Battery charging system and battery charging method

Abstract

The present invention relates to a battery charging system and a battery charging method. The battery charging system includes a charger that supplies power, a bypass device that rotates about a central axis and provides a power path for connecting at least one of a first battery and a second battery to both ends of the charger in a battery charging system connected to both ends of each of a plurality of batteries, and a processor that monitors the voltage across each of the first battery and the second battery and controls the rotation direction and rotation angle of the bypass device.

Description

Technical Field

[0001] Cross - reference to related applications This application claims the benefit of priority based on Korean Patent Application No. 10 - 2023 - 0051447 filed on April 19, 2023, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

[0002] This disclosure relates to a battery charging system and a battery charging method.

Background Art

[0003] In the case of a battery charger, since the rated current is an important factor, when providing a large amount of power for rapid charging, it is more efficient to increase the voltage rather than the current. Therefore, even when charging a plurality of batteries, it is more efficient to charge them in series rather than in parallel.

[0004] However, when charging a plurality of batteries connected in series, since the charging speeds of the individual batteries are different, there is a need for a method of bypassing the battery that is first fully charged and continuing to charge the remaining batteries.

Summary of the Invention

Problems to be Solved by the Invention

[0005] It is intended to provide a battery charging system and a battery charging method that can first bypass the electrical connection of a fully charged battery to a charger and continue to charge the remaining batteries when charging a plurality of batteries in series.

Means for Solving the Problems

[0006] A battery charging system according to one feature of the invention includes a charger that supplies power, a bypass device that rotates about a central axis and provides a power path for connecting at least one of a first battery and a second battery to both ends of the charger, and a processor that monitors the voltage at both ends of each of the first battery and the second battery and controls the rotation direction and rotation angle of the bypass device, in a battery charging system connected to both ends of each of a plurality of batteries.

[0007] The bypass device may include a first plate including a plurality of bypass nodes electrically connected to a positive terminal of the charger, a negative terminal of the charger, a negative terminal of the first battery, and a positive terminal of the second battery, respectively, and a second plate including a node connection module that rotates according to a control signal of the processor and electrically connects two nodes indicated by the control signal among the plurality of bypass nodes.

[0008] The positive terminal of the charger may be connected to the positive terminal of the first battery, and the negative terminal of the charger may be connected to the negative terminal of the second battery.

[0009] If the node connection module electrically connects the node connected to the negative terminal of the first battery and the node connected to the positive terminal of the second battery, the charger can supply power to the first battery and the second battery.

[0010] If the node connection module electrically connects the node connected to the negative terminal of the first battery and the node connected to the negative terminal of the charger, the charger can supply power to the first battery.

[0011] If the node connection module electrically connects the node connected to the positive terminal of the second battery and the node connected to the positive terminal of the charger, the charger can supply power to the second battery.

[0012] The processor can compare the voltages across both ends of the first battery and the second battery with a predetermined reference voltage, and control the bypass device so that the battery corresponding to the voltage across both ends that is equal to or higher than the reference voltage among the first battery and the second battery is electrically separated from the positive and negative terminals of the charger.

[0013] A battery charging method according to another feature of the invention includes the steps of receiving a plurality of voltage measurement signals from both ends of a first battery and a second battery respectively, deriving the voltages across both ends of the first battery and the second battery respectively based on the voltage measurement signals, comparing the voltages across both ends of the first battery and the second battery with a predetermined reference voltage to generate a control signal, the bypass device receiving the control signal rotates about a central axis to provide a power path for connecting at least one of the first battery and the second battery to both ends of the charger, and supplying power to the at least one battery through the charger.

[0014] If the bypass device electrically connects a node connected to the negative terminal of the first battery and a node connected to the positive terminal of the second battery, the step of supplying the power can include the step of supplying power to the first battery and the second battery.

[0015] If the bypass device electrically connects a node connected to the negative terminal of the first battery and a node connected to the negative terminal of the charger, the step of supplying the power can include the step of supplying power to the first battery.

[0016] If the bypass device electrically connects a node connected to the positive terminal of the second battery and a node connected to the positive terminal of the charger, the step of supplying the power can include the step of supplying power to the second battery.

Advantages of the Invention

[0017] According to an embodiment of the present invention, when charging a plurality of batteries in series, the battery that is first fully charged can be electrically separated from the charger, and the remaining batteries can be charged, thereby efficiently charging the batteries.

[0018] According to an embodiment of the present invention, when electrically separating a fully charged battery from the charger and electrically connecting the remaining batteries to the charger, instead of providing a large number of switch structures, the same operation can be performed using a rotating body structure.

[0019] According to an embodiment of the present invention, when providing a large number of switch structures for two battery packs, unlike the case where a large number of control signals were required, the bypass structure can be simply controlled with one control signal corresponding to one rotating body structure.

Brief Description of the Drawings

[0020]

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DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. The same or similar reference numerals are assigned to the same or similar components, and redundant descriptions thereof are omitted. The suffixes "module" and / or "section" for the components used in the following description are given or mixed only for the ease of preparing the specification, and do not have meanings or roles that distinguish them from each other by themselves. Further, when it is determined that a specific description of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof is omitted. Also, the accompanying drawings are only for facilitating the understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and it should be understood that all modifications, equivalents or alternatives included in the spirit and technical scope of the present invention are included.

[0022] Terms including ordinal numbers such as "first", "second", etc. can be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

[0023] In this application, terms such as "including" or "having" are intended to specify that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should be understood that they do not preclude in advance the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0024] Among the configurations according to an embodiment, in a configuration that controls other configurations under specific control conditions, a program implemented by a set of instruction words that embody a control algorithm necessary for controlling other configurations can be installed. The control configuration can process input data and stored data by the installed program to generate output data. The control configuration can include a non-volatile memory for storing the program and a memory for storing data.

[0025] FIG. 1 is a block diagram schematically showing a battery charging system according to an embodiment.

[0026] Referring to FIG. 1, the battery charging system 1 can include a processor 100, a charger 120, and a bypass device 200.

[0027] The battery charging system 1 can include a plurality of terminals P1 - P4. The plurality of terminals P1 - P4 can be connected to both ends of each of the plurality of batteries 3001, 3002. Terminal P1 is connected to the positive terminal (+) of battery 3001, terminal P2 is connected to the negative terminal (-) of battery 3001, terminal P3 is connected to the positive terminal (+) of battery 3002, and terminal P4 is connected to the negative terminal (-) of battery 3002.

