Battery device and battery system including the same

Abstract

The battery device includes a battery pack including a plurality of battery cells, a battery disconnect unit (BDU) including a high-voltage operating element connected to the battery pack and monitoring a battery pack current flowing through the battery pack, and a battery pack control module (BPCM) diagnosing a state of the battery pack based on battery state information indicating a state of the battery pack and transmitting a necessary control command to the BDU based on the diagnosis result. The BDU includes a current measuring unit that measures the battery pack current based on a result of sensing the battery pack current, a high voltage measuring unit that measures a battery pack voltage of the battery pack, an insulation resistance measuring unit that measures an insulation resistance of the battery pack, and a power DC-DC unit that generates a power supply voltage required for the operation of the BDU.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the benefit of priority based on Korean Patent Application No. 10 - 2022 - 0064151, filed on May 25, 2022, and all of the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present disclosure relates to a battery device and a battery system including the same.

Background Art

[0003] Hybrid electric vehicles (HEVs), plug - in hybrid electric vehicles (PHEVs), electric vehicles driven by motors, etc. require high - voltage batteries. For the stability of high - voltage batteries, a diagnostic circuit is needed not only to monitor voltage, current, insulation resistance, temperature, etc. of a plurality of battery packs constituting the high - voltage battery but also to diagnose the presence or absence of abnormalities.

[0004] A battery management system is configured to perform monitoring, diagnosis, etc., and can manage a plurality of battery packs provided in a vehicle. As the number of battery packs constituting the high - voltage battery increases, the length of the wire harness connecting the plurality of battery packs and the battery management system becomes longer, and the circuit for performing monitoring and diagnosis for each of the plurality of battery packs becomes more complex. This causes difficulty in designing the high - voltage battery.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object is to provide a battery device with improved circuit complexity and a battery system including the same.

Means for Solving the Problems

[0006] According to one aspect of the invention, a battery device includes a battery pack including a plurality of battery cells, a high-voltage operating element connected to the battery pack, a BDU (Battery Disconnect Unit) for monitoring the current of the battery pack current flowing through the battery pack, and a BPCM (Battery Pack Control Module) for diagnosing the state of the battery pack based on battery state information indicating the state of the battery pack and transmitting a necessary control command to the BDU based on the diagnosis result. The BDU includes a current measurement unit for measuring the battery pack current based on the result of sensing the battery pack current, a high-voltage measurement unit for measuring the battery pack voltage of the battery pack, an insulation resistance measurement unit for measuring the insulation resistance of the battery pack, and a power DC-DC unit for generating a power supply voltage necessary for the operation of the BDU.

[0007] The BDU may further include a shunt type current sensor for sensing the battery pack current.

[0008] The BDU may further include a hall type current sensor for sensing the battery pack current, and the BPCM may include a current measurement unit for measuring the battery pack current based on the result sensed from the hall type current sensor.

[0009] The BDU may further include a main positive electrode contact and a main negative electrode contact connected to the positive electrode and the negative electrode of the battery pack, respectively, and a contact controller for controlling the operation of the main positive electrode contact and the main negative electrode contact.

[0010] The BDU may further include a pyro fuse for interrupting the connection between the battery pack and the load by an impact, and a pyro fuse controller for controlling the pyro fuse.

[0011] The BPCM can include a power DC-DC section that supplies power to the power DC-DC section of the BDU in an insulated form.

[0012] A battery system according to another feature of the invention can include a main battery device including a main battery pack, and a sub-battery device including a sub-battery pack connected to the main battery pack. The main battery device can include a high-voltage operating element connected to the main battery pack, a first BDU (Battery Disconnect Unit) that monitors the current of the battery pack current flowing through the main battery pack, and a BPCM (Battery Pack Control Module) that diagnoses the state of the main battery pack based on battery state information indicating the state of the main battery pack and transmits necessary control commands to the BDU based on the diagnosis result. The first BDU can include a current measurement section that measures the battery pack current based on the result of sensing the battery pack current, a first high-voltage measurement section that measures the battery pack voltage of the main battery pack, a first insulation resistance measurement section that measures the insulation resistance of the main battery pack, and a first power DC-DC section that generates a power supply voltage necessary for the operation of the BDU.

[0013] The BPCM can further include a power DC-DC section that supplies power to the first power DC-DC section in an insulated form.

[0014] The sub-battery device can include a second BDU including a high-voltage operating element connected to the sub-battery pack. The second BDU can include a second high-voltage measurement section that measures the battery pack voltage of the sub-battery pack, a second insulation resistance measurement section that measures the insulation resistance of the sub-battery pack, and a second power DC-DC section that generates a power supply voltage necessary for the operation of the BDU, and the BPCM can include a power DC-DC section that supplies power to the second power DC-DC section in an insulated form.

[0015] The first BDU may further include a main positive electrode contact and a main negative electrode contact respectively connected to the positive electrode and the negative electrode of the main battery pack, and a contact controller for controlling the operations of the main positive electrode contact and the main negative electrode contact.

[0016] Insulated power is transmitted from the BPCM to the first power DC-DC unit, and the first power DC-DC unit can supply a power supply voltage to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the contact controller with the insulated power.

[0017] Power is transmitted from the BPCM to the first power DC-DC unit, and the first power DC-DC unit may include a DC-DC converter for converting the transmitted power, and a transformer connected to the output of the DC-DC converter. A power supply voltage can be supplied from the transformer to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the contact controller.

[0018] The first BDU may further include a pyro fuse for cutting off the connection between the main battery pack and the load by impact, and a pyro fuse controller for controlling the pyro fuse. Insulated power is transmitted from the BPCM to the first power DC-DC unit, and the first power DC-DC unit can supply a power supply voltage to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the pyro fuse controller with the insulated power.

[0019] Alternatively, power is transmitted from the BPCM to the first power DC-DC unit, the first power DC-DC unit includes a DC-DC converter for converting the transmitted power, and a transformer connected to the output of the DC-DC converter, and a power supply voltage can be supplied from the transformer to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the pyro fuse controller.

Advantages of the Invention

[0020] The present invention provides a battery device with improved circuit complexity and a battery system including the same.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0022] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the attached drawings. The same or similar reference numerals are assigned to the same or similar components, and redundant descriptions thereof are omitted. The suffixes "module" and / or "section" for the components used in the following description are given or mixed only for the ease of preparing the specification, and do not have meanings or roles that distinguish them from each other. Also, when it is determined that a specific description of a related known technology in describing the embodiments disclosed in this specification may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof is omitted. Further, the attached drawings are only for facilitating the understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and it should be understood that all modifications, equivalents, or alternatives included in the spirit and technical scope of the present invention are included.

