Power maintenance equipment

Abstract

A power maintenance apparatus is disclosed. The power maintenance apparatus includes: a power conversion section that converts a voltage from a battery pack into an operating voltage required for an operation of a controller suitable for managing the battery pack, and supplies the operating voltage to the controller; and a processor controlling the power conversion portion by monitoring a voltage supplied from a vehicle terminal to the controller. The power maintenance apparatus is capable of ensuring uninterrupted power supply to the controller even when power supply from a low voltage terminal to the controller is cut off, thereby allowing the controller to maintain control of the battery pack.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2023-0191326, filed on Dec. 26, 2023, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] Aspects of embodiments of the present disclosure relate to a power maintenance device. Background Art

[0003] A battery management system (BMS) monitors the state of a battery. The BMS may protect the battery pack by controlling a main relay or the like based on information about the state of battery cells in the battery pack.

[0004] The battery pack may have a structure according to two electrical characteristics: low voltage (LV from a 12V / 24V Pb battery) and high voltage (HV from the battery pack voltage). The BMS is provided at the low voltage terminal of the battery pack.

[0005] When a low voltage is input from a vehicle terminal, power is supplied to the microcontroller unit (MCU) of the BMS through a separate ignition circuit.

[0006] However, if the low voltage from the vehicle terminal drops instantaneously, the MCU will not operate.

[0007] As a result, normal functions of the MCU, such as storage, processing, and determination, are turned off, which may endanger vehicle safety related to the vehicle battery pack.

[0008] This section provides background technical information related to the present invention, which is not necessarily prior art. Summary of the Invention

[0009] One aspect of the present invention is to provide a power maintenance device that can ensure uninterrupted power supply to a controller even when power supply from a low voltage terminal to the controller is cut off.

[0010] The above and other aspects and features of the present invention will become readily apparent from the following description of embodiments of the present invention.

[0011] According to one aspect of the present invention, a power maintenance device includes: a power conversion unit that converts a voltage from a battery pack into an operating voltage suitable for operating a controller for managing the battery pack and applies the operating voltage to the controller; and a processor that controls the power conversion unit by monitoring a voltage supplied to the controller from a vehicle terminal.

[0012] According to another aspect of the present invention, a power maintenance device includes: a backup power supply unit that is charged using the voltage supplied from a vehicle terminal and supplies the charged voltage to a controller for managing a battery pack as an operating voltage; and a processor that controls the backup power supply unit by monitoring the voltage supplied from the vehicle terminal to the controller.

[0013] The present invention provides a power maintenance device that can ensure uninterrupted power supply to a controller even when the power supply from a low-voltage terminal to the controller is cut off.

[0014] However, the aspects and features of the present invention are not limited to the above aspects and features, and those skilled in the art will clearly understand other aspects and features not mentioned through the specific embodiments given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings attached to this specification show embodiments of the present disclosure and further describe the aspects and features of the present disclosure together with the specific embodiments of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the drawings:

[0016] Figure 1 is a view of a power maintenance device according to a first embodiment of the present invention;

[0017] Figure 2 is a view of a battery cell provided to a power conversion unit according to the first embodiment;

[0018] Figure 3 is a view of a battery module provided to a power conversion unit according to the first embodiment;

[0019] Figure 4 is a view of a battery pack provided to a power conversion unit according to the first embodiment;

[0020] Figure 5 is a view of a power conversion unit according to the first embodiment;

[0021] Figure 6 is a view of a power maintenance device according to a second embodiment of the present invention; and

[0022] Figure 7 is a view of a backup power supply unit according to the second embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to the ordinary or dictionary meanings, and should be interpreted in the best way based on the concept that the inventor can be his / her own lexicographer to appropriately define the terms, so as to be interpreted as meanings and concepts consistent with the technical concept of the present disclosure.

[0024] The embodiments described in this specification and the configurations shown in the drawings are only some embodiments of the present disclosure, and do not represent all the technical concepts, aspects and features of the present disclosure. Therefore, it should be understood that there may be various equivalent solutions and variant solutions that can replace or modify the embodiments described herein when this application is filed.

[0025] It should be understood that when an element or layer is referred to as being "on", "connected to" or "coupled to" another element or layer, it can be directly on, directly connected or coupled to the other element or layer, or there may also be one or more intermediate elements or layers. When an element or layer is referred to as being "directly on", "directly connected to" or "directly coupled to" another element or layer, there are no intermediate elements or layers. For example, when the first element is described as being "coupled" or "connected" to the second element, the first element can be directly coupled or connected to the second element, or the first element can be indirectly coupled or connected to the second element via one or more intermediate elements.

