KR101659126B1 - Apparatus and method for determining synchronization of measurement of cell modules - Google Patents

Abstract

The present invention relates to an apparatus and method for determining a measurement synchronization between cell modules. More particularly, the present invention relates to an apparatus and method for determining a measurement synchronization between cell modules, And more particularly, to a device and method for determining a measurement synchronization between cell modules that can determine whether or not voltage measurement between a plurality of cell modules is synchronized based on whether a voltage change measurement time point between a plurality of modules is consistent based on a measured measurement value.

Description

[0001] Apparatus and method for determining synchronization of measurement between cell modules [0002]

The present invention relates to an apparatus and method for determining a measurement synchronization between cell modules. More particularly, the present invention relates to an apparatus and method for determining a measurement synchronization between cell modules, And more particularly, to a device and method for determining a measurement synchronization between cell modules that can determine whether or not the voltage change measurement is synchronized based on whether or not the measurement time of the voltage change between a plurality of modules coincides with the reported measured value.

Generally, a battery is also referred to as a battery or a secondary battery. A battery (e.g., sulfuric acid) existing in a battery is electrolyzed by a chemical action using two plates such as a copper plate and a zinc plate, , And means a storage device that stores or outputs such electrical energy.

The battery may be configured by modularizing one or more cells, and may be configured by serial connection or parallel connection of one or more cells.

Meanwhile, in a battery management system (BMS) for controlling such a battery, in order to measure the voltage of one or more of the above-described cells through the ASIC, up to 12 cells are placed in one pack One module should be configured and the voltage should be measured for each module.

At this time, the maximum number of cells is set to 12 because there is a limit of the voltage level that the ASIC can withstand.

However, the voltage measurement of 12 cells included in one module can be performed at the same time, but the voltage measurement between the module and the module is not always performed at the same time, and a difference may occur at the time of measurement.

If there is a difference in measurement time, it may be mistaken as a difference in voltage between cells due to the difference in measurement time, although passive balancing is unnecessary. ≪ / RTI >

In order to solve the problems of conventional cell voltage measurement techniques, the present inventor has proposed a method of measuring a voltage change by applying a constant voltage to a plurality of modules including a plurality of cells, The present invention has been accomplished on the basis of a measured value of a voltage change between a plurality of modules, and can determine whether or not the voltage change measurement is synchronized according to whether or not a voltage change measurement time point between a plurality of modules coincides with each other.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-described problems, and an object of the present invention is to provide a method and a device for measuring a voltage change by applying a constant voltage to a plurality of modules including a plurality of cells, The present invention also provides an apparatus and method for determining a measurement synchronization between cell modules that can determine whether or not the voltage change measurement is synchronized based on whether or not a measurement time point of a voltage change between a plurality of modules is consistent based on a measured value.

More specifically, an object of the present invention is to provide an apparatus and method for determining a measurement synchronization between cell modules capable of providing the same voltage condition by simultaneously applying or blocking a constant voltage to a plurality of modules.

It is another object of the present invention to provide an apparatus and method for determining a measurement synchronization between cell modules in which voltage measurement points can be equally matched by simultaneously measuring voltages between a plurality of modules according to whether or not the voltage is applied under the same voltage condition I want to.

It is another object of the present invention to provide an apparatus and method for determining a measurement synchronization between cell modules capable of measuring a voltage change value depending on whether a voltage is applied and reporting the measured value.

It is also an object of the present invention to provide a measurement synchronization determination device and method for a cell module between cell modules capable of resetting the internal circuit of the voltage measurement part when the voltage change time point does not coincide or controlling the voltage measurement part to re- .

Among the embodiments, the apparatus for determining a measurement synchronization between cell modules may include a voltage application unit for applying a constant voltage to a plurality of modules including a plurality of cells, a voltage application unit for applying voltage to the plurality of modules, A voltage measuring unit for measuring a voltage change of each of the plurality of modules and reporting a measured value, and a controller for determining whether or not the voltage change measuring time of each of the plurality of modules matches the measured voltage, And a synchronization determination unit for determining synchronization of the mobile terminal.

