JP6764673B2 - Battery control device, battery module, battery pack, and battery control method - Google Patents

Description

The description of the present invention relates to the control of a battery cell or battery module.

When charging and discharging are repeatedly performed in a plurality of cells constituting a battery, there is a possibility that a chemical difference or an aging (aging or aging) difference between the cells may occur, and the chemical difference may occur. A voltage deviation or a capacitance deviation may occur between a plurality of cells due to a difference or a difference in aging. Therefore, a particular cell may be overcharged or overdischarged. As a result, the capacity of the battery can be reduced, the battery can be degraded and the battery life can be reduced.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a battery control device.

The battery control device according to the embodiment of the present invention includes a processing unit that defines each of the output values of the converters corresponding to the plurality of battery units based on the state information of each of the plurality of battery units, and the output value. Includes a signal generator that generates a control signal that controls the plurality of converters so that the corresponding power supplies the load.

The processing unit may calculate the state difference information of each of the plurality of battery units using the state information, and determine in advance whether or not the state difference information belongs to a certain range.

Based on the determined result, the processing unit may define the output value of the plurality of converters by using any one or both of the state difference information and the required power of the load.

When the state difference information does not belong to a certain range in advance, the processing unit determines whether or not the state difference information has a negative value, and the signal generation unit determines whether the state difference information has a negative value. If so, a control signal for controlling the converter corresponding to the battery unit may be generated in order to charge the battery unit having the state difference information having the negative value.

Each of the output values is a function of the state difference information of each of the plurality of battery units, and the state difference information may be calculated based on the state information.

The battery control device may further include a communication unit that transmits the control signal to the plurality of battery units.

The electric power corresponding to the output value may be supplied to the low voltage load among the low voltage load and the high voltage load.

The battery module according to the embodiment of the present invention externally defines the output value of the battery cell, the converter connected to the battery cell, and the converter defined based on the state information of the battery module and other battery modules. It includes a controller that receives from the controller and controls the converter to supply power corresponding to the output value to the load.

The output value is defined based on the state difference information of the battery module when the state information is out of the predetermined range, and the state difference information is the state information of the battery module and the other battery modules. It may be calculated based on.

The output value is a function of the state difference information of the battery module, and the state difference information may be calculated based on the state information of the battery module and the other battery modules.

The converter may control the battery cell based on the output value.

The electric power corresponding to the output value of the converter may be supplied to the low voltage load among the low voltage load and the high voltage load.

The battery module may be connected in series with the other battery module.

The battery module may include a first connector including a low voltage port connecting to the output end of the converter and a second connector connecting to the other battery module.

The battery pack according to the embodiment of the present invention defines an output value of the converter based on a plurality of battery modules, a plurality of converters corresponding to the plurality of battery modules, and state information of the plurality of battery modules. It includes a main controller that generates control signals that control each of the converters so that the power corresponding to the output value is supplied to the load.

The main controller calculates the state difference information of each of the plurality of battery modules using the state information of the plurality of battery modules, and the state difference information of each of the plurality of battery modules belongs to a certain range in advance. You may decide whether or not.

Based on the determined result, the main controller may define the output value of each of the plurality of converters by using at least one of the state difference information and the required power of the load.

Each of the plurality of battery modules may include a sub-controller that controls the converter to supply power corresponding to each of the output values to the load.

Each of the output values is a function of the state difference information of each of the plurality of battery modules, and the state difference information may be calculated based on the state information of each of the plurality of battery modules.

It further includes a first bus that supplies high-voltage power output from the plurality of battery modules to a high-voltage load, and a second bus that supplies low-voltage power output from the plurality of battery modules to a low-voltage load. The high voltage power may be power not converted by the converter, and the low voltage power may be power converted by the converter based on the output value.

Each of the converters may be connected in parallel with each other.

The plurality of battery modules may be connected in series.

The battery control method according to the embodiment of the present invention includes a step of defining each of the output values of a plurality of converters corresponding to the plurality of battery units based on the state information of the plurality of battery units, and the output values. It includes generating a control signal that controls the plurality of converters to supply the corresponding power to the load.

The steps for defining each of the output values are a step of calculating the state difference information of each of the plurality of battery units using the state information and determining whether or not the state difference information belongs to a certain range in advance. It may include a step to do.

The step of defining each of the output values defines the output values of the plurality of converters using either one or both of the state difference information and the required power of the load based on the determined result. It may include steps.

Each of the steps defining the output values includes a step of determining whether the state difference information has a negative value when the state difference information does not belong to a certain range in advance, and a step of generating the control signal includes a step of generating the control signal. When the state difference information has a negative value, a step of generating a control signal for controlling a converter corresponding to the battery part in order to charge the battery unit having the state difference information having the negative value may be included.

Each of the output values is a function of the state difference information of each of the plurality of battery units, and the state difference information may be calculated based on the state information of the plurality of batteries.

The step of transmitting the control signal to the plurality of battery units may be further included.

