WO2024122784A1 - 배터리 팩 전압 측정 회로 - Google Patents
배터리 팩 전압 측정 회로 Download PDFInfo
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- WO2024122784A1 WO2024122784A1 PCT/KR2023/010223 KR2023010223W WO2024122784A1 WO 2024122784 A1 WO2024122784 A1 WO 2024122784A1 KR 2023010223 W KR2023010223 W KR 2023010223W WO 2024122784 A1 WO2024122784 A1 WO 2024122784A1
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- battery pack
- pack voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
- H02J7/64—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2105/00—Networks for supplying or distributing electric power characterised by their spatial reach or by the load
- H02J2105/30—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles
- H02J2105/33—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles exchanging power with road vehicles
- H02J2105/37—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles exchanging power with road vehicles exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
- H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage
Definitions
- the present invention relates to a battery pack voltage measurement circuit, and more particularly to a battery pack voltage measurement circuit that measures the voltage of a battery pack and outputs the result.
- Batteries that can be charged and discharged are widely used as an energy source for mobile devices such as smartphones.
- batteries are also used as an energy source for eco-friendly vehicles such as electric vehicles and hybrid electric vehicles, which are proposed as a solution to air pollution caused by gasoline vehicles and diesel vehicles that use fossil fuels.
- eco-friendly vehicles such as electric vehicles and hybrid electric vehicles, which are proposed as a solution to air pollution caused by gasoline vehicles and diesel vehicles that use fossil fuels.
- the types of applications that use batteries are becoming very diverse, and in the future, batteries are expected to be applied to more fields and products than now.
- a battery pack includes at least one battery module, and the battery module may be composed of a plurality of battery cells. Additionally, battery packs are being developed with high-capacity and high-voltage specifications to enable longer use and more powerful operation in response to consumer demands.
- the high voltage specifications of the battery pack provide more powerful driving force to power-consuming devices such as electric vehicles that use it.
- the internal characteristics and internal resistance of the battery cells constituting the battery pack are different, voltage deviations between battery cells may occur as the high-voltage battery is continuously charged and discharged. If the voltage difference between battery cells accumulates, the battery cells may be overcharged or overdischarged, causing fatal damage to the high-voltage battery. Additionally, if the lifespan or performance of the battery cells constituting the battery pack is reduced or deteriorated, the performance of the battery pack may deteriorate. Therefore, in order to monitor and manage the performance of the battery pack, it is necessary to accurately measure the voltage of the battery pack, which determines the performance of the battery pack, and for this purpose, the battery pack is provided with a battery pack voltage measurement circuit.
- the battery pack voltage measurement circuit includes a relay switch and ADC (Analog to Digital Converting) output circuit.
- the relay switch performs on/off operation based on overcurrent
- the ADC output circuit measures the voltage of the battery pack according to the current flowing through the relay switch.
- the battery pack voltage measurement circuit must also be designed to accommodate the increased voltage of the battery pack.
- the relay switch included in the battery pack voltage measurement circuit must satisfy the allowable voltage value of 800V.
- the relay switch that operates stably at an allowable voltage value of 800V, advanced process technology and high-quality materials must be used, so a very high price, that is, a high-specification relay switch is required. If a low-specification relay switch with an existing allowable voltage value of 400V is used to measure the voltage of an 800V battery pack, the off time of the relay switch may be delayed, which may cause various problems.
- a battery pack voltage measurement circuit can be formed by connecting the low-spec relay switch and relay resistance in parallel. That is, the first resistor, relay circuit, second resistor, and ADC output circuit are connected in series between the power terminal and ground terminal of the battery pack, and the relay circuit has a relay element and relay resistance connected in parallel to form a battery pack voltage measurement circuit. can do.
- This battery pack voltage measurement circuit has the advantage of being able to use a 400V rated relay switch even in an 800V battery pack by adding a relay resistance in parallel with the relay switch.
- leakage current occurs through the relay resistance even after the relay switch is turned off.
- the first and second resistors are set to a resistance ratio of 800V, a problem of reduced measurement accuracy occurs when measuring the battery pack voltage of 400V, which generally has a higher resistance ratio.
- the present invention provides a battery pack voltage measurement circuit capable of measuring high voltage using a low-specification relay switch.
- the present invention provides a battery pack voltage measurement circuit that can prevent leakage current even when using a low-specification relay switch.