[0023] Terms including ordinal numbers such as first, second, etc. can be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

[0024] In this application, terms such as "including" or "having" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should be understood that the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

[0025] Among the configurations according to an embodiment, in the configuration that controls other configurations under specific control conditions, a program realized by a set of instruction words that embody the control algorithm necessary to control other configurations can be installed. The control configuration can process input data and stored data by the installed program to generate output data. The control configuration can include a non-volatile memory for storing the program and a memory for storing data.

[0026] FIG. 1 is a block diagram showing a battery device for explaining the present invention.

[0027] As shown in FIG. 1, the battery device 1 can include a battery pack 11, a CSC (Cell Supervisory Circuit) 12, a BDU (Battery Disconnect Unit) 13, and a BPCM (Battery Pack Control Module) 14. The battery device 1 is electrically connected to an electric vehicle (Electric Vehicle) 10 to supply power to the electric vehicle 10, and can be connected to the electric vehicle 10 through CAN communication, wireless communication, etc. to transmit and receive information related to power supply. Also, the battery device 1 can be charged through the power supplied from the electric vehicle 10, and can transmit and receive information necessary for charge control to and from the electric vehicle 10.

[0028] In FIG. 1, the battery pack 11 is shown as including three battery modules each composed of four battery cells, but the invention is not limited thereto. The three battery modules 111 are connected in series, and the battery module 111 can include four battery cells 112 connected in series.

[0029] CSC12 can monitor the cell voltages of a plurality of battery cells constituting the battery pack 11 and the temperatures of the plurality of battery cells, and perform cell balancing. CSC12 can transmit the information acquired by CSC12 to BPCM14 through communication with BPCM14, and receive control commands regarding monitoring and cell balancing from BPCM14. CSC12 may be connected to both ends of each of the plurality of battery cells 112.

[0030] BDU13 includes high-voltage operating elements connected to the battery pack 11, and can monitor the current of the battery pack current flowing through the battery pack 11. For example, BDU13 can include a Hall type current sensor 131, a shunt type current sensor 132, a pre-charge contact 133, a main positive / negative contact 134, a direct current fast charging (DCFC) contact 135, a breaktor 136, a fuse 137, and a pyro fuse 138. The pre-charge contact 133, the main positive / negative contact 134, the direct current fast charging (DCFC) contact 135, the breaktor 136, the fuse 137, and the pyro fuse 138 may be high-voltage operating elements that are directly connected to the positive or negative electrode of the battery pack 11, a battery module constituting the battery pack 11, etc., and a high voltage can be applied across their two ends.

[0031] Each of the two current sensors 131, 132 can sense the battery pack current flowing through the battery pack 11 and generate a sensing signal. The Hall type current sensor 131 measures the battery pack current using a Hall sensor electromagnetically coupled to the wiring through which the battery pack current flows, and the shunt type current sensor 132 can measure the battery pack current using a shunt resistor located on the path through which the battery pack current flows.

[0032] The pre-charge contactor 133 is connected between the positive electrode of the battery pack 11 and the positive electrode output terminal of the battery device 1, and the main positive / negative contactor 134 can include a main positive contactor connected between the positive electrode of the battery pack 11 and the positive electrode output terminal and a main negative contactor connected between the negative electrode of the battery pack 11 and the negative electrode output terminal.

[0033] The DC fast charging contactor 135 can be connected to an external charger to fast charge the battery pack 11.

[0034] The breaker 136 is a protection circuit for protecting the battery device 1 from overcurrent and overvoltage.

[0035] The fuse 137 can protect the battery pack 11 from overcurrent, and the pyro fuse 138 can cut off the connection between the battery pack 11 and the load by impact. The load may be the electric vehicle 10 shown in FIG. 1.

[0036] Each component of the BDU 13 can be realized by known technologies, and detailed descriptions thereof are omitted in this specification.

[0037] The BPCM 14 can generate control commands required for the CSC 12 and the BDU 13 based on the information received from the CSC 12 and the BDU 13 and transmit them to the CSC 12 and the BDU 13. The BPCM 14 can diagnose the states of the battery cells and the battery pack 11 based on state information indicating the states of the battery cells and the battery pack 11, such as the cell voltage, temperature, voltage, current, and temperature of the battery pack 11, and transmit necessary control commands to the CSC 12 and the BDU 13 based on the diagnosis results. The BPCM 14 can receive information required for the management of the battery pack 11 through communication with the electric vehicle 10 and transmit necessary control commands to the CSC 12 and the BDU 13 based on the received information.

[0038] BPCM14 can include an MCU (Main Control Unit) 141, an SBC (System Basis Chip) 142, a power DC-DC unit 143, a contact controller 144, a pyro fuse controller 145, a current measurement unit 146, a high voltage measurement unit 147, and an insulation resistance measurement unit 148. In addition to the configuration shown in FIG. 1, various configurations such as a communication bridge IC, a temperature measurement unit, an EEPROM, and a CAN communication unit may be provided in BPCM14.

[0039] The MCU 141 can analyze the battery state information with respect to the battery pack 11 to determine the state of the battery pack 11, and control the necessary management operations according to the determined state. For example, when there are battery cells in the battery pack 11 that require cell balancing, the MCU 141 can control the CSC 12 to perform cell balancing. The MCU 141 can integrate the battery pack current to estimate the SOC of the battery pack 11, and control charging and discharging based on the estimated SOC. The SOH of the battery pack 11 can be estimated based on the internal resistance of the battery pack 11. The MCU 141 can determine whether a protection operation for the battery pack 11 is necessary based on the battery state information, and if a protection operation is necessary, the protection operation can be activated.

[0040] The SBC 142 can manage the power supply within the battery device 1 under the control of the MCU 141. The SBC 142 can generate different levels of power supplies to provide a multi-output power supply, can be realized by an integrated circuit, can transmit and receive necessary information with other components through CAN or LIN communication, and can provide a stable function for the battery device 1. The SBC 142 can receive control commands through SPI communication with the MCU 141.

[0041] The power DC-DC unit 143 can convert the voltage of the power supply supplied from the SBC 142 and generate the voltage required for the operation of the BPCM 14. The voltage generated by the power DC-DC unit 143 can be supplied to the configuration of the BPCM 14. For example, the contact controller 144 can generate a control signal for controlling the opening and closing of the pre-charge contactor 133 and the main positive / negative contactor 134 of the BDU 13 using the voltage supplied from the power DC-DC unit 143.

