KR102568054B1 - Battery Discharge Apparatus And Discharging Method Thereof - Google Patents

Abstract

The present invention, the main control unit and; a first discharge unit for discharging the battery from a discharge start voltage to a discharge end voltage under the control of the main controller; a second discharge unit for discharging the battery from the discharge completion voltage to a reverse potential voltage under the control of the main controller; When the voltage of the battery increases from the reverse potential voltage to 0V, the battery discharge device includes a shorting switch for shorting the battery under the control of the main controller.

Description

Battery Discharge Apparatus And Discharging Method Thereof

The present invention relates to a battery discharge device, and more particularly, to a battery discharge device capable of discharging up to a reverse potential voltage of negative polarity that is less than the discharge completion voltage and a discharge method thereof.

In general, a vehicle using an internal combustion engine using gasoline or heavy oil as a main fuel has a serious impact on air pollution and the like. Accordingly, in recent years, in order to reduce pollution, great efforts have been made to develop electric vehicles or hybrid vehicles.

In particular, an electric vehicle is a vehicle using a battery engine operated by electric energy output from a battery, and a battery formed of a plurality of battery cells capable of charging and discharging in a pack is used as a main power source. Because it is used as a gas, there is no exhaust gas and it has the advantage of very little noise.

The battery, which is a secondary storage battery, is discharged using a discharge device for testing, reuse, or recycling.

For example, when a performance test of a battery with a problem is performed or a battery in use is reused in another device, the detached battery is discharged to the discharge end voltage and transported with a charge rate of 0%.

And, when disassembling a battery whose life is over and recycling materials, the detached battery is discharged to a voltage less than the discharge end voltage and transported in a state of total voltage of 0V.

In this way, in order to secure electrical safety, the detached battery is discharged through the discharge device.

In particular, batteries for material recycling are immersed in salt water and