuited.

[0083] Thus, according to another embodiment of the present invention, an internal structure and circuit design are implemented to adjust the potential difference between each GND of the power circuit section (115) and the auxiliary battery cell monitoring section (120) through a non-isolated circuit structure (130) in the BMS (100).

[0084] As a result, according to the present invention, electrical connection caused by the potential difference between BSA_CHASSIS_GND and VEHICLE_CHASSIS_GND within the board of the BMS (100) is fundamentally blocked (level matching), thereby preventing the 12V lithium auxiliary battery (20) from discharging even in the Standalone state of the BSA (200) to which the BMS (100) of the present invention is applied.

[0085] In addition, according to the present invention, the path through which the load current of the 12V lithium auxiliary battery (20) flows into the BMS (100) is fundamentally blocked (acting as a fuse), thereby preventing the BMS from being damaged due to the inflow of the load current of the 12V lithium auxiliary battery (20) even in the event of a cable failure or faulty bolting between the VEHICLE_CHASSIS and BSA_CHASSIS.

[0086] In particular, according to the present embodiment of the invention implementing a non-isolated circuit structure as illustrated in FIGS. 6 and 7, it has the advantage of being able to achieve the same effect with a low-cost circuit configuration compared to the embodiment implementing an isolated circuit structure of the present invention.

[0087] Meanwhile, the high-voltage battery cell monitoring unit, which is illustrated in FIG. 7 as a circuit for monitoring each battery cell of a high-voltage battery, i.e., a BMA (10), and the communication structure between the controller (111, Main MCU) and the high-voltage battery cell monitoring unit are not different from the structure / circuit configuration of the existing technology, so a detailed explanation will be omitted.

[0089] According to the various embodiments of the present invention described above, in an integrated battery system including a high-voltage battery module and a 12V lithium auxiliary battery, a specific technical method is implemented for a BMS that monitors cells within the high-voltage battery module to also have a battery cell monitoring function of the auxiliary battery and to operate stably.

[0090] Thus, according to the present invention, there is an effect of preventing the auxiliary battery from discharging in the standalone state of the integrated battery system, and furthermore, an effect of preventing damage to the BMS caused by the load current of the auxiliary battery flowing into the BMS board when there is a cable / bolting defect between the auxiliary battery CHASSIS (e.g., cable opening / increase in resistance).

[0092] 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.

[0093] 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.

[0094] 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

[0095] 20: Power Bank 100: Battery Management System (BMS) 110: BMS Low Voltage Section 120: Auxiliary battery cell monitoring unit 130: Isolated circuit structure 200: Integrated Battery System (BSA)