- a battery pack voltage measurement circuit includes a relay unit that initiates battery pack voltage measurement; First and second branch units provided between a battery pack voltage input terminal and the relay unit and branching the battery pack voltage into different paths according to the battery pack voltage and supplying the battery pack voltage to the relay unit; and a voltage distribution unit that divides the battery pack voltage supplied through the first or second branch unit and the relay unit and outputs the battery pack voltage to an output terminal.
- the first branch unit includes a first resistor and a first switch connected in series between the battery pack voltage input terminal and the relay unit.
- the second branch portion is connected in series between the battery pack voltage input terminal and the relay portion and includes a second resistor and a second switch respectively connected in parallel with the first resistor and the first switch.
- the relay unit includes a relay switch and a third resistor connected in parallel between the connection points of the first and second branch units and the voltage distribution unit.
- the control unit selectively opens and closes the first and second switches according to the level of the battery pack voltage.
- a first resistance ratio which is the ratio of the sum of the resistances of the voltage divider and the first resistance
- a second resistance ratio which is the ratio of the sum of the resistances of the voltage divider and the second resistance
- a battery pack voltage measuring circuit includes a first branch provided between a battery pack voltage input terminal and a first node to branch the first battery pack voltage; a second branch provided between the battery pack voltage input terminal and the first node and connected in parallel with the first branch to branch a second battery pack voltage; a relay unit provided between the first node and the second node and starting measurement of the battery pack voltage according to a switching operation; and a voltage distribution unit provided between the second node and the ground terminal to distribute the battery pack voltage supplied through the first or second branch unit and the relay unit and output the battery pack voltage to the output terminal.
- the first branch includes a first resistor and a first switch connected in series between the battery pack voltage input terminal and the first node.
- the second branch part is connected in series between the battery pack voltage input terminal and the first node and includes a second resistor and a second switch respectively connected in parallel with the first resistor and the first switch.
- the relay unit includes a relay switch and a third resistor connected in parallel between the first node and the second node.
- the control unit selectively opens and closes the first and second switches according to the level of the battery pack voltage.
- the resistance values of the first resistor and the second resistor are different from each other.
- the battery pack voltage measurement circuit according to an embodiment of the present invention can be mass-produced at a lower manufacturing cost because it is possible to use a relay switch with low specifications.
- the present invention connects the relay resistance in parallel with the relay switch, so that even when the relay switch is turned off due to the relay resistance, only a low level battery pack voltage, which is part of the battery pack voltage, is applied.
- a relay rated at 400V can operate at 800V. There are effects applicable to voltage.
- the battery pack voltage is branched through the first and second branch parts, it is possible to measure two different battery pack voltages. That is, since the battery pack voltage of 400V is branched through the first branch and the battery pack voltage of 800V is branched through the second branch, it is possible to measure the battery pack voltage of 400V or 800V using one battery pack voltage measurement circuit. . Therefore, one battery pack voltage measurement circuit can be used in a system to which a 400V battery pack is applied and to a system to which an 800V battery pack is applied, thereby reducing product development costs, etc. by eliminating the need to develop different battery pack voltage measurement circuits. There is.
- the battery pack voltage measurement circuit can be controlled by the first and second switches of the first and second branch portions, the generation of leakage current through the relay resistance can be prevented even when the relay switch is turned off. . That is, assuming the case where there are no first and second switches, leakage current may be generated through the relay resistance when the relay switch is turned off, but when the relay switch is turned off, the first and second switches also remain in the off state. Leakage current through relay resistance can be prevented.
- FIG. 1 is a circuit diagram of a battery pack voltage measurement circuit according to an embodiment of the present invention.
- FIGS. 2 to 4 are circuit diagrams showing current flow to explain a method of driving a battery pack voltage measurement circuit according to an embodiment of the present invention.
- FIG. 1 is a circuit diagram of a battery pack voltage measurement circuit according to an embodiment of the present invention.
- the battery pack voltage measurement circuit includes a first branch 100 connected between a battery pack voltage input terminal, that is, a power terminal (Vpack) and a ground terminal (GND), and a second branch 100. It may include a branch unit 200, a relay unit 300, and a voltage distribution unit 400. More specifically, the battery pack voltage measurement circuit according to an embodiment of the present invention includes first and second branches 100 and 200 connected in parallel between the power terminal (Vpack) and the first node (Q11), and the first node It includes a relay unit 300 connected between Q11 and the second node Q12, and a voltage distribution unit 400 connected between the second node Q12 and the ground terminal GND.
- the first and second branch units 100 and 200 set the paths of the current input from the power terminal (Vpack) to the first and second paths.