The electric power corresponding to the output value may be supplied to the low voltage load among the low voltage load and the high voltage load.

The apparatus of one embodiment of the present invention includes a battery pack including a plurality of battery modules and a plurality of converters electrically connected to the plurality of battery modules, and the battery pack is electrically connected to the battery pack via the plurality of converters. Includes a low power load connected to the battery pack and a high power load electrically connected to the battery pack by bypassing the plurality of converters.

The state difference information of each of the plurality of battery modules is acquired by using the state information of the plurality of battery modules, and it is determined in advance whether or not the state difference information belongs to a certain range, and the determined result is obtained. Based on this, it may further include a main controller that defines the output values of the plurality of converters using at least one of the state difference information and the required power of the low power load.

The main controller transmits the output value to the plurality of battery modules, and each of the plurality of battery modules supplies power corresponding to each of the output values to the low power load. It may include a sub-controller that controls the converter.

The battery control device according to an embodiment of the present invention includes a plurality of batteries and a plurality of converters (each of the plurality of converters is connected to each of the plurality of batteries, and power is supplied to the load from each of the plurality of batteries. (Supply) and a processor that defines each of the output powers of the plurality of converters that equalize the charge states of the plurality of batteries (each of the output powers is in the respective charge states of the plurality of batteries. (Defined based on) and a signal generator that generates each of the control signals for controlling the plurality of converters to supply each of the output powers to the load.

A main controller including the processor and the signal generation unit, and a plurality of battery modules are further included, and the plurality of battery modules include one of the plurality of batteries, a converter connected to the one, and a sub controller. The main controller further includes, the main controller transmits the control signal to the plurality of battery modules, the sub controller receives one of the control signals from the main controller, and the output power to the load. The converter may be controlled to supply one of them.

The plurality of battery modules may be connected to each other so that the plurality of batteries are connected in series with each other and the plurality of converters are connected in parallel with each other.

The processor may define the output power of each of the plurality of converters based on the required power of the load and the charge state of each of the plurality of batteries.

The processor divides the required power of the load into the number of the plurality of batteries to calculate the average power, averages the charge states of the plurality of batteries to calculate the average charge state, and calculates the average power and the average. The output power of each of the plurality of converters may be defined based on the state of charge.

The processor subtracts the charging states of the plurality of batteries from the average charging state to calculate the charging status difference information of each of the plurality of batteries, and the charging status difference information of the plurality of batteries is within a certain range in advance. If the charge state difference information is within a certain range in advance, the output power of each of the plurality of converters is defined so as to be the average power, and one of the charge state difference information is used. If it is out of a certain range in advance, the output power of each of the plurality of converters may be defined so as to be the sum of the average power multiplied by the charge state difference information and the average power.

One embodiment of the present invention can compensate for the unevenness or imbalance of charging states that occurs in a plurality of batteries.

It is a figure for demonstrating the battery control device which concerns on one Embodiment of this invention. It is a figure for demonstrating the battery control device which concerns on one Embodiment of this invention. It is a figure for demonstrating the battery module which concerns on one Embodiment of this invention. It is a figure for demonstrating an example of the battery module which concerns on one Embodiment of this invention. It is a figure for demonstrating another example of the battery module which concerns on one Embodiment of this invention. It is a block diagram for demonstrating the battery pack which concerns on one Embodiment of this invention. It is a figure for demonstrating the battery pack which concerns on one Embodiment of this invention. It is a figure for demonstrating the power supply which concerns on one Embodiment of this invention. It is a figure for demonstrating the converter package included in the battery pack which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the battery control method which concerns on one Embodiment of this invention. It is a figure for demonstrating the user interface for providing the battery state information which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The specific structural or functional description below is exemplified solely for the purpose of explaining embodiments and should not be construed as limiting the scope of this application to what is described in the text. It doesn't become.

The terms used in the embodiments of the present invention are not intended to limit the embodiments as they are merely used to describe a particular embodiment. A singular expression includes multiple expressions unless they have distinctly different meanings in the context. In the present specification, terms such as "including" or "having" are intended to specify the existence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification. It must be understood that one or more other features, numbers, steps, actions, components, parts, or combinations thereof do not preclude the possibility of existence or addition. It doesn't become.

Unless defined as a difference, all terms used herein, including technical or scientific terms, are the same as those commonly understood by those with ordinary knowledge in the technical field to which the embodiment belongs. It has meaning. Commonly used, pre-defined terms should be construed as having a meaning consistent with that in the context of the relevant technology and are ideal unless expressly defined in this application. It cannot be interpreted as having or overly formal meaning.

Further, in the description with reference to the attached drawings, the same components are given the same reference numerals regardless of the drawing reference numerals, and duplicate description thereof will be omitted. When it is determined in the description of the embodiment that the specific description of the related known art unnecessarily obscures the gist of the embodiment, the detailed description thereof will be omitted.

1A and 1B are diagrams for explaining a battery control device according to an embodiment of the present invention.

Referring to FIG. 1A, the battery control device 100 according to one embodiment includes a processing unit 110 and a signal generation unit 120.

