KR20170051070A - Method and Apparatus for controlling FET of BMS - Google Patents

Abstract

The present invention relates to a battery pack including a master battery module and at least two slave battery modules. The master battery module includes: a master BMS controlling the operation of the master battery module and the entire battery pack; and a switching element controlled by the master BMS to block charging and/or discharging current of the master battery module. Each of the slave battery modules includes a slave BMS controlling the operation of each of the slave battery modules; and a switching element controlled by the slave battery modules to block charging and/or discharging current of the slave battery module. The master BMS further includes a battery module switching element control device controlling an on/off state of the switching elements based on a charging and/or discharging current value flowing in each of the battery modules. The method and apparatus for controlling FET of BMS can prevent FET from being damaged due to the introduction of high current by simultaneously off-controlling FETs in all of the battery modules.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method and an apparatus for controlling an FET of a BMS,

[0001] The present invention relates to an apparatus and method for controlling an FET of a BMS, and more particularly, to an FET control apparatus and method of a BMS capable of ensuring stability against failure occurring during operation of a FET of an energy storage BMS for independent operation .

Currently, Standalone Energy Storage System using Li-ion is used in UPS or home PV system in communication repeater. In this independent operation type energy storage system, the battery modules are electrically connected to each other in an electrically parallel manner, and each battery module has one master module through ID allocation and a plurality of slave modules Slave Moudel) modules. Here, the master module can acquire data for each slave module through communication with the slave modules.

Also, a plurality of battery modules included in the independent operation type energy storage system have a BMS (Battery Management System) in each battery module, and a BMS controls a power switching device such as a FET to protect the battery . If an abnormal condition such as overdischarge, overcharge, short, or overcurrent occurs in the battery module, the protection IC of BMS protects the BMS circuit and battery from abnormal state by controlling the charge FET / discharge FET do.

On the other hand, a battery module in which an abnormal state such as overcharge / overdischarge occurs in a plurality of battery modules constituting an independent operation type energy storage system in the related art, the BMS in the corresponding battery module individually controls FETs to protect the BMS circuit from an abnormal state do. As described above, in the case where the protection operation is performed for an abnormal state in which a plurality of battery modules constituting the independent operation type energy storage system are separately generated, a time difference occurs during the protection operation between the battery modules, There is a problem that the entire current flowing into or discharged from the battery pack is supplied to the FET of the battery module performing the operation and the control of the FET becomes impossible. That is, when the large current value flowing into the FET has a value outside the SOA (Safety of Area) area of the FET, a failure of the FET occurs and the corresponding battery module is damaged.

Therefore, it is required to develop a technology that can prevent damage caused by a large current input even if the battery module FET is controlled to be off when an abnormal state such as overcharge / overdischarge occurs in the BMS for energy storage for independent operation.

KR 2006-0037390 A

When an abnormal state such as overcharge / overdischarge occurs in each battery module constituting the independent operation type energy storage system, even if the FETs of the battery modules are turned off, the FETs which are finally controlled to be off are damaged The present invention also provides an apparatus and method for controlling an FET of a BMS.

The BMS FET control apparatus according to an embodiment of the present invention includes a master battery module and two or more slave battery modules, wherein the master battery module controls operations of the master battery module and the entire battery pack And a switching element for blocking charge and / or discharge current of the master battery module under the control of the master BMS and the master BMS, wherein each of the slave battery modules includes a slave BMS And a switching element for shutting off the charging and / or discharging current of the slave battery module under the control of the slave BMS, wherein the master BMS is controlled based on the charging and / or discharging current values flowing to the battery modules Battery module switching to control on / off of switching elements And a device control device.

Also, the apparatus for controlling a switching element of the battery pack includes: an FET off quantity calculation unit for receiving information on FET off from all battery modules and calculating the quantity of off FETs; Off control of the entire FETs which are not turned off according to the value of the current flowing through the battery modules which are not controlled to be off, Off control unit for performing simultaneous-off control on the FETs of all the battery modules, if it is determined that the battery module is in the off state.