- the relay unit 300 includes a relay switch (RS11) connected in parallel and a relay resistance, that is, a third resistor (R13), and starts measuring the battery pack voltage by turning on/off the relay switch (S13) and Stop.
- the voltage divider 400 divides the voltage of the current input through the first path or the second path to measure the voltage output to the output terminal DEC and outputs the divided voltage.
- the first branch 100 is connected between the power terminal (Vpack) and the first node (Q11), and is connected in parallel with the second branch 200.
- This first branch 100 may include a first resistor R11 and a first switch S11 connected in series between the power terminal Vpack and the first node Q11. That is, the first resistor R11 and the first switch S11 are connected in series between the power terminal Vpack and the first node Q11 to form the first branch 100.
- the first branch 100 sets the current to flow through the first path through the first branch 100 according to the battery pack voltage. That is, when the first current according to the first voltage is applied from the power terminal (Vpack), the first branch 100 is driven so that the current flows through the first path through the first branch 100.
- the first voltage of the battery pack may be 400V. That is, when the battery pack voltage is 400V, current flows through the first branch 100.
- the first switch S11 may be a FET driven according to the first control signal CTRL1 from a controller (not shown).
- the control unit When the battery pack voltage is the first voltage, that is, 400V, the control unit generates a first control signal (CTRL1), and the first switch (S11) is driven accordingly, causing current to flow through the first branch 100.
- CTRL1 the first control signal
- the first control signal CTRL1 is output at a logic high level to drive the first switch (S11).
- the first control signal CTRL1 is not generated when the battery pack voltage is a second voltage higher than the first voltage, thereby turning off the first switch S11.
- the first control signal CTRL1 is output at a logic low level to turn off the first switch S11.
- the first branch unit 100 drops the battery pack voltage and supplies it to the relay unit 300. That is, the first branch unit 100 drops the battery pack voltage of 400V by the first resistor R11 and supplies it to the relay unit 300. Therefore, even if a battery pack voltage of 400V is applied to the power terminal (Vpack), a voltage lowered by the first resistor (R11) is applied to the relay unit 300.
- the battery pack voltage measurement circuit of the present invention supplies a voltage of 400V to the voltage distribution unit 400 through the first branch unit 100, divides the voltage by, for example, 100:1, and outputs the voltage.
- the first resistor R11 may have a resistance value in a predetermined ratio with the fourth and fifth resistors R14 and R15 of the voltage divider 400. For example, if the fourth resistor R14 is 1 M ⁇ and the fifth resistor R15 is 20 k ⁇ , the first resistor R11 may have a resistance value of 1 M ⁇ .
- the first resistor (R11) has a resistance value of a predetermined ratio with the fourth and fifth resistors (R14, R15), so that the voltage of 400V through the first branch 100 is divided by 100:1 and output to the output terminal ( DEC) can be output.
- the second branch 200 is connected between the power terminal (Vpack) and the first node (Q11) and is connected in parallel with the first branch 100.
- This second branch 200 may include a second resistor R12 and a second switch S12 connected in series between the power terminal Vpack and the first node Q11. That is, the second resistor R12 and the second switch S12 are connected in series between the power terminal Vpack and the first node Q11 to form the second branch 200.
- the second branch 200 sets the current to flow through the second path through the second branch 200 according to the battery pack voltage. That is, when the second current according to the second voltage is applied from the power terminal (Vpack), the second branch 200 is driven so that the current flows through the second path through the second branch 200.
- the second voltage of the battery pack may be 800V. That is, when the battery pack voltage is 800V, current flows through the second branch 200.
- the second switch S12 may be a FET driven according to the second control signal CTRL2 from a controller (not shown).
- the control unit When the battery pack voltage is the second voltage, that is, 800V, the control unit generates a second control signal (CTRL2), and the second switch (S12) is driven accordingly, causing current to flow through the second branch portion (200).
- CTRL2 the second control signal
- the second control signal CTRL2 is output at a logic high level to drive the second switch S12.
- the second control signal CTRL2 is not generated when the battery pack voltage is a first voltage lower than the second voltage, thereby turning off the second switch S12.
- the second control signal CTRL2 is output at a logic low level to turn off the second switch S12.
- the second branch unit 200 drops the battery pack voltage and supplies it to the relay unit 300. That is, the second branch unit 100 drops the battery pack voltage of 800V by the second resistor R12 and supplies it to the relay unit 300. Therefore, even if a battery pack voltage of 800V is applied to the power terminal (Vpack), a voltage lowered by the second resistor (R12) is applied to the relay unit 300.