The processing unit 110 acquires detection data of a plurality of battery units. Each of the plurality of battery units may indicate a battery module or a battery cell. When each of the plurality of battery units is a battery module, each battery module may include one or a plurality of battery cells. A plurality of battery cells included in a battery module may be connected in series with each other.

The battery control device 100 receives detection data from each of the plurality of battery units. The detection data may include, for example, any one of the voltage data, the current data, the temperature data, and the impedance data of the battery unit, or a combination thereof. In one embodiment of the present invention, each of the plurality of battery units may include a controller. The controller generates a control signal for detecting any one or a combination of the voltage, current, temperature, and impedance of the battery unit. The detection data of the battery unit may be generated based on the control signal of the controller, and the controller may transmit the detection data to the battery control device 100.

The controller included in each of the battery control device 100 and the plurality of battery units may be in a master-slave relationship. The battery control device 100 transmits a command to a controller included in each of the plurality of battery units as a master. The controller can operate as a slave by transmitting an instruction from the battery control device 100.

The processing unit 110 acquires the state information of each of the plurality of battery units based on the detection data of each of the plurality of battery units. The state information may include, for example, one or a combination of a charged state (State of Charge: SoC), a deteriorated state (State of Health: SoH), and a capacity. The processing unit 110 may store the state information and / or the detection data of each of the plurality of battery units in the memory.

The processing unit 110 defines the output value of the converter corresponding to each of the plurality of battery units based on the state information of the plurality of battery units. The converter may be a DC / DC converter and may be an isolated converter. Further, the converter may be a unidirectional converter or a bidirectional converter. The type of converter described above is merely an exemplary item according to an embodiment of the present invention, and the type of converter is not limited to the items described above.

The processing unit 110 acquires the state difference information of each of the plurality of battery units by using the state information of each of the plurality of battery units. As an example, the processing unit 110 can calculate an average SoC (SoC _average ) based on the respective SoCs of the plurality of battery units, and shows the difference between each SoC and the SoC _average of the plurality of battery units. ΔSoC can be calculated. For example, the processing unit 110 may calculate ΔSoC _{n of the} battery unit having the index n.

The processing unit 110 acquires the required power ( _PLDC ) of the low voltage load. Further, the processing unit 110 may calculate the average required power ( _{PLDC_avage} ) of the low voltage load.

The processing unit 110 determines whether or not the state difference information belongs to the first range. Further, the processing unit 110 defines each output value (P _{Target_n} ) of the converter using the state difference information and / or the required power of the low voltage load based on the determined result. Therefore, since the output values of the converters can be defined to be different from each other, the battery unit in which a relatively large amount of power is stored can supply more power to a low power load, and the power is relative. The less stored battery unit can supply less power to the low power load. Therefore, the states of the plurality of battery units can be equal.

In one embodiment of the present invention, if the state difference information is 0.01 or less, the processing unit 110 _may determine the _{P Target_n} based on _{P LDC_average.} When the state difference information exceeds 0.01, the processing unit 110 can define P _{Target_n} as _{PLDC_avage} + P _{LDC_avage} ^* _{ΔSoC n} . When the state difference information _{ΔSOC n} has an absolute value of 0.01 or less, P _{Target_n} is the same as _{PLDC_avage} , and when the state difference information _{ΔSOC n} has an absolute value exceeding 0.01, P _{Target_n} is P. It is a function of _{LDC_avage} and _{ΔSOC n} . A specific description will be given with reference to FIG. 1B. However, the above-mentioned 0.01 is only an exemplary matter, and other values may be used.

With reference to FIG. 1B, the respective output values of the converter are shown.

When the SoCs of the plurality of battery units are substantially the same, the output values of the converters can be substantially the same. It is assumed that _PLDC = 30W. In the example shown in FIG. 1B, the number of converters is three. _{PLDC_avage} = _30/3 = 10W. As in the example shown on the left side of FIG. 1B, △ when the absolute value of the SoC _n is 0.01 or less, each of the output values of the _converter, it may be defined as _{P LDC_average.} Each of the plurality of converters can supply 10 W to a low voltage load.

Over time, differences between SoC ₁ , SoC ₂ , and SoC ₃ can occur. In this case, if the output values of the converters are defined to be substantially the same, the SoC unevenness of the plurality of battery units may continue. Therefore, a particular battery unit can be over-discharged and damaged. Further, when a plurality of battery units are charged while the SoC unevenness of the plurality of battery units is maintained, the specific battery unit cannot be buffered, and the energy utilization rate of the plurality of battery units may decrease. .. In other words, if a plurality of battery units are charged and discharged while the SoC unevenness of the plurality of battery units is maintained, the plurality of battery units may be damaged, the life may be shortened, and energy utilization may be performed. The rate can decrease.