[0026] In the drawings, for clarity of illustration, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals denote the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items. In addition, when describing embodiments of the present disclosure, the use of "may" relates to "one or more embodiments of the present disclosure". Expressions such as "at least one of..." and "any one of..." modify the entire list of elements when located after the list of elements, rather than modifying individual elements in the list. When phrases such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group consisting of A, B, and C", or "at least one selected from A, B, and C" are used to specify a list of elements A, B, and C, the phrase may refer to any and all suitable combinations or subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the term "use" can be considered synonymous with the term "utilize". As used herein, the terms "substantially", "about" and similar terms are used as approximate terms rather than terms of degree, and are intended to take into account the inherent variability of measured or calculated values that would be recognized by a person of ordinary skill in the art.

[0027] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Thus, without departing from the teachings of the exemplary embodiments, the first element, first component, first region, first layer, or first part discussed below may be referred to as a second element, second component, second region, second layer, or second part.

[0028] For ease of description, spatial relative terms (such as "below", "beneath", "lower", "above", "upper", etc.) may be used herein to describe the relationship of one element or feature to other elements or features as shown in the figures. It should be understood that, in addition to the orientation depicted in the figures, the spatial relative terms are intended to cover different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as "below" or "beneath" other elements or features will be oriented "above" or "on top of" the other elements or features. Thus, the term "below" can cover both the above and below orientations. The device may be oriented in other ways (rotated 90 degrees or at other orientations), and the spatial relative descriptions used herein should be interpreted accordingly.

[0029] The terms used herein are for the purpose of describing embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, the singular forms are also intended to include the plural forms unless the context clearly dictates otherwise. It will be further understood that when used in this specification, the terms "comprises" and / or "comprising" specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0030] In addition, any numerical range disclosed and / or recited herein is intended to include all sub-ranges of the same numerical precision contained within the recited range. For example, the range "1.0 to 10.0" is intended to include all sub-ranges between the recited minimum value of 1.0 and the recited maximum value of 10.0 (and including the minimum value of 1.0 and the maximum value of 10.0), i.e., having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limitation recited herein is intended to include all lower numerical limitations contained therein, and any minimum numerical limitation recited in this specification is intended to include all higher numerical limitations contained therein. Thus, the applicant reserves the right to modify this specification (including the claims) to expressly recite any sub-ranges contained within the ranges expressly recited herein.

[0031] Referring to two compared elements, features, etc. as "identical" may mean that they are "substantially identical". Thus, the phrase "substantially identical" may include cases having deviations that are considered low in the art (e.g., deviations of 5% or less). Additionally, when a certain parameter is said to be uniform in a given region, it may mean that it is uniform in terms of the average value.

[0032] Throughout the specification, unless otherwise specified, each element may be singular or plural.

[0033] When any element is said to be disposed (or located or positioned) "above (or below)" or "on (or under)" a component, it may mean that the any element is placed in contact with the upper surface (or lower surface) of the component, and it may also mean that another component may be interposed between the component and any element disposed (or located or positioned) above (or below) the component.

[0034] Additionally, it should be understood that when an element is said to be "coupled", "linked", or "connected" to another element, the elements may be directly "coupled", "linked", or "connected" to each other, or there may be an intermediate element therebetween through which the elements may be "coupled", "linked", or "connected" to another element. Additionally, when a component is said to be "electrically connected" to another component, the component may be directly connected to the other component, or there may be an intermediate component therebetween such that the component and the other component are indirectly connected to each other.

[0035] Throughout the specification, unless otherwise specified, when stating "A and / or B", it means A, B, or A and B. That is, "and / or" includes any one or all combinations of the listed multiple items. When stating "C to D", unless otherwise specified, it means greater than or equal to C and less than or equal to D.

[0036] Figure 1 is a diagram of a power maintenance device according to a first embodiment of the present invention.

[0037] Referring to Figure 1 , the power maintenance device according to the first embodiment may include a processor 100 and a power conversion unit 200.

[0038] The processor 100 may control the power conversion unit 200 by monitoring the voltage applied to the controller 40 from the vehicle terminal.