- the battery pack voltage measurement circuit of the present invention supplies a voltage of 800V to the voltage distribution unit 400 through the second branch unit 200, divides the voltage by, for example, 200:1, and outputs the voltage.
- the second resistor R11 may have a resistance value in a predetermined ratio with the fourth and fifth resistors R14 and R15 of the voltage divider 400. For example, if the fourth resistor R14 is 1M ⁇ and the fifth resistor R15 is 20K ⁇ , the second resistor R11 may have a resistance value of 3M ⁇ .
- the first resistor (R11) has a resistance value of a predetermined ratio with the fourth and fifth resistors (R14, R15), so that the voltage of 800V through the second branch 200 is divided by 200:1 and output terminal ( DEC) can be output.
- the relay unit 300 is connected between the first node (Q11) and the second node (Q12). That is, the relay unit 300 is provided between the first and second branch units 100 and 200 and the voltage distribution unit 400 connected in parallel.
- This relay unit 300 may include a third switch, that is, a relay switch (S13) and a third resistor, that is, a relay resistor (R13). At this time, the relay switch (R13) and the relay resistor (R13) are connected in parallel between the first node (Q11) and the second node (Q13).
- the relay switch R13 is driven by a control signal (not shown) for measuring the battery pack voltage and provides the voltage through the first branch 100 or the second branch 200 to the voltage distribution unit 400. . That is, when a control signal (not shown) is generated to measure the battery pack voltage and applied to the relay switch (S13), the relay switch (S13) is turned on and Voltage is provided to the voltage divider 400.
- the relay switch (S13) is not shown in detail in the drawing, but may be composed of a solenoid and a switch. The on or off operation of the relay switch S13 can be controlled based on the magnetic force generated in the solenoid.
- the relay resistor (R13) is connected in parallel with the relay switch (S13), so that when the relay switch (S13) is turned off, the voltage applied to both ends of the relay switch (S13) is the same as the voltage applied to both ends of the relay resistor (R13). do.
- the present invention connects the relay resistance (R13) in parallel with the relay switch (S13), so that even when the relay switch (S13) is turned off due to the relay resistance (R13), only the low level battery pack voltage that is part of the battery pack voltage is used. Therefore, for example, a relay rated at 400V can be applied to a voltage of 800V.
- the relay switch S13 since one side of the relay switch S13 receives a voltage dropped by the first branch 100 or the second branch 200, the relay switch S13 may be designed as a low-specification relay element. And, because the voltage dropped by the first branch 100 or the second branch 200 and the relay resistor R13 is applied to the other side of the relay switch (S13), the relay switch (S13) is a low-end relay switch. Even when used, stable on/off operation can be guaranteed.
- the present invention allows the battery pack voltage measurement circuit to be controlled by the first and second switches (S11 and S12) of the first and second branches 100 and 200, so that when the relay switch (S13) is turned off It is also possible to prevent leakage current through the relay resistance (R13). That is, assuming the case where the first and second switches (S11, S12) are not present, leakage current may be generated through the relay resistance (R13) when the relay switch (S13) is turned off, but the relay switch (S13) is turned off. In this case, the first and second switches (S11, S12) also remain in the off state, thereby preventing the generation of leakage current through the relay resistor (R13).
- the resistance value of the relay resistor R13 can be determined to satisfy [Equation 1] below.
- [Equation 1] is an equation excluding the ADC output circuit, that is, the fifth resistor (R15).
- R12, R13, and R14 are the resistance values of the second resistor (R12), the relay resistor (R13), and the fourth resistor (R14), respectively
- V lim is the allowable voltage value of the relay switch (S13)
- Vo is the battery This refers to the voltage value of the pack.
- the resistance value of the relay resistor (R13) in [Equation 1] is 2 It is affected by the resistance value of resistor (R12).
- the allowable voltage value (V lim ) of the relay element (S13) must be smaller than the voltage value (Vo) of the battery pack.
- the voltage value (Vo) of the battery pack is reduced by the resistance values of each of the second resistor (R12), relay resistor (R13), and fourth resistor (R14). Therefore, even if the voltage value (Vo) of the battery pack increases from, for example, 400V to 800V, if the resistance values of each of the second resistor (R12), relay resistor (R13), and fourth resistor (R14) are appropriately designed, the relay switch (S11) ) can satisfy the allowable voltage value (V lim ).