According to an embodiment of the present invention, in order to compensate for unequal of the plurality of battery of SoC, △ when the absolute value of the SoC _n is more than 0.01, the respective output values of the _{converter, P LDC_average} + _P It can be defined as _{LDC_battery} ^* ΔSoCn. In the case of the example shown on the right side of FIG. 1B, the output values of the converters may be defined to be different from each other.

For example, suppose SoC ₁ = 0.53, SoC ₂ = 0.75, and SoC ₃ = 0.46.

SoC _average = (0.53 + 0.75 + 0.46) / 3 = 0.58.

ΔSoC ₁ = −0.05, ΔSoC ₂ = 0.17, and ΔSoC ₃ = −0.12, and the absolute value of ΔSoC _n is 0.01 or more. In this case, the processing unit 110 _may define a P _{Target_1 to P Target_3} as follows.

P _{Target_1} = 10 + 10 ^* (-0.05) = 9.5W

P _{Target_2} = 10 + 10 ^* (0.17) = 11.7W

P _{Target_3} = 10 + 10 ^* (-0.12) = 8.8W

The battery unit _2 corresponding to SoC ₂ can supply more than the average required power to the low voltage load, and the battery unit _1 corresponding to SoC ₁ and the battery unit _3 corresponding to SoC ₃ have lower average required power or less. It can be supplied to a voltage load. Therefore, the unequalities of SoC ₁ , SoC ₂ , and SoC ₃ can be compensated. Therefore, even if the charging and discharging cycles of the plurality of battery units increase, the specific battery unit may not be over-discharged. In addition, the energy utilization rate of the plurality of battery units increases, and the plurality of battery units can be used for a long time.

_{Even if} each of P _{Target_1 to} P _{Target_3} is defined to have a different value from each other, the total of P _{Target_1 to} P _{Target_3} is 30 _W. In other words, the processing unit 110 is defined so that each of P _{Target_1 to} P _{Target_3} is different from each other, but each of P _{Target_1 to} P _{Target_3} can be defined so as to satisfy the required power of the load. _{Even if} each of P _{Target_1 to} P _{Target_3} is defined to have different values, a constant amount of power is supplied to the low voltage load.

△ SoC _1, △ also SoC _2, and △ 1 or 2 of the absolute value of the SoC ₃ is in excess of 0.01, respective output values of the plurality of _converters, a ^{_{P LDC_average + P LDC_average * △ SoC}} n Can be defined. Further, at least one absolute value predetermined value among the plurality of △ SoC _n (e.g., 0.01) if it exceeds, respective output values of the plurality of ^{_{converters, P LDC_average + P LDC_average * △}} SoC n Can be defined as.

In one embodiment of the present invention, the processing unit 110 determines whether or not the state difference information has a negative value when the state difference information does not belong to the first range. In the examples described above, ΔSoC ₁ (−0.05) and ΔSoC ₃ (−0.12) have negative values. The processing unit 110 can set the state difference information having a negative value to 0. In other words, when ΔSoC _n <0, the processing unit 110 may set _{ΔSoC n} to 0, or may determine _{PTarget_n} based on the setting. In the examples described above, P _{Target_1} and P _{Target_3} may be defined as 10W rather than 9.5W and 8.8W, and P _{Target_2} may be 11.7W. In this _case, the sum of _{P Target_n} is a 31.7W, may exceed the _{P LDC} of 30 W. If the sum of P _{Target_n} exceeds _{P LDC,} power to be exceeded, the auxiliary power storage unit is supplied to the auxiliary power storage unit can be charged.

Further, when the state difference information has a negative value, the processing unit 110 does not set the state difference information having a negative value to 0, but charges the battery unit having the state difference information having a negative value. And may generate a control signal to control the corresponding converter. When ΔSoC _n has a negative value, it means that the power stored in the battery unit _n is likely to be smaller than the power stored in the other battery unit, so that the processing unit 110 charges the battery unit _n. You may generate a control signal to do so. Therefore, the battery unit_n can be charged, and the SoC unevenness of the plurality of battery units can be compensated.

Referring to FIG. 1A again, the signal generation unit 120 generates a control signal for controlling each of the converters so that the output value of the converter corresponding to each of the plurality of battery units and the corresponding power are supplied to the low power load. To do. As an example, the signal generation unit 120 may generate a control signal based on P _{Target_n} . In other words, the battery control device 100 can perform cell balancing by defining the output values of the converters so as to be different from each other.

The battery control device 100 may further include a communication unit (not shown). The communication unit transmits the control signal generated by the signal generation unit 120 to each of the plurality of battery units. As an example, the communication unit may transmit a control signal via a CAN (Control Area Network) system, a 1-wire system, or a 2-wire system. The communication method of the communication unit described above is merely an example, and the communication method of the communication unit is not limited to the above description.

FIG. 2 is a diagram for explaining a battery module according to an embodiment of the present invention.

Referring to FIG. 2, the battery module 200, one or more battery cells 210, a converter 220, a controller 230, a first connector 240, and a second connector (250 and 251) according to an embodiment are included.

The battery cell 210 stores power. When there are a plurality of battery cells 210, the battery cells 210 may be connected in series.

