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KR-102962520-B1 - Wireless Battery Management System and Manager Node therefor and Method for operating Channel

KR102962520B1KR 102962520 B1KR102962520 B1KR 102962520B1KR-102962520-B1

Abstract

The present invention relates to a wireless battery management system for operating channels to stably support wireless communication in a wireless battery management system, a manager node for the same, and a channel operation method. A wireless battery management system according to an embodiment of the present invention comprises: a manager node that configures a short-range wireless network using at least one of a first channel and a second channel, and when another network using the same communication channel and modulation method is detected compared with the short-range wireless network, changes the first channel to a third channel and changes the second channel to a fourth channel; and a monitor node that transmits battery data to the manager node using at least one of the first channel and the second channel, and when channel change data including identification information of the third channel and identification information of the fourth channel is broadcast from the manager node, transmits the battery data to the manager node using at least one of the third channel and the fourth channel.

Inventors

  • 선용주
  • 이흥렬
  • 최승준
  • 김덕수
  • 이희진
  • 김종찬

Assignees

  • 주식회사 엘엑스세미콘

Dates

Publication Date
20260508
Application Date
20200810
Priority Date
20190830

Claims (19)

  1. A manager node that configures a short-range wireless network using at least one of a first channel and a second channel, and if another network using the same communication channel and modulation method is detected by comparison with the short-range wireless network, changes the first channel to a third channel and changes the second channel to a fourth channel; and A monitor node that transmits battery data to the manager node using at least one of the first channel and the second channel, and transmits the battery data to the manager node using at least one of the third channel and the fourth channel when channel change data including identification information of the third channel and identification information of the fourth channel is broadcast from the manager node. The above manager node is, If no other network using the same communication channel and modulation method is detected compared with the above short-range wireless network, the degradation level of the first channel is calculated, and if the degradation level deviates from the normal range, the reserve main channel and reserve sub channel selected through channel scanning are verified, the first channel is changed to the reserve main channel and the second channel is changed to the reserve sub channel. The above monitor node is, A wireless battery management system that transmits battery data to the manager node using at least one of the reserve main channel and the reserve sub channel when channel change data including identification information of the reserve main channel and identification information of the reserve sub channel is broadcast from the manager node.
  2. In Article 1, The above manager node is, A wireless battery management system that determines that another network using the same communication channel and modulation method has been detected when a data frame of the other network using the same modulation method as the short-range wireless network is detected in the first channel and the energy level of the frequency of the second channel exceeds a threshold value.
  3. In Article 2, The above manager node, when a data frame of the other network is detected in the first channel and the energy level of the frequency of the second channel is below a threshold value, checks the reserve main channel and reserve sub channel selected through channel scanning, changes the first channel to the reserve main channel, and changes the second channel to the reserve sub channel. A wireless battery management system in which the above-mentioned monitor node transmits battery data to the above-mentioned manager node using at least one of the above-mentioned main channel and the above-mentioned sub-channel when channel change data including identification information of the above-mentioned main channel and identification information of the above-mentioned sub-channel is broadcast from the above-mentioned manager node.
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  5. In Article 2, The above manager node is, A wireless battery management system that detects the energy level of the frequency of the first channel and data frames of other networks generated in the first channel, checks the number of times at least one of the ACK from the monitor node and battery data has not been received, and calculates the degradation degree of the first channel by applying weights to each of the detected energy level, the detection result value for the data frames of other networks, and the number of times they have not been received.
  6. In Article 2 or Article 3, The above manager node is, A wireless battery management system that searches channels other than the first channel and the second channel, and among the searched channels, selects the channel with the lowest frequency energy level and no data frame of another network is detected as the reserve main channel.
  7. In Article 6, The above manager node is, A wireless battery management system that selects as the reserve sub-channel a channel among channels separated from the reserve main channel by a predetermined separation frequency in which a data frame of another network is not detected and the frequency energy level is minimum.
  8. In Article 1, The above manager node is, A wireless battery management system that selects the third channel and the fourth channel in a random manner from among available channels.
  9. In Article 1, The above monitor node is, Before receiving the channel change data, the battery data is transmitted to the manager node using the first channel, and if the transmission of the battery data using the first channel fails, the battery data is transmitted to the manager node using the second channel, and A wireless battery management system that, after receiving the channel change data, transmits the battery data to the manager node using the third channel, and if the transmission of the battery data using the third channel fails, transmits the battery data to the manager node using the fourth channel.
  10. A first wireless communication unit in which a communication channel is established as a first channel; A second wireless communication unit in which a communication channel is established as a second channel; and A control unit that forms a near-field wireless network with a monitor node using at least one of the first channel and the second channel to receive battery data from the monitor node, and if another network using the same communication channel and modulation method is detected by comparing with the near-field wireless network, changes the communication channel of the first wireless communication unit to the third channel and changes the communication channel of the second wireless communication unit to the fourth channel. A manager node that, when no other network using the same communication channel and modulation method is detected compared with the above-mentioned short-range wireless network, calculates the degradation level of the first channel, and if the degradation level deviates from the normal range, checks the reserve main channel and reserve sub channel selected through channel scanning, changes the first channel to the reserve main channel, and changes the second channel to the reserve sub channel.
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Description

