KR-20260063137-A - BATTERY MANAGEMENT SYSTEM, BATTERY APPARATUS AND BALANCING METHOD

KR20260063137AKR 20260063137 AKR20260063137 AKR 20260063137AKR-20260063137-A

Abstract

A battery management system includes a plurality of cell balancing circuits each connected to a plurality of battery cells, and a control circuit for controlling the plurality of cell balancing circuits. Each balancing circuit includes a first resistor and a first switch connected in series between the positive and negative electrodes of a corresponding battery cell among the plurality of battery cells, and a second resistor and a second switch connected in series between the positive and negative electrodes of the corresponding battery cell.

Inventors

김태훈

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (15)

As a battery management system connected to multiple battery cells, A plurality of cell balancing circuits each connected to the plurality of battery cells, and It includes a control circuit that controls the plurality of cell balancing circuits above, and Each balancing circuit is A first resistor and a first switch connected in series between the positive and negative electrodes of a corresponding battery cell among the plurality of battery cells, and A second resistor and a second switch connected in series between the positive and negative electrodes of the corresponding battery cell. Battery management system.
In paragraph 1, A battery management system in which the pair of the first resistor and the first switch and the pair of the second resistor and the second switch are connected in parallel to the corresponding battery cell.
In paragraph 1, The above control circuit includes a battery monitoring integrated circuit that monitors the plurality of battery cells, and The battery monitoring integrated circuit has at least one general purpose input/output (GPIO) pin, and controls the second switch of the plurality of cell balancing circuits with the at least one GPIO pin. Battery management system.
In paragraph 1, A battery management system in which, when balancing a target battery cell among the plurality of battery cells, the control circuit turns on the first switch and the second switch of the target cell balancing circuit connected to the target battery cell among the plurality of cell balancing circuits.
In Paragraph 4, The above control circuit includes a battery monitoring integrated circuit that monitors the plurality of battery cells, and The battery monitoring integrated circuit has a plurality of GPIO pins corresponding one-to-one to the plurality of cell balancing circuits, and controls the second switch of the target cell balancing circuit using a GPIO pin among the plurality of GPIO pins that corresponds to the target cell balancing circuit. Battery management system.
In Paragraph 4, The above control circuit includes a battery monitoring integrated circuit that monitors the plurality of battery cells, and The battery monitoring integrated circuit has a first GPIO pin corresponding to an odd-numbered cell balancing circuit among the plurality of cell balancing circuits and a second GPIO pin corresponding to an even-numbered cell balancing circuit among the plurality of cell balancing circuits, and controls the second switch of the target cell balancing circuit using the first GPIO pin or the second GPIO pin. Battery management system.
In Paragraph 4, The above control circuit is A battery monitoring integrated circuit that monitors the plurality of battery cells and has a plurality of GPIO pins, and It includes a demultiplexer having a plurality of output terminals corresponding to each of the plurality of cell balancing circuits, and outputting a signal of a predetermined level to an output terminal corresponding to a combination of signals of the plurality of GPIO pins among the plurality of output terminals. The battery monitoring integrated circuit controls the second switch of the target cell balancing circuit by a combination of signals from the plurality of GPIO pins. Battery management system.
Multiple battery cells, and It includes a plurality of cell balancing circuits each connected to the plurality of battery cells, and Each balancing circuit is A first resistor and a first switch connected in series between the positive and negative electrodes of a corresponding battery cell among the plurality of battery cells above, forming a first current path, and A second resistor and a second switch connected in series between the positive and negative electrodes of the corresponding battery cell and forming a second current path in parallel with the first current path. Battery device.
In paragraph 8, A battery device in which the pair of the first resistor and the first switch and the pair of the second resistor and the second switch are connected in parallel to the corresponding battery cell.
In paragraph 8, A battery device that, when balancing a target battery cell among the plurality of battery cells, further comprises an integrated circuit that turns on the first switch and the second switch of a target cell balancing circuit connected to the target battery cell among the plurality of cell balancing circuits.
In Paragraph 10, The integrated circuit has at least one general purpose input/output (GPIO) pin, and controls the second switch of the plurality of cell balancing circuits with the at least one GPIO pin. Battery device.
In Paragraph 11, A battery device wherein the at least one GPIO pin comprises a plurality of GPIO pins corresponding one-to-one to the plurality of cell balancing circuits.
In Paragraph 11, A battery device wherein the at least one GPIO pin comprises a first GPIO pin corresponding to an odd-numbered cell balancing circuit among the plurality of cell balancing circuits and a second GPIO pin corresponding to an even-numbered cell balancing circuit among the plurality of cell balancing circuits.
In Paragraph 11, A battery device further comprising a demultiplexer having a plurality of output terminals corresponding to each of the plurality of cell balancing circuits, and outputting a signal of a predetermined level to an output terminal corresponding to a combination of signals of at least one GPIO pin among the plurality of output terminals.
As a method for balancing multiple battery cells, A step of receiving a command instructing an increase in balancing speed, A step of selecting a target battery cell among the plurality of battery cells above, and A step of performing balancing through a first current path in the above target battery cell, and performing balancing through a second current path formed in parallel with the first current path. A balancing method including

