Battery management system and communication management method thereof

Abstract

A battery management system is disclosed, comprising a light receiving unit that generates a voltage based on light having communication information received from an external battery management system, a light emitting unit that transmits light having communication information to an external battery management system, and a control unit, wherein the control unit is configured to check a voltage value generated by the light receiving unit in correspondence with the intensity of light received from the external battery management system based on the intensity of light received from the external battery management system, and to adjust the intensity of light transmitted by the light emitting unit based on the checked voltage value.

Description

Technology Field

[0001] The present disclosure relates to an optical feedback communication method and a battery management system for performing the same. Background Technology

[0002] Battery Management Systems (BMS) are used to control batteries efficiently and smoothly. For example, a BMS measures the current, voltage, or temperature of batteries installed in electric vehicles (BEVs) or energy storage systems (ESS) using sensors and utilizes this data appropriately to manage battery life, performance, and safety, thereby controlling the battery to ensure optimal performance.

[0003] To this end, multiple battery management systems in the battery need to exchange data and various information with each other via wired or wireless communication. The problem to be solved

[0004] The technical problems to be solved by this embodiment are not limited to those described above, and other technical problems can be inferred from the following embodiments. means of solving the problem

[0005] A battery management system according to one embodiment includes: a light receiving unit that generates a voltage based on light having communication information received from an external battery management system; a light emitting unit that transmits light having communication information to the external battery management system; and a control unit, wherein the control unit may be configured to check the voltage value of the voltage generated by the light receiving unit in correspondence with the intensity of the light received from the external battery management system, and to adjust the intensity of the light transmitted by the light emitting unit based on the checked voltage value.

[0006] The above control unit can control the intensity of light transmitted from the light-emitting unit to the external battery management system to increase when the intensity of light received from the external battery management system decreases.

[0007] The control unit can adjust the intensity of light transmitted from the light-emitting unit to the external battery management system so that the confirmed voltage value and the designated target voltage value become the same.

[0008] The specified target voltage value can be determined based on the power consumption of communication between the battery management system and the external battery management system.

[0009] The control unit may include: a first operational amplifier that outputs a duty voltage signal by comparing the confirmed voltage value with a designated target voltage value; a pulse width modulation (PWM) logic circuit that determines the duty ratio for the duty voltage signal; a gate driver circuit connected to the PWM logic circuit and controlling the duty ratio; a buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on the driving voltage and the duty ratio; and a negative feedback circuit including a second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light-emitting unit.

[0010] The first operational amplifier can increase the duty voltage signal as the magnitude of the difference between the confirmed voltage value and the specified target voltage value increases.

[0011] The above buck-boost converter circuit can increase the feedback voltage signal and output it when the duty cycle increases.

[0012] The above negative feedback circuit can provide the feedback voltage signal to the light-emitting part based on the current flowing through the MOSFET element.

[0013] The above MOSFET element is a PMOS element, and the second operational amplifier can apply the feedback voltage signal to the drain terminal of the PMOS element.

[0014] An optical feedback communication method of a battery management system according to one embodiment may include: a step of generating a voltage based on light having communication information received from an external battery management system; a step of checking the voltage value of the voltage generated at the light receiving unit based on the intensity of light received from the external battery management system; a step of adjusting the intensity of light transmitted from the light emitting unit based on the checked voltage value; and a step of transmitting light having communication information to the external battery management system.

[0015] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0016] According to the optical feedback communication method of the present disclosure, even if degradation of communication performance over time between the battery management system and the external battery management system is detected, the intensity of light used for communication between the battery management system and the external battery management system can be maintained at a constant level and the communication state can be maintained smoothly according to the optical feedback communication method to which a negative feedback method is applied.