[0028] In the drawings, the number of the plurality of batteries 3001 and 3002 is shown as two, and the number of the plurality of terminals P1 - P4 is shown as four, but this is for convenience of explanation and the invention is not limited thereto. The battery charging system 1 can include three or more terminals so as to be connected to both ends of two or more batteries.

[0029] The charger 120 is connected to a power source and can charge the capacitor 121 with energy using the power source.

[0030] The bypass device 200 can electrically connect the battery corresponding to the terminal voltage less than a predetermined reference voltage to the charger 120 and electrically separate the battery corresponding to the terminal voltage greater than or equal to the reference voltage from the charger 120 during the charging cycle in which the two batteries 3001 and 3002 are charged.

[0031] The processor 100 can monitor the terminal voltages at both ends of the two batteries 3001 and 3002 respectively and control the rotation direction and rotation angle of the bypass device 200 so that the two batteries 3001 and 3002 are electrically connected or separated from the charger 120 respectively. For example, the processor 100 can determine one of the power paths that connect the two batteries 3001 and 3002 in series depending on whether each of the two batteries 3001 and 3002 is greater than or equal to a predetermined reference voltage, the power path that electrically connects the negative terminal (-) of the battery 3001 to the negative terminal (-) of the capacitor 121, and the power path that electrically connects the positive terminal (+) of the battery 3002 to the positive terminal (+) of the capacitor 121. The processor 100 can generate a control signal CS for controlling the rotation direction and rotation angle of the bypass device 200 so as to correspond to the determined power path.

[0032] Processor 100 can receive voltage indication signals VP1, VN1, VP2, and VN2 from both ends of two batteries 3001 and 3002 respectively. Processor 100 can receive a voltage measurement signal VP1 indicating the positive terminal voltage from the positive terminal (+) of battery 3001. Processor 100 can receive a voltage measurement signal VN1 indicating the negative terminal voltage from the negative terminal (-) of battery 3001. Processor 100 can receive a voltage measurement signal VP2 indicating the positive terminal voltage from the positive terminal (+) of battery 3002. Processor 100 can receive a voltage measurement signal VN2 indicating the negative terminal voltage from the negative terminal (-) of battery 3002.

[0033] Processor 100 can derive the terminal voltages of two batteries 3001 and 3002 respectively based on a plurality of voltage measurement signals VP1, VN1, VP2, and VN2. For example, processor 100 can derive the terminal voltage of battery 3001 based on two voltage measurement signals VP1 and VN1.

[0034] Processor 100 can generate a control signal CS based on the terminal voltages of two batteries 3001 and 3002 respectively. Processor 100 can monitor the terminal voltages of two batteries 3001 and 3002 respectively to check the charge state. By comparing the terminal voltages of two batteries 3001 and 3002 respectively with a predetermined reference voltage, if the terminal voltages of two batteries 3001 and 3002 respectively are equal to or higher than the predetermined reference voltage, processor 100 can determine that the battery corresponding to the excessive terminal voltage is fully charged.

[0035] When charging two batteries 3001 and 3002 in series, the charging speeds of the respective batteries may be different. The processor 100 can generate a control signal CS that instructs the rotation of the bypass device 200 so as not to receive power supply from the charger 120 for the battery (for example, 3001) that is determined to be fully charged first among the two batteries 3001 and 3002, and transmit it to the bypass device 200. The processor 100 can control the bypass device 200 so that the battery corresponding to the terminal voltage that is equal to or higher than the reference voltage among the terminal voltages at both ends of each of the two batteries 3001 and 3002 is electrically separated from the positive terminal (+) and the negative terminal (-) of the charger 120 through the control signal CS. The control signal CS can include a signal that indicates the direction and rotation angle for rotating the bypass device 200 so as to form one of the power paths connecting the two batteries 3001 and 3002 in series, the power path connecting the negative terminal (-) of the battery 3001 and the negative terminal (-) of the capacitor 121, and the power path connecting the positive terminal (+) of the battery 3002 and the positive terminal (+) of the capacitor 121.

[0036] The charger 120 can supply power to at least one of the two batteries 3001 and 3002. The positive terminal (+) and the negative terminal (-) of the capacitor 121 can be connected to the corresponding terminals (for example, P1 and P4) among the plurality of terminals P1 - P4.

[0037] The bypass device 200 can rotate around the central axis 210 at the angle indicated by the control signal CS to provide a power path that connects at least one battery determined by the processor 100 to be charged by the charger 120 to the charger 120. The bypass device 200 can connect the positive terminal (+) and / or the negative terminal (-) of the capacitor 121 to the corresponding terminals among the plurality of terminals P1 - P4. Also, when the number of at least one battery determined by the processor 100 to be charged is 2 or more, the bypass device 200 can connect 2 or more batteries in series.

[0038] The battery charging system 1 can include a plurality of wirings LN1-LN4 indicating a plurality of power paths. The bypass device 200 can include a plurality of terminals P200_1-P200_4 connected to the plurality of wirings LN1-LN4. The wiring LN1 may be arranged along the power path between the positive terminal (+) of the capacitor 121 and the terminal P200_4. The wiring LN2 may be arranged along the power path between the negative terminal (-) of the capacitor 121 and the terminal P200_1. The wiring LN3 may be arranged along the power path between the terminal P2 and the terminal P200_2. The wiring LN4 may be arranged along the power path between the terminal P3 and the terminal P200_3.

[0039] In FIG. 1, the number of each of the plurality of wirings LN1-LN4 and the plurality of terminals P200_1-P200_4 is shown as four, but this is for convenience of explanation and the invention is not limited thereto. The bypass device 200 and the battery charging system 1 can include four or more terminals and be connected to four or more wirings.

[0040] The bypass device 200 can provide a power path connecting between two adjacent terminals (for example, P200_2 and P200_3) among the plurality of terminals P200_1-P200_4 through rotation.

[0041] In the first embodiment, the bypass device 200 can provide a power path connecting between two adjacent terminals P200_2 and P200_3. In the second embodiment, the bypass device 200 can rotate 90 degrees in the clockwise direction based on the first embodiment and provide a power path connecting between two adjacent terminals P200_3 and P200_4. In the third embodiment, the bypass device 200 can rotate 90 degrees in the counterclockwise direction based on the first embodiment and provide a power path connecting between two adjacent terminals P200_1 and P200_2. In the fourth embodiment, the bypass device 200 can rotate 90 degrees in the clockwise direction based on the second embodiment and provide a power path connecting between two adjacent terminals P200_4 and P200_1.

