Battery pack and method of operating battery pack

Abstract

A battery pack and a method of operating a battery pack are disclosed. The battery pack comprises a battery module; a module battery management system (BMS) configured to monitor the battery module; a main BMS configured to exchange radio signals with the module BMS through wireless communication; and a signal reflecting unit configured to reflect the radio signal exchanged between the module BMS and the main BMS toward the module BMS or the main BMS.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0031529 filed on March 5, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] One or more embodiments relate to a battery pack including a battery management system (BMS) for wireless communication and a method of operating the battery pack. Background Art

[0003] Unlike primary batteries, which cannot be recharged, secondary batteries can be charged and discharged. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, multi-function phones, notebook computers, digital cameras, and video cameras, while high-capacity secondary batteries are used as motor drive power sources and energy storage batteries for hybrid vehicles and electric vehicles. Such secondary batteries may include an electrode assembly containing a cathode and an anode, a housing that houses the electrode assembly, and electrode terminals connected to the electrode assembly.

[0004] To configure battery packs for electric vehicles that include such secondary batteries, wireless battery management system (BMS) technology is attracting attention. Wireless BMS has the advantage of not requiring cables for inter-module communication. However, as wired communication is replaced by wireless communication, communication quality is inevitably affected by antenna sensitivity in receiving or transmitting scenarios, and if communication quality deteriorates, stable BMS operation becomes difficult to achieve.

[0005] The above information disclosed in this technical section serving as background for the present disclosure is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] One or more embodiments include a battery pack including a wirelessly communicating battery management system (BMS).

[0007] However, the technical problems to be solved by the present disclosure are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those having ordinary skill in the art from the description of the present disclosure provided below.

[0008] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments presented herein.

[0009] According to one or more embodiments, a battery pack includes: a battery module; a module battery management system (BMS) configured to monitor the battery module; a main BMS configured to exchange radio signals with the module BMS through wireless communication; and a signal reflecting unit configured to reflect the radio signals exchanged between the module BMS and the main BMS toward the module BMS or the main BMS.

[0010] According to an example, the module BMS may include a module BMS antenna unit configured to exchange a radio signal with the main BMS.

[0011] According to another example, the master BMS may include a master BMS antenna unit configured to exchange a radio signal with the module BMS.

[0012] According to another example, the signal reflecting unit may have a structure having a parabolic surface.

[0013] According to another example, the signal reflecting unit may be located at a distance from the master BMS antenna unit of the master BMS, the distance being equal to the focal length of the parabola, so that the master BMS antenna unit is located at the focus of the parabola.

[0014] According to another example, the signal reflecting unit may have a structure configured to reflect the radio signal transmitted from the master BMS antenna unit toward the module BMS antenna unit.

[0015] According to another example, the signal reflecting unit may have a structure configured to reflect the radio signal transmitted from the module BMS antenna unit toward the master BMS antenna unit.

[0016] According to another example, the signal reflecting unit may have a structure having a surface facing the main BMS antenna unit, the surface being plated with a conductive metal.

[0017] According to another example, the signal reflecting unit may have a structure in which a focal length of a parabola is preset based on positions of the main BMS antenna unit and the module BMS antenna unit.

[0018] According to another example, the signal reflecting unit may have a structure in which a focal length of a parabola is preset such that a radio signal transmitted from the main BMS antenna unit is reflected and directed toward the module BMS antenna unit.

[0019] According to one or more embodiments, a method of operating a battery pack including a battery module, a module battery management system (BMS), a main BMS, and a signal reflection unit includes: monitoring the battery module by the module BMS; exchanging radio signals with the module BMS through wireless communication by the main BMS; and reflecting the radio signals exchanged between the module BMS and the main BMS toward the module BMS or the main BMS by the signal reflection unit.

[0020] According to an example, the module BMS may include a module BMS antenna unit, and the exchanging may include the module BMS antenna unit exchanging radio signals with the master BMS.

[0021] According to another example, the master BMS may include a master BMS antenna unit, and the exchanging may further include the master BMS antenna unit exchanging radio signals with the module BMS.

[0022] According to another example, the signal reflecting unit may have a structure having a parabolic surface.