- the allowable voltage value (V lim ) of the relay switch (S13) is satisfied. This means that even if a low-specification relay switch (S13) is used, the voltage of the battery pack with a high voltage ( This means that Vo) can be measured stably.
- the relay switch S13 is turned off, a voltage dropped by the first or second resistors R11 and R12 is applied to one end of the relay switch S13, and a relay resistance is applied to both ends of the relay switch S13. The same voltage as that applied to both ends of (R13) is applied. Therefore, even if the relay switch S13 is used with low specifications, the off operation of the relay switch S13 can be performed stably.
- the battery pack voltage measurement circuit provides an environment in which the relay switch S13 can be used with low specifications.
- the resistance value of the relay resistor (R13) is determined to satisfy [Equation 2] below.
- Equation 1 is an equation including the ADC output circuit, that is, the fifth resistor (R13).
- R12, R13, R14, and R15 are the resistance values of the second resistor (R12), relay resistor (R13), fourth resistor (R14), and fifth resistor (R15), respectively
- V lim is the relay switch (S13) is the allowable voltage value
- Vo means the voltage value of the battery pack.
- the allowable voltage value (V lim ) of the relay switch (S13) may be smaller than the voltage value (Vo) of the battery pack, and the voltage value (Vo) of the battery pack is A voltage drop is caused by the resistance values of the second resistor (R12), the relay resistor (R13), the fourth resistor (R14), and the fifth resistor (R15).
- [Equation 2] can control the voltage value (Vo) of the battery pack to be lower by the resistance value of the fifth resistor (R15), which means that even if the voltage value (Vo) of the battery pack becomes higher, the relay This means that it can be included in the allowable voltage value (V lim ) of the switch (S13).
- the battery pack voltage measurement circuit can use the relay switch S13 with low specifications, the battery pack voltage measurement circuit can be mass-produced at a lower manufacturing cost.
- the present invention allows the battery pack voltage measurement circuit to be controlled by the first and second switches (S11 and S12) of the first and second branches 100 and 200, so that when the relay switch (S13) is turned off It is also possible to prevent leakage current through the relay resistance (R13). That is, when the relay switch S13 is turned off, the first and second switches S11 and S12 also remain in the off state, thereby preventing the generation of leakage current through the relay resistor R13.
- the voltage divider 400 is connected between the second node Q12 and the ground terminal (GND).
- the voltage divider 400 divides the voltage of the current input through the first path or the second path and outputs the divided voltage. That is, the voltage distribution unit 400 distributes the battery pack voltage (Vpack) supplied through the first branch unit 100 and the relay unit 300 and outputs it to the output terminal (DEC), and the second branch unit 200 ) and the battery pack voltage (Vpack) supplied through the relay unit 300 is distributed and output to the output terminal (DEC).
- the battery pack voltage supplied through the first branch 100 is 400V
- the battery pack voltage supplied through the second branch 200 is 800V. That is, the voltage divider 400 distributes the battery pack voltage of 400V or 800V and outputs it to the output terminal (DEC).
- This voltage divider 400 may include fourth and fifth resistors R14 and R15 connected in parallel between the second node Q12 and the ground terminal (GND). At this time, an output terminal (DEC) is provided between the fourth and fifth resistors 14 and 15. That is, the fourth resistor (R14) is connected between the second node (Q12) and the output terminal (DEC), and the fifth node (R15) is connected between the output terminal (DEC) and the ground terminal (GND) to divide the voltage. Makes distribution (400). Accordingly, the voltage divider 400 divides the battery pack voltage through the fourth and fifth resistors R14 and R15 and outputs it to the output terminal DEC.
- the fourth and fifth resistors R14 and R15 may have a predetermined resistance value. That is, the fourth and fifth resistors R14 and R15 may have resistance values that have a predetermined ratio with the resistance values of the first and second resistors R11 and R12.
- the fourth resistor R14 may have a resistance value of 1 M ⁇
- the fifth resistor R15 may have a resistance value of 20 k ⁇ .
- the first resistor R11 may have a resistance value of, for example, 1 M ⁇
- the second resistor R12 may have a resistance value of, for example, 3 M ⁇ .
- the fourth and fifth resistors have a resistance value of a predetermined ratio with the first and second resistors (R11 and R12), so that the voltage of 400V through the first branch 100 is divided by 100:1 and the second The voltage of 800V through the branch 200 can be divided and output to the output terminal (DEC).