Wireless Battery Management System and Manager Node therefor and Method for operating Channel The present invention relates to a wireless battery management system, and more specifically, to a wireless battery management system that operates a channel to stably support wireless communication in a wireless battery management system, a manager node for the same, and a channel operation method. With the rapid increase in demand for portable electronic products such as laptops, video cameras, and mobile phones, and the full-scale development of electric vehicles, energy storage batteries, robots, and satellites, research on high-performance batteries capable of repeated charging and discharging is actively underway. The smallest unit of a battery can be referred to as a battery cell, and multiple battery cells connected in series can form a battery module. Additionally, multiple battery modules can be connected in series or in parallel to form a battery pack. Battery packs installed in electric vehicles and the like generally include multiple battery modules connected in series or parallel. Such battery packs include a Battery Management System that monitors the status of each battery module included therein and executes control operations corresponding to the monitored status. The above-described battery management system is equipped with a controller for acquiring and analyzing battery data. However, since each battery module included in a battery pack contains multiple battery cells, there are limitations to monitoring the status of all battery cells in the pack using a single controller. Accordingly, in order to distribute the load on the controller and monitor the status of the entire battery pack quickly and accurately, a method has recently been utilized in which a controller is installed for each predetermined number of battery modules in the battery pack, one of the controllers is set as the master, and the remaining controllers are set as slaves. A slave controller, installed for each predetermined number of battery modules, is connected to a master controller via a wired communication network such as a CAN (Control Area Network), collects battery data of the battery modules it is responsible for, and transmits the battery data to the master controller. Meanwhile, in order to prevent spatial inefficiency that occurs when building a CAN for communication between a master controller and a slave controller, a technology has emerged that establishes a short-range wireless channel between a master controller and a slave controller and performs short-range wireless communication between the master controller and the slave controller through the wireless channel. However, different wireless battery management systems may use the same communication channel, which can lead to interference and wireless signal collisions between them. When wireless battery management systems using the same channel are located adjacent to each other, a situation may arise where the master controller fails to acquire battery data from the slave controller or control the slave controller in a timely manner, which acts as a problem that degrades the quality of the entire battery pack. FIG. 1 is a drawing showing a wireless battery management system according to one embodiment of the present invention. FIG. 2 is a drawing illustrating a data frame according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of a manager node according to one embodiment of the present invention. FIG. 4 is a flowchart illustrating a method for a manager node to acquire battery data according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating a method for a manager node to select a reserve channel according to an embodiment of the present invention. FIG. 6 is a flowchart illustrating a method of operating a channel in a wireless battery management system according to one embodiment of the present invention. Throughout the specification, identical reference numbers denote substantially identical components. In the following description, detailed descriptions of components and functions known in the art may be omitted if they are not related to the core components of the invention. The meanings of the terms described in this specification should be understood as follows. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. The shapes, sizes, ratios, angles, numbers,