The voltage applying unit may be a micro-computer (Micom).

The voltage measuring unit may include a voltage measuring sensor for simultaneously measuring the voltages of the plurality of modules.

The voltage measuring unit may self-test the over voltage of the plurality of modules.

Wherein the voltage measuring unit measures a voltage of the plurality of modules and reports a first measured value before applying a voltage and measures a voltage of the plurality of modules during a voltage application to report a second measured value, The third measurement value may be reported and transmitted to the synchronization determination unit.

The synchronization determination unit may control a master MCU and a slave MCU that control the voltage measurement unit.

Wherein the main arbitration unit judges whether or not the voltage change time point coincides with the first to third measured values, and when the voltage change time point does not coincide, the voltage change measurement is not synchronized (Fail) The controller may reset the auxiliary adjustment unit or allow the voltage measurement unit to re-measure the voltages of the plurality of modules.

The measurement synchronization determination device between the cell modules may be included in a battery management system (BMS) for controlling the battery.

Among other embodiments, a method for determining a measurement synchronization between cell modules includes the steps of: applying a constant voltage to a plurality of modules including a plurality of cells in a voltage application unit; Measuring a voltage change of each of the plurality of modules according to the measured voltage value and reporting a measured value; and a synchronization determination unit determining whether a voltage change measurement time point of each of the plurality of modules is coincident with the measured value, And determining whether the voltage change measurement is synchronized.

And simultaneously measuring the voltage of each of the plurality of modules through a voltage measurement sensor.

The step of reporting the measured values may include measuring a voltage of the plurality of modules and reporting a first measured value before applying a voltage, measuring a voltage of the plurality of modules and reporting a second measured value during voltage application Measuring a voltage of the plurality of modules and reporting a third measured value after the application of the voltage and transmitting the first to third measured values to the synchronization determination unit.

The step of determining the synchronization may further include the step of controlling the voltage measuring unit through a master MCU and a slave MCU.

Wherein the step of determining whether or not the synchronization is to be performed comprises the steps of: determining whether the voltage change measurement time point coincides with the first to third measured values; and when the voltage change measurement time point does not coincide, And the voltage measuring unit may cause the voltage of the plurality of modules to be re-measured.

The apparatus and method for determining a measurement synchronization between cell modules according to an embodiment of the present invention can provide the same voltage condition by simultaneously applying or blocking a constant voltage to a plurality of modules, Effect.

In addition, according to the present invention, since the voltages between a plurality of modules are simultaneously measured according to whether or not the voltage is applied under the same voltage condition, the voltage change measurement time points can be matched at the same time, It is possible to identify the module to be changed.

Further, the present invention measures the voltage change of a plurality of modules at the same point in time, thereby reducing the possibility of misinterpreting a voltage difference between cells, thereby unnecessarily discharging the cell voltage.

Further, the present invention can accurately measure the actual residual voltage of the cell, and has an effect of accurately calculating the SOC.

In addition, the present invention has the effect that the ASIC can diagnose itself whether the cell voltage is over voltage.

1 is a diagram illustrating an apparatus for determining a measurement synchronization between cell modules 100 according to an embodiment of the present invention.
2 is a block diagram showing the configuration of the electric vehicle 1.
3 is a diagram showing a normal voltage change state of a plurality of modules 100 according to whether a voltage is applied from the voltage application unit 110 shown in FIG. 1. More specifically, FIG. 3 (a) FIG. 3B is a diagram showing a state in which a voltage is being applied, and FIG. 3C is a diagram showing a state after voltage application. FIG.
FIG. 4 is a diagram showing an abnormal voltage change state of a plurality of modules 100 according to whether a voltage is applied from the voltage application unit 110 shown in FIG. 1. More specifically, FIG. 4 (a) FIG. 4B is a diagram showing a state in which a voltage is applied, and FIG. 4C is a diagram showing a state after voltage application. FIG.
5 is a diagram illustrating a synchronization determination method performed by the apparatus for determining a measurement synchronization between cell modules 100 according to another embodiment of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

1 is a diagram illustrating an apparatus for determining a measurement synchronization between cell modules 100 according to an embodiment of the present invention.