[0039] The controller 40 may be an MCU of a battery management system (BMS) that monitors the state of the battery 10 and manages the battery 10. However, the type of the controller 40 is not particularly limited.

[0040] The voltage supplied from the vehicle terminal to the controller 40 can be a low voltage. Generally, the battery pack P can be divided into a low voltage terminal (LV from a 12V / 24V Pb battery) and a high voltage terminal (HV from the battery pack voltage). The BMS can be set at the low voltage terminal. The low voltage terminal can be a built-in Pb battery with a voltage of 12V to 48V.

[0041] Referring Figure 1 , the power supply unit 20 at the vehicle terminal can supply a voltage of 4.5V to 50V. The power supply unit 20 can be a built-in battery with a voltage of 12V to 48V.

[0042] The power management unit 30 can convert the voltage supplied from the power supply unit 20 into the operating voltage required for the operation of the controller 40.

[0043] The operating voltage can be in the range of 3.3V to 5V. Therefore, the power management unit 30 can convert the voltage of 4.5V to 50V supplied from the vehicle terminal into the operating voltage of 3.3V to 5V required for the operation of the controller 40.

[0044] The controller 40 can operate at the operating voltage supplied from the power management unit 30. The controller 40 can control the first relay R1 or the second relay R2 according to the voltage of the battery 10 to cut off or allow the power flowing to / from the battery 10.

[0045] The controller 40 can supply power to the processor 100 through the first transformer TR1.

[0046] The first transformer TR1 can be connected to the controller 40 at its primary side and can be connected to the processor 100 at its secondary side.

[0047] The first transformer TR1 can convert the power supplied from the controller 40 and can supply the converted power to the processor 100.

[0048] Based on the voltage supplied from the first transformer TR1, the processor 100 can determine whether the power is normally supplied from the vehicle terminal to the controller 40. If the operating voltage is not supplied to the controller 40, a normal voltage is not applied to the processor 100 through the first transformer TR1. Based on this, the processor 100 can determine whether the power is normally supplied to the controller 40.

[0049] The processor 100 can compare the voltage supplied from the first transformer TR1 with a predetermined threshold voltage.

[0050] The threshold voltage is a reference voltage for determining whether the voltage supplied to the controller 40 is an abnormal voltage. The threshold voltage can be set to a value less than the operating voltage of the controller 40.

[0051] If the voltage supplied to the controller 40 is less than the threshold voltage, the controller 40 may be in a power-off state or in a state where it is unable to perform normal operations.

[0052] The processor 100 may determine whether to supply a normal voltage from the vehicle terminal to the controller 40 based on the comparison result between the voltage supplied from the first transformer TR1 and the threshold voltage.

[0053] If the voltage supplied from the first transformer TR1 is greater than the threshold voltage, the processor 100 may determine that a normal voltage is supplied from the vehicle terminal to the controller 40.

[0054] If the voltage supplied from the first transformer TR1 is less than the threshold voltage, the processor 100 may determine that an abnormal voltage is supplied from the vehicle terminal to the controller 40.

[0055] When it is determined that an abnormal voltage is supplied from the vehicle terminal to the controller 40, the processor 100 may perform pulse width modulation (PWM) control on the power conversion unit 200 to supply a voltage from the battery 10 to the controller 40.

[0056] The power conversion unit 200 may convert the voltage from the battery 10 into an operating voltage and may apply the operating voltage to the controller 40. That is, when the voltage is not normally supplied from the vehicle terminal to the controller 40, the power conversion unit 200 may convert the voltage from the battery pack P into an operating voltage and may supply the operating voltage to the controller 40. In this way, even when the voltage is not normally supplied from the vehicle terminal to the controller 40, the controller 40 may operate normally. Using the operating voltage supplied from the battery pack P to the controller 40, the controller 40 may check the battery cell voltage, determine the states of the first relay R1 and the second relay R2 to determine whether to turn on or off the relays, or may store data when the BMS is turned off.

[0057] The voltage supplied through the power conversion unit 200 may be the voltage of the entire battery pack P, the voltage of at least one battery module M, or the voltage of at least one battery cell C.

[0058] Figure 2 is a diagram of a battery cell provided to the power conversion unit according to the first embodiment, Figure 3 is a diagram of a battery module provided to the power conversion unit according to the first embodiment, and Figure 4 is a diagram of a battery pack provided to the power conversion unit according to the first embodiment.