[0023] According to another example, the signal reflecting unit may be located at a distance from the master BMS antenna unit of the master BMS, the distance being equal to the focal length of the parabola, so that the master BMS antenna unit is located at the focus of the parabola.

[0024] According to another example, the reflecting may include reflecting, by the signal reflecting unit, the radio signal transmitted from the master BMS antenna unit toward the module BMS antenna unit.

[0025] According to another example, the reflecting may include reflecting, by the signal reflecting unit, the radio signal transmitted from the module BMS antenna unit toward the master BMS antenna unit.

[0026] According to another example, the signal reflecting unit may have a structure having a surface facing the main BMS antenna unit, the surface being plated with a conductive metal.

[0027] According to another example, the signal reflecting unit may have a structure in which a focal length of a parabola is preset based on positions of the main BMS antenna unit and the module BMS antenna unit.

[0028] According to another example, the signal reflecting unit may have a structure in which a focal length of a parabola is preset such that reflecting includes reflecting and directing a radio signal transmitted from the master BMS antenna unit toward the module BMS antenna unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present disclosure and, together with the detailed description of the present disclosure provided later, are used to further understand the technical concept of the present disclosure, and thus the present disclosure should not be construed as limited to the contents shown in these drawings.

[0031] Figure 1 schematically illustrates a battery pack according to an embodiment of the present disclosure;

[0032] Figure 2 schematically illustrates a vehicle body including a battery pack according to an embodiment of the present disclosure;

[0033] Figure 3 is a diagram illustrating a structure using which a radio signal is reflected from a signal reflecting unit according to an embodiment of the present disclosure; and

[0034] Figure 4 is a diagram illustrating a focal length of a parabola of a signal reflecting unit according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will now be described in detail with reference to the examples thereof illustrated in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, the current embodiment may have different forms and should not be construed as being limited to the description set forth herein. Accordingly, the embodiments are described below only with reference to the accompanying drawings to illustrate the aspects of the current description. As used in this article, the term "and / or" includes any and all combinations of one or more of the relevant listed items. If an expression such as "at least one of ... " follows the list of elements, the entire list of the modified elements is not modified for the individual elements of the list.

[0036] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Based on the principle that the inventors can appropriately define the concept of terms to describe their inventions in the best way, the terms and words used in this specification and the above claims should not be interpreted as limited to the ordinary meaning or dictionary meaning, and should be interpreted as meanings and concepts consistent with the technical ideas of the present disclosure. Therefore, it should be understood that the constructions shown in the drawings and the embodiments described in this specification are merely the most preferred embodiments of the present disclosure and do not represent all the technical ideas of the present disclosure, so when submitting this application, there may be various equivalents and variations that replace them. If used in this article, "including, containing" indicates the existence of the mentioned shapes, quantities, steps, operations, components, parts and / or their groups, and does not exclude the existence or addition of one or more different shapes, quantities, steps, operations, components, parts and / or their groups. When describing an embodiment of the present disclosure, "can" or "may" include "one or more embodiments of the present disclosure".

[0037] To help understand the present disclosure, the accompanying drawings are not shown according to actual scale, but the sizes of some components may be exaggerated. In different embodiments, the same reference numerals may be given to the same components.

[0038] A statement that two comparison targets are "the same" as each other may mean that they are "substantially the same" as each other. Therefore, cases where they are "substantially the same" as each other may include cases where they have a deviation that is considered to be low (e.g., a deviation of 5% or less). If a uniform parameter is uniform in a predetermined area, it may mean that it is uniform from an average perspective.

[0039] Although the first, second, etc. can be used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components, and unless there is a specific description to the contrary, the first component may be the second component.

[0040] Throughout the specification, unless specifically described otherwise, each component may be in the singular or in the plural.

[0041] If a component is arranged on the “top (or bottom)” of another component or “on” the other component (or “under” the other component), it not only means that the component is arranged adjacent to the top surface (or bottom surface) of the other component, but also means that another component may be interposed between the other component and the component (for example, arranged on the other component (or arranged under the other component)).

[0042] If a component is described as being “coupled” or “connected” to another component, it should be understood that the components are directly connected or connectable to each other, but another component may be “interposed” between the components, or the components may be “coupled” or “connected” to each other through another component. If one part is electrically coupled to another part, this may include not only a case where they are directly connected to each other but also a case where they are connected to another element in between.