1, the apparatus for determining a measurement synchronization between cell modules 100 may include a voltage application unit 110, a voltage measurement unit 120, and a synchronization determination unit 130.

First, the voltage application unit 110 may apply a constant voltage (for example, 5 V) to a plurality of modules 10 including a plurality of cells (not shown).

Here, a plurality of such cells may be connected to form a battery by serial connection or parallel connection. The larger the number of cells, the larger the capacity of the battery.

In addition, when the voltage is applied to the cell from the voltage application unit 110, the voltage is raised or lowered. However, when the application of the voltage is interrupted, the cell can recover the original voltage again. This is for measuring the voltage change measurement time by varying the cell voltage, and will be described in more detail with reference to FIG. 2 to FIG. 3 which will be described later.

On the other hand, one module 10 can be configured as a plurality of cells, preferably up to 12 cells. At this time, the maximum number of cells is 12 because the voltage level that can be measured by the voltage measuring unit 120, which will be described later, is determined, and 12 cells in one module 10 can simultaneously measure the voltage.

Here, a plurality of cells may be placed in a pack that enters a voltage measuring unit 120, which will be described later. The one voltage measuring unit 120 may include a plurality of modules 10 having a maximum of 12 cells, At this time, the voltage applying unit 110 may apply a constant pressure (for example, 5 V) to the plurality of modules 10 at the same time.

In one embodiment, the voltage application unit 110 may correspond to a micro-computer (Micom).

Here, in general, a microcomputer may mean a computer that operates by using a microprogram, but the microcomputer in the present invention refers to a microcomputer in which a large-scale integrated circuit (LSI) or a circuit including a plurality of semiconductor memories (5V) at a predetermined pressure (5V).

In the present invention, the applied voltage is described as 5 V, but it should be noted that the voltage is not limited to 5 V and may be varied to various voltage values.

Next, the voltage measuring unit 120 may measure the voltage change of the plurality of modules 10 according to the voltage applied from the voltage applying unit 110, and report the measurement value .

Here, the voltage change of the plurality of modules 10 refers to a voltage value of a plurality of modules 10, a voltage value of a plurality of modules 10 when a voltage value of a plurality of modules 10 is applied, And a change in the voltage value of the plurality of modules 10 in a state in which the voltage application is stopped (i.e., a state in which the original voltage value of the plurality of modules 10 is recovered).

This will be described in more detail with reference to FIG. 3 and FIG. 4 which will be described later.

In addition, the term 'reporting' may mean that the measured values are converted into data and transmitted to the synchronization determination unit 130, which will be described later.

The measurement value is a voltage measurement result of a plurality of modules 10 in a state where a voltage of 5V is applied to a first measurement value which is a voltage measurement result value of a plurality of modules 10 before a voltage of 5V is applied Which is a result of voltage measurement of a plurality of modules 10 in a state in which the voltage application of 5 V is suspended.

The first to third measured values may be transmitted to the synchronization determination unit 130, which will be described later.

In addition, the voltage measuring unit 120 may include a voltage measuring sensor (not shown) for simultaneously measuring the voltages of the plurality of modules 10, respectively.

The voltage measurement sensor may be connected to each of the plurality of cells included in the module 10, and may perform a self-test on the over voltage of each of the cells.

It should be noted that since the voltage measuring sensor uses a known technique, a detailed description thereof will be omitted, and the type of the voltage measuring sensor is not limited as long as the voltage measuring sensor performs the above-described role.

Finally, the synchronization determination unit 130 receives the first to third measured values from the voltage measurement unit 120, and determines whether or not to synchronize the voltage change measurement of each of the plurality of modules 10 based on the received first to third measured values Can play a role.