The converter 220 is electrically connected to the battery cell 210. The converter 220 can control any one or a combination of the output current, the output voltage, and the output power of the battery cell 210.

The converter 220 may be a bidirectional converter. In this case, the battery module 200 has the structure shown in FIG. In the structure shown in FIG. 3, the battery cell 310 is charged by the operation of the bidirectional converter 320.

Further, the converter 220 may be an isolated converter. The insulation converter may include, for example, a forward converter. The structure of the battery module including the forward converter is shown in FIG. Unlike the battery cell of FIG. 3, the battery cell 310 is not charged by the operation of the forward converter 420. Referring to FIG. 4, the controller 410 can generate a gate drive signal based on the control signal received from the external controller and can transmit the gate drive signal to the converter 420. The switch included in the converter 420 can operate on the basis of a gate drive signal. When a gate drive signal is applied to the switch, the switch is turned on and current flows through the primary winding of the converter 420. If a current flows through the primary winding, an induced current flows through the secondary winding by mutual induction. An output current corresponding to the output value of the converter 420 can be output based on the induced current flowing through the secondary winding.

The controller 230 controls the converter 220 to communicate with the external controller via the receive port 242 and the transmit port 243 included in the first connector 240. In addition, the controller 230 can transmit the detection data of the battery cell 210 to the external controller.

Since the external controller corresponds to the battery control device described in FIG. 1, detailed description of the external controller will be omitted.

The controller 230 receives the output value of the converter 220 defined based on the state information of the battery module 200 and other battery modules from the external controller. Further, the controller 230 controls the converter 220 so that the electric power corresponding to the output value of the converter 220 is supplied to the load. The controller 230 can control the converter 220 based on the control signal, and the converter 220 can control the battery cell 210 so that the power corresponding to the output value is supplied to the low voltage load.

The output end of the converter 220 is connected to the low voltage port (12V _DC port) 241 and the ground port 244 included in the first connector 240. The power output from the converter 220 may be supplied to a low voltage load. The low voltage load may include, for example, a system capable of operating at a low voltage of 12 V, such as the temperature control system or attitude control system of the moving body. Further, the low voltage load may include an auxiliary power storage unit, and the power output from the converter 220 may be stored in the auxiliary power storage unit.

The second connectors (250 and 251) of the battery module 200 are connected to the second connectors of other battery modules. The battery module 200 and other battery modules can be connected in series and can power high voltage loads under the control of an external controller. The high voltage load may include, for example, any one or a combination of the mobile motor, the inverter, and the vehicle-mounted charger.

FIG. 5 is a block diagram for explaining a battery pack according to an embodiment of the present invention. Referring to FIG. 5, the battery pack 500 according to an embodiment of the present invention includes a plurality of battery modules (510 to 530) and a main controller 540. The battery pack 500 also includes a converter (see FIG. 2) corresponding to each of the plurality of battery modules.

Each of the plurality of battery modules (510 to 530) may include one or more battery cells and subcontrollers.

The converter corresponding to each of the plurality of battery modules (510 to 530) may be a DC / DC converter or an isolated converter. The converter converts the power stored in the battery cell to match the operating voltage of the low voltage load (eg 12V). The converter may be located inside the battery module or outside the battery module.

The sub controller transmits the detection data of the battery module to the main controller 540. The main controller 540 defines the output value of the converter corresponding to each of the plurality of battery modules based on the status information of the plurality of battery modules. Since it has been described above that the output value of the converter is defined by confirming whether or not the state difference information belongs to the first range, detailed description thereof will be omitted. In the following, it will be described that the main controller 540 confirms other information and defines the output value of the converter.

The main controller 540 may define the output value of the converter by determining whether the SoC _n is within the second range. The second range may be SoC _average ^* (1-a) or more and SoC _average ^* (1 + a) or less. Here, a is an arbitrary constant, and may be, for example, 0.01. In the example described in FIG. 1B, the second range may be 0.57 (= 0.58 ^* 0.99) ≤ SoC _n ≤ 0.59 (= 0.58 ^* 1.01). Further, the main controller 540 may determine the maximum value and the minimum value from SoC _{1 to} SoC _N , and determine whether the difference between the maximum value and the minimum value is equal to or more than a predetermined range and convert the converter. The output value of may be defined. If the SoC _n does not belong to the second range, or if the difference between the maximum value and the minimum value is greater than or equal to a predetermined range, the main controller 540 defines P _{Module_n} as P _{LDC_avage} + P _{LDC_avage} ^* △ SoC _n. Therefore, it is possible to compensate for the unevenness of the state information of the plurality of battery modules (510 to 530).

The output value of the converter may be defined based on the capacity of the battery module instead of the SoC of the battery module. For example, the main controller _{540, Capacity n -Capacity average = △ Capacity} n may be used, △ Capacity when _n is greater than _0.01, may be defined _{P Target_n} based on _{P LDC_average} ^* △ Capacity _n .. Further, the main controller 540, △ based on SoC _n and △ Capacity _n may define _{P Target_n.} The definition of the output value of the converter described above is merely an example, and the definition of the output value of the converter is not limited to the above description.