The simultaneous turn-off control unit may be configured to calculate a current amount of each battery module by dividing the current value of the entire battery pack by a value obtained by subtracting the number of off-state FETs calculated by the FET off- Value operation unit and a normal current value determination unit for each battery module that determines whether simultaneous control is required when the current value of each battery module calculated in the current value calculation unit for each battery module exceeds a preset current limit value.

Meanwhile, the FET control method of the BMS according to the embodiment of the present invention includes a FET off-quantity calculation step of calculating the number of FETs operating in the OFF state among the FETs included in all the battery modules, A simultaneous-off control necessity judging step of judging whether simultaneous-off control of all FETs which are not turned off based on a current value flowing through battery modules which have not been subjected to the off- Off control for performing simultaneous turn-off control by transmitting a signal for simultaneously turning off the FETs of all the battery modules, when it is determined to perform the simultaneous turn-off control.

The step of calculating the number of FET offsets may include generating an information transmission request signal for requesting FET off state information to all the battery modules, An information transmission request signal transmission step of transmitting a status information transmission request signal to all battery modules, an information reception step of receiving FET off status information from all battery modules in response to a FET off status information transmission request signal, And an FET off quantity calculation step of calculating an off FET quantity based on the off state information received from the FETs.

In the simultaneous-off control necessity determination step, the number of off-state FETs calculated in the FET off-quantity calculation step is excluded from the total FET quantity, and the current value of the entire battery pack is divided by the number of remaining FETs, (OCCW_TH / ODCW_TH, hereinafter, referred to as a limit value) calculated in the current value calculation step of each battery module, And determining a normal current value for each module.

The simultaneous turn-off control step may include a step of performing an FET operation control of a master battery module that converts an FET of the master battery module into an off state, a step of generating an FET turn-off signal to generate a simultaneous turn- A FET simultaneous off signal transmission step of transmitting the generated FET simultaneous off signal to all the slave battery modules, and a FET simultaneous turn off signal of the slave battery modules when the simultaneous off conversion signal is received from all the slave battery modules Off < / RTI >

The apparatus and method for controlling a FET of a BMS according to an embodiment of the present invention can simultaneously control FETs in an entire battery module to be turned off to prevent damage to the FET due to high current input.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram of an FET control device of a BMS according to an embodiment of the present invention; FIG.
FIG. 2 is a configuration diagram of a simultaneous-off control determining unit in the FET control apparatus of the BMS according to the embodiment of the present invention; FIG.
3 is a flowchart of a method of controlling a FET of a BMS according to an embodiment of the present invention.
FIG. 4 is a flow chart of a step of calculating the FET off quantity among the FET control methods of the BMS according to the embodiment of the present invention. FIG.
FIG. 5 is a flowchart illustrating a step of determining whether to require simultaneous-off control among FET control methods of a BMS according to an embodiment of the present invention. FIG.
FIG. 6 is a flowchart illustrating steps of performing simultaneous turn-off control of a FET control method of a BMS according to an embodiment of the present invention; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Only embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

1. The FET control device of the BMS according to the embodiment of the present invention

1 is a configuration diagram of an FET control apparatus of a BMS according to an embodiment of the present invention.

Referring to FIG. 1, an independent energy storage system 300 including a BMS FET control apparatus according to an embodiment of the present invention includes a master battery module 100 and a plurality of slave battery modules 200: 200a, 200b , ..., 200n. Here, the master battery module 100 can control the FET operation of the plurality of slave battery modules 200. That is, the FET control device of the present invention is formed in the configuration included in the BMS of the master battery module.

In addition, the battery modules are assigned the IDs of the battery modules having the same configuration, and can be divided into one master battery module and the remaining slave battery modules.

The FET control unit 110 of the master battery module 100 includes an FET off quantity calculation unit 120, a simultaneous off control determiner 130 and a simultaneous off control performing unit 140 .

The FET off quantity calculation unit 120 can calculate the number of FETs operating in the off state among the FETs included in the entire battery module.