Here, whether or not to synchronize with the voltage change measurement may mean whether or not the times at which the voltages of the plurality of modules 10 are changed are the same.

When the voltage change measurement is not the same, the voltage measurement unit 120 is included in the plurality of modules 10 due to the difference in the voltage change measurement time, even though the plurality of modules 10 actually have the same residual voltage It can be mistaken that a voltage difference has occurred between a plurality of cells.

This may cause balancing, particularly passive balancing, to discharge unnecessary cell voltages or to receive voltages from other cells, which can cause cells to break and explode due to overvoltage.

Therefore, the synchronization determination unit 130 determines whether the voltage change measurement time point coincides with the first through third measured values, thereby preventing unnecessary voltage discharge or unnecessary voltage charging among the plurality of cells included in the plurality of modules 10 .

The synchronization determination unit 130 may control the master MCU and the slaver MCU for controlling the internal circuit of the voltage measuring unit 120. The synchronization determining unit More specifically, FIG. 5 will be described later.

In one embodiment, the synchronization determination apparatus 100 for a cell module according to the present invention may be included in a battery management system (BMS) for controlling a battery, which will be described in detail with reference to FIG.

2 is a block diagram showing the configuration of the electric vehicle 1.

1, an electric vehicle 1 includes a battery 2, a battery management system (BMS) 3, an ECU (Electronic Control Unit) 4, an inverter 5 and a motor 6 have.

The battery 2 is an electric energy source for driving the electric vehicle 1 by providing a driving force to the motor 6. [ The battery 2 can be charged or discharged by the inverter 5 in accordance with the driving of the motor 6 or the internal combustion engine (not shown).

Here, the type of the battery 2 is not particularly limited and may be, for example, a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, or a nickel zinc battery.

Also, the battery 2 is formed of a pack in which a plurality of battery cells are connected in series or in parallel. One or more of these packs may be provided to form the battery 2.

The BMS 3 estimates the state of the battery 2 and manages the battery 2 using the estimated state information. For example, estimates and manages state information of the battery 2 such as a state of charge (SOC) of the battery 2, a state of health (SOH), a maximum input / output power allowable amount, and an output voltage. By using this state information, it is possible to control the charging or discharging of the battery 2, and furthermore, to estimate the replacement timing of the battery 2.

The ECU 4 is an electronic control device for controlling the state of the electric vehicle 1. [ For example, the torque level is determined based on information such as an accelerator, a break, a speed, and the like, and the output of the motor 6 is controlled to match the torque information.

The ECU 4 also sends a control signal to the inverter 5 so that the battery 2 can be charged or discharged based on status information of the SOC, SOH, etc. of the battery 2 transmitted by the BMS 3 .

The inverter 5 causes the battery 2 to be charged or discharged based on the control signal of the ECU 4. [

The motor 6 drives the electric vehicle 1 based on control information (for example, torque information) transmitted from the ECU 4 using the electric energy of the battery 2.

Since the above-described electric vehicle 1 is driven using the electric energy of the battery 2, the battery 2 and the motor 6 can be connected through various circuits.

As a result, the synchronization determination apparatus 100 for a cell module according to the present invention can estimate and manage the state information of the battery 2 such as the remaining capacity of the battery 2, the remaining lifetime, the maximum input / output power allowable amount, Further, by using such state information, it is possible to control the charging or discharging of the battery 2 or to estimate the replacement timing of the battery 2.

3 is a diagram showing a normal voltage change state of a plurality of modules 10 according to whether or not a voltage is applied from the voltage application unit 110 shown in FIG. 1. More specifically, FIG. 3 (a) FIG. 3B is a diagram showing a state in which a voltage is being applied, FIG. 3C is a diagram showing a state after a voltage is applied, and FIG. FIG. 4A is a diagram showing an abnormal voltage change state of a plurality of modules 10 according to whether or not a voltage is applied from the unit 110. More specifically, FIG. (b) shows a state in which a voltage is applied, and Fig. 4 (c) shows a state after voltage application.