The main controller 540 generates control signals that control each of the converters so that the power corresponding to the output value is supplied to the load. In addition, the main controller 540 can transmit each of the control signals to a plurality of battery modules (510 to 530). The sub-controller included in each of the plurality of battery modules (510 to 530) can control the converter based on the control signal. The sub-controller can control the converter so that the load is powered according to the defined output value.

In the battery pack 500, the bus 560 that supplies power to the low voltage load 570 and the bus 550 that supplies power to the high voltage load 580 are classified. In FIG. 5, the bus 550 is represented by a thick solid line, and the bus 560 is represented by a dotted line. A plurality of battery modules (510 to 530) connected in series are connected to the bus 550. The plurality of battery modules (510 to 530) supply power to the high voltage load 580 without converting the power stored in the battery cells contained in each of the plurality of battery modules (510 to 530). can do. In addition, the plurality of battery modules (510 to 530) can step down the power stored in the battery cell from high voltage to low voltage via the corresponding converter, and the stepped down power is transferred to the low voltage load 570. Can be supplied.

Since the matters described in FIGS. 1 to 4 can be applied to the matters described in FIG. 5, detailed description thereof will be omitted. The matters described in FIG. 5 may be applied to the matters described in FIGS. 1 to 4.

FIG. 6 is a diagram for explaining a battery pack according to an embodiment of the present invention. Referring to FIG. 6, the battery pack 600 according to an embodiment of the present invention includes a plurality of battery modules (610 to 630) and a main controller 640.

Each of the plurality of battery modules (610-630) may include a converter (611, 621, or 631) and a sub-BMS (Battery Management System) / controller. Each of the sub-BMS / controllers can manage any one or a combination of the voltage, current, temperature, and impedance of each of the plurality of battery modules (610 to 630). The converter 611, converter 621, and converter 631 can be connected in parallel.

Each of the plurality of battery modules (610 to 630) may be the battery module described in FIG. Further, each of the plurality of battery modules (610 to 630) may be the battery module described in FIG. 3 or FIG.

The main controller 640 may include a main BMS 641, the main BMS 641 may include an SPI (Serial Peripheral Interface), and may be connected to a network via the main BMS 641 SPI to form a plurality of battery modules (610 to 630). It is possible to communicate with the sub BMS / sub controller included in each. The main BMS641 may transmit a control signal for controlling the converters (611, 621, and 631) via communication to the sub BMS / controller included in each of the plurality of battery modules (610 to 630). Each sub-BMS / controller may control each of the converters (611, 621, and 631) based on the control signal.

The main controller 640 is connected to the junction box 650. The junction box 650 can relay the low voltage power and the high voltage power output by each of the plurality of battery modules (610 to 630). The relay 651 included in the junction box 650 can transmit low voltage power to either one or both of the auxiliary power storage and the low voltage load, and the fuse box / relay 652 included in the junction box 650. Can transmit the high voltage power transmitted from the main relay / current sensor 642 to the high voltage load.

Since the matters described in FIGS. 1 to 5 can be applied to FIG. 6, detailed description thereof will be omitted.

FIG. 7 is a diagram for explaining power supply according to an embodiment of the present invention. Referring to FIG. 7, P _{Target_1} indicates the output power of the converter 711, P _{Target_2} indicates the output power of the converter 721, and P _{Target_3} indicates the output power of the converter 731.

The output values of the plurality of converters (711, 721, and 731) may be defined to be different from each other. Therefore, different powers can be output from the plurality of converters (711, 721, and 731). In this case, the total power output by the plurality of converters may not be the same as the _PLDC . If the total power output by the plurality of converters is greater than P _LDC, power in excess of P _LDC may be used to charge the auxiliary power storage unit. If the total power output by the plurality of converters is less than P _LDC, power to compensate for the difference between the sum P _LDC power output by the plurality of converters, auxiliary power storage unit is in the low power loads May be supplied.

FIG. 8 is a diagram for explaining a converter package included in the battery pack according to the embodiment of the present invention.

In the case of the example shown in FIG. 6, the individual battery module includes a converter and a sub BMS / sub controller. Unlike the example shown in FIG. 6, the converter and the sub BMS / sub controller may be included in the battery module. The plurality of converters (810-830) and the plurality of sub-BMS / sub-controllers may be realized in a single package. Here, the single package may be a physical device. An example of a single package is the converter package 800 shown in FIG. The controller 840 is a plurality of sub-BMS / sub-controllers shown in FIG. 6 realized by one physical device.

The converter package 800 may be located in the battery pack at a location physically separated from the plurality of battery modules.

Each of the plurality of converters (810-830) is connected to a corresponding battery module or battery cell. The output end of the first battery module is connected to the converter 810 via input ₁ (Input ₁ ), the output end of the second battery module is connected to the converter 820 via input ₂ (Input ₂ ), and the Nth battery module The output end of is connected to the converter 830 via an input _N (Input _N ).