[0059] The battery pack P may include one or more battery modules M formed therein and a battery pack case having an accommodation space for accommodating the one or more battery modules M.

[0060] The battery module M may include a plurality of battery cells C and a module housing. The battery module M may include a plurality of battery cells C connected in series or in parallel with each other. One or more battery modules M may be connected in series or in parallel with each other.

[0061] The plurality of battery cells C may be stacked one on top of the other and may be accommodated in the module housing.

[0062] The battery cell C may include a positive electrode lead and a negative electrode lead. Depending on the shape of the battery, the battery cell C may be a cylindrical battery cell, a prismatic battery cell, or a pouch-type battery cell.

[0063] Referring to Figure 2 , the battery cell C may be connected to the primary side of the transformer TR2 of the power conversion unit 200 at both ends thereof, such that the voltage from the battery cell C is supplied to the primary side of the transformer TR2.

[0064] Referring to Figure 3 , the battery module M may be connected to the primary side of the transformer TR2 of the power conversion unit 200 at both ends thereof, such that the voltage from the battery module M is supplied to the primary side of the transformer TR2.

[0065] Referring to Figure 4 , the battery pack P may be connected to the primary side of the transformer TR2 of the power conversion unit 200 at both ends thereof, such that the voltage from the entire battery pack P is supplied to the primary side of the transformer TR2.

[0066] The power conversion unit 200 may convert the voltage from the battery 10 into an operating voltage required to operate the controller 40 that manages the battery 10, and may supply the operating voltage to the controller 40.

[0067] The power conversion unit 200 may be an isolated DC / DC converter.

[0068] The power conversion unit 200 may be a full-bridge converter, a half-bridge converter, an LLC converter, a flyback converter, or a push-pull converter.

[0069] However, the type or structure of the power conversion unit 200 and the type of power conversion performed by the power conversion unit 200 are not particularly limited.

[0070] Figure 5 is a diagram of a power conversion unit according to the first embodiment.

[0071] Figure 5 shows an example in which an isolated DC / DC converter is employed as the power conversion unit 200.

[0072] The transformer TR2 of the power conversion unit 200 may be connected to the battery 10 at its primary side and may be connected to the input terminal of the controller 40 at its secondary side.

[0073] The transformer TR2 may be provided with a switch S1 at its primary side.

[0074] The switch S1 is switched by a PWM control signal from the processor 100 to control the current flow through the primary side of the transformer TR2.

[0075] As described above, the processor 100 can control the current flow through the primary side of the transformer TR2 by performing PWM control on the switch S1. Thus, a voltage is formed at the secondary side of the transformer TR2. Here, the secondary side voltage can be rectified or filtered, and then the capacitor C1 can be charged thereby.

[0076] The capacitor C1 can be connected to the input terminal of the controller 40.

[0077] The voltage charged in the capacitor C1 can be input to the controller 40 as an operating voltage through the input terminal of the controller 40.

[0078] In the first embodiment of the present invention, the voltage from the battery pack P is converted into an operating voltage and supplied to the controller 40. However, the present invention is not limited thereto, and the voltage supplied from the vehicle terminal can be used as the operating voltage of the controller 40. This will be described in detail with reference to Figure 6 and Figure 7 Detailed description.

[0079] In the second embodiment of the present invention, the components identical to those in the first embodiment are denoted by the same reference numerals, and their detailed descriptions will be omitted.

[0080] Figure 6 is a diagram of a power maintenance device according to the second embodiment of the present invention, and Figure 7 is a diagram of a backup power supply unit according to the second embodiment of the present invention.

[0081] Referring to Figure 6 , the power maintenance device according to the second embodiment may include a backup power supply unit 300, a processor 400, and a power supply switching unit 500.

[0082] The backup power supply unit 300 can be charged using the voltage supplied from the vehicle terminal, and can supply the charged voltage as an operating voltage to the controller 40.

[0083] The backup power supply unit 300 can be a non-isolated DC / DC converter.

[0084] The backup power supply unit 300 can be a buck-boost converter.

[0085] The backup power supply unit 300 can operate in a buck mode or a boost mode according to the magnitude of the operating voltage relative to the voltage supplied from the vehicle terminal.