[0043] Throughout the specification, unless otherwise specifically stated, "A and / or B" may mean A, B, or A and B. That is, "and / or" may include all or any combination of the listed items. Unless otherwise specifically stated, "C to D" may mean at least C but no more than D.

[0044] Figure 1 A battery pack according to an embodiment of the present disclosure is schematically shown.

[0045] refer to Figure 1 , the battery pack 100 according to an embodiment of the present disclosure may include a signal reflecting unit 110, a main battery management system (BMS) 130, module BMSs 140, 150, 160, 170, 180 and 190, a main BMS antenna unit 135 and module BMS antenna units 145, 155, 165, 175, 185 and 195.

[0046] The battery pack 100 according to an embodiment of the present disclosure may include at least one battery module and a battery pack housing having a housing formed therein to accommodate the at least one battery module. The battery module may include a module housing and a plurality of battery cells. The battery cells may be housed in the module housing in a stacked form. Each battery cell may include an anode lead and a cathode lead. Depending on the shape of the battery, the battery cells may be round, prismatic, or pouch-shaped.

[0047] The battery module may include at least one battery cell which may be a rechargeable secondary battery. For example, the battery cell may include at least one selected from the group consisting of nickel-cadmium batteries, lead-acid batteries, nickel metal hydride batteries (NiMH), lithium-ion batteries, lithium polymer batteries, etc.

[0048] The number of battery cells included in the battery module and their connection scheme can be determined based on the power and voltage required by the battery pack 100. For example, the battery cells can be connected in parallel with each other or in parallel and in series. The battery pack 100 can include multiple battery modules connected in series, in parallel, or in series and in parallel. A battery module can include one battery cell.

[0049] The battery pack 100 according to an embodiment of the present disclosure may include a main BMS 130 and module BMSs 140, 150, 160, 170, 180, and 190. The main BMS 130 and the module BMSs 140, 150, 160, 170, 180, and 190 may represent BMSs for managing a battery pack and a battery module, respectively. For example, a BMS may include a detection device, a balancing device, and a control device. For example, referring to Figure 1 , the module BMSs 140, 150, 160, 170, 180, and 190 can monitor the battery modules respectively. For example, the first module BMS 140 can monitor the first battery module, the second BMS 150 can monitor the second battery module, the third module BMS 160 can monitor the third battery module, the fourth module BMS 170 can monitor the fourth battery module, the fifth module BMS 180 can monitor the fifth battery module, and the sixth module BMS 190 can monitor the sixth battery module. The main BMS 130 can manage the battery pack 100. The main BMS 130 and the module BMSs 140, 150, 160, 170, 180, and 190 can exchange radio signals with each other through wireless communication.

[0050] The detection device can sense the battery status (voltage, current, temperature, etc.) to detect status information indicating the battery status. The detection device can detect the voltage of each battery cell or each battery module of the battery pack 100. The detection device can detect the current flowing through the battery module or each battery module of the battery pack. The detection device can detect the temperature of the battery cell and / or battery module or the ambient temperature at at least one point of the battery.

[0051] The balancing device may perform a balancing operation on the battery modules and / or battery cells of the battery pack 100 .

[0052] The control device can receive status information (voltage, current, temperature, etc.) of the battery module from the detection device. The control device can monitor and calculate the status of the battery module (voltage, current, temperature, state of charge (SOC), life, state of health (SOH), etc.) based on the status information received from the detection device. Based on the status monitoring results, the control device can perform control functions (for example, temperature control, balance control, charge / discharge control, etc.), protection functions (for example, preventing over-discharge, overcharging and overcurrent, short circuit, fire extinguishing, etc.), etc. The control device can also perform wired or wireless communication functions with external devices of the battery pack (for example, advanced controllers, vehicles, chargers, PCS, etc.). In addition, the control device can control the charge / discharge operation and protection operation of the battery. To this end, the control device may include a charge / discharge controller, a balance controller, and a protection unit.

[0053] A BMS, which is a system that monitors the status of the battery and performs diagnostics and control, communication, and protection, can calculate the charge / discharge status, calculate the battery's life or state of health (SOH), block power to the battery (relay control) if necessary, control thermal management (cooling, heating, etc.), perform high-voltage interlock functions, and detect or calculate insulation and short-circuit conditions.