Each of the plurality of converters (810-830) can be connected in parallel and can power the auxiliary power storage unit 850 and / or the low voltage load via the low voltage port. It is connected to the converter 830 via the ground end of the battery module and the input ground terminal (Gnd ₁ ).

Since the matters described in FIGS. 1 to 7 can be applied to the matters described in FIG. 8, detailed description thereof will be omitted.

FIG. 9 is a flowchart for explaining a battery control method according to an embodiment of the present invention.

The battery control method according to the embodiment of the present invention can be performed by a battery control device.

Referring to FIG. 9, the battery control device defines each of the output values of the plurality of converters corresponding to the plurality of battery units based on the state information of the plurality of battery units (S910).

The battery control device generates a control signal that controls a plurality of converters to supply power corresponding to the defined output value (S920).

The battery control device transmits a control signal to a plurality of converters (S930). For example, the battery control device may transmit a control signal to a controller included in each of the plurality of battery units.

Since the matters described in FIGS. 1 to 8 can be applied to the matters described in FIG. 9, detailed description thereof will be omitted.

FIG. 10 is a diagram for explaining a user interface for providing battery status information according to an embodiment of the present invention. With reference to FIG. 10, the electric mobile body 1010 includes a battery system 1020.

The battery system 1020 includes a plurality of battery units 1030 and a battery control device 1040.

The plurality of battery units 1030 may include a battery module or a battery cell.

If the charge / discharge cycle of a battery pack having a performance deviation (for example, voltage difference or capacity difference) between a plurality of battery units 1030 is repeated, overcharge and overdischarge may occur. The life of the plurality of battery units 1030 may be shortened due to deterioration of the plurality of battery units 1030.

The battery control device 1040 can enable the plurality of battery units 1030 to operate in an optimum state based on information such as voltage, current, and / or temperature of the plurality of battery units 1030. For example, the battery control device 1040 can allow the plurality of battery units 1030 to operate at an optimum temperature, or can maintain the SoCs of the plurality of battery units 1030 at an appropriate level.

In one embodiment of the present invention, the battery control device 1040 can determine whether the state information of the plurality of battery units 1030 is equal. Further, when the state information of the plurality of battery units 1030 is uneven, the battery control device 1040 can make it possible to generate electric power corresponding to the state difference information generated by the unevenness, and the generated electric power. Can be used as a power source for low voltage loads. By using the state difference information generated by the unevenness, the balance of the plurality of battery units 1030 can be effectively performed, which increases the life of the plurality of battery units 1030.

Further, the battery control device 1040 can generate information for safe operation of the battery system 1020, and can transmit the information for safe operation to the terminal. For example, the battery control device 1040 may transmit the deterioration state, performance information, and / or replacement time of the plurality of battery units 1030 to the terminal 1050.

In one embodiment of the present invention, the battery control device 1040 can receive a trigger signal from the terminal 1050 via a wireless interface, and estimates the state information (for example, a deteriorated state) of the battery unit 1030 based on the trigger signal. can do. The battery control device 1040 can transmit the status information to the terminal 1050 using the wireless interface. The terminal 1050 may display the status information of the battery unit 1010 using the user interface 1060.

Since the matters described in FIGS. 1 to 9 can be applied to the matters described in FIG. 10, detailed description thereof will be omitted.

LDC (Low-voltage DC / DC Converter) required to charge an auxiliary battery included in an electric mobile body (for example, an electric vehicle) or an energy storage system via a battery control device according to an embodiment of the present invention. May be substituted. Further, the LDC required to supply power to a device or subsystem containing a 12 _VDC voltage included in an electric mobile body or the like via a battery control device according to an embodiment of the present invention may be substituted. ..

1A to 10A, the battery control device 100, the processing unit 110, the signal generation unit 120, the controller 230 in FIG. 2, the controller 330 in FIG. 3, the controller 410 in FIG. 4, and FIG. The main controller 540, the main BMS 641 and the sub BMS / sub controller of FIG. 6, the controller 840 of FIG. 8, the battery control device 1040 of FIG. 10, the terminal 1050, and the user interface 1060 may be embodied by hardware components.

Further, the battery control device according to the embodiment of the present invention can control the electric power corresponding to the difference in capacity and / or SoC between the battery modules, and the battery pack or the battery module including the battery control device can be used. It may be made smaller or lighter.

The method according to this embodiment is embodied in the form of program instructions implemented via various computer means and recorded on a computer-readable recording medium. The recording medium includes program instructions, data files, data structures, etc. alone or in combination. The recording medium and program instructions may be specially designed and configured for the purposes of the present invention, or may be known and usable by those skilled in the art of computer software. .. Examples of computer-readable recording media include hard disks, magnetic media such as floppy (registered trademark) disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, and magnetic-optical such as floppy disks. Includes media and hardware devices specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language code generated by a compiler, but also high-level language code executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the present invention and vice versa.