More specifically, the FET off quantity calculation unit 120 may generate an FET off state information transmission request signal for requesting transmission of the FET off state information, and may transmit the FET off state information transmission request signal to all the battery modules. Here, the FET off state information is information indicating a state in which the operation state of the FET is turned off in the BMS to protect each battery module when an abnormal state such as overdischarge / overcharge in each battery module occurs.

Thereafter, the FET off quantity calculation unit 120 may receive the FET off state information in each battery module from the entire battery module as a response signal to the FET off state information transmission request signal.

The FET control unit 110 can calculate the number of off-state FETs by calculating the number of FET offsets based on information on the FET off state received from the entire battery module.

2 is a configuration diagram of a simultaneous-off control determining unit of the FET control apparatus of the BMS according to the embodiment of the present invention.

Referring to FIG. 2, the simultaneous-off control determining unit 130 may include a current value calculating unit 131 for each battery module and a steady current value determining unit 132 for each battery module.

The current value calculation unit 131 for each battery module calculates the amount of current flowing into each of the battery modules whose charging and discharging are not controlled in real time. The calculation method is calculated by dividing the total current by a value obtained by subtracting the off quantity calculated by the FET off quantity calculation unit 120 from the total FET number. Here, the total current (battery pack current) directly measures the total current in the master battery module 100 or uses a predetermined total current value or the like.

Also, the connection structure of the battery modules is a parallel connection structure, and the total current is the sum of the currents of the battery modules. Since the battery modules are the same battery module, the same current value is entered, and in order to perform current calculation for each battery module, the total current value is divided by the number of battery modules.

The normal current value determination unit 132 for each battery module can determine whether the current value of each battery module calculated by the current value calculation unit 131 for each battery module exceeds a preset current limit value.

As a result of the determination, when the current value of each battery module calculated by the current value calculator 131 for each battery module has a current value exceeding a preset current limit value, It can be concluded that simultaneous FET turn-off control for turning off the FETs simultaneously is necessary.

The simultaneous turn-off control performing unit 140 turns off the FET of the master battery module 100 sequentially when the simultaneous turn-off control unit 130 determines that simultaneous turn-off control is necessary, A command signal for simultaneously turning off the FETs of the battery modules 200 is generated and transmitted to all the slave battery modules 200 so that the FETs of all the slave battery modules can be turned off at the same time.

2. Method for controlling FET of BMS according to the embodiment of the present invention

A method of controlling a FET of a BMS according to an embodiment of the present invention includes a master battery module 100 and a plurality of slave battery modules 200. In the independent operation type energy storage system 300, 0.0 > 100). ≪ / RTI >

3 is a flowchart of a method of controlling a FET of a BMS according to an embodiment of the present invention.

3, the FET control unit 110 of the master battery module 100 according to the embodiment of the present invention includes FETs included in all the battery modules, The calculation step S310 may be performed.

More specifically, the FET control unit 110 may further include the steps shown in FIG. 4 to perform the FET off quantity calculation step S310.

FIG. 4 is a flowchart of the FET off-quantity calculation step in the FET control method of the BMS according to the embodiment of the present invention.

Referring to FIG. 4, the FET control unit 110 may perform an information transmission request signal generation step (S311) for generating a FET off state information transmission request signal to request transmission of FET off state information to all battery modules have.

Thereafter, the FET control unit 110 may perform an FET off state information transmission request signal transmission step (S312) for transmitting the generated FET off state information transmission request signal to all the battery modules.

Thereafter, the FET control unit 110 may perform an information receiving step (S313) of receiving FET off state information of each battery module from all battery modules in response to the FET off state information transmission request signal.

Thereafter, the FET control unit 110 may perform an FET off quantity calculation step (S314) of calculating the number of FET offs by calculating the number of FET offsets from information on the FET off state received from all the battery modules . Here, an abnormal state such as overdischarge / overcharge occurs individually, and in the case where an abnormal state does not occur, the FET off control may not be performed in the BMS of the corresponding battery modules. Therefore, only when the number of off-state FETs of all the battery modules is calculated, the process proceeds to the next simultaneous-off control necessity determination step.