[0017] The effects according to the various embodiments of the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description in the claims. Brief explanation of the drawing

[0018] The following drawings attached to this specification illustrate examples of various embodiments of the present disclosure and serve to further enhance understanding of the technical concept of the various embodiments of the present disclosure together with the detailed description of the invention set forth below; therefore, the various embodiments of the present disclosure should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a diagram illustrating the concept of a system for performing an optical feedback communication method between battery management systems according to one embodiment. FIG. 2 is a block diagram illustrating the structure of a battery management system that performs optical feedback wireless communication according to one embodiment. FIGS. 3a and FIGS. 3b are drawings for generally explaining the optical feedback process of a battery management system and an external battery management system according to one embodiment, respectively. FIGS. 4a and 4b are drawings for explaining the control unit of a battery management system according to one embodiment. FIG. 5 is a flowchart illustrating the operation of a battery management system that performs optical feedback wireless communication according to one embodiment. FIG. 6 is a block diagram showing the hardware configuration of a control unit included in a battery management system according to one embodiment. In parts of the attached drawings, corresponding components are given the same reference numerals. Those skilled in the art understand that the drawings are intended to illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to aid in understanding various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated compared to others. Additionally, elements of known technology that are useful or essential in commercially viable embodiments may often be omitted so as not to hinder the spirit of the various embodiments of the present disclosure. Specific details for implementing the invention

[0019] The terms used in the embodiments have been selected to be as widely used as possible, taking into account their functions in the present disclosure; however, these may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant explanatory section. Therefore, terms used in the present disclosure should be defined not merely by their names, but based on their meanings and the overall content of the present disclosure.

[0020] When a part of a specification is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0021] The expression "at least one of a, b, and c" described throughout the specification may include 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c', or 'a, b, and c all'.

[0022] The "terminal" mentioned below may be implemented as a computer or portable terminal capable of connecting to a server or other terminal via a network. Here, the computer includes, for example, a notebook, desktop, or laptop equipped with a web browser, and the portable terminal may include, for example, a wireless communication device that ensures portability and mobility, and may include all types of handheld-based wireless communication devices such as communication-based terminals like IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), and LTE (Long Term Evolution), smartphones, tablet PCs, etc.

[0023] Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0024] A Battery Management System (BMS) can be installed, for example, at the battery pack, battery module, and battery cell levels. These BMSs manage the battery pack, battery module, and battery cell to ensure stable operation through mutual communication.

[0025] Among communication methods between battery management systems, wireless communication offers advantages not only in terms of communication quality but also in aspects such as system simplification. In such wireless communication between battery management systems, an optical communication method using a light-emitting diode (LED) as the light-emitting element and a photodiode as the light-receiving element can be utilized, for example. While optical communication methods using light-emitting and light-receiving elements have many advantages, communication quality can degrade due to the aging of these elements or a decrease in light transmission power caused by dust and condensation. For instance, when communication performance decreases due to performance degradation of the photodiode, there was a problem in that it was difficult to detect such performance reduction within the battery management system and maintain communication performance.

[0026] Various embodiments of the present disclosure provide a battery management system and a communication method that can maintain constant communication quality even when the light transmission power is degraded due to device aging, dust, or condensation by utilizing optical feedback.

[0027] Embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0028] FIG. 1 is a diagram illustrating the concept of a system for performing an optical feedback communication method between battery management systems according to one embodiment.

[0029] Referring to FIG. 1, a system (101) performing an optical feedback communication method according to one embodiment may include a battery management system (100) that performs optical feedback communication control and an external battery management system (200) that communicates with the battery management system (100).

[0030] The external battery management system (200) referred to herein refers to a battery management system that is in a communication relationship with a battery management system (100) that performs optical feedback communication control of various embodiments of the present disclosure regardless of physical location. For example, it is assumed that there is communication between a BMS of a battery pack and a BMS of a specific battery module included in the pack, and the BMS of the battery pack can be assumed to be the battery management system (100) and the BMS of the specific battery module can be assumed to be the external battery management system (200).

[0031] Various embodiments of the present disclosure are intended to maintain the communication performance of a battery management system (100) and an external battery management system (200) through optical feedback. For example, the battery management system (100) of various embodiments of the present disclosure proposes a method to maintain communication performance by increasing the light intensity at the light-emitting unit (130) after receiving light transmitted through the light-emitting unit (230) of the external battery management system (200) at the light-receiving unit (110) of the battery management system (100), even if the light intensity received at the light-receiving unit (210) of the external battery management system (200) decreases due to the accumulated use of the light-emitting unit (130) of the battery management system (100). Through this, various embodiments of the present disclosure can maintain communication performance between the battery management system (100) and the external battery management system (200) through a negative feedback method, even if dust accumulates on each light-emitting part (130; 230) and light-receiving part (110; 210) as the communication period between the battery management systems increases due to the use of an optical feedback control method.