[0042] In the first embodiment, the bypass device 200 can connect two batteries 3001 and 3002 in series to the charger 120. Here, the charger 120 can supply power to the two batteries 3001 and 3002. In the second embodiment, the bypass device 200 can connect the positive terminal (+) of the capacitor 121 to the positive terminal of the battery 3002. Here, the charger 120 can supply power to the battery 3002. In the third embodiment, the bypass device 200 can connect the negative terminal (-) of the capacitor 121 to the negative terminal of the battery 3001. Here, the charger 120 can supply power to the battery 3001. In the fourth embodiment, the bypass device 200 can connect the positive terminal (+) of the capacitor 121 to the negative terminal (-) of the capacitor 121. Here, the charger 120 does not supply power to the two batteries 3001 and 3002.

[0043] FIG. 2 is a detailed configuration diagram showing the detailed configuration of the bypass device of FIG. 1.

[0044] Referring to FIG. 2, the bypass device 200 can include a central axis 210, an upper plate 220, and a lower plate 230. For the convenience of detailed description, the names of the upper plate 220 and the lower plate 230 are used, but this is for the convenience of description and the invention is not limited thereto. In the bypass device 200, the upper plate 220 may be disposed below the lower plate 230.

[0045] The upper plate 220 can include a central portion 221 and a node connection module 223. The node connection module 223 can include a connection portion 2231, a first contact portion 2232a, and a second contact portion 2232b. The first contact portion 2232a and the second contact portion 2232b can be connected to each other through the connection portion 2231. The connection portion 2231 can be realized through a bus bar or the like. The separation distance between the first contact portion 2232a and the second contact portion 2232b may be a predetermined distance d1.

[0046] The lower plate 230 can include a central portion 231 and a plurality of bypass nodes 2321-2324.

[0047] The lower plate 230 includes a plurality of bypass nodes 2321-2324 that are electrically connected to the positive terminal (+) and negative terminal (-) of the charger 120, the negative terminal of the battery 3001, and the positive terminal of the battery 3002, respectively. The upper plate 220 can rotate through the node connection module 223 by the control signal CS to electrically connect or disconnect two adjacent nodes among the plurality of bypass nodes 2321-2324.

[0048] Two adjacent nodes among the plurality of bypass nodes 2321-2324 may be arranged to be separated by a predetermined distance d2 with respect to the central portion 231. The separation distance between the bypass node 2321 and the bypass node 2322, the separation distance between the bypass node 2322 and the bypass node 2323, the separation distance between the bypass node 2323 and the bypass node 2324, and the separation distance between the bypass node 2324 and the bypass node 2321 may each be the predetermined distance d2.

[0049] The bypass node 2322 can be formed at a position rotated 90 degrees clockwise from the bypass node 2321 with respect to the central portion 231. The bypass node 2323 can be formed at a position rotated 90 degrees clockwise from the bypass node 2322 with respect to the central portion 231. The bypass node 2324 can be formed at a position rotated 90 degrees clockwise from the bypass node 2323 with respect to the central portion 231.

[0050] The predetermined distance d2 can be a distance belonging to a predetermined range based on the predetermined distance d1.

[0051] The separation distance between the central portion 221 and the first contact portion 2232a, the separation distance between the central portion 221 and the second contact portion 2232b, the separation distance between the central portion 231 and the bypass node 2321, the separation distance between the central portion 231 and the bypass node 2322, the separation distance between the central portion 231 and the bypass node 2323, and the separation distance between the central portion 231 and the bypass node 2324 may belong to a predetermined range based on a predetermined length.

[0052] The plurality of bypass nodes 2321-2324 shown in FIG. 2 may be examples of the plurality of terminals P200_1-P200_4 shown in FIG. 1. The bypass node 2321 may be an example of the terminal P200_1, the bypass node 2322 may be an example of the terminal P200_2, the bypass node 2323 may be an example of the terminal P200_3, and the bypass node 2324 may be an example of the terminal P200_4.

[0053] The bypass node 2321 can be connected to a wiring LN2 having one end connected to the negative terminal (-) of the capacitor 121 shown in FIG. 1. The bypass node 2322 can be connected to a wiring LN3 having one end connected to the terminal P2 shown in FIG. 1. The bypass node 2322 can be connected to a wiring LN4 having one end connected to the terminal P3 shown in FIG. 1. The bypass node 2324 can be connected to a wiring LN1 having one end connected to the positive terminal (+) of the capacitor 121 shown in FIG. 1.

[0054] Each of the node connection module 223 and the plurality of bypass nodes 2321-2324 can electrically connect the connected power paths.

[0055] The central portion 231 may be a region corresponding to the central portion 221. The lower plate 230 is connected to the plurality of wirings LN1-LN4 and does not rotate, and the upper plate 220 can rotate about the central axis 210. If the upper plate 220 rotates about the central axis 210, the node connection module 223 can electrically connect two adjacent bypass nodes (for example, 2322 and 2323) among the plurality of bypass nodes 2321-2324 through a bus bar or the like.

[0056] The bypass device 200 can include a rotation driving unit 211 that rotates the upper plate 220 about the central axis 210 according to a control signal CS.

[0057] For example, if the upper plate 220 rotates and stops at an angle where the lower part of the first contact portion 2232a abuts on the upper part of the bypass node 2322 and the lower part of the second contact portion 2232b abuts on the upper part of the bypass node 2323, the bypass device 200 can provide a bypass power path from the wiring LN3 to the wiring LN4 through the bypass node 2322, the first contact portion 2232a, the connecting portion 2231, the second contact portion 2232b, and the bypass node 2323.

[0058] If the upper plate 220 rotates and stops at an angle where the lower part of the first contact portion 2232a abuts on the upper part of the bypass node 2323 and the lower part of the second contact portion 2232b abuts on the upper part of the bypass node 2324, the bypass device 200 can provide a bypass power path from the wiring LN1 to the wiring LN4 through the bypass node 2324, the second contact portion 2232b, the connecting portion 2231, the first contact portion 2232a, and the bypass node 2323.