[0042] The contact controller 144 can generate a control signal for controlling the pre-charge contactor 133 and the main positive / negative contactor 134 of the BDU 13 under the control of the MCU 141 and transmit it to the pre-charge contactor 133 and the main positive / negative contactor 134. The contact controller 144 can receive the power supply voltage required for generating the control signal from the power DC-DC unit 143.

[0043] Pilot fuse controller 145 can generate a control signal for controlling the pilot fuse 139 under the control of the MCU 141 and transmit it to the pilot fuse 139. Pyro fuse controller 145 can receive the power supply voltage required for generating the control signal from the power DC-DC unit 143.

[0044] The current measurement unit 146 can receive the sensed signals measured from the two current sensors 131 and 132 of the BDU 13 and measure the battery pack current flowing through the battery pack 11. The current measurement unit 146 can transmit the information indicating the measured battery pack current to the MCU 141.

[0045] The high-voltage measurement unit 147 is connected to the battery pack 11 through the high-voltage cable 15, and can measure the battery pack voltage of the battery pack 11. Also, the high-voltage measurement unit 147 can measure the voltages at both ends of the main positive / negative contacts 135, the voltages at both ends of the pyro fuse 139, the voltages at both ends of the fuse 137, etc., of the nodes having high voltage through the high-voltage cable 15. The high voltage measured by the high-voltage measurement unit 147 is transmitted to the MCU 141, and the MCU 141 can perform a diagnosis on the stuck close / open of the main positive / negative contacts 135, the fuse 137, the pyro fuse 139, etc., based on the measured high voltage.

[0046] The insulation resistance measurement unit 148 can measure the insulation resistance of the battery pack 11. The insulation resistance measurement unit 148 can be connected to the battery pack 11 through the high-voltage cable 15 to measure the insulation resistance. The insulation resistance measurement unit 148 can transmit the measured insulation resistance value to the MCU 141. The MCU 141 can determine whether there is a leakage problem in the battery pack 11 based on the received insulation resistance value. For example, the MCU 141 can determine that there is a problem with insulation and a leakage current flows if the measured insulation resistance is less than a predetermined threshold value.

[0047] One end of the high-voltage cable 15 may be connected to a plurality of nodes for measuring voltages, such as the positive and negative electrodes of the battery pack 11, the positive and negative electrodes of each of the plurality of battery modules 111 constituting the battery pack 11, both ends of the fuse 137, both ends of the pyro fuse 139, and both ends of the main positive / negative contacts 135 respectively. The other end of the high-voltage cable 15 may be connected to a configuration for measuring high voltage, such as the high-voltage measurement unit 147, the insulation resistance measurement unit 148, etc.

[0048] Since the high-voltage cable 15 is connected within the battery pack 11 and the BDU 13 and extended to the BPCM 14, the length of the high-voltage cable 15 becomes long and the design complexity of the battery device 1 increases. That is, since the nodes that must be measured through the high-voltage cable 15 enter the BPCM 14 and must be connected to the BPCM 14, the length of the high-voltage cable 15 increases as the distance between the BPCM 14 and the nodes increases. Such design complexity may also increase the safety risk due to high voltage.

[0049] FIG. 2 is a diagram showing a battery device according to an embodiment.

[0050] In the battery device 2 shown in FIG. 2, the same components as those of the battery device 1 shown in FIG. 1 are denoted by the same reference numerals as those described in the drawing of FIG. 1. As shown in FIG. 2, the battery device 2 includes a battery pack 11, a CSC 12, a BDU 23, and a BPCM 24, and the BDU 23 includes a high-voltage monitoring IC 230 and a power DC-DC unit 235. Although not shown in FIG. 2, the BDU 23 may further include a hall-type current sensor 131, a pre-charge contactor 133, a main positive / negative contactor 134, a direct current fast charging (DCFC) contactor 135, a breaktor 136, a fuse 137, and a pyrofuse 138, which are the same as those of the BDU 13 in FIG. 1.

[0051] The high-voltage monitoring IC 230 includes a shunt-type current sensor 231, a current measurement unit 232, a high-voltage measurement unit 233, and an insulation resistance measurement unit 234. The shunt-type current sensor 231, the high-voltage measurement unit 233, and the insulation resistance measurement unit 234 of the BDU 23 may have the same functions as those of the shunt-type current sensor 131, the high-voltage measurement unit 147, and the insulation resistance measurement unit 148 of the battery device 1. In this way, the components related to high voltage can be combined and realized as the HV monitoring IC 233.

[0052] The current measurement unit 232 can measure the battery pack current based on the signal received from the shunt type current sensor 231. The current measurement unit 232 can transmit information regarding the measured battery pack current to the BPCM 24 through CAN communication.

[0053] The high voltage measurement unit 233 is connected to the battery pack 11 and can measure the battery pack voltage of the battery pack 11. Further, the high voltage measurement unit 233 can measure the voltage of nodes having a high voltage, such as the voltage across both ends of each of the main positive / negative contacts 135, the voltage across both ends of the pyro fuse 139, and the voltage across both ends of the fuse 137. The high voltage measured by the high voltage measurement unit 233 is transmitted to the MCU 141, and the MCU 141 can perform a diagnosis on stuck close / open of the main positive / negative contacts 135, the fuse 137, the pyro fuse 139, etc. based on the measured high voltage.

[0054] The insulation resistance measurement unit 234 can measure the insulation resistance of the battery pack 11 and determine whether there is a leakage problem in the battery pack 11. The insulation resistance measurement unit 234 can be connected to the battery pack 11 to measure the insulation resistance.

[0055] The power DC-DC unit 235 can generate the power supply voltage required for the operation of the BDU 23. The power DC-DC unit 235 can receive the supply of the voltage generated by the power DC-DC unit 143 of the BPCM 24 and generate the voltage required for the BDU 23.

[0056] In this way, by positioning the related components that receive and process the high voltage input within the BDU 23, the high voltage cable does not need to be extended to the BPCM 24. As a result, the design complexity of the battery device 2 can be reduced compared to FIG. 1.

[0057] FIG. 3 is a diagram showing a battery device according to an embodiment.

[0058] In the battery device 3 shown in FIG. 3, the same components as those of the battery devices 1 and 2 shown in FIGS. 1 and 2 are denoted by the same reference numerals as those described in FIGS. 1 and 2. As shown in FIG. 3, the battery device 3 includes a CSC 12, a BDU 33, and a BPCM 34. Different from the BDU 23, the BDU 33 does not include a hall-type current sensor 131. Accordingly, since the BPCM 34 does not receive information regarding the battery pack current, a current measurement unit 146 is not included either.