3 (a) shows a first measured value obtained by measuring a voltage of a plurality of modules 10 corresponding to a state before a voltage is applied from the voltage applying unit 110. FIG.

There are a total of 10 modules of the plurality of modules 10, each of which has 10 cells, and in the present state corresponds to the state before the voltage is applied, so each cell represents 3.8V.

3 (b) shows a second measured value obtained by measuring the voltages of a plurality of modules 10 corresponding to a state in which a voltage of 5 V is applied from the voltage application unit 110. [

Originally, the entire cell in one module 10 shows 5V, but for the sake of easy understanding, only the lowest cell voltage value is changed to 5V, and the lowest cell voltage value of 10 modules 10 is changed to 5V .

3C shows a third measured value obtained by measuring a voltage of a plurality of modules 10 corresponding to a state in which the 5V voltage from the voltage applying unit 110 is cut off. The values of all of them are recovered to 3.8V.

This means that the ten modules 10 all agree on the time of the voltage change, indicating that the measurement of the voltage change is synchronized.

4 (a) shows a first measured value obtained by measuring a voltage of a plurality of modules 10 corresponding to a state before a voltage is applied from the voltage applying unit 110. In FIG.

There are a total of 10 modules of the plurality of modules 10, each of which has 10 cells, and in the present state corresponds to the state before the voltage is applied, so each cell represents 3.8V.

4 (b) shows a second measured value obtained by measuring the voltage of a plurality of modules 10 corresponding to a state in which a voltage of 5 V is applied from the voltage applying unit 110.

Originally, the entire cell in one module 10 shows 5V, but for the sake of easy understanding, only the lowest cell voltage value is changed to 5V, and the lowest cell voltage value of 10 modules 10 is changed to 5V , But the lowest cell voltage value of the second module (10) is still maintained at 3.8V.

4C shows a third measured value obtained by measuring the voltages of the plurality of modules 10 corresponding to the state in which the 5V voltage from the voltage applying unit 110 is cut off. The value of the lowest cell voltage of the second module 10 is changed to 5V instead of recovering to 3.8V.

This means that the voltage change of the cell at the bottom of the second module 10 is delayed by one timing and the measurement of the voltage change is not synchronized .

5 is a diagram illustrating a synchronization determination method performed by the apparatus 100 for determining a synchronization between cell modules according to another embodiment of the present invention.

5, the synchronization determination unit 130 controls the master MCU and the slaver MCU to determine whether to synchronize the voltage change measurement of the plurality of modules 10 do.

First, an overvoltage self test start command is transmitted from the main arbitration unit to the auxiliary arbitration unit (S501).

The sub-adjustment unit receives the voltage, and causes the voltage measuring unit 120 to measure the voltage of the plurality of modules 10 and to report the first measured value to the main adjusting unit (S502).

Then, in the main adjusting unit, the voltage adjusting unit 110 transmits a command to the voltage adjusting unit 110 to apply a voltage of 5V to the auxiliary adjusting unit (S503). The auxiliary adjusting unit receives the command, The voltage measuring unit 120 measures the voltages of the plurality of modules 10 at this time, and reports the second measured values to the main adjusting unit in step S504.

Then, in the main adjusting unit, an overvoltage self-voltage test end command is transmitted to the auxiliary adjusting unit (S505).

The auxiliary adjusting unit, which receives the voltage, causes the voltage applying unit 110 to stop the voltage application, causes the voltage measuring unit 120 to measure the voltages of the plurality of modules 10 at this time, And reports to the main control unit (S506).

The synchronization determining unit 130 receives the first to third measured values from the main adjusting unit and starts determining whether the voltage change measurement is synchronized (S507).

If the plurality of cell voltage values of the plurality of modules 10 included in the second measurement value correspond to 5 V, the synchronization determination unit 130 determines that the synchronization of the voltage change measurement of the plurality of modules 10 has passed (S508).