[0086] The voltage supplied from the vehicle terminal can be in the range of 4.5V to 50V. In order to convert the voltage supplied from the vehicle terminal into the operating voltage required for the operation of the controller 40, the backup power supply unit 300 can operate in a buck mode or a boost mode. For example, when the operating voltage of the controller 40 is 3.3V or 5V, the backup power supply unit 300 can operate in the buck mode to convert the voltage supplied from the vehicle terminal into the operating voltage.

[0087] The voltage charged in the backup power supply unit 300 can be 6V. However, the voltage charged in the backup power supply unit 300 is not particularly limited and can be changed as needed.

[0088] In Figure 6 , reference numeral 50 is an analog front end (AFE) 50 that monitors the voltage, current, and temperature of the battery.

[0089] Figure 7 An example in which a non-isolated buck-boost DC / DC converter is used as the backup power supply unit 300 is shown.

[0090] The backup power supply unit 300 may include a first switch Q1 to a fourth switch Q4, an inductor L, and a charging unit C2 or B.

[0091] The first switch Q1 and the second switch Q2 may be connected in series, and the third switch Q3 and the fourth switch Q4 may be connected in series. The first switch Q1 to the fourth switch Q4 can be switched according to the operation mode of the backup power supply unit 300.

[0092] When the backup power supply unit 300 operates in the buck mode, the first switch Q1 and the second switch Q2 can be switched complementarily, the third switch Q3 can be turned on, and the fourth switch Q4 can be turned off.

[0093] When the backup power supply unit 300 operates in the boost mode, the third switch Q3 and the fourth switch Q4 can be switched complementarily, the first switch Q1 can be turned on, and the second switch Q2 can be turned off.

[0094] The inductor L can be connected to the node between the first switch Q1 and the second switch Q2 at one side thereof, and can be connected to the node between the third switch Q3 and the fourth switch Q4 at the other side thereof. When the first switch Q1 to the fourth switch Q4 are switched as described above, the inductor L can store energy and supply the stored energy to the charging unit C2 or B.

[0095] The charging unit C2 or B can be charged with the energy supplied from the inductor L and supply the charged energy to the controller 40. The charging unit C2 or B can be a capacitor C capable of temporarily storing energy or a battery B with a relatively small capacity.

[0096] The power supply switching unit 500 can selectively supply the operating voltage supplied from the backup power supply unit 300 to the controller 40.

[0097] The power supply switching unit 500 can be a triple-pole switch. The triple-pole switch can have a first terminal connected to the controller 40 as a common terminal, a second terminal connected to the power management unit 30, and a third terminal connected to the backup power supply unit 300.

[0098] According to whether the normal voltage is supplied to the controller 40, the first terminal can be connected to one of the second terminal and the third terminal.

[0099] When the normal voltage is supplied to the controller 40, the first terminal can be connected to the second terminal according to the control signal from the processor 400. Thus, the voltage supplied from the vehicle terminal is supplied to the controller 40 through the power management unit 30.

[0100] When an abnormal voltage is supplied to the controller 40, the first terminal can be connected to the third terminal according to the control signal from the processor 400. Thus, the voltage charged in the backup power supply unit 300 is supplied to the controller 40 as the operating voltage.

[0101] The processor 400 can control the backup power supply unit 300 by monitoring the voltage input from the vehicle to the controller 40.

[0102] The processor 400 can control the backup power supply unit 300 based on the comparison result between the voltage applied from the vehicle terminal to the controller 40 and a predetermined threshold voltage.

[0103] When the voltage applied from the vehicle terminal to the controller 40 is less than the threshold voltage, the processor 400 can cause the backup power supply unit 300 to operate in a buck mode or a boost mode according to the magnitude of the operating voltage relative to the voltage supplied from the vehicle terminal.

[0104] When the backup power supply unit 300 operates in the buck mode, the processor 400 charges the charging unit C2 or B by complementarily switching the first switch Q1 and the second switch Q2, turning on the third switch Q3, and turning off the fourth switch Q4.

[0105] When the backup power supply unit 300 operates in the boost mode, the processor 400 charges the charging unit C2 or B by complementarily switching the third switch Q3 and the fourth switch Q4, turning on the first switch Q1, and turning off the second switch Q2.

[0106] The processor 400 can connect the controller 40 to the backup power supply unit 300 by controlling the power supply switching unit 500. Thus, the operating voltage charged in the backup power supply unit 300 is supplied to the controller 40 through the power supply switching unit 500.