[0059] Different from the battery device 1 that uses two types of current sensors 131 and 132, the battery device 3 includes only one shunt-type current sensor 231. This reduces the production cost of the battery device and enables space to be secured within the battery device.

[0060] FIG. 4 is a diagram showing a battery device according to an embodiment.

[0061] In the battery device 4 shown in FIG. 4, the same components as those of the battery devices 1, 2, and 3 shown in FIGS. 1 to 3 are denoted by the same reference numerals as those described in FIGS. 1 to 3. As shown in FIG. 4, the battery device 4 includes a CSC 12, a BDU 43, and a BPCM 44. The BDU 43 includes a high-voltage monitoring IC 430, a power DC-DC unit 435, a contact controller 436, and a pyro fuse controller 437. The BDU 43 may further include a pre-charge contact 133, a main positive / negative contact 134, a direct current fast charging (DCFC) contact 135, a breaktor 136, a fuse 137, and a pyro fuse 138, the same as the BDU 13 in FIG. 1.

[0062] The high-voltage monitoring IC 430 can include both a Hall-type and a shunt-type current sensor 431. Since the high-voltage monitoring IC 430 has a configuration related to high voltage and current integrated therein, it is also possible to implement both types of current sensors. However, the invention is not limited thereto, and the high-voltage monitoring IC 430 can include only one type of current sensor.

[0063] The current measurement unit 432 can measure the battery pack current based on the signals received from the Hall-type and shunt-type current sensors 431. The current measurement unit 432 can transmit information regarding the measured battery pack current to the BPCM 44 through CAN communication.

[0064] The power DC-DC unit 435 can convert the power supplied from outside the BDU 43 to generate the power supply voltage of the BDU 43. For example, the power DC-DC unit 435 can convert the power supplied from the battery pack 11 to generate the power supply voltage required for the BDU 43.

[0065] The contact controller 436 operates with the voltage supplied from the power DC-DC unit 435, and can obtain the information necessary to control the operations of the contacts 133, 134, 135 and the breaker 136 by transmitting and receiving information with the high-voltage monitoring IC 430 through SPI communication. The contact control unit 436 can control the operations of the contacts 133, 134, 135 and the breaker 136 based on the control commands from the MCU 141 and the information received from the high-voltage monitoring IC 430.

[0066] The pyro fuse controller 437 operates with the voltage supplied from the power DC-DC unit 435, and can acquire the information necessary for controlling the pyro fuse 138 by transmitting and receiving information to and from the high-voltage monitoring IC 430 through SPI communication. The pyro fuse controller 437 can control the pyro fuse 138 based on the information received from the high-voltage monitoring IC 430. If necessary, the pyro fuse controller 437 can receive a control command from the MCU 141 and can consider the control command from the MCU 141 in controlling the pyro fuse 138.

[0067] The BPCM 44 does not include a power DC-DC unit as compared with the embodiment shown in FIG. 3. Since the BDU 43 includes the power DC-DC unit 435 that provides the voltage necessary for operation, the BPCM 44 may not include a power DC-DC unit for supplying power externally.

[0068] FIG. 5 is a diagram showing a battery device according to an embodiment.

[0069] The difference between the battery device 5 shown in FIG. 5 and the battery device 4 shown in FIG. 4 lies only in the power generation configuration. For example, the BDU 43 of the battery device 4 receives power supply from the battery pack 11 to generate the power supply voltage of the BDU 43, and the BDU 53 of the battery device 5 receives power supply from the power DC-DC unit 143 of the BPCM 54. The BDU 53 includes a power DC-DC unit 535, and the power DC-DC unit 535 can convert the power supplied from the power DC-DC unit 143 of the BPCM 54 to generate the power supply voltage of the BDU 53.

[0070] Similar to the BDU13 in FIG. 1, the BDU53 can further include a pre-charge contactor 133, a main positive / negative contactor 134, a direct current fast charging (DCFC) contactor 135, a breaktor 136, a fuse 137, and a pyro fuse 138. The configurations 531-534 of the high-voltage monitoring IC 530, the contact control unit 536, and the pyro fuse control unit 537 of the BDU53 are the same as those of the high-voltage monitoring IC 430, the contact control unit 436, and the pyro fuse control unit 437 of the BDU43.

[0071] In the above embodiments, the battery device has been described as including one battery pack, but the invention is not limited thereto. In the following embodiments, the battery device will be described as including a plurality of battery packs. Descriptions of the same configurations as those in the foregoing embodiments will be omitted.

[0072] FIG. 6 is a diagram showing a battery system according to an embodiment.

[0073] In FIG. 6, the battery system 6 is shown as including three battery devices 100, 200, and 300. The number of battery packs is not limited to that shown in FIG. 6.

[0074] The main battery device 100, which is one of the three battery devices 100, 200, and 300, can be realized by one of the battery devices 2-5 shown in FIGS. 2 to 5. The main battery pack 100 shown in FIG. 6 may have similar components and operations as the battery device 3 shown in FIG. 3.

[0075] The main battery device 100 includes a battery pack 110, a CSC 120, a BDU 130, and a BPCM 140. Descriptions overlapping with those of the battery pack 11, the CSC 12, the BDU 33, and the BPCM 34 of the battery device 3 shown in FIG. 3 will be omitted.

[0076] The BDU130 can include a high-voltage monitoring IC610, a power DC-DC section 615, a pre-charge contactor 133, a main positive / negative contactor 134, a direct current fast charging (DCFC) contactor 135, a breaktor 136, a fuse 137, and a pyro fuse 138. The high-voltage monitoring IC610 can include a shunt-type current sensor 611, a current measurement section 612, a high-voltage measurement section 613, and an insulation resistance measurement section 614.

[0077] The high-voltage measurement section 613 is connected to the battery pack 110 and can measure the battery pack voltage of the battery pack 110. Also, the high-voltage measurement section 613 can measure the voltage of nodes having a high voltage, such as the voltage across both ends of each of the main positive / negative contactors 134, the voltage across both ends of the DCFC contactor 135, the voltage across both ends of the pyro fuse 138, and the voltage across both ends of the fuse 137. The high voltage measured by the high-voltage measurement section 613 is transmitted to the MCU141, and the MCU141 can perform a diagnosis of stuck close / open for the main positive / negative contactor 134, the DCFC contactor 135, the fuse 137, the pyro fuse 138, etc. based on the measured high voltage.