[0059] If the upper plate 220 rotates and stops at an angle where the lower part of the first contact portion 2232a abuts on the upper part of the bypass node 2321 and the lower part of the second contact portion 2232b abuts on the upper part of the bypass node 2322, the bypass device 200 can provide a bypass power path from the wiring LN2 to the wiring LN3 through the bypass node 2321, the first contact portion 2232a, the connecting portion 2231, the second contact portion 2232b, and the bypass node 2322.

[0060] Specifically, for the sake of convenience of explanation, it is described that the bypass device 200 rotates by the control signal CS to rotate the upper plate 220.

[0061] Hereinafter, with reference to FIGS. 3 to 5, the power path due to the rotation of the bypass device 200 shown in FIG. 1 will be described.

[0062] FIG. 3 is a circuit diagram showing a power path for connecting two batteries in series in a charger according to an embodiment.

[0063] The battery charging system 1_1 shown in FIG. 3 may be an example of the battery charging system 1 shown in FIG. 1. Referring to FIG. 3, the battery charging system 1_1 can include a processor 100, a charger 120, and a bypass device 200_1. Hereinafter, among the descriptions of the processor 100, the charger 120, the bypass device 200_1, and the two batteries 3001 and 3002, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0064] The bypass device 200_1 includes a node connection module 223, and the node connection module 223 can include a first contact portion 2232a, a connection portion 2231, and a second contact portion 2232b.

[0065] The bypass device 200_1 can rotate at an angle at which the first contact portion 2232a abuts on the terminal P200_2 and the second contact portion 2232b abuts on the terminal P200_3.

[0066] In the battery charging system 1_1, the positive terminal (+) of the capacitor 121 can be connected to the positive terminal (+) of the battery 3001 through a power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the positive terminal (+) of the battery 3002 through a power path passing through the terminal P2, the wiring LN3, the node connection module 223, the wiring LN4, and the terminal P3. The negative terminal (-) of the battery 3002 can be connected to the negative terminal (-) of the capacitor 121 through a power path passing through the terminal P4.

[0067] In the battery charging system 1_1, the charger 120 can supply power to the two batteries 3001 and 3002 through the bypass device 200_1.

[0068] FIG. 4 is a circuit diagram showing a power path in which the bypass device shown in FIG. 3 rotates 90 degrees in the clockwise direction to connect one of the two batteries to the charger according to an embodiment.

[0069] The battery charging system 1_2 shown in FIG. 4 can be an example illustration of the battery charging system 1 shown in FIG. 1. The battery charging system 1_2 shown in FIG. 4 can show a state where the bypass device 200 shown in the battery charging system 1 shown in FIG. 1 rotates 90 degrees in the clockwise direction or rotates 270 degrees in the counterclockwise direction.

[0070] Referring to FIG. 4, the battery charging system 1_2 can include a processor 100, a charger 120, and a bypass device 200_2. Hereinafter, among the descriptions of the processor 100, the charger 120, the bypass device 200_2, and the two batteries 3001 and 3002, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0071] The bypass device 200_2 includes a node connection module 223, and the node connection module 223 can include a first contact portion 2232a, a connection portion 2231, and a second contact portion 2232b.

[0072] The bypass device 200_2 can rotate to an angle at which the first contact portion 2232a abuts on the terminal P200_3 and the second contact portion 2232b abuts on the terminal P200_4. The processor 100 can rotate the bypass device 200_1 shown in FIG. 3 90 degrees in the clockwise direction through the control signal CS to realize the bypass device 200_2 shown in FIG. 4.

[0073] In the battery charging system 1_2, the positive terminal (+) of the capacitor 121 can be connected to the positive terminal (+) of the battery 3002 through a power path passing through the wiring LN1, the node connection module 223, the wiring LN4, and the terminal P3. The negative terminal (-) of the battery 3002 can be connected to the negative terminal (-) of the capacitor 121 through a power path passing through the terminal P4.

[0074] In the battery charging system 1_2, the charger 120 can supply power to the battery 3002 through the bypass device 200_2.

[0075] FIG. 5 is a circuit diagram showing a power path in which the bypass device shown in FIG. 3 rotates 90 degrees counterclockwise to connect one of two batteries to a charger according to an embodiment.

[0076] The battery charging system 1_3 shown in FIG. 5 can be an example of the battery charging system 1 shown in FIG. 1. The battery charging system 1_3 shown in FIG. 5 can show a state in which the bypass device 200 shown in FIG. 1 rotates 270 degrees clockwise or 90 degrees counterclockwise.

[0077] Referring to FIG. 5, the battery charging system 1_3 can include a processor 100, a charger 120, and a bypass device 200_3. Hereinafter, among the descriptions of the processor 100, the charger 120, the bypass device 200_3, and the two batteries 3001 and 3002, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0078] The bypass device 200_3 includes a node connection module 223, and the node connection module 223 can include a first contact portion 2232a, a connection portion 2231, and a second contact portion 2232b.

[0079] The bypass device 200_3 can rotate to an angle at which the first contact portion 2232a abuts on the terminal P200_3 and the second contact portion 2232b abuts on the terminal P200_4. The processor 100 can rotate the bypass device 200_1 shown in FIG. 3 90 degrees counterclockwise through the control signal CS to realize the bypass device 200_3 shown in FIG. 5. Alternatively, the processor 100 can rotate the bypass device 200_2 shown in FIG. 4 180 degrees clockwise or counterclockwise through the control signal CS to realize the bypass device 200_3 shown in FIG. 5.

[0080] In the battery charging system 1_3, the positive terminal (+) of the capacitor 121 can be connected to the positive terminal (+) of the battery 3001 through the power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the negative terminal (-) of the capacitor 121 through the power path passing through the terminal P2, the wiring LN3, the node connection module 223, and the wiring LN2.

[0081] In the battery charging system 1_3, the charger 120 can supply power to the battery 3001 through the bypass device 200_3.

[0082] Figure 6 is an exemplary diagram of a comparison circuit including a plurality of mechanical relays.

[0083] The comparison circuit 4 shown in Figure 6 is an example of a battery charging system and does not include a bypass device. The comparison circuit 4 can include a processor 400, a charger 420, and three mechanical relays 441 - 443.

[0084] The comparison circuit 4 can include a plurality of terminals C_P1 - C_P4. The plurality of terminals C_P1 - C_P4 can be connected to both ends of two batteries 5001 and 5002 respectively. The terminal C_P1 is connected to the positive terminal (+) of the battery 5001, the terminal C_P2 is connected to the negative terminal (-) of the battery 5001, the terminal C_P3 is connected to the positive terminal (+) of the battery 5002, and the terminal C_P4 can be connected to the negative terminal (-) of the battery 5002.