Thereafter, the FET control unit 110 performs a simultaneous-off control necessity determination step (S320) for determining whether simultaneous control is required for all the battery modules in the number of off-state FETs calculated in the FET off-quantity calculation step S310 . Here, the simultaneous-off control is to control the FETs other than the FETs that have already been turned off to be simultaneously turned off.

More specifically, the FET control unit 110 may further include the steps shown in FIG. 5 to perform the simultaneous-off control necessity determination step S320.

FIG. 5 is a flowchart illustrating a method for controlling simultaneous turn-off of a BMS control method according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the FET control unit 110 calculates the total amount of electric current (hereinafter referred to as " current amount ") by the number of battery modules other than the number of FETs (S321) for calculating a current value for each module by dividing the current value of each battery module.

Thereafter, the FET controller 110 determines whether the current value of each battery module calculated in the current value calculation step S321 of each battery module exceeds a preset current limit value, and a large current flows to the remaining FETs except the FETs already off in the battery module In order to prevent the FET from being damaged, it is possible to perform a normal current value determination step S322 for each battery module to determine whether the simultaneous OFF control is performed.

The FET control unit 110 may perform a simultaneous off control step S330 of turning off the FET of the master battery module and controlling the FETs of the slave battery modules to be in the off state simultaneously when simultaneous turn off control of the entire battery module is required .

More specifically, the FET control unit 110 may further include the steps shown in FIG. 6 to perform the concurrent off control step S330.

FIG. 6 is a flow chart of the simultaneous turn-off control step in the FET control method of the BMS according to the embodiment of the present invention.

Referring to FIG. 6, when it is determined that the simultaneous turn-off control is required, the FET control unit 110 performs the FET operation control performing step S331 of the master battery module that converts the on-state FET of the master battery module into the off state can do. If the master battery module has already been turned off in the process of acquiring the FET off state information of the master battery module (S314), the process proceeds to the next step.

Thereafter, a slave battery module FET simultaneous off signal generation step (S332) may be performed to generate an FET simultaneous off signal for turning on the FET in the on state in all the slave battery modules of the FET control unit 110.

Thereafter, the FET control unit 110 performs an FET simultaneous off signal transmission step (S333) for transmitting the simultaneous FET off signal generated so that the operation of the FET is simultaneously turned off in all the slave battery modules to the entire slave battery module can do.

Thereafter, the BMSs of the slave battery module can perform the simultaneous turn-off of the FETs of the slave battery modules (S334) that simultaneously turn off the FETs of all the slave battery modules when receiving the FET simultaneous off signal.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. 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 invention.

100: Master battery module
110: FET control unit
120: FET off-flow rate measuring unit
130: simultaneous-off control judgment unit
131: current value calculator per battery module
132: normal current value determination unit per battery module
140: simultaneous-off control performing unit
200: Slave battery modules
300: Stand-alone energy storage system

Claims (12)