[0078] The contactor controller 144 of the BPCM140 can generate a control signal for controlling the operations of the pre-charge contactor 133, the main positive / negative contactor 134, the DCFC contactor 135, the breaktor 136, etc. of the sub-battery device 200 and transmit it to the BDU130. The pyro fuse controller 145 of the BPCM140 can generate a control signal for controlling the operation of the pyro fuse 138 and transmit it to the BDU130.

[0079] The insulation resistance measurement unit 614 can measure the insulation resistance of the battery pack 110 to determine whether there is a leakage problem in the battery pack 110. The insulation resistance measurement unit 614 can be connected to the battery pack 110 to measure the insulation resistance.

[0080] The power DC-DC unit 615 can generate the voltage required for the operation of the BDU 130. The power DC-DC unit 615 can receive the supply of the voltage generated by the power DC-DC unit 143 of the BPCM 140 and generate the voltage required for the BDU 130.

[0081] The BDU 130 of the main battery pack 100 can transmit information about the battery pack current to the MCUs 141 of the sub-battery devices 200, 300 and the BPCM 140 through UART communication. Alternatively, the BDU 130 can transmit information about the battery pack current to the MCU 141 through UART communication, and the MCU 141 can transmit information about the battery pack current to the sub-battery devices 200, 300. Since the plurality of battery devices 100, 200, 300 are connected in series, the same battery pack current will flow. In the BDU 130 of the main battery device 100, the current measurement unit 612 can measure the battery pack current using the signal received from the shunt type current sensor 611. The BDU 130 can transmit the current measured by the current measurement unit 612 to the BDU 220 and / or the MCU 141 of each of the sub-battery devices 200, 300 through UART communication. In this way, the sub-battery devices 200, 300 do not need to be configured with current sensors and current measurement units.

[0082] BPCM 140 can include an MCU 141, an SBC 142, a power DC-DC unit 143, a contactor controller 144, and a pyro fuse controller 145. The MCU 141 can receive state information regarding the battery packs 110, 210, 310 from the plurality of battery devices 100, 200, 300 respectively, and generate control commands for controlling the operations of the respective battery devices 100, 200, 300 based on the state information. The control commands can include cell balancing control, charge and discharge control of the battery pack, overvoltage protection operation control, overcurrent protection operation control, etc. for each of the battery devices 100, 200, 300.

[0083] The power DC-DC unit 143 supplies power to the BDU 130, 630 of each of the plurality of battery devices 100, 200, 300, the contactor controller 144 transmits a contactor control signal to the BDU 130 of the battery device 100, and the pyro fuse controller 145 can transmit a pyro fuse control signal to the BDU 130 of the battery device 100.

[0084] The sub-battery pack 200 can include a battery pack 610, a CSC 620, and a BDU 630. The description of the configuration identical to that of the battery device 1 shown in FIG. 1 is omitted.

[0085] The BDU 630 can include a high-voltage monitoring IC 640, a power DC-DC unit 643, a pre-charge contactor 644, a main positive / negative contactor 645, a direct current fast charging (DCFC) contactor 646, a breaktor 647, a fuse 648, and a pyro fuse 649. The high-voltage monitoring IC 640 can include a high-voltage measurement unit 641 and an insulation resistance measurement unit 642.

[0086] The high-voltage measurement unit 641 is connected to the battery pack 610 and can measure the battery pack voltage of the battery pack 610. Further, the high-voltage measurement unit 641 can measure the voltages of nodes with high voltages such as the voltages across both ends of the main positive / negative contacts 645, the voltage across both ends of the DCFC contact 646, the voltage across both ends of the pyro fuse 649, and the voltage across both ends of the fuse 648. The high voltage measured by the high-voltage measurement unit 641 is transmitted to the MCU 141, and the MCU 141 can perform a diagnosis on the stuck close / open of the main positive / negative contact 636, the DCFC contact 646, the fuse 648, the pyro fuse 649, etc. based on the measured high voltage.

[0087] The contact controller 144 of the BPCM 140 can generate control signals for controlling the operations of the pre-charge contact 644, the main positive / negative contacts 645, the DCFC contact 646, the breaktor 647, etc. of the sub-battery device 200 and transmit them to the sub-battery device 200. The pyro fuse controller 145 of the BPCM 140 can generate a control signal for controlling the operation of the pyro fuse 649 and transmit it to the sub-battery device 200.

[0088] The insulation resistance measurement unit 642 can measure the insulation resistance of the battery pack 610 and determine whether there is a leakage problem in the battery pack 610. The insulation resistance measurement unit 642 can be connected to the battery pack 610 to measure the insulation resistance.

[0089] The power DC-DC unit 643 can generate the voltage required for the operation of the BDU 630. The power DC-DC unit 643 can receive the supply of the voltage generated by the power DC-DC unit 143 of the BPCM 140 and generate the voltage required for the BDU 630.

[0090] In FIG. 6, the BDU 630 of the sub-battery device 200 is shown to include a pre-charge contact 644, a main positive / negative contact 645, a DCFC contact 646, a breaktor 647, and a pyro fuse 649, but the invention is not limited thereto. For example, the BDU 630 may include only the contacts and fuses 648 that connect the adjacent battery pack (e.g., 110) and the battery pack 610. In this case, the BDU 630 can control the contacts using only the control signal for one of the contacts among the control signals received from the pyro fuse controller 145 and the contact controller 144.

[0091] Since the configuration of the sub-battery device 300 is the same as that of the sub-battery device 200, a detailed description thereof will be omitted.

[0092] FIG. 7 is a diagram showing a battery system according to an embodiment.

[0093] In FIG. 7, the battery system 7 is shown to include three battery devices 400, 500, and 600. The number of battery packs is not limited to that shown in FIG. 7.

[0094] The main battery device 400, which is one of the three battery devices 400, 500, and 600, can be realized by one of the battery devices 2-5 shown in FIGS. 2 to 5. The main battery pack 400 shown in FIG. 7 may be similar in components and operations compared to the battery device 5 shown in FIG. 5.

[0095] The main battery device 400 includes a battery pack 410, a CSC 420, a BDU 430, and a BPCM 440. Descriptions overlapping with those of the battery pack 11, the CSC 12, the BDU 53, and the BPCM 54 of the battery device 5 shown in FIG. 5 will be omitted.

[0096] The BDU430 can include a high-voltage monitoring IC 710, a power DC-DC section 715, a contact controller 716, a pyro fuse controller 717, a pre-charge contact 133, a main positive / negative contact 134, a direct current fast charging (DCFC) contact 135, a breaktor 136, a fuse 137, and a pyro fuse 138. The high-voltage monitoring IC 710 can include shunt-type and hall-type current sensors 711, a current measurement section 712, a high-voltage measurement section 713, and an insulation resistance measurement section 714.