[0085] The charger 420 is connected to a power source and can use the power source to charge the capacitor 421 with energy. One end of the relay 441 is connected to the positive terminal (+) of the capacitor C0, and the other end of the relay 441 is connected to the terminal C_P3. One end of the relay 442 is connected to the negative terminal (-) of the capacitor C0, and the other end of the relay 442 is connected to the terminal C_P2. One end of the relay 443 is connected to the terminal C_P2, and the other end of the relay 443 is connected to the terminal C_P3.

[0086] The processor 400 can monitor the voltages across both ends of the two batteries 5001 and 5002 respectively, and determine at least one battery that is charged by receiving power supply from the charger 420 among the two batteries 5001 and 5002.

[0087] The processor 400 can receive the signals C_VP1, C_VN1, C_VP2, and C_VN2 that indicate voltages from both ends of the two batteries 3001 and 3002 respectively. The processor 400 can receive the voltage measurement signal C_VP1 that indicates the positive terminal voltage from the positive terminal (+) of the battery 5001. The processor 400 can receive the voltage measurement signal C_VN1 that indicates the negative terminal voltage from the negative terminal (-) of the battery 5001. The processor 400 can receive the voltage measurement signal C_VP2 that indicates the positive terminal voltage from the positive terminal (+) of the battery 5002. The processor 400 can receive the voltage measurement signal C_VN2 that indicates the negative terminal voltage from the negative terminal (-) of the battery 5002.

[0088] The processor 400 can derive the voltages across both ends of the two batteries 5001 and 5002 respectively based on the plurality of voltage measurement signals C_VP1, C_VN1, C_VP2, and C_VN2. For example, the processor 400 can derive the voltage across both ends of the battery 5001 based on the two voltage measurement signals C_VP1 and C_VN1.

[0089] The processor 400 can turn off the two relays 441 and 442 and turn on the relay 443 through the two relay control signals RCS1 and RCS2 at the off level and the relay control signal RCS3 at the on level, so as to connect the two batteries 5001 and 5002 in series across both ends of the charger 420.

[0090] Alternatively, the processor 400 can turn off two relays 441 and 443 at the off level and turn on relay 442 through the two relay control signals RCS1 and RCS3 at the off level and the relay control signal RCS2 at the on level, so as to connect the battery 5001 to both ends of the charger 420.

[0091] Alternatively, the processor 400 can turn off two relays 442 and 443 at the off level and turn on relay 441 through the two relay control signals RCS2 and RCS3 at the off level and the relay control signal RCS1 at the on level, so as to connect the battery 5002 to both ends of the charger 420.

[0092] In one embodiment, different from the comparison circuit 4 that realizes the bypass function through a plurality of mechanical relays 441-443, the battery charging system 1 can easily realize the bypass connection through one bypass device 200.

[0093] Hereinafter, a circuit according to an embodiment in which a plurality of bypass devices 200 shown in FIG. 1 are connected will be described with reference to FIGS. 7 to 10.

[0094] FIG. 7 is a circuit diagram showing a power path in which two batteries are connected in series to a charger in a battery charging system in which a plurality of bypass devices according to an embodiment are connected.

[0095] Referring to FIG. 7, the battery charging system 1_4 can include a processor 101, a charger 620, and a plurality of bypass devices 2001_1 and 2001_2.

[0096] Each of the plurality of bypass devices 2001_1 and 2001_2 shown in FIG. 7 can be realized with the same structure as the bypass device 200 shown in FIG. 1.

[0097] The battery charging system 1_4 can include a plurality of terminals P1 - P8. The plurality of terminals P1 - P8 can be connected to both ends of each of the plurality of batteries 3001 - 3004. Terminal P1 is connected to the positive terminal (+) of battery 3001, and terminal P2 can be connected to the negative terminal (-) of battery 3001. Terminal P3 is connected to the positive terminal (+) of battery 3002, and terminal P4 can be connected to the negative terminal (-) of battery 3002. Terminal P5 is connected to the positive terminal (+) of battery 3003, and terminal P6 can be connected to the negative terminal (-) of battery 3003. Terminal P7 is connected to the positive terminal (+) of battery 3004, and terminal P8 can be connected to the negative terminal (-) of battery 3004.

[0098] The charger 620 is connected to a power source and can use the power source to charge the capacitor 621 with energy.

[0099] Hereinafter, among the descriptions of the processor 101, the charger 620, the plurality of bypass devices 2001_1, 2001_2, and the plurality of batteries 3001 - 3004, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0100] The processor 101 can monitor the voltage across each of the plurality of batteries 3001 - 3004 and determine at least one battery among the plurality of batteries 3001 - 3004 that is charged by receiving power supply from the charger 620.

[0101] The processor 101 can receive signals VP1 - VP4, VN1 - VN4 that indicate voltages from both ends of each of the plurality of batteries 3001 - 3004.

[0102] Processor 101 can receive a voltage measurement signal VP1 indicating the positive terminal voltage from the positive terminal (+) of battery 3001. Processor 101 can receive a voltage measurement signal VN1 indicating the negative terminal voltage from the negative terminal (-) of battery 3001. Processor 101 can receive a voltage measurement signal VP2 indicating the positive terminal voltage from the positive terminal (+) of battery 3002. Processor 101 can receive a voltage measurement signal VN2 indicating the negative terminal voltage from the negative terminal (-) of battery 3002.

[0103] Processor 101 can receive a voltage measurement signal VP3 indicating the positive terminal voltage from the positive terminal (+) of battery 3003. Processor 101 can receive a voltage measurement signal VN3 indicating the negative terminal voltage from the negative terminal (-) of battery 3003. Processor 101 can receive a voltage measurement signal VP4 indicating the positive terminal voltage from the positive terminal (+) of battery 3004. Processor 101 can receive a voltage measurement signal VN4 indicating the negative terminal voltage from the negative terminal (-) of battery 3004.

[0104] Processor 101 can derive the terminal voltages of each of the plurality of batteries 3001-3004 based on the plurality of voltage measurement signals VP1-VP4, VN1-VN4. For example, processor 101 can derive the terminal voltage of battery 3001 based on the two voltage measurement signals VP1 and VN1.