[0054] According to an embodiment of the present disclosure, the master BMS 130 may include a master BMS antenna unit 135. The module BMSs 140, 150, 160, 170, 180, and 190 may include module BMS antenna units 145, 155, 165, 175, 185, and 195, respectively. For example, the master BMS antenna unit 135 and the module BMS antenna units 145, 155, 165, 175, 185, and 195 may represent antenna devices that perform wireless communication. For example, by using the master BMS antenna unit 135 and the module BMS antenna units 145, 155, 165, 175, 185, and 195, the master BMS 130 and the module BMSs 140, 150, 160, 170, 180, and 190 may exchange radio signals with each other through wireless communication. For example, the antenna device used and the wireless communication scheme may be known devices and schemes, respectively.

[0055] The battery pack 100 according to an embodiment of the present disclosure may include a signal reflection unit 110. For example, the signal reflection unit 110 may be a structure having a surface facing an antenna radiating a radio signal, wherein the surface is plated with a conductive metal to reflect the radio signal. For example, the signal reflection unit 110 may represent a structure that reflects the radio signal exchanged between the module BMSs 140, 150, 160, 170, 180, and 190 and the main BMS 130 toward the module BMSs 140, 150, 160, 170, 180, and 190 or the main BMS 130.

[0056] Figure 2 A vehicle body including a battery pack according to an embodiment of the present disclosure is schematically shown.

[0057] refer to Figure 2 , shows a structure in which a battery pack 100 according to an embodiment of the present disclosure is provided under a vehicle body. For example, the battery pack 100 may include six battery modules. For example, the six battery modules may be electrically connected to each other in series / parallel or in a combination of series / parallel. Figure 2 As shown in FIG, module BMSs 140, 150, 160, 170, 180, and 190 may be provided in corresponding battery modules. The module BMSs 140, 150, 160, 170, 180, and 190 may respectively include module BMS antenna units 145, 155, 165, 175, 185, and 195 that exchange radio signals with the master BMS 130. The master BMS 130 may include a main BMS antenna unit 135 that exchanges radio signals with the module BMS antenna units 145, 155, 165, 175, 185, and 195 of the respective module BMSs 140, 150, 160, 170, 180, and 190.

[0058] The signal reflecting unit 110 may have a structure having a parabolic surface. For example, the signal reflecting unit 110 may have a structure in which the surface facing the main BMS antenna unit 135 or the module antenna units 145, 155, 165, 175, 185, and 195 has a parabolic surface plated with a conductive metal.

[0059] Figure 3 is a diagram illustrating a structure using which a radio signal is reflected from a signal reflecting unit according to an embodiment of the present disclosure. Figure 4 is a diagram illustrating a focal length of a parabola of a signal reflecting unit according to an embodiment of the present disclosure.

[0060] Reference together Figures 3 and 4, the signal reflecting unit 110 according to an embodiment of the present disclosure may have a structure using a parabolic structure of a parabolic antenna such as a satellite antenna, thereby improving sensitivity by enhancing the directivity of a radio signal in radio signal reception or transmission of the main BMS antenna unit 135 of the main BMS 130.

[0061] For example, Figure 3 and Figure 4 As shown in , the signal reflecting unit 110 may be provided so that the main BMS antenna unit 135 is located at the focus F of the signal reflecting unit 110. For example, the signal reflecting unit 110 may be located at a distance from the main BMS antenna unit 135 of the main BMS 130 that is equal to the focal length a of the parabola, so that the main BMS antenna unit 135 is located at the focus F of the parabola. For example, the curvature of the parabola of the signal reflecting unit 110 may be precalculated and preset.