1. A battery pack comprising a master battery module and at least two slave battery modules,
The master battery module includes a master BMS for controlling operations of the master battery module and the entire battery pack;
A switching element for shutting off the charging and / or discharging current of the master battery module under the control of the master BMS; And,
Each of the slave battery modules includes a slave BMS for controlling the operation of each of the slave battery modules;
A switching device for shutting off the charging and / or discharging current of the slave battery module under the control of the slave BMS; And,
The master BMS,
A battery module switching element control device for controlling ON / OFF of the switching elements based on the charging and / or discharging current values flowing respectively through the battery modules; Wherein the battery pack further comprises a battery pack.
In a switching element control device of a battery pack,
An FET off quantity calculation unit for receiving information about the FET off from all the battery modules and calculating the number of off-state FETs;
A simultaneous OFF control determining unit for determining whether simultaneous OFF control of all the FETs which are not turned off according to the value of the current flowing through the battery modules which are not controlled in OFF is calculated when calculating the number of FETs turned OFF in the FET OFF quantity calculating unit;
A simultaneous-off control performing unit for performing simultaneous-off control on the FETs of all the battery modules when the simultaneous-off control determining unit determines that simultaneous-off control is necessary; And a control unit for controlling the FET of the BMS for energy storage.
The control method according to claim 2,
A current value calculator for each battery module for calculating a current value for each battery module by dividing a current value of the entire battery pack by a value obtained by subtracting the number of OFF FETs calculated by the FET off-rate calculating unit from the total number of FETs;
A normal current value determination unit for each battery module that determines whether simultaneous control is required when the current value of each battery module calculated by the current value calculation unit for each battery module exceeds a preset current limit value; And a control unit for controlling the FET of the BMS for energy storage.
The apparatus of claim 2,
If the simultaneous turn-off control unit determines that the simultaneous turn-off control is required, it generates and transmits a command signal to simultaneously turn off the FETs of all the slave battery modules after turning off the FET of the master battery module, FETs are turned off at the same time.
It is technically difficult to simultaneously turn off the master battery module and the battery modules, so that the master battery module is first turned off to redistribute the current to the slave battery modules, and then the slave battery modules are simultaneously turned off, Wherein the FET is protected.
Calculating an amount of FET offsets for calculating the number of FETs operating in the off state among the FETs included in all the battery modules;
A simultaneous-off control necessity determining step of determining whether simultaneous turn-off control of all FETs which are not turned off based on a current value flowing through battery modules which are not controlled in off-state at the time of calculating the number of FETs turned off in the FET turn-
Performing a simultaneous-off control step of performing simultaneous-off control by transmitting a signal for simultaneously turning off the FETs of all battery modules when the simultaneous turn-off control determining step determines to perform simultaneous turn-off control; Wherein the energy storage BMS comprises a plurality of FETs.
7. The method of claim 6, wherein the FET off-
An information transmission request signal generation step of generating an FET off state information transmission request signal for requesting information on the FET off state to all the battery modules;
An information transmission request signal transmission step of transmitting the FET off state information transmission request signal generated in the information transmission request signal generation step to all the battery modules;
An information receiving step of receiving FET off state information from all the battery modules in response to the FET off state information transmission request signal;
An FET off quantity calculation step of calculating an off FET quantity based on off state information received from all the battery modules; Wherein the energy storage BMS comprises a plurality of FETs.
The method of claim 7,
The FET off state occurs when an abnormal state such as overdischarge / overcharge occurs in each battery module, and proceeds to the simultaneous off control determination step only when the number of FETs turned off in all the battery modules is calculated A method for controlling an FET of an independent operating type energy storage BMS.
7. The method of claim 6,
Calculating a current value for each battery module by dividing a current value of the entire battery pack by the number of remaining FETs, excluding the FET off-quantity calculated in the FET off-charge calculating step, from the total FET quantity;
Determining a normal current value for each of the battery modules to determine whether the current value of each battery module calculated in the current value calculation step for each battery module exceeds a predetermined limit value; Wherein the energy storage BMS comprises a plurality of FETs.
The method of claim 9, wherein the determining of the steady-
Off control is performed when the current value of each battery module exceeds a predetermined limit value and when the current value of each battery module does not exceed the limit value, Method for FET control of energy storage BMS.
7. The method of claim 6,
Performing a FET operation control of a master battery module that converts an FET of a master battery module into an off state;
Generating a simultaneous turn-off signal for generating a simultaneous turn-off signal to be sent to all slave battery modules;
A simultaneous FET off signal transmission step of transmitting the generated FET simultaneous off signal to all slave battery modules;
Performing simultaneous turn-off of the slave battery modules that simultaneously turn off the FETs of the slave battery modules upon receiving the simultaneous turn-off signal from all the slave battery modules; Wherein the energy storage BMS comprises a plurality of FETs.
12. The method of claim 11, wherein performing the FET operation control of the master battery module comprises:
When the FET is already off in the information obtained by measuring the FET off state directly in the master battery module, this step is skipped and the next FET operation control signal generating step is performed. Control method.

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