[0105] Processor 101 can generate two control signals CS1 and CS2 based on the terminal voltages of each of the plurality of batteries 3001-3004. Processor 101 can monitor the terminal voltage of each of the plurality of batteries 3001-3004 to check the charge state. By comparing the terminal voltages of each of the plurality of batteries 3001-3004 with a predetermined reference voltage, if the terminal voltage of each of the plurality of batteries 3001-3004 is equal to or higher than the predetermined reference voltage, processor 101 can determine that the battery corresponding to the exceeding terminal voltage is fully charged.

[0106] When charging a plurality of batteries 3001-3004 in series, the charging speed of each battery may be different. The processor 101 can generate a control signal CS1 that instructs the rotation of the bypass device 2001_1 so that the battery (for example, 3001) determined to be fully charged first among the plurality of batteries 3001-3004 does not receive power supply from the charger 620.

[0107] The charger 620 can supply power to at least one of the plurality of batteries 3001-3004.

[0108] The bypass device 2001_1 includes a node connection module 2230_1, and the node connection module 2230_1 can include a first contact portion 2232a_1, a connection portion 2231_1, and a second contact portion 2232b_1.

[0109] The bypass device 2001_2 includes a node connection module 2230_2, and the node connection module 2230_2 can include a first contact portion 2232a_2, a connection portion 2231_2, and a second contact portion 2232b_2.

[0110] The battery charging system 1_4 can include a plurality of wirings LN1-LN8 indicating a plurality of power paths. The bypass device 2001_1 can include a plurality of terminals P201_1-P201_4, and the bypass device 2001_2 can include a plurality of terminals P202_1-P202_4.

[0111] The wiring LN1 can be arranged along the power path between the positive terminal (+) of the capacitor 621 and the terminal P201_4. The wiring LN2 can be arranged along the power path between the terminal P201_1 and the first node N1. The first node N1 may be a node connected to the terminal P4 and the terminal P5. The wiring LN3 can be arranged along the power path between the terminal P2 and the terminal P201_2. The wiring LN4 can be arranged along the power path between the terminal P3 and the terminal P201_3.

[0112] The wiring LN5 can be arranged along the power path between the first node N1 and the terminal P202_4. The wiring LN6 can be arranged along the power path between the terminal P202_1 and the negative terminal (-) of the capacitor 621. The wiring LN7 can be arranged along the power path between the terminal P6 and the terminal P202_2. The wiring LN8 can be arranged along the power path between the terminal P7 and the terminal P202_3.

[0113] In FIG. 7, the number of the plurality of bypass devices 2001_1 and 2001_2 is shown as two, but this is for the convenience of explanation and the invention is not limited thereto. The battery charging system 1 can include two or more bypass devices corresponding to four or more batteries constituting the battery charging system 1.

[0114] The bypass device 2001_1 can rotate at an angle at which the first contact portion 2232a_1 can contact the terminal P201_2 and the second contact portion 2232b_1 can contact the terminal P201_3. The processor 101 can implement the bypass device 2001_1 shown in FIG. 7 through the control signal CS1.

[0115] The bypass device 2001_2 can rotate at an angle at which the first contact portion 2232a_2 can contact the terminal P202_2 and the second contact portion 2232b_2 can contact the terminal P202_3. The processor 101 can implement the bypass device 2001_2 shown in FIG. 7 through the control signal CS2.

[0116] In the battery charging system 1_4, the positive terminal (+) of the capacitor 621 can be connected to the positive terminal (+) of the battery 3001 through the power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the positive terminal (+) of the battery 3002 through the power path passing through the terminal P2, the wiring LN3, the bypass device 2001_1, the wiring LN4, and the terminal P3. The negative terminal (-) of the battery 3002 can be connected to the positive terminal (+) of the battery 3003 through the power path passing through the terminal P4, the first node N1, and the terminal P5. The negative terminal (-) of the battery 3003 can be connected to the positive terminal (+) of the battery 3004 through the power path passing through the terminal P6, the wiring LN7, the bypass device 2001_2, the wiring LN8, and the terminal P7. The negative terminal (-) of the battery 3004 can be connected to the negative terminal (-) of the capacitor 621 through the power path passing through the terminal P8.

[0117] In the battery charging system 1_4, the charger 620 can supply power to the four batteries 3001 - 3004 through the two bypass devices 2001_1 and 2001_2.

[0118] When the processor 101 determines that the battery 3003 among the plurality of batteries 3001 - 3004 is fully charged first, it can rotate the bypass device 2001_2 through the control signal CS2.

[0119] FIG. 8 is a circuit diagram showing the power path for connecting three of the four batteries to the charger according to an embodiment in which one of the two bypass devices shown in FIG. 7 is rotated 90 degrees in the clockwise direction.

[0120] Referring to FIG. 8, the battery charging system 1_5 can include a processor 101, a charger 620, and a plurality of bypass devices 2001_1 and 2001_3. The bypass device 2001_3 can be the bypass device 2001_2 shown in FIG. 7 rotated 90 degrees in the clockwise direction.

[0121] Each of the plurality of bypass devices 2001_1 and 2001_3 shown in FIG. 8 can be realized with the same structure as the bypass device 200 shown in FIG. 1.

[0122] The battery charging system 1_5 shown in FIG. 8 can show a state in which the bypass device 2001_2 among the plurality of bypass devices 2001_1 and 2001_2 shown in the battery charging system 1_4 shown in FIG. 7 rotates 90 degrees in the clockwise direction or rotates 270 degrees in the counterclockwise direction.

[0123] Hereinafter, among the descriptions regarding the processor 101, the charger 620, the plurality of bypass devices 2001_1 and 2001_3, and the plurality of batteries 3001 - 3004, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0124] The bypass device 2001_3 includes a node connection module 2230_2, and the node connection module 2230_2 can include a first contact portion 2232a_2, a connection portion 2231_2, and a second contact portion 2232b_2.

[0125] The bypass device 2001_1 can rotate to an angle at which the first contact portion 2232a_1 abuts on the terminal P201_2 and the second contact portion 2232b_1 abuts on the terminal P201_3. The processor 101 can realize the bypass device 2001_1 shown in FIG. 8 through the control signal CS1. The rotation angle of the bypass device 2001_1 shown in FIG. 8 may be the same as the rotation angle of the bypass device 2001_1 shown in FIG. 7.