- the battery pack voltage measurement circuit can use the relay switch S13 with low specifications, the battery pack voltage measurement circuit can be mass-produced at a lower manufacturing cost. That is, the present invention connects the relay resistance (R13) in parallel with the relay switch (S13), so that even when the relay switch (S13) is turned off due to the relay resistance (R13), only the low level battery pack voltage that is part of the battery pack voltage is used. Therefore, for example, a relay rated at 400V can be applied to a voltage of 800V.
- the present invention allows the battery pack voltage measurement circuit to be controlled by the first and second switches (S11 and S12) of the first and second branches 100 and 200, so that when the relay switch (S13) is turned off It is also possible to prevent leakage current through the relay resistance (R13). That is, assuming the case where the first and second switches (S11, S12) are not present, leakage current may be generated through the relay resistance (R13) when the relay switch (S13) is turned off, but the relay switch (S13) is turned off. In this case, the first and second switches (S11, S12) also remain in the off state, thereby preventing the generation of leakage current through the relay resistor (R13).
- the battery pack voltage is branched through the first and second branch parts 100 and 200, it is possible to measure two different battery pack voltages. That is, since the battery pack voltage of 400V is branched through the first branch 100 and the battery pack voltage of 800V is branched through the second branch 200, 400V or 800V is obtained using one battery pack voltage measurement circuit. It is possible to measure the battery pack voltage. Therefore, one battery pack voltage measurement circuit can be used in a system to which a 400V battery pack is applied and to a system to which an 800V battery pack is applied, thereby reducing product development costs, etc. by eliminating the need to develop different battery pack voltage measurement circuits. There is.
- FIG. 2 to 4 are circuit diagrams showing current flow to explain a method of driving a battery pack voltage measurement circuit according to an embodiment of the present invention. That is, FIG. 2 is a circuit diagram showing current flow when the battery pack voltage is 400V, FIG. 3 is a circuit diagram showing current flow when the battery pack voltage is 800V, and FIG. 4 shows a driving method when the switches are turned off. This is a circuit diagram for explanation.
- the relay switch S13 may be turned on by a predetermined control signal to measure the battery pack voltage.
- the control unit (not shown) may output the first control signal (CTRL1) or the second control signal (CTRL2) depending on the battery pack voltage. If the battery pack voltage is, for example, 400V, the first control signal (CTRL1) may be output at a high level and the second control signal CTRL2 may be output at a low level.
- CTRL1 the high-level first control signal
- CTRL2 may be output at a low level.
- the battery pack voltage of 400V is supplied to the relay unit 300 through the first path and then to the voltage distribution unit 400.
- a voltage drop occurs through the first branch unit 100 and the relay unit 300, and the voltage distribution unit 400 distributes the dropped battery pack voltage and outputs it to the output terminal (DEC).
- the first resistor (R11), the fourth resistor (R14), and the fifth resistor (R15) have a predetermined resistance value, and the battery pack voltage is accordingly lowered, for example, by 100:1 to the output terminal (DEC). It will be printed.
- the first, fourth, and fifth resistors may have resistance values of 1M ⁇ , 1M ⁇ , and 20K ⁇ , respectively.
- the battery pack voltage of 400V is dropped and distributed through the first branch unit 100, relay unit 300, and voltage distribution unit 500, and is output to the output terminal (DEC).
- the output value can be input to the analog-to-digital converter of the control unit (not shown), that is, the MCU.
- the relay switch S13 may be turned on by a predetermined control signal to measure the battery pack voltage.
- the control unit (not shown) may output the first control signal (CTRL1) or the second control signal (CTRL2) depending on the battery pack voltage. If the battery pack voltage is, for example, 800V, the second control signal (CTRL2) may be output at a high level and the first control signal CTRL1 may be output at a low level.
- CTRL1 the first control signal
- CTRL1 may be output at a low level.
- the battery pack voltage of 800V is supplied to the relay unit 300 through the second path and then to the voltage distribution unit 400.
- a voltage drop occurs through the second branch unit 200 and the relay unit 300, and the voltage distribution unit 400 distributes the dropped battery pack voltage and outputs it to the output terminal (DEC).
- the second resistor (R12), the fourth resistor (R14), and the fifth resistor (R15) have a predetermined resistance value, and the battery pack voltage is accordingly lowered to, for example, 200:1 to the output terminal (DEC). It will be printed.
- the second, fourth, and fifth resistors may have resistance values of 3M ⁇ , 1M ⁇ , and 20K ⁇ , respectively.