[0097] The high-voltage measurement section 713 is connected to the battery pack 410 to measure the battery pack voltage of the battery pack 410. Also, the high-voltage measurement section 713 can measure the voltage of nodes with high voltage, such as the voltage across both ends of each of the main positive / negative contacts 134, the voltage across both ends of the DCFC contact 136, the voltage across both ends of the pyro fuse 138, and the voltage across both ends of the fuse 137. The high voltage measured by the high-voltage measurement section 713 is transmitted to the MCU 141, and the MCU 141 can perform a diagnosis on stuck close / open of the main positive / negative contact 134, the DCFC contact 135, the fuse 137, the pyro fuse 138, etc. based on the measured high voltage.

[0098] The insulation resistance measurement section 714 can measure the insulation resistance of the battery pack 410 to determine whether there is a leakage problem in the battery pack 410. The insulation resistance measurement section 714 can be connected to the battery pack 410 to measure the insulation resistance.

[0099] The power DC-DC section 715 can generate the voltage required for the operation of the BDU430. The power DC-DC section 715 can receive the supply of the voltage generated by the power DC-DC section 143 of the BPCM 140 and generate the voltage required for the BDU 730.

[0100] The BDU 430 of the main battery pack 400 can transmit information regarding the battery pack current to the MCUs 141 of the sub-battery devices 500, 600, and the BPCM 440 through UART communication. Alternatively, the BDU 430 can transmit information regarding the battery pack current to the MCU 141 through UART communication, and the MCU 141 can transmit information regarding the battery pack current to the sub-battery devices 500, 600. Since the multiple battery devices 400, 500, 600 are connected in series, the same battery pack current will flow. In the BDU 430 of the main battery device 400, the current measurement unit 712 can measure the battery pack current using the signals received from the shunt type and hall type current sensors 611. The BDU 430 can transmit the current measured by the current measurement unit 712 to the BDU 520 and / or the MCU 141 of each of the sub-battery devices 500, 600 through UART communication. In this way, the sub-battery devices 500, 600 do not need to be configured with current sensors and current measurement units.

[0101] The BPCM 440 can include the MCU 141, the SBC 142, and the power DC-DC unit 143. The MCU 141 can receive state information regarding the battery packs 410, 510 from each of the multiple battery devices 400, 500, 600, and can generate control commands for controlling the operations of each of the battery devices 400, 500, 600 based on the state information. The control commands can include cell balancing control, charge and discharge control of the battery pack, overvoltage protection operation control, overcurrent protection operation control, etc. of each of the battery devices 400, 500, 600. The power DC-DC unit 143 can supply power to the BDU 430, 530 of each of the multiple battery devices 400, 500, 600.

[0102] The contact controller 716 operates with the voltage supplied from the power DC-DC unit 715, and can acquire the information necessary for controlling the operations of the contacts 133, 134, 135 and the breaker 136 by transmitting and receiving information to and from the high-voltage monitoring IC 710 through SPI communication. The contact control unit 716 can control the operations of the contacts 133, 134, 135 and the breaker 136 based on the control commands from the MCU 141 and the information received from the high-voltage monitoring IC 710.

[0103] The pyro fuse controller 717 operates with the voltage supplied from the power DC-DC unit 715, and can acquire the information necessary for controlling the pyro fuse 138 by transmitting and receiving information to and from the high-voltage monitoring IC 710 through SPI communication. The pyro fuse controller 717 can control the pyro fuse 138 based on the information received from the high-voltage monitoring IC 710. If necessary, the pyro fuse controller 717 can receive a control command from the MCU 141 and consider the control command from the MCU 141 in controlling the pyro fuse 138.

[0104] The sub-battery pack 500 can include a battery pack 510, a CSC 520, and a BDU 530. The description of the configuration identical to that of the battery device 1 shown in FIG. 1 will be omitted.

[0105] The BDU 530 can include a high-voltage monitoring IC 540, a power DC-DC unit 543, a contact controller 544, a pyro fuse controller 545, a pre-charge contact 546, a main positive / negative contact 547, a DCFC contact 548, a breaker 549, a fuse 550, and a pyro fuse 551. The high-voltage monitoring IC 540 can include a high-voltage measurement unit 541 and an insulation resistance measurement unit 542.

[0106] The high-voltage monitoring IC 540 can include a high-voltage measurement unit 541 and an insulation resistance measurement unit 542.

[0107] The high-voltage measurement unit 541 is connected to the battery pack 510 and can measure the battery pack voltage of the battery pack 510. Also, the high-voltage measurement unit 541 can measure the voltages of nodes with high voltages, such as the voltages across both ends of each of the main positive / negative contacts 547, the voltage across both ends of the DCFC contact 548, the voltage across both ends of the pyro fuse 551, and the voltage across both ends of the fuse 550. The high voltage measured by the high-voltage measurement unit 541 is transmitted to the MCU 141, and the MCU 141 can perform a diagnosis on the stuck close / open of the main positive / negative contacts 547, the DCFC contact 548, the fuse 550, the pyro fuse 551, etc. based on the measured high voltage.

[0108] The insulation resistance measurement unit 542 can measure the insulation resistance of the battery pack 510 to determine whether there is a leakage problem in the battery pack 510. The insulation resistance measurement unit 542 can be connected to the battery pack 510 to measure the insulation resistance.

[0109] The power DC-DC unit 543 can convert the power supplied from the power DC-DC unit 143 to generate the power supply voltage of the BDU 530.

[0110] The contact controller 544 operates with the voltage supplied from the power DC-DC unit 543 and can transmit and receive information with the high-voltage monitoring IC 540 through SPI communication to obtain the information necessary to control the operations of the contacts 546, 547, 548, and the breaker 549. The contact control unit 544 can control the operations of the contacts 546, 547, 548, and the breaker 549 based on the control command from the MCU 141 and the information received from the high-voltage monitoring IC 540.

[0111] The pyro fuse controller 545 operates with the voltage supplied from the power DC-DC unit 543, and can acquire the information necessary for controlling the pyro fuse 551 by transmitting and receiving information to and from the high-voltage monitoring IC 540 through SPI communication. The pyro fuse controller 545 can control the pyro fuse 551 based on the information received from the high-voltage monitoring IC 540. If necessary, the pyro fuse controller 545 can receive a control command from the MCU 141 and can consider the control command from the MCU 141 in controlling the pyro fuse 551.