As described above, although the embodiments have been described by the limited drawings, various technical modifications and modifications can be applied based on the above description by anyone having ordinary knowledge in the art. .. As an example, the techniques described may be performed in a different order than the methods described, and / or components such as the described systems, structures, devices, circuits, etc. may be combined or combined in a different manner than the methods described. Appropriate results can be achieved even if substituted or replaced by other components or equivalents.

Therefore, the scope of the present invention is not limited to the disclosed embodiments, but is defined by the scope of claims and the equivalent of the scope of claims.

100, 1040: Battery control device 110: Processing unit 120: Signal generation unit 200, 510-530, 610-630: Battery module 210, 310: Battery cell 220, 320, 420, 611, 621, 631, 711, 721, 731, 810-830: Converter 230, 330, 410, 840: Controller 240: First connector 241: Low voltage port 242: Receive port 243: Transmission port 244: Ground port 250, 251: Second connector 500, 600: Battery Pack 540, 640 Main controller 550, 560: Line 570: Low voltage load 580: High voltage load 641: Main BMS
642: Main relay / current sensor 650: Junction box 651: Relay 652: Fuse box / relay 800: Converter package 850: Auxiliary power storage unit 1010: Electric mobile body 1020: Battery system 1030: Battery unit 1040: Battery control device 1050: Terminal 1060: User interface

Claims (16)

It is a battery control device
The state information of each of the batteries connected in series is determined based on the detection data of each of the batteries, it is determined whether or not the state information corresponds to the uneven state, and the state information corresponds to the uneven state. If so, it includes a processor that performs equalization procedures on at least one of the batteries.
In the equalization procedure, the processor controls the first and second batteries to supply different powers to the load while the first and second batteries in the non-uniform state are discharged, and the first. Control the first and second batteries to be supplied with different powers while the first and second batteries are being charged.
Battery control device. In the processor, when the charge state of the first battery is far from the reference, the charge state of the second battery is close to the reference, and the SOC of the first battery is larger than the SOC of the second battery, the first. The battery control device according to claim 1 , wherein the first battery controls to supply more power to the load than the second battery while the second battery is discharged . The battery control device according to claim 2, wherein the reference is determined based on the average of the charging states of the batteries. In the processor, when the charge state of the first battery is far from the reference, the charge state of the second battery is close to the reference, and the SOC of the first battery is smaller than the SOC of the second battery, the first. and between the second battery is discharged, the second battery is controlled to provide more power than the first battery to the load, the battery control device according to claim 1. The battery control device according to claim 1 , wherein the processor determines the amount of power supplied by the first battery based on the state difference information of the first battery and the required power of the load . The battery control device according to claim 5 , wherein the processor determines the state difference information of the first battery based on the average of the state information of each of the batteries and the state information of the first battery . Wherein the processor determines the amount of power supplied by the second battery based on the second battery state difference information and required power of the load, wherein the battery control device according to claim 1. The battery control device according to claim 7 , wherein the processor determines the state difference information of the second battery based on the average of the state information of each of the batteries and the state information of the second battery . It ’s a battery control method.
A step of determining the status information of each of the batteries connected in series based on the detection data of each of the batteries, and
The step of determining whether or not the state information corresponds to an uneven state, and
When the state information corresponds to the uneven state, a step of performing an equalization procedure for at least one of the batteries, and
Including
The step of performing the equalization procedure is
A step of controlling the first and second batteries to supply different powers to the load while the first and second batteries in the uneven state are discharged.
A step of controlling the first and second batteries to be supplied with different powers while the first and second batteries are being charged.
Battery control methods, including. In the step of controlling the first and second batteries to supply different powers to the load while the first and second batteries are discharged, the state of charge of the first battery is far from the reference, and the second. When the state of charge of the battery is close to the reference and the SOC of the first battery is larger than the SOC of the second battery, the first battery is the second battery while the first and second batteries are discharged. The battery control method according to claim 9, further comprising a step of controlling to supply more power to the load. The battery control method according to claim 10, wherein the reference is determined based on an average of the charging states of each of the batteries. In the step of controlling the first and second batteries to supply different powers to the load while the first and second batteries are discharged, the state of charge of the first battery is far from the reference, and the second. When the state of charge of the battery is close to the reference and the SOC of the first battery is smaller than the SOC of the second battery, the second battery is the first battery while the first and second batteries are discharged. The battery control method according to claim 9, further comprising a step of controlling to supply more power to the load. The battery control method according to claim 9, further comprising a step of determining the amount of electric power supplied by the first battery based on the state difference information of the first battery and the required power of the load. The battery control method according to claim 13, further comprising a step of determining the state difference information of the first battery based on the average of the state information of each of the batteries and the state information of the first battery. The battery control method according to claim 9, further comprising a step of determining the amount of power supplied by the second battery based on the state difference information of the second battery and the required power of the load. The battery control method according to claim 15, further comprising a step of determining the state difference information of the second battery based on the average of the state information of each of the batteries and the state information of the second battery.