[0126] The bypass device 2001_3 can rotate to an angle at which the first contact portion 2232a_2 abuts on the terminal P202_3 and the second contact portion 2232b_2 abuts on the terminal P202_4. The processor 101 can rotate the bypass device 2001_2 shown in FIG. 7 90 degrees in the clockwise direction through the control signal CS2 to realize the bypass device 2001_3 shown in FIG. 8.

[0127] In the battery charging system 1_5, the positive terminal (+) of the capacitor 621 can be connected to the positive terminal (+) of the battery 3001 through a power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the positive terminal (+) of the battery 3002 through a power path passing through the terminal P2, the wiring LN3, the bypass device 2001_1, the wiring LN4, and the terminal P3. The negative terminal (-) of the battery 3002 can be connected to the positive terminal (+) of the battery 3004 through a power path passing through the terminal P4, the first node N1, the wiring LN5, the bypass device 2001_3, the wiring LN8, and the terminal P7. The negative terminal (-) of the battery 3004 can be connected to the negative terminal (-) of the capacitor 621 through a power path passing through the terminal P8.

[0128] In the battery charging system 1_5, the charger 620 can supply power to three batteries 3001, 3002, and 3004 through two bypass devices 2001_1 and 2001_3.

[0129] When the processor 101 determines that the battery 3002 among the three batteries 3001, 3002, and 3004 is fully charged first, it can rotate the bypass device 2001_1 through the control signal CS1.

[0130] FIG. 9 is a circuit diagram showing a power path for connecting two of the four batteries to a charger according to an embodiment in which one of the two bypass devices shown in FIG. 8 is rotated 90 degrees in the counterclockwise direction.

[0131] Referring to FIG. 9, the battery charging system 1_6 can include a processor 101, a charger 620, and a plurality of bypass devices 2001_3 and 2001_4. The bypass device 2001_4 can be the bypass device 2001_1 shown in FIG. 8 rotated 90 degrees in the counterclockwise direction.

[0132] Each of the plurality of bypass devices 2001_3 and 2001_4 shown in FIG. 9 can be realized with the same structure as the bypass device 200 shown in FIG. 1.

[0133] The battery charging system 1_6 shown in FIG. 9 can show a state in which the bypass device 2001_1 among the plurality of bypass devices 2001_1 and 2001_3 shown in the battery charging system 1_5 shown in FIG. 8 rotates 270 degrees in the clockwise direction or rotates 90 degrees in the counterclockwise direction.

[0134] Hereinafter, among the descriptions regarding the processor 101, the charger 620, the plurality of bypass devices 2001_3 and 2001_4, and the plurality of batteries 3001 - 3004, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0135] The bypass device 2001_4 includes a node connection module 2230_1, and the node connection module 2230_1 can include a first contact portion 2232a_1, a connection portion 2231_1, and a second contact portion 2232b_1.

[0136] The bypass device 2001_4 can rotate to an angle at which the first contact portion 2232a_1 abuts on the terminal P201_1 and the second contact portion 2232b_1 abuts on the terminal P201_2. The processor 101 can rotate the bypass device 2001_1 shown in FIG. 8 90 degrees in the counterclockwise direction through the control signal CS1 to realize the bypass device 2001_4 shown in FIG. 9.

[0137] The bypass device 2001_3 can rotate to an angle at which the first contact portion 2232a_2 abuts on the terminal P202_3 and the second contact portion 2232b_2 abuts on the terminal P202_4. The processor 101 can realize the bypass device 2001_3 shown in FIG. 9 through the control signal CS2. The rotation angle of the bypass device 2001_3 shown in FIG. 9 may be the same as the rotation angle of the bypass device 2001_3 shown in FIG. 8.

[0138] In the battery charging system 1_6, the positive terminal (+) of the capacitor 621 can be connected to the positive terminal (+) of the battery 3001 through a power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the positive terminal (+) of the battery 3004 through a power path passing through the terminal P2, the wiring LN3, the bypass device 2001_4, the wiring LN2, the first node N1, the wiring LN5, the bypass device 2001_3, the wiring LN8, and the terminal P7. The negative terminal (-) of the battery 3004 can be connected to the negative terminal (-) of the capacitor 621 through a power path passing through the terminal P8.

[0139] In the battery charging system 1_6, the charger 620 can supply power to the two batteries 3001 and 3004 through the two bypass devices 2001_3 and 2001_4.

[0140] When the processor 101 determines that the battery 3004 among the two batteries 3001 and 3004 is fully charged first, the processor 101 can rotate the bypass device 2001_3 through the control signal CS2.

[0141] FIG. 10 is a circuit diagram showing a power path in which one of the two bypass devices shown in FIG. 9 rotates 90 degrees in the clockwise direction to connect one of the four batteries to the charger according to an embodiment.

[0142] Referring to FIG. 10, the battery charging system 1_7 can include a processor 101, a charger 620, and a plurality of bypass devices 2001_4 and 2001_5. The bypass device 2001_5 can be the bypass device 2001_3 shown in FIG. 9 rotated 90 degrees in the clockwise direction.

[0143] Each of the plurality of bypass devices 2001_4 and 2001_5 shown in FIG. 10 can be implemented with the same structure as the bypass device 200 shown in FIG. 1.

[0144] The battery charging system 1_7 shown in FIG. 10 can show a state in which the bypass device 2001_3 among the plurality of bypass devices 2001_3 and 2001_4 shown in the battery charging system 1_9 shown in FIG. 9 rotates 90 degrees in the clockwise direction or rotates 270 degrees in the counterclockwise direction.

[0145] Hereinafter, among the descriptions of the processor 101, the charger 620, the plurality of bypass devices 2001_4 and 2001_5, and the plurality of batteries 3001 - 3004, the descriptions of the parts overlapping with the previous descriptions are omitted.

[0146] The bypass device 2001_5 includes a node connection module 2230_2, and the node connection module 2230_2 can include a first contact portion 2232a_2, a connection portion 2231_2, and a second contact portion 2232b_2.

[0147] The bypass device 2001_4 can rotate to an angle at which the first contact portion 2232a_1 abuts on the terminal P201_1 and the second contact portion 2232b_1 abuts on the terminal P201_2. The processor 101 can realize the bypass device 2001_4 shown in FIG. 10 through the control signal CS1. The rotation angle of the bypass device 2001_4 shown in FIG. 10 may be the same as the rotation angle of the bypass device 2001_4 shown in FIG. 9.