[0112] Since the configuration of the sub-battery pack 600 is the same as that of the sub-battery pack 500, a detailed description thereof will be omitted.

[0113] Hereinafter, power transmission in a battery system including a plurality of battery devices according to an embodiment will be described with reference to FIGS. 8 to 10.

[0114] FIG. 8 is a block diagram showing power transmission between the BPCM and the BDU according to an embodiment.

[0115] In FIG. 8, the configurations related to power transmission are mainly shown. As shown in FIG. 8, the main battery device includes a BPCM 81 and a BDU 82, and two sub-battery devices 83 and 84 receive power supply from the BPCM 81. The voltage of the auxiliary power supply (for example, 12V) is supplied from the electric vehicle 10 to the BPCM 81. The electric vehicle 10 can be provided with an auxiliary power supply for supplying power to electrical equipment. Although FIG. 8 shows that the voltage is supplied from this auxiliary power supply to the BPCM 81, the invention is not limited thereto. The BPCM 81 can receive a voltage supply from the battery pack.

[0116] The SBC811 of BPCM81 converts the voltage of the auxiliary power supply and supplies it to the DC-DC converter 812. For example, the SBC811 can change the voltage of the auxiliary power supply from 12V to 6.5V and supply it to the DC-DC converter 812. The DC-DC converter 812 can be implemented in a flyback type. The DC-DC converter 812 converts the input voltage to generate an output voltage, and the output voltage can be transmitted to the BDU82 through the transformer 814. Since the primary side 813 and the secondary side 821 of the transformer 814 are insulated, insulated power can be supplied from the BPCM81 to the BDU82. The primary side 813 of the transformer is provided with a primary coil that constitutes the transformer.

[0117] The BDU82 includes the secondary side 821 of the transformer, and the secondary side 821 of the transformer is provided with a secondary coil that constitutes the transformer. The output voltage of the DC-DC converter 812 insulated and transmitted to the secondary side 821 can be supplied to the high-voltage monitoring IC823, the pyro fuse controller 825, and the contact controller 826.

[0118] The power circuit 822 can convert the output voltage of the secondary side 821 and supply it to the controller 824. For example, the output voltage of the secondary side 821 is 12V, and the power circuit 822 can convert the 12V voltage to a 5V voltage suitable for the controller 824 and supply it to the controller 824. The controller 824 may be a control circuit that controls the operation of the high-voltage monitoring IC823. In the foregoing embodiment, the power DC-DC section included in the BDU can include the secondary side 821 and the power circuit 822 shown in FIG. 8.

[0119] The high-voltage monitoring IC 823, the pyro fuse controller 825, and the contact controller 826 can be driven by the output voltage of the secondary side 821. Signals can be transmitted and received between the high-voltage monitoring IC 823 and the pyro fuse controller 825, and between the high-voltage monitoring IC 823 and the contact controller 826 through SPI communication or a GPIO port (or OC port). The pyro fuse controller 825 can control the operation of turning off the pyro fuse 827. The contact controller 826 can control the operations of a precharge contactor, a main positive / negative contactor, a DCFC contactor, etc. The contact 828 shown in FIG. 8 is a block that indicates a plurality of contacts, and a plurality of contact control signals can be transmitted in parallel from the contact controller 826 to the plurality of contacts. At the same time, the voltage or current generated in each of the plurality of contacts can be transmitted to the contact controller 826. The contact controller 826 can sense the voltage, current, etc. transmitted from the contact 828 to sense a short circuit, overcurrent, high-temperature state.

[0120] When the high-voltage monitoring IC 823 senses an overcurrent, it can transmit a control command to the pyro fuse controller 825 to turn off the pyro fuse 827. Also, when the contact 828 is maintained in a closed state without being opened, the turning off of the pyro fuse 827 can prevent a fire or a short circuit. Also, when an impact sensing signal is transmitted from the electric vehicle 10 to the BPCM 81, the BPCM 81 can transmit a control command to the pyro fuse controller 825 through the high-voltage monitoring IC 823 to turn off the pyro fuse 827. At this time, the signal transmission and reception between the BPCM 81 and the BDU 82 can be realized by UART communication.

[0121] The high-voltage monitoring IC 823 can transmit a control command for controlling the opening and closing of the contactor 828 to the contactor controller 826 through SPI communication. Alternatively, using the GPIO port, the high-voltage monitoring IC 823 can transmit a signal for controlling the opening or closing of the contactor 828 to the contactor controller 826. The contactor controller 826 can sense the current flowing through the contactor 828 and transmit information indicating the sensed current to the high-voltage monitoring IC 823 through the GPIO port. The contactor controller 826 can sense that an overcurrent is flowing through the contactor 828 or that a high temperature has occurred and notify the high-voltage monitoring IC 823 of this through the GPIO port.

[0122] The sub-battery devices 83 and 84 can also receive an insulated power supply from the BPCM 81 and operate in the same manner as the BDU 82.

[0123] FIG. 9 is a diagram showing a partial configuration of a battery system according to an embodiment.

[0124] As shown in FIG. 9, a plurality of battery packs 910, 920, and 930 are connected in series. A main positive contactor 940 is connected between the positive electrode of the main battery pack 910 and the output terminal (P+) of the battery system 9, and a main negative contactor 950 is connected between the negative electrode of the sub-battery pack 930 and the output terminal (P-) of the battery system 9. The main battery pack 910 exemplarily includes four battery modules 911-914, and the pyro fuse 915 is connected between the battery module 912 and the battery module 913. Exemplarily, the battery module 912 can include a plurality of battery cells in units of two parallel-connected battery cells 916. The sub-battery packs 920 and 930 can also have the same structure as the main battery pack 910. Contactors may be connected between the main battery pack 910 and the sub-battery pack 920, and between the sub-battery pack 920 and the sub-battery pack 930.

[0125] The main positive electrode contact 940 can include a switching part 941 and a coil 942 that drives the switching part 941. The main negative electrode contact 950 can include a switching part 951 and a coil 952 that drives the switching part 951. When current flows through the coils 942 and 952 due to a signal supplied from the contact controller 826, the switching parts 941 and 951 of the main positive / negative electrode contacts 940 and 950 can operate. Also, the voltage across or the current flowing through both ends of each of the main positive / negative electrode contacts 940 and 950 can be transmitted to the contact controller 826.

[0126] FIG. 10 is a block diagram showing power transmission between the BPCM and the BDU according to an embodiment.