On the contrary, if the plurality of cell voltage values of the plurality of modules 10 included in the second measured value do not all correspond to 5V, the synchronization determination unit 130 compares the second measured value with the third measured value, It is judged whether the cell which did not show 5V in the second measured value shows 5V in the third measured value (S509)

At this time, if the cell that did not show 5V in the second measurement value indicates 5V in the third measured value, the synchronization determination unit 130 determines that the synchronization of the voltage change measurement of the plurality of modules 10 fails , And causes the main adjusting unit to reset the auxiliary adjusting unit (S510). This indicates that there is a module 10 exhibiting an abnormal voltage change.

On the contrary, if the cell which did not show 5V in the second measured value does not show 5V in the third measured value, the synchronization determining unit 130 causes the main adjusting unit to retry the overvoltage self test (S511).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

1: Electric vehicle
2: Battery
3: Battery Management System (BMS)
4: ECU (Electronic Control Unit)
5: Inverter
6: Motor
10: Module
100: Measurement synchronization determination device between cell modules
110:
120: voltage measuring unit
130:

Claims (13)

A voltage applying unit for applying a constant voltage to a plurality of modules including a plurality of cells;
A voltage measurement unit for measuring a voltage change of each of the plurality of modules with respect to the plurality of modules before, during, and after applying the voltage to report the first to third measured values; And
Controls the main control unit (Master MCU) and the sub control unit (Slave MCU) for controlling the voltage measuring unit, and controls the auxiliary control unit to control the voltage measuring unit so that the first to third measured values are reported to the main control unit And determining whether or not the voltage measurement times of the plurality of modules match each other based on the first to third measured values transmitted from the main adjusting unit, And a synchronization determination unit for determining whether or not the synchronization is established,
A device for determining a measurement synchronization between cell modules.
The method according to claim 1,
The voltage application unit may include:
Characterized in that it is a micro-computer (Micom)
A device for determining a measurement synchronization between cell modules.
The method according to claim 1,
The voltage measuring unit includes:
And a voltage measurement sensor for simultaneously measuring a voltage of each of the plurality of modules.
A device for determining a measurement synchronization between cell modules.
The method according to claim 1,
The voltage measuring unit includes:
And self-diagnoses an over voltage of the plurality of modules.
A device for determining a measurement synchronization between cell modules.
delete delete The method according to claim 1,
The main adjusting unit includes:
Determining whether or not the voltage change measurement time point coincides with the first to third measured values,
And when the voltage conversion measurement time does not coincide, it is determined that the voltage measurement between the plurality of cell modules is not synchronized (Fail), and the reset unit is reset, or the voltage measurement unit And the voltage of the module is measured again.
A device for determining a measurement synchronization between cell modules.
The method according to claim 1,
(BMS) that controls a battery. The battery management system according to claim 1,
A device for determining a measurement synchronization between cell modules.
Applying a constant voltage to a plurality of modules including a plurality of cells in a voltage applying unit;
Measuring a voltage change of each of the plurality of modules before, during, and after applying the voltage in a voltage measuring unit to report the first to third measured values; And
The synchronization determination unit controls the master MCU and the slave MCU that control the voltage measurement unit and the auxiliary adjustment unit controls the voltage measurement unit so that the first, Determining whether or not a voltage change measurement time point of each of the plurality of modules is coincident with the first to third measured values transmitted from the main adjusting unit after reporting to the main adjusting unit, And determining whether or not the voltage measurement is synchronized.
Determination of measurement synchronization between cell modules.
10. The method of claim 9,
The step of reporting the measurement value comprises:
And simultaneously measuring the voltage of each of the plurality of modules through a voltage measurement sensor.
Determination of measurement synchronization between cell modules.
delete delete 10. The method of claim 9,
The method of claim 1,
Determining whether the voltage change measurement time point coincides with the first to third measured values; And
And when the voltage change points do not coincide with each other, it is determined that the voltage measurement between the plurality of cell modules is not synchronized (Fail), and the reset unit is reset or the voltage measurement unit causes the plurality of modules And remeasuring the voltage of the battery.
Determination of measurement synchronization between cell modules.

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