- the battery pack voltage of 800V is dropped and distributed through the second branch unit 200, relay unit 300, and voltage distribution unit 500 and output to the output terminal (DEC).
- the output value can be input to the analog-to-digital converter of the control unit (not shown), that is, the MCU.
- the relay switch S13 may be turned off by a predetermined control signal.
- the control unit (not shown) may output the first and second control signals CTRL1 and CTRL2 in a low state as the relay switch S13 is turned off. Accordingly, the first and second switches S11 and S12 may be turned off. In this way, the relay switch S13 and the first and second switches S11 and S12 are all turned off, thereby preventing leakage current through the relay resistor R13.
- leakage current may be generated through the relay resistance (R13) when the relay switch (S13) is turned off, but the relay switch (S13) is turned off.
- the first and second switches (S11, S12) also remain in the off state, thereby preventing the generation of leakage current through the relay resistor (R13).
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims (14)
- 배터리 팩 전압 측정을 제어하는 릴레이부;배터리 팩 전압 입력 단자와 상기 릴레이부 사이에 마련되며 상기 배터리 팩 전압에 따라 상기 배터리 팩 전압을 서로 다른 경로로 분기하여 상기 릴레이부로 공급하는 제 1 및 제 2 분기부; 및상기 제 1 또는 제 2 분기부와 릴레이부를 통해 공급되는 배터리 팩 전압을 분배하여 출력 단자로 출력하는 전압 분배부를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 1에 있어서, 상기 제 1 분기부는 상기 배터리 팩 전압 입력 단자와 상기 릴레이부 사이에 직렬 연결된 제 1 저항 및 제 1 스위치를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 2에 있어서, 상기 제 2 분기부는 상기 배터리 팩 전압 입력 단자와 상기 릴레이부 사이에 직렬 연결되며 상기 제 1 저항 및 상기 제 1 스위치와 각각 병렬 연결된 제 2 저항 및 제 2 스위치를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 3에 있어서, 상기 릴레이부는 제 1 및 제 2 분기부의 접속점과 상기 전압 분배부 사이에 병렬 연결된 릴레이 스위치 및 제 3 저항을 포함하는 배터리 팩 전압 측정 회로.
- 청구항 4에 있어서, 상기 제 1 스위치, 제 2 스위치 및 릴레이 스위치를 제어하는 제어부를 더 포함하는 배터리 팩 전압 측정 회로.
- 청구항 5에 있어서, 상기 제어부는 상기 배터리 팩 전압의 크기에 따라 상기 제 1 및 제 2 스위치를 선택적으로 개폐하는 배터리 팩 전압 측정 회로.
- 청구항 4에 있어서, 상기 전압 분배부의 저항들의 합과 상기 제 1 저항의 비인 제 1 저항비와, 상기 전압 분배부의 저항들의 합과 상기 제 2 저항의 비인 제 2 저항부기 서로 다르게 설정된 배터리 팩 전압 측정 회로.
- 배터리 팩 전압 입력 단자와 제 1 노드 사이에 마련되어 제 1 배터리 팩 전압을 분기하는 제 1 분기부;상기 배터리 팩 전압 입력 단자와 상기 제 1 노드 사이에 마련되고 상기 제 1 분기부와 병렬 연결되어 제 2 배터리 팩 전압을 분기하는 제 2 분기부;상기 제 1 노드와 제 2 노드 사이에 마련되고 스위칭 동작에 따라 상기 배터리 팩 전압의 측정을 제어하는 릴레이부; 및상기 제 2 노드와 접지 단자 사이에 마련되어 제 1 또는 제 2 분기부와 릴레이부를 통해 공급되는 배터리 팩 전압을 분배하여 출력 단자로 출력하는 전압 분배부를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 8에 있어서, 상기 제 1 분기부는 상기 배터리 팩 전압 입력 단자와 상기 제 1 노드 사이에 직렬 연결된 제 1 저항 및 제 1 스위치를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 9에 있어서, 상기 제 2 분기부는 상기 배터리 팩 전압 입력 단자와 상기 제 1 노드 사이에 직렬 연결되며 상기 제 1 저항 및 상기 제 1 스위치와 각각 병렬 연결된 제 2 저항 및 제 2 스위치를 포함하는 배터리 팩 전압 측정 회로.
- 청구항 10에 있어서, 상기 릴레이부는 상기 제 1 노드와 상기 제 2 노드 사이에 병렬 연결된 릴레이 스위치 및 제 3 저항을 포함하는 배터리 팩 전압 측정 회로.