[0127] In one embodiment shown in FIG. 10, there is no insulation between the BPCM 91 and the BDU 92, and a transformer 922 is located within the BDU 92. The output voltage of the DC-DC converter 921 is converted by the transformer 922 and supplied as a power supply voltage to other components of the BDU 92. In the above-described embodiment, the power DC-DC section of the BDU can include a DC-DC converter 921, a transformer 922, and a power circuit 923. The DC-DC converter 921 converts the power supplied from the BPCM 91 to generate an output voltage, and the output voltage of the DC-DC converter 921 is input to the transformer 922. The transformer 922 includes a primary side connected to the output end of the DC-DC converter 921 and a secondary side connected to each component of the BDU 92, and transmits the voltage supplied to the primary side to the secondary side. That is, the transformer 922 can supply the output of the DC-DC converter 921 as a power supply voltage for each component of the BDU 92.

[0128] The power circuit 923, high-voltage monitoring IC 924, controller 925, pyro fuse controller 926, contactor controller 927, pyro fuse 928, and contactor 929 are the same as the power circuit 822, high-voltage monitoring IC 823, controller 825, pyro fuse controller 825, contactor controller 826, pyro fuse 827, and contactor 828 in the description with reference to FIG. 8 above, and thus the description thereof is omitted.

[0129] The sub-battery devices 93 and 94 also have the same internal DC-DC converters and transformers as the BDU 92 and can convert the voltage supplied from the BPCM 81 to generate a power supply voltage.

[0130] If all low-voltage / high-voltage functions are processed by a single BPCM (Battery Pack Control Module) within a battery pack, constraints such as an increase in battery pack complexity will occur. The present invention can improve the complexity of the BPCM by providing high-voltage related functions in the BDU.

[0131] Although the embodiments of the present invention have been described in detail above, the scope of the rights of the present invention is not limited thereto, and various modified and improved forms by those having ordinary knowledge in the field to which the present invention pertains also belong to the scope of the rights of the present invention.

Claims

1. A battery pack including a plurality of battery cells, a BDU (Battery Disconnect Unit) including a high-voltage operating element connected to the battery pack and monitoring a current of a battery pack current flowing through the battery pack, a BPCM (Battery Pack Control Module) diagnosing a state of the battery pack based on battery state information indicating the state of the battery pack and transmitting a necessary control command to the BDU based on a result of the diagnosis, wherein the BDU includes a current measurement unit measuring the battery pack current based on a result of sensing the battery pack current, a high-voltage measurement unit measuring a battery pack voltage of the battery pack, an insulation resistance measurement unit measuring an insulation resistance of the battery pack, and a power DC-DC unit generating a power supply voltage necessary for operation of the BDU, wherein the BPCM includes a power DC-DC unit supplying power to the power DC-DC unit of the BDU in an insulated form, a battery device.

2. wherein the BDU further includes a shunt type current sensor for sensing the battery pack current, the battery device according to claim 1.

3. wherein the BDU further includes a hall type current sensor for sensing the battery pack current, wherein the BPCM includes a current measurement unit measuring the battery pack current based on a result sensed from the hall type current sensor, the battery device according to claim 2.

4. wherein the BDU The main positive electrode contact and the main negative electrode contact respectively connected to the positive electrode and the negative electrode of the battery pack, A battery device according to any one of claims 1 to 3, further comprising a contact controller for controlling the operations of the main positive electrode contact and the main negative electrode contact.

5. The BDU A pyro fuse that cuts off the connection between the battery pack and the load by impact, A battery device according to any one of claims 1 to 3, further comprising a pyro fuse controller for controlling the pyro fuse.

6. A main battery device including a main battery pack, A sub-battery device including a sub-battery pack connected to the main battery pack, The main battery device Includes a high-voltage operating element connected to the main battery pack, and a first BDU that monitors the current of the battery pack current flowing through the main battery pack, Diagnoses the state of the main battery pack based on battery state information indicating the state of the main battery pack, and transmits necessary control commands to the first BDU based on the result of the diagnosis. The first BDU A current measurement unit that measures the battery pack current based on the result of sensing the battery pack current, A first high-voltage measurement unit that measures the battery pack voltage of the main battery pack, A first insulation resistance measurement unit that measures the insulation resistance of the main battery pack, Includes a first power DC-DC unit that generates a power supply voltage necessary for the operation of the first BDU. The BPCM A battery system including a power DC-DC unit that supplies power to the first power DC-DC unit in an insulated form.

7. The sub-battery device includes a second BDU including a high-voltage operating element connected to the sub-battery pack, The second BDU includes a second high-voltage measurement unit that measures the battery pack voltage of the sub-battery pack, a second insulation resistance measurement unit that measures the insulation resistance of the sub-battery pack, and a second power DC-DC unit that generates a power supply voltage necessary for the operation of the second BDU. The BPCM includes a power DC-DC unit that supplies power to the second power DC-DC unit in an insulated form, and the battery system according to claim 6.

8. The first BDU further includes a main positive electrode contact and a main negative electrode contact connected to the positive electrode and the negative electrode of the main battery pack respectively, and a contact controller that controls the operation of the main positive electrode contact and the main negative electrode contact, and the battery system according to claim 6.

9. Insulated power is transmitted from the BPCM to the first power DC-DC unit, The first power DC-DC unit supplies a power supply voltage to the insulation measurement unit, the first high-voltage measurement unit, the first insulation resistance measurement unit, and the contact controller with the insulated power, and the battery system according to claim 8.

10. Power is transmitted from the BPCM to the first power DC-DC unit, The first power DC-DC unit includes a DC-DC converter that converts the transmitted power, and a transformer connected to the output of the DC-DC converter, The battery system according to claim 8, wherein a power supply voltage is supplied from the transformer to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the contactor controller.

11. The first BDU includes a pyro fuse that cuts off the connection between the main battery pack and the load by impact, and a pyro fuse controller for controlling the pyro fuse, and further includes the battery system according to claim 6.

12. Insulated power is transmitted from the BPCM to the first power DC-DC unit, The first power DC-DC unit supplies a power supply voltage to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the pyro fuse controller with the insulated power, and the battery system according to claim 11.

13. Power is transmitted from the BPCM to the first power DC-DC unit, The first power DC-DC unit includes a DC-DC converter that converts the transmitted power, and a transformer connected to the output of the DC-DC converter, and a power supply voltage is supplied from the transformer to the insulation measurement unit, the first high voltage measurement unit, the first insulation resistance measurement unit, and the pyro fuse controller, and the battery system according to claim 11.

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