[0032] In the example described above, a case was assumed in which the light intensity decreases due to accumulated use of the light-emitting part (130) of the battery management system (100), but various embodiments of the present disclosure are not limited thereto, and, for example, can be similarly applied to a case in which the light intensity decreases due to accumulated use of the light-emitting part (230) of the external battery management system (200).

[0033] FIG. 2 is a block diagram illustrating the structure of a battery management system that performs optical feedback wireless communication according to one embodiment.

[0034] Referring to FIG. 2, a battery management system (100) according to one embodiment may include a light receiving unit (110) that generates a corresponding voltage based on light having communication information received from an external battery management system (200), a light emitting unit (130) that transmits light having communication information to the external battery management system (200), and a control unit (120). Only the components related to this embodiment are shown in the battery management system (100) illustrated in FIG. 2. Therefore, it can be understood by those skilled in the art related to this embodiment that other general components may be included in addition to the components illustrated in FIG. 2.

[0035] In one embodiment, the light receiving unit (110) of the battery management system (100) receives a light signal (light) transmitted from the light emitting unit (230) of the external battery management system (200) and can generate a voltage based on the received light. According to one embodiment, the light receiving unit (110) of the battery management system (100) may include one or more photodiodes corresponding to semiconductor diodes having a function such as a photodetector, and the photodiodes included in the light receiving unit (110) have a PN junction or PIN structure, so that when light with sufficient photon energy is incident on the photodiode, mobile electrons and positive charge holes are generated, and a photocurrent can be generated through the activity of electrons. When the generated current flows through a resistor, it can generate a voltage corresponding to the intensity of the light. Meanwhile, in this disclosure, light signal and light are used interchangeably with the same meaning.

[0036] In one embodiment, the control unit (120) may be configured to check (e.g., sense) the voltage value of the voltage generated in the light receiving unit (110) in correspondence with the light signal transmitted from the external battery management system (200) based on the light intensity received from the external battery management system (200), and to adjust the light intensity transmitted from the light emitting unit (130) to the external battery management system (200) based on the checked voltage value. For example, the control unit (120) of the battery management system (100) may control the light intensity transmitted from the light emitting unit (130) to the external battery management system (200) to increase when the light intensity received from the external battery management system (200) decreases. For example, the control unit (120) of the battery management system (100) can check the voltage value of the voltage generated by the light receiving unit (110) based on the light intensity received from the external battery management system (200), and can adjust the light intensity transmitted from the light emitting unit (130) to the external battery management system (200) so that the voltage value corresponding to the light intensity received from the external battery management system (200) becomes the same as the designated target voltage value. At this time, the designated target voltage value may be determined based on the power consumption for communication between the battery management system (100) and the external battery management system (200), according to one embodiment, or may be determined based on the minimum power consumption for maintaining wireless communication between the battery management system (100) and the external battery management system (200).

[0037] In one embodiment, the light-emitting unit (130) of the battery management system (100) can transmit light having communication information to an external battery management system (200). The light-emitting unit (130) of the battery management system (100) may include one or more photodiodes corresponding to semiconductor diodes having a function such as a photodetector, similar to the light-receiving unit (110) described above, and can transmit light having a light intensity suitable for performing optical feedback to the external battery management system (200) according to control from the control unit (120) of the battery management system (100).

[0039] FIGS. 3a and 3b are drawings for generally explaining the optical feedback process of a battery management system (100) and an external battery management system (200) according to one embodiment.

[0040] Referring to FIG. 3a, when the battery management system (100) and the external battery management system (200) according to one embodiment exchange signals with each other, the entire optical feedback process within the battery management system (100) can be verified.