Claims

Claim 1 A battery management system equipped with an auxiliary battery cell monitoring function, comprising: a power circuit unit that receives power from an auxiliary battery and supplies it to the battery management system (BMS); a controller that determines the cell status of the battery module and the auxiliary battery based on information regarding monitoring the battery cells of a high-voltage battery module and information regarding monitoring the battery cells of the auxiliary battery; and a specific circuit structure that blocks the electrical connection between the grounds (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cells of the auxiliary battery, while having a mutual potential difference. Claim 2 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 1, the specific circuit structure is an insulating circuit structure that isolates each GND of the power circuit section and the auxiliary battery cell monitoring section. Claim 3 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 1, the GND of the power circuit is VEHICLE_CHASSIS_GND, and the GND of the auxiliary battery cell monitoring unit is connected to VEHICLE_CHASSIS_GND when the auxiliary battery is installed in a vehicle, and connected to BSA(Battery System ASS'y)_CHASSIS_GND when the auxiliary battery is not installed in a vehicle. Claim 4 In paragraph 2, the isolated circuit structure is a structure that isolates the portion on the board of the BMS where the power circuit portion and the controller are mounted and the portion where the auxiliary battery cell monitoring portion is mounted, and implements the communication path between the controller and the auxiliary battery cell monitoring portion as an isolated communication circuit, thereby isolating each GND of the power input portion and the auxiliary battery cell monitoring portion, and is a battery management system having an auxiliary battery cell monitoring function. Claim 5 In paragraph 4, the battery management system having an auxiliary battery cell monitoring function, wherein the isolated communication circuit implements a communication path between the controller and the auxiliary battery cell monitoring unit using a communication isolation capacitor. Claim 6 A battery management system having an auxiliary battery cell monitoring function, wherein, in paragraph 3, the (-) terminal of the auxiliary battery is connected to the BSA_CHASSIS_GND, and when the auxiliary battery is installed in a vehicle, it is connected to the VEHICLE_CHASSIS_GND through a separate cable. Claim 7 A battery management system having an auxiliary battery cell monitoring function, wherein the specific circuit structure is a non-isolated circuit structure that adjusts the potential difference between each GND of the power circuit section and the auxiliary battery cell monitoring section in claim 1. Claim 8 In claim 7, the above-described non-isolated circuit structure is a structure in which the GND planes of the power circuit section and the auxiliary battery cell monitoring section are connected at one point using a resistor (R), and the battery management system equipped with an auxiliary battery cell monitoring function that reduces the potential difference between the GNDs of the power circuit section and the auxiliary battery cell monitoring section through the resistor (R). Claim 9 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 7, the GND of the power circuit is VEHICLE_CHASSIS_GND, and the GND of the auxiliary battery cell monitoring unit is connected to VEHICLE_CHASSIS_GND when the auxiliary battery is installed in a vehicle, and connected to BSA(Battery System ASS'y)_CHASSIS_GND when the auxiliary battery is not installed in a vehicle. Claim 10 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 9, the (-) terminal of the auxiliary battery is connected to the BSA_CHASSIS_GND, and when the auxiliary battery is installed in a vehicle, it is connected to the VEHICLE_CHASSIS_GND through a separate cable. Claim 11 A battery management system for managing an integrated battery system (BSA, Battery System ASS'y) including a high-voltage battery module and an auxiliary battery, comprising: a power circuit unit that receives power from the auxiliary battery and supplies it within the battery management system (BMS); and an isolated circuit structure that isolates each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cells of the auxiliary battery, thereby blocking the situation in which the different GNDs of the power circuit unit and the auxiliary battery cell monitoring unit are electrically connected within the board of the BMS when the auxiliary battery is not installed in the vehicle, and blocking the situation in which the load current of the auxiliary battery flows into the board of the BMS when the auxiliary battery is installed in the vehicle. Claim 12 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 11, the above-described isolated circuit structure is designed to isolate the portion on the board of the BMS where the power circuit and controller are mounted and the portion where the auxiliary battery cell monitoring unit is mounted, and the communication path between the controller and the auxiliary battery cell monitoring unit is implemented as an isolated communication circuit. Claim 13 A battery management system for managing an integrated battery system (BSA, Battery System ASS'y) including a high-voltage battery module and an auxiliary battery, comprising: a power circuit unit that receives power from the auxiliary battery and supplies it within the battery management system (BMS); and a non-isolated circuit structure that adjusts the potential difference between each ground (GND) of the power circuit unit and the auxiliary battery cell monitoring unit that monitors the battery cells of the auxiliary battery, thereby blocking the situation in which the different GNDs of the power circuit unit and the auxiliary battery cell monitoring unit are electrically connected within the board of the BMS when the auxiliary battery is not installed in the vehicle, and blocking the situation in which the load current of the auxiliary battery flows into the board of the BMS when the auxiliary battery is installed in the vehicle. Claim 14 A battery management system having an auxiliary battery cell monitoring function, wherein, in claim 13, the above-mentioned non-isolated circuit structure is a structure in which the GND planes of the power circuit section and the auxiliary battery cell monitoring section are connected at one point using a resistor (R).

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