- 청구항 11에 있어서, 상기 제 1 스위치, 제 2 스위치 및 릴레이 스위치를 제어하는 제어부를 더 포함하는 배터리 팩 전압 측정 회로.
- 청구항 12에 있어서, 상기 제어부는 상기 배터리 팩 전압의 크기에 따라 상기 제 1 및 제 2 스위치를 선택적으로 개폐하는 배터리 팩 전압 측정 회로.
- 청구항 11에 있어서, 상기 제 1 저항과 상기 제 2 저항의 저항값이 서로 다른 배터리 팩 전압 측정 회로.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23900806.3A EP4560333A4 (en) | 2022-12-05 | 2023-07-17 | BATTERY PACK VOLTAGE MEASUREMENT CIRCUIT |
| JP2025513034A JP2025527871A (ja) | 2022-12-05 | 2023-07-17 | バッテリーパック電圧の測定回路 |
| CN202380063426.9A CN119816742A (zh) | 2022-12-05 | 2023-07-17 | 电池组电压测量电路 |
| US19/108,960 US20260079186A1 (en) | 2022-12-05 | 2023-07-17 | Battery Pack Voltage Measurement Circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0167473 | 2022-12-05 | ||
| KR1020220167473A KR20240083388A (ko) | 2022-12-05 | 2022-12-05 | 배터리 팩 전압 측정 회로 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024122784A1 true WO2024122784A1 (ko) | 2024-06-13 |
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ID=91379527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2023/010223 Ceased WO2024122784A1 (ko) | 2022-12-05 | 2023-07-17 | 배터리 팩 전압 측정 회로 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20260079186A1 (ko) |
| EP (1) | EP4560333A4 (ko) |
| JP (1) | JP2025527871A (ko) |
| KR (1) | KR20240083388A (ko) |
| CN (1) | CN119816742A (ko) |
| WO (1) | WO2024122784A1 (ko) |
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| CN103344822A (zh) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | 一种用于电池供电设备的电池电压监测电路 |
| CN203350420U (zh) * | 2013-06-26 | 2013-12-18 | 天津成科自动化工程技术有限公司 | 一种用于电池供电设备的电池电压监测电路 |
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| KR20210126860A (ko) * | 2020-04-13 | 2021-10-21 | 에스케이이노베이션 주식회사 | 절연 저항 측정 장치 |
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| JP5893411B2 (ja) * | 2012-01-06 | 2016-03-23 | 日置電機株式会社 | 電圧測定装置および電圧測定方法 |
| JP6627732B2 (ja) * | 2016-12-07 | 2020-01-08 | 株式会社デンソー | 電源回路装置 |
| CN112578277B (zh) * | 2020-12-03 | 2025-09-26 | 湖北亿纬动力有限公司 | 动力电池系统预充电继电器粘连检测系统及检测方法 |
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2022
- 2022-12-05 KR KR1020220167473A patent/KR20240083388A/ko active Pending
-
2023
- 2023-07-17 JP JP2025513034A patent/JP2025527871A/ja active Pending
- 2023-07-17 US US19/108,960 patent/US20260079186A1/en active Pending
- 2023-07-17 EP EP23900806.3A patent/EP4560333A4/en active Pending
- 2023-07-17 WO PCT/KR2023/010223 patent/WO2024122784A1/ko not_active Ceased
- 2023-07-17 CN CN202380063426.9A patent/CN119816742A/zh active Pending
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| KR102041869B1 (ko) | 2013-05-21 | 2019-11-08 | 엘지이노텍 주식회사 | 배터리 팩의 전압 측정장치 및 배터리 제어 시스템 |
| CN103344822A (zh) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | 一种用于电池供电设备的电池电压监测电路 |
| CN203350420U (zh) * | 2013-06-26 | 2013-12-18 | 天津成科自动化工程技术有限公司 | 一种用于电池供电设备的电池电压监测电路 |
| KR20200054714A (ko) * | 2018-11-12 | 2020-05-20 | 삼성전자주식회사 | 배터리 셀의 전압을 측정하기 위한 경로를 선택하는 배터리 팩 및 전자 장치 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20240083388A (ko) | 2024-06-12 |
| US20260079186A1 (en) | 2026-03-19 |
| CN119816742A (zh) | 2025-04-11 |
| EP4560333A1 (en) | 2025-05-28 |
| EP4560333A4 (en) | 2026-03-25 |
| JP2025527871A (ja) | 2025-08-22 |
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