[0062] The signal reflecting unit 110 may have a structure that reflects the radio signal transmitted from the main BMS antenna unit 135 toward the module BMS antenna units 145, 155, 165, 175, 185, and 195. The signal reflecting unit 110 may have a structure that reflects the radio signal transmitted from the module BMS antenna units 145, 155, 165, 175, 185, and 195 toward the main BMS antenna unit 135. For example, Figure 3 As shown in , the radio signal transmitted from the main BMS antenna unit 135 located at the focus F may be reflected from the reflection points P1, P2, and P3 of the signal reflecting unit 110, and may propagate toward the points Q1, Q2, and Q3 of the module BMS antenna units 145, 155, 165, 175, 185, and 195. For example, the module BMS antenna units 145, 155, 165, 175, 185, and 195 may be disposed at the points Q1, Q2, and Q3 toward which the radio signal is directed after being reflected from the reflection points P1, P2, and P3.

[0063] The signal reflecting unit 110 may have a structure in which a surface facing the main BMS antenna unit 135 is plated with a conductive metal. In the signal reflecting unit 110 according to some embodiments of the present disclosure, the inner surface of the semicircular shape is electroplated with a conductive metal to act as a radio signal reflecting plate, thereby improving the directivity of the radio signal toward the main BMS antenna unit 135 or the module BMS antenna units 145, 155, 165, 175, 185 and 195 and thus improving the sensitivity of receiving or transmitting the radio signal.

[0064] The signal reflecting unit 110 may have a structure in which a focal length of a parabola is preset based on positions of the main BMS antenna unit 135 and the module BMS antenna units 145 , 155 , 165 , 175 , 185 , and 195 .

[0065] The signal reflecting unit 110 may have a structure in which a focal length of a parabola is preset such that a radio signal transmitted from the main BMS antenna unit 135 is reflected and directed toward the module BMS antenna units 145 , 155 , 165 , 175 , 185 , and 195 .

[0066] For example, Figure 4 As shown in , according to an embodiment of the present disclosure, the main BMS antenna unit 135 may be disposed at a focus F of the parabola of the signal reflecting unit 110 .

[0067] The curvature of the parabola of the signal reflecting unit 110 may be calculated as follows.

[0068] a=(D×D) / (16×c)

[0069] Here, a may be a focal length of the signal reflecting unit 110 , c may be a depth of the signal reflecting unit 110 , and D may be a width of the signal reflecting unit 110 .

[0070] For example, in the signal reflecting unit 110 having D of about 10 cm and c of about 1 cm, the main BMS antenna unit 135 may be located at a focal length of about 6.25 cm from the center of the signal reflecting unit 110 .

[0071] According to the present disclosure, the sensitivity of an antenna responsible for receiving or transmitting data in a wireless BMS may be improved by a signal reflecting unit included in the wireless BMS.

[0072] The signal reflecting unit according to the present disclosure may have a structure in which a surface visible to the antenna and having a semicircular shape is plated with metal to improve the directivity of the signal in a desired direction in wireless reception or transmission via the antenna, thereby improving wireless sensitivity, and the principle of a parabolic antenna with a parabolic surface is applied to a wireless BMS, thereby improving the performance of the wireless antenna.

[0073] Although the present disclosure describes some embodiments and drawings, the present disclosure is not limited thereto, and a person skilled in the art may make various modifications and changes within the technical spirit of the present disclosure and the equivalent scope of the claims.

[0074] The various embodiments of the present disclosure can be implemented in the form of a computer program that can be executed on a computer through various components, and the computer program can be recorded on a computer-readable medium. The medium can continuously store the executable program or temporarily store the executable program for execution or downloading. The medium can include various recording devices or storage devices in the form of a single hardware or a combination of several hardwares, and can be distributed on a network, without being limited to the medium directly connected to a specific computer system. Examples of media can include magnetic media such as hard disks, floppy disks and tapes, optical recording media such as compact disks (CDs) read-only memories (ROMs) and digital versatile disks (DVDs), magneto-optical media such as optical magnetic floppy disks, ROMs, random access memories (RAMs), flash memories, etc., to store program instructions. Other examples of media can include recording media or storage media managed by application stores that distribute applications, websites that supply or distribute various software, servers, etc.

[0075] In the specification, the terms "unit", "module", etc. may refer to a hardware component such as a processor or a circuit and / or a software component executed by a hardware component such as a processor. For example, a "unit", "module", etc. may be implemented by components such as a software component, an object-oriented software component, a class component and a task component, a process, a function, a property, a procedure, a subroutine, a program code segment, a driver, firmware, microcode, a circuit, data, a database, a data structure, a table, an array, and a variable.