[0107] In the first and second embodiments of the present invention, a processor may be connected to a memory (not shown) and may execute instructions stored in the memory. By executing the instructions stored in the memory, the processor may control one or more other components (e.g., hardware components or software components) connected to the processor and may perform various data processing and computing tasks.

[0108] Additionally, the processor may be composed of components configured to perform different functions and separated from each other at the hardware, software, or logic level. In this case, dedicated hardware may be used to perform each function. To this end, the processor may be implemented as or include at least one selected from an application specific integrated circuit (ASIC), a digital signal processor (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a microcontroller, and / or a microprocessor.

[0109] The processor may be implemented as a central processing unit (CPU) or a system on a chip (SoC), and may run an operating system or an application to control multiple hardware components or software components connected to the processor and may perform various data processing and computing. The processor may be configured to execute at least one instruction stored in the memory and store the data generated by the execution in the memory.

[0110] As used herein, the term "unit" may include a unit implemented in hardware, software, or firmware and may be used interchangeably with terms such as logic, logic block, component, or circuit. A "unit" may be a monolithic component or the smallest unit or part of a component that performs one or more functions. For example, according to one embodiment, a "unit" may be implemented in the form of an application specific integrated circuit (ASIC).

[0111] Although the present invention has been described with reference to some embodiments and the drawings showing aspects of the present invention, the present invention is not limited thereto. Those skilled in the art to which the present invention pertains may make various modifications and variations within the scope of the technical spirit of the present invention and the claims and their equivalents.

Claims

1. An electric power maintenance device, comprising: a power conversion section that converts a voltage from a battery pack into an operating voltage required for an operation of a controller suitable for managing the battery pack and supplies the operating voltage to the controller; as well as A processor controls the power conversion unit by monitoring a voltage supplied from a vehicle terminal to the controller.

2. The power maintenance equipment according to claim 1, wherein: The power conversion unit is an isolated DC / DC converter.

3. The power maintenance equipment according to claim 2, wherein: The power conversion portion includes at least one selected from a full-bridge converter, a half-bridge converter, an LLC converter, a flyback converter, and a push-pull converter.

4. The power maintenance equipment according to claim 1, wherein: The power conversion section converts a voltage from the entire battery pack into the operating voltage.

5. The power maintenance equipment according to claim 1, wherein: The power conversion section converts a voltage from at least one battery cell in the battery pack into the operating voltage.

6. The power maintenance equipment according to claim 1, wherein: The power conversion unit converts a voltage from at least one battery module in the battery pack into the operating voltage.

7. The power maintenance equipment according to claim 1, wherein: The processor controls the power conversion portion based on a comparison result between a voltage supplied from the vehicle terminal to the controller and a predetermined threshold voltage.

8. The power maintenance equipment according to claim 7, wherein: The predetermined threshold voltage is set to a value smaller than the operating voltage.

9. An electric power maintenance device, comprising: a backup power supply section that is charged with a voltage supplied from a vehicle terminal and supplies the charged voltage to a controller that manages the battery pack as an operating voltage; as well as A processor controls the backup power supply unit by monitoring a voltage supplied from the vehicle terminal to the controller.

10. The power maintenance equipment according to claim 9, wherein: The backup power supply unit is a non-isolated DC / DC converter.

11. The power maintenance equipment according to claim 9, wherein: The backup power supply unit is a buck-boost converter.

12. The power maintenance device according to claim 11, wherein: The backup power supply section operates in a step-down mode or a step-up mode according to the magnitude of the operating voltage relative to the voltage supplied from the vehicle terminal.

13. The power maintenance device according to claim 9, wherein: The processor controls the backup power supply portion based on a comparison result between a voltage supplied from the vehicle terminal to the controller and a predetermined threshold voltage.

14. The power maintenance device according to claim 13, wherein: The predetermined threshold voltage is set to a value smaller than the operating voltage.

15. The power maintenance device according to claim 9, further comprising: The power switching unit selectively supplies the operating voltage from the backup power supply unit to the controller.

16. The power maintenance device according to claim 15, wherein: The power switching unit is a three-pole switch having a first terminal connected to the controller, a second terminal for transmitting the voltage from the vehicle terminal, and a third terminal connected to the backup power supply unit, and depending on the voltage supplied from the vehicle terminal to the controller, the first terminal is connected to the second terminal to supply the voltage from the vehicle terminal to the controller, or is connected to the third terminal to supply the operating voltage from the backup power supply unit to the controller.

Images