[0148] The bypass device 2001_5 can rotate to an angle at which the first contact portion 2232a_2 abuts on the terminal P202_4 and the second contact portion 2232b_2 abuts on the terminal P202_1. The processor 101 can realize the bypass device 2001_5 shown in FIG. 10 by rotating the bypass device 2001_3 shown in FIG. 9 90 degrees in the clockwise direction through the control signal CS2.

[0149] In the battery charging system 1_7, the positive terminal (+) of the capacitor 621 can be connected to the positive terminal (+) of the battery 3001 through a power path passing through the terminal P1. The negative terminal (-) of the battery 3001 can be connected to the negative terminal (-) of the capacitor 621 through a power path passing through the terminal P2, the wiring LN3, the bypass device 2001_4, the wiring LN2, the first node N1, the wiring LN5, the bypass device 2001_3, and the wiring LN6.

[0150] In the battery charging system 1_7, the charger 620 can supply power to one battery 3001 through two bypass devices 2001_4 and 2001_5.

[0151] FIG. 11 is a flowchart of a battery charging method according to an embodiment.

[0152] Hereinafter, with reference to the battery charging system 1 shown in FIG. 1, the flowchart of FIG. 11 will be described. Among the descriptions of the processor 100, the charger 120, the bypass device 200, and the plurality of batteries 3001 and 3002, the descriptions of the parts overlapping with the previous descriptions will be omitted.

[0153] Referring to FIG. 11, the processor 100 can receive a plurality of voltage measurement signals VP1, VN1, VP2, and VN2 from both ends of each of the plurality of batteries 3001 and 3002 (S100).

[0154] The processor 100 can derive the voltage across each of the plurality of batteries 3001 and 3002 based on the plurality of voltage measurement signals VP1, VN1, VP2, and VN2 (S200).

[0155] The processor 100 can generate a control signal CS for electrically isolating the battery corresponding to the voltage across both ends equal to or higher than a predetermined reference voltage from the charger among the plurality of batteries 3001 and 3002 and transmit it to the bypass device 200 (S300).

[0156] The bypass device 200 that has received the control signal CS can rotate according to the rotation direction and rotation angle indicated by the control signal CS (S400).

[0157] Referring to FIGS. 3 and 4 for description, in the state shown in FIG. 3, if two batteries 3001 and 3002 are charged through the charger 120 and it is determined that the voltage across the battery 3001 is equal to or higher than the reference voltage, the processor 100 can generate a control signal CS for electrically separating the battery 3001 from the charger 120 and transmit it to the bypass device 200. The control signal CS for electrically separating the battery 3001 from the charger 120 can include a signal instructing the bypass device 200 to rotate 90 degrees in the clockwise direction.

[0158] The bypass device 200 that has received the control signal CS instructing it to rotate 90 degrees in the clockwise direction can rotate 90 degrees in the clockwise direction as shown in FIG. 4.

[0159] Referring again to FIG. 11, the charger 120 can charge at least one battery connected to both ends (S500).

[0160] In the example of FIG. 3, the charger 120 can charge two batteries 3001 and 3002 connected to both ends, and in the example of FIG. 4, the charger 120 can charge the battery 3002 connected to both ends.

[0161] Although the embodiments of the present invention have been described in detail above, the scope of the rights of the present invention is not limited thereto, and forms variously modified and improved by those having ordinary knowledge in the field to which the present invention pertains also belong to the scope of the rights of the present invention.

Claims

1. In a battery charging system connected to both ends of each of a plurality of batteries, a charger for supplying power; a bypass device that rotates about a central axis and provides a power path for connecting at least one of a first battery and a second battery to both ends of the charger; and a battery charging system including a processor that monitors the voltage at both ends of each of the first battery and the second battery and controls the rotation direction and rotation angle of the bypass device.

2. The bypass device includes a first plate including a plurality of bypass nodes electrically connected to a positive terminal of the charger, a negative terminal of the charger, a negative terminal of the first battery, and a positive terminal of the second battery respectively; and a second plate including a node connection module that rotates according to a control signal of the processor and electrically connects two nodes indicated by the control signal among the plurality of bypass nodes. The battery charging system according to claim 1.

3. The positive terminal of the charger is connected to the positive terminal of the first battery, and the negative terminal of the charger is connected to the negative terminal of the second battery. The battery charging system according to claim 2.

4. If the node connection module electrically connects the node connected to the negative terminal of the first battery and the node connected to the positive terminal of the second battery, the charger supplies power to the first battery and the second battery. The battery charging system according to claim 3.

5. If the node connection module electrically connects the node connected to the negative terminal of the first battery and the node connected to the negative terminal of the charger, the charger supplies power to the first battery. The battery charging system according to claim 3.

6. If the node connection module electrically connects the node connected to the positive terminal of the second battery and the node connected to the positive terminal of the charger, the charger supplies power to the second battery. The battery charging system according to claim 3.

7. The processor Comparing the terminal voltages of the first battery and the second battery with a predetermined reference voltage, and controlling the bypass device so that the battery corresponding to the terminal voltage that is greater than or equal to the reference voltage among the first battery and the second battery is electrically separated from the positive and negative terminals of the charger, the battery charging system according to claim 1.

8. Receiving a plurality of voltage measurement signals from both ends of the first battery and the second battery respectively; Deriving the terminal voltages of the first battery and the second battery respectively based on the plurality of voltage measurement signals; Comparing the terminal voltages of the first battery and the second battery with a predetermined reference voltage to generate a control signal; The bypass device that receives the control signal rotates around a central axis to provide a power path for connecting at least one of the first battery and the second battery to both ends of the charger; and A battery charging method including supplying power to the at least one battery through the charger.

9. If the bypass device electrically connects the node connected to the negative terminal of the first battery and the node connected to the positive terminal of the second battery, The step of supplying the power, The battery charging method according to claim 8, including supplying power to the first battery and the second battery.

10. If the bypass device electrically connects the node connected to the negative terminal of the first battery and the node connected to the negative terminal of the charger, The step of supplying the power, The battery charging method according to claim 8, including supplying power to the first battery.

11. If the bypass device electrically connects the node connected to the positive terminal of the second battery and the node connected to the positive terminal of the charger, The step of supplying the power, The battery charging method according to claim 8, including supplying power to the second battery.

Images