[0041] First, the control unit (120) of the battery management system (100) can generate a required target voltage value (411) based on the communication power consumption used for communication with the external battery management system (200), and compare the target voltage value (411) with a voltage value (412) confirmed based on the light received through the light receiving unit (110) of the battery management system (100) and transmit it to a negative feedback circuit (450) within the control unit (120). The negative feedback circuit (450) can appropriately change the intensity of light transmitted from the light-emitting unit (130) of the battery management system (100) to the external battery management system (200) through a current (470) that reflects a feedback voltage signal generated according to the comparison result between the target voltage value (411) set by the control unit (120) based on communication power consumption and the voltage value (412) confirmed based on the light received through the light-receiving unit (110). As a result of this negative feedback action, the voltage value (411) of the voltage generated based on the light received by the light-receiving unit (110) of the battery management system (100) from the external battery management system (200) can be controlled to be equal to the target voltage value (412).

[0042] Through such negative feedback, the battery management system (100) can ensure that the confirmed voltage value (411) and the target voltage value (412) remain the same even when the battery management system (100) detects that the voltage value (412) confirmed through the light receiving unit (110) of the battery management system (100) has decreased due to a weakening of the wireless communication signal between the battery management system (100) and the external battery management system (200). The operations performed by each component in the aforementioned optical feedback process will be explained individually below.

[0043] FIG. 3b is a diagram for explaining the overall process inside the external battery management system (200) during the process in which the battery management system (100) receives light from the external battery management system (200) according to one embodiment.

[0044] Referring to FIG. 3b, the photodiode (310) included in the light receiving unit (210) of the external battery management system (200) can receive light containing communication information from the light emitting unit (130) of the battery management system (100). If dust accumulates on the photodiode within the light emitting unit (130) of the battery management system (100) or if dust accumulates on the photodiode (310) included in the light receiving unit (210) of the external battery management system (200), the intensity of the light received from the light receiving unit (210) of the external battery management system (200) decreases, and the current (315) flowing through the photodiode (310) of the light receiving unit (210) driven by the driving voltage (VDD) (330) may decrease. As the current (315) flowing through the photodiode (310) of the light receiving unit (210) of the external battery management system (200) decreases, the voltage drop caused by the light receiving unit resistance (320) decreases, and the light receiving unit voltage (325) may decrease. The decrease in the light receiving unit voltage (325) of the external battery management system (200) may be transmitted to the light emitting unit (230) connected to the light receiving unit (210) of the external battery management system (200), and through this, the intensity of light having communication information transmitted from the light emitting unit (230) of the external battery management system (200) and received by the light receiving unit (110) of the battery management system (100) may decrease, and the voltage generated by the light receiving unit (110) of the battery management system (100) may also decrease. Through this, the control unit (120) of the battery management system (100) detects that the intensity of light used for communication between the battery management system (100) and the external battery management system (200) has weakened, and can control the light of an appropriate intensity to be transmitted to the external battery management system (200) through the light-emitting unit (130) of the battery management system (100) through appropriate correction.

[0046] FIGS. 4a and FIGS. 4b are drawings for explaining a control unit (120) of a battery management system (100) according to one embodiment.

[0047] Referring to FIG. 4a, a control unit (120) according to one embodiment can check (detect) the voltage value of the voltage generated by the light receiving unit (110) based on the light intensity received from the external battery management system (200). According to one embodiment, the control unit (120) of the battery management system (100) checks the voltage value of the voltage generated corresponding to the light intensity received from the external battery management system (200), and then outputs a duty voltage signal by comparing the checked voltage value (412) with a designated target voltage value (411); a first operational amplifier (410); a pulse width modulation (PWM) logic circuit (420) that determines the duty ratio for the duty voltage signal, and a gate driver circuit (430) connected to the PWM logic circuit (420) and controlling the duty ratio. It may include a buck boost converter circuit (440) connected to a gate driver circuit (430) and outputting a feedback voltage signal (446) based on a driving voltage (445) and a duty cycle.

[0048] A first operational amplifier (410) included in a control unit (120) of a battery management system (100) according to one embodiment can output a duty voltage signal to be input to a PWM logic circuit (420) by inputting a voltage value (412) confirmed by the control unit (120) and a designated target voltage value (411). For example, the first operational amplifier (410) can output a duty voltage signal that increases as the magnitude of the difference between the confirmed voltage value (412) and the designated target voltage value (411) increases.