Description

Battery Management System, Battery Apparatus and Balancing Method The disclosure relates to a battery management system, a battery device, and a balancing method. Electric or hybrid vehicles are vehicles that generate power by driving a motor primarily using a battery as a power source, and active research is being conducted on them as an alternative capable of solving the pollution and energy problems associated with internal combustion engine vehicles. In addition, batteries are used in various external devices other than vehicles. Multiple battery cells are connected in series inside a battery, and voltage deviations between battery cells can cause over-discharge or over-charge of the battery cells and reduce the lifespan of the battery cells. To mitigate these voltage deviations, a cell balancing circuit is designed within the battery management system. Conventional cell balancing circuits use resistors of a fixed size, so they perform balancing with a constant current determined by the resistor and the battery cell voltage. When fast balancing is required, the balancing speed cannot be controlled with a constant current. FIG. 1 is a block diagram showing a battery device according to some embodiment. FIG. 2 is a drawing showing a battery management system according to a certain embodiment. FIG. 3 is a drawing showing a battery management system according to a certain embodiment. FIG. 4 is a drawing showing a battery management system according to a certain embodiment. FIG. 5 is a diagram illustrating the operation of a demultiplexer of a battery management system according to a certain embodiment. FIG. 6 is a flowchart illustrating a balancing method according to a certain embodiment. Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals. When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to that other component, or that there may be other components in between. On the other hand, when it is stated that a component is "directly connected" to another component, it should be understood that there are no other components in between. Expressions written in the singular in the description below may be interpreted as singular or plural unless explicit expressions such as "one" or "singular" are used. In the flowchart described with reference to the drawings, the order of operations may be changed, multiple operations may be merged or some operations may be divided, and specific operations may not be performed. FIG. 1 is a block diagram showing a battery device according to some embodiment. Referring to FIG. 1, the battery device (100) may include a battery module (110), a battery management system (BMS) (120), and switches (131, 132). It has a structure that can be electrically connected to an external device through a positive link terminal (P+) and a negative link terminal (P-). In some embodiments, when the external device is a load, the battery device (100) can be discharged by operating as a power source that supplies power to the load. When the external device is a charger, the battery device (100) can be charged by receiving external power through the charger. In some embodiments, the external device operating as a load may be, for example, an electronic device, a means of transportation, or an energy storage system (ESS), and the means of transportation may be, for example, a vehicle such as an electric vehicle, a hybrid vehicle, or smart mobility. The battery device (100) may be a battery pack. The battery device (100) may include a battery module (110) and a battery management system (BMS) (120). A battery module (110) may include a plurality of battery cells (not shown). In some embodiments, the plurality of battery cells may be connected in series. In some embodiments, a battery device (100) may include a plurality of battery modules (110). Each of the plurality of battery cells of the battery module (110) may be connected to a battery management system (120) via wiring. Switch (131) may be connected between the positive terminal and the positive link terminal (P+) of the battery module (110), and switch (132) may be connected between the negative terminal and the negative link terminal (P-) of the battery module (110). Switches (131, 132) may be controlled by a battery management system (120) to control the connection between the battery device (100) and an external device. In some embodiments, switches (131, 132) may each include a contactor including a relay. In some e