[0076] According to the present disclosure, in a battery pack including a BMS that performs wireless communication, the reception or transmission sensitivity of an antenna included in the BMS can be effectively improved.

[0077] However, the effects that can be obtained by the present disclosure are not limited to the above-mentioned effects, and those having ordinary skill in the art can clearly understand other technical effects that are not mentioned from the following description of the present disclosure.

[0078] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the claims.

Claims

1. A battery pack comprising: Battery modules; a module BMS configured to monitor the battery module; a master BMS configured to exchange radio signals with the module BMS via wireless communication; as well as A signal reflecting unit is configured to reflect the radio signal exchanged between the module BMS and the master BMS toward the module BMS or the master BMS.

2. The battery pack according to claim 1, wherein: The module BMS includes a module BMS antenna unit configured to exchange the radio signal with the main BMS.

3. The battery pack according to claim 2, wherein: The master BMS includes a master BMS antenna unit configured to exchange the radio signal with the module BMS.

4. The battery pack according to claim 3, wherein: The signal reflecting unit has a structure having a parabolic surface.

5. The battery pack according to claim 4, wherein: The signal reflecting unit is located at a distance from the main BMS antenna unit of the main BMS, where the distance is equal to the focal length of the parabola, so that the main BMS antenna unit is located at the focus of the parabola.

6. The battery pack according to claim 5, wherein: The signal reflecting unit has a structure configured to reflect the radio signal transmitted from the master BMS antenna unit toward the module BMS antenna unit.

7. The battery pack according to claim 5, wherein: The signal reflecting unit has a structure configured to reflect the radio signal transmitted from the module BMS antenna unit toward the master BMS antenna unit.

8. The battery pack according to claim 5, wherein: The signal reflecting unit has a structure having a surface facing the main BMS antenna unit, and the surface is plated with a conductive metal.

9. The battery pack according to claim 5, wherein: The signal reflecting unit has a structure in which the focal length of the parabola is preset based on positions of the main BMS antenna unit and the module BMS antenna unit.

10. The battery pack according to claim 9, wherein: The signal reflecting unit has a structure in which the focal length of the parabola is preset so that the radio signal transmitted from the main BMS antenna unit is reflected and directed toward the module BMS antenna unit.

11. A method for operating a battery pack, the battery pack comprising a battery module, a module BMS, a main BMS, and a signal reflection unit, the method comprising: The module BMS monitors the battery module; The main BMS exchanges radio signals with the module BMS via wireless communication; as well as The radio signal exchanged between the module BMS and the master BMS is reflected by the signal reflecting unit toward the module BMS or the master BMS.

12. The method according to claim 11, wherein The module BMS includes a module BMS antenna unit, and the exchanging includes the module BMS antenna unit exchanging the radio signal with the master BMS.

13. The method according to claim 12, wherein: The master BMS includes a master BMS antenna unit, and the exchanging further includes the master BMS antenna unit exchanging the radio signal with the module BMS.

14. The method according to claim 13, wherein The signal reflecting unit has a structure having a parabolic surface.

15. The method according to claim 14, wherein The signal reflecting unit is located at a distance from the main BMS antenna unit of the main BMS, where the distance is equal to the focal length of the parabola, so that the main BMS antenna unit is located at the focus of the parabola.

16. The method according to claim 15, wherein The reflecting includes reflecting, by the signal reflecting unit, the radio signal transmitted from the main BMS antenna unit toward the module BMS antenna unit.

17. The method according to claim 15, wherein: The reflecting includes reflecting, by the signal reflecting unit, the radio signal transmitted from the module BMS antenna unit toward the main BMS antenna unit.

18. The method according to claim 15, wherein The signal reflecting unit has a structure having a surface facing the main BMS antenna unit, and the surface is plated with a conductive metal.

19. The method according to claim 15, wherein The signal reflecting unit has a structure in which the focal length of the parabola is preset based on positions of the main BMS antenna unit and the module BMS antenna unit.

20. The method according to claim 19, wherein The signal reflecting unit has a structure in which the focal length of the parabola is preset so that the reflecting includes reflecting and directing the radio signal transmitted from the main BMS antenna unit toward the module BMS antenna unit.

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