[0049] A PWM logic circuit (420) included in the control unit (120) of a battery management system (100) according to one embodiment can determine the duty ratio of a duty voltage signal by modulating the pulse width of a duty voltage signal received from a first operational amplifier (410), and transmit the determined duty ratio to a gate driver circuit (430).

[0050] A gate driver circuit (430) included in the control unit (120) of a battery management system (100) according to one embodiment can control the duty ratio determined through a PWM logic circuit (420). For example, the gate driver circuit (430) can increase the duty ratio based on the duty voltage signal when the duty voltage signal increases.

[0051] A buck-boost converter circuit (440) included in the control unit (120) of a battery management system (100) according to one embodiment receives a duty cycle from a gate driver circuit (430) and can output a feedback voltage signal (446) based on a driving voltage (445) and a duty cycle. For example, the buck-boost converter circuit (440) can increase and output the feedback voltage signal (446) when the duty cycle of the signal received from the gate driver circuit (430) increases. By such operation, the buck-boost converter circuit (44) according to one embodiment of various embodiments of the present disclosure can output a variable feedback voltage signal (446).

[0052] In one embodiment, when the intensity of light having communication information received from an external battery management system (200) decreases, the voltage generated by the light receiving unit (110) of the battery management system (100) decreases, and the duty voltage signal generated by the first operational amplifier (410) may increase. Accordingly, when the duty ratio determined through the PWM logic circuit (420) connected to the first operational amplifier (410) increases, the buck-boost converter circuit (440) receives the increased duty ratio through the gate driver circuit (430) connected to the PWM logic circuit (420), and the feedback voltage signal (446), which is the output value of the buck-boost converter circuit (440) driven by the driving voltage (445) according to the increase in the duty ratio, may increase.

[0054] Referring to FIG. 4b, a control unit (120) of a battery management system (100) according to one embodiment may include a negative feedback circuit (450) comprising a second operational amplifier (451) and a MOSFET element (452) for providing a previously generated feedback voltage signal (446) to a light-emitting unit (130). For example, the negative feedback circuit (450) may provide the feedback voltage signal (446) to the light-emitting unit (130) based on the current (470) flowing through the MOSFET element (452). Meanwhile, although not illustrated, it is assumed that a power source (VDD) is connected to the other end of the light-emitting unit (130) connected to the MOSFET element (452).

[0055] For example, as previously described in FIG. 4a, when the feedback voltage signal (446), which is the output value of the buck-boost converter circuit (440), increases, the current (470) flowing from the power source (VDD) to the MOSFET element (452) and the light-emitting resistor (460) can increase according to the increase in the feedback voltage signal (446). In this way, the negative feedback circuit (450) included in the control unit (120) of the battery management system (100) can increase the intensity of light transmitted from the light-emitting unit (130) to the external battery management system (200) through the current (470) reflecting the increased feedback voltage signal (446). At this time, the MOSFET element (452) may be a PMOS element according to one embodiment, and the second operational amplifier (451) may apply a feedback voltage signal (446) to the drain terminal of the PMOS element, but the embodiment of the negative feedback circuit (450) according to the present disclosure is not limited to the specific case mentioned.

[0057] FIG. 5 is a flowchart illustrating the operation of a battery management system that performs optical feedback wireless communication according to one embodiment.

[0058] Referring to FIG. 5, in step (510), a battery management system (100) according to one embodiment can first generate a voltage based on light having communication information transmitted by the external battery management system (100) in response to light transmitted from the battery management system (100) to the external battery management system (200). For example, the battery management system (100) can receive light having communication information from the external battery management system (200) through the light receiving unit (110) described in FIG. 3a and FIG. 3b, and generate a voltage based on the light having the received communication information.

[0059] In step (520), the control unit (120) of the battery management system (100) according to one embodiment can check the voltage value generated by the light receiving unit (110) in correspondence with the voltage value of the external battery management system (200) based on the intensity of light received from the external battery management system (200). For example, the battery management system (100) compares the previously generated voltage value with a designated target voltage value as described in FIGS. 3a and 3b, and if the difference between the two values ​​is greater than a predetermined specific value (for example, if the generated voltage value is smaller than a predetermined specific value by a certain limit), it determines that the intensity of light having communication information received from the external battery management system (200) through the light receiving unit (110) has weakened, and can confirm that the voltage value of the external battery management system (200) has decreased in correspondence.

[0060] In step (530), the control unit (120) of the battery management system (100) according to one embodiment can adjust the intensity of light transmitted from the light-emitting unit (130) of the battery management system (100) based on a verified voltage value. For example, the battery management system (100) can adjust the intensity of light transmitted from the light-emitting unit (130) of the battery management system (100) to the external battery management system (200) through the first operational amplifier (410), PWM logic circuit (420), gate driver circuit (430), buck-boost converter circuit (440), and negative feedback circuit (450) included in the control unit (120) as described in FIG. 4a and FIG. 4b. For example, if the verified voltage value is lowered, the battery management system (100) can adjust the intensity of light transmitted from the light-emitting unit (130) to the external battery management system (200) to increase through the control unit (120). According to one embodiment, the control unit (120) can generate a lookup table in advance that corresponds to the light intensity transmitted to the external battery management system (200) according to the degree of reduction of the confirmed voltage value, store it in a memory element, and then use it to generate a voltage signal capable of generating the required light intensity.

[0061] In step (540), the battery management system (100) can transmit light having communication information to an external battery management system (200). For example, the battery management system (100) can transmit light with an intensity controlled through the control unit (120) to the external battery management system (200).

[0062] In this way, through the optical feedback process, even when the light transmission power of the light receiving part (110) and the light emitting part (130) of the battery management system (100) and the light receiving part (210) and the light emitting part (230) of the external battery management system (200) is reduced due to aging, dust, or condensation, the communication quality can be maintained at a constant level.

[0063] FIG. 6 is a block diagram showing a hardware configuration for implementing a control unit included in a battery management system (100) according to the present invention.

[0064] A control unit (120) according to one embodiment disclosed in this document may include an MCU (122), a memory (124), a communication I / F (126), and an input / output I / F (128). The MCU (122) is a Micro Controller Unit and is a processor that executes various programs stored in the memory (124), processes various data used in these programs, and performs the functions of the control unit (120).

[0065] The memory (124) can store operation data of various programs regarding the operation of a battery management system for the operation of the control unit (120). Multiple such memories (124) may be provided as needed. The memory (124) may be a volatile memory or a non-volatile memory. As a volatile memory, RAM, DRAM, SRAM, etc. may be used for the memory (124). As a non-volatile memory, ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. may be used for the memory (124). The examples of the memories (124) listed above are merely examples and are not limited to these.

[0066] The communication I / F (126) is configured to transmit and receive various data to and from a server and may be various devices capable of supporting wired or wireless communication. For example, programs for the operation of the control unit (120) or various data may be transmitted or received via wired or wireless from an external server provided separately through the communication I / F (126). The input / output I / F (128) may provide an interface that enables data transmission and reception by connecting an input device (not shown), such as a keyboard, mouse, or touch panel, and an output device (not shown), such as a display, to the MCU (122).

[0067] The present embodiment may be represented by functional block configurations and various processing steps. These functional blocks may be implemented by various numbers of hardware and / or software configurations that execute specific functions. For example, the embodiment may employ integrated circuit configurations such as memory, processing, logic, look-up tables, etc., which can execute various functions by the control of one or more microprocessors or other control devices. Similar to how components may be implemented as software programming or software elements, the present embodiment may be implemented in programming or scripting languages ​​such as C, C++, Java, assembler, etc., including various algorithms implemented as combinations of data structures, processes, routines, or other programming configurations. Functional aspects may be implemented as algorithms executed on one or more processors. Additionally, the present embodiment may employ prior art for electronic configuration, signal processing, and / or data processing. Terms such as "mechanism," "element," "means," and "configuration" may be used broadly and are not limited to mechanical and physical configurations. The above terms may include the meaning of a series of software processes (routines) in conjunction with processors, etc.

[0068] Although the foregoing has been described with reference to the embodiments of the present disclosure, a person skilled in the art or having ordinary knowledge in the art will understand that various modifications and changes can be made to the various embodiments of the present disclosure without departing from the technical scope of the various embodiments of the present disclosure as set forth in the claims below. Accordingly, the technical scope of the various embodiments of the present disclosure should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

Claims

Claim 1 A battery management system comprises: a light receiving unit that receives light having communication information from an external battery management system and generates a voltage corresponding to the intensity of the received light; a light emitting unit that transmits light having communication information to the external battery management system; and a control unit, wherein the control unit is configured to check the voltage value of the voltage generated by the light receiving unit based on the intensity of the light received from the external battery management system, and to adjust the intensity of the light transmitted by the light emitting unit based on the checked voltage value and a designated target voltage, and wherein the control unit comprises: a first operational amplifier that outputs a duty voltage signal by comparing the checked voltage value and the designated target voltage value; a pulse width modulation (PWM) logic circuit that determines a duty ratio for the duty voltage signal; a gate driver circuit connected to the PWM logic circuit and controlling the duty ratio; and a buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on a driving voltage and the duty ratio. A battery management system comprising a negative feedback circuit including a second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light-emitting unit. Claim 2 A battery management system according to claim 1, wherein the control unit controls the intensity of light transmitted from the light-emitting unit to the external battery management system to increase when the intensity of light received from the external battery management system decreases. Claim 3 A battery management system according to claim 1, wherein the control unit adjusts the intensity of light transmitted from the light-emitting unit to the external battery management system so that the confirmed voltage value and the designated target voltage value become the same. Claim 4 In paragraph 3, the battery management system, wherein the specified target voltage value is determined based on the power consumption of communication between the battery management system and the external battery management system. Claim 5 delete Claim 6 A battery management system according to claim 1, wherein the first operational amplifier increases and outputs the duty voltage signal as the magnitude of the difference between the confirmed voltage value and the specified target voltage value increases. Claim 7 In claim 1, the buck-boost converter circuit increases and outputs the feedback voltage signal when the duty cycle increases, in a battery management system. Claim 8 A battery management system according to claim 1, wherein the negative feedback circuit provides the feedback voltage signal to the light-emitting part based on the current flowing through the MOSFET element. Claim 9 A battery management system according to claim 1, wherein the MOSFET element is a PMOS element, and the second operational amplifier applies the feedback voltage signal to the drain terminal of the PMOS element. Claim 10 An optical feedback communication method of a battery management system performed by a battery management system including a control unit, comprising: a step of generating a voltage corresponding to the intensity of light received based on light having communication information from an external battery management system; a step of verifying the generated voltage value; a step of adjusting the intensity of light transmitted from a light emitting unit based on the verified voltage value and a designated target voltage value; and a step of transmitting light having communication information to the external battery management system, wherein the control unit includes: a first operational amplifier that outputs a duty voltage signal by comparing the verified voltage value and the designated target voltage value; a pulse width modulation (PWM) logic circuit that determines a duty ratio for the duty voltage signal; a gate driver circuit connected to the PWM logic circuit and controlling the duty ratio; a buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on a driving voltage and the duty ratio; and a negative feedback circuit including a second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light emitting unit. Claim 11 A battery management system comprises: a light receiving unit that receives light having communication information from an external battery management system and generates a voltage corresponding to the intensity of the received light; a light emitting unit that transmits light having communication information to the external battery management system; and a control unit. The control unit includes an optical feedback circuit configured to check the voltage value of the voltage generated by the light receiving unit in accordance with the intensity of the light received from the external battery management system, and to adjust the intensity of the light transmitted by the light emitting unit based on the checked voltage value and a designated target voltage value. The optical feedback circuit includes a converter circuit configured to generate a variable voltage signal for a light signal to be transmitted from the light emitting unit to the external battery management system based on the checked voltage value and the designated target voltage value. The optical feedback circuit includes: a first operational amplifier that outputs a duty voltage signal by comparing the checked voltage value and the designated target voltage value; a pulse width modulation (PWM) logic circuit that determines a duty ratio for the duty voltage signal; and a gate driver circuit connected to the PWM logic circuit and controlling the duty ratio. A battery management system further comprising a second operational amplifier and a MOSFET element for providing a feedback voltage signal to the light-emitting unit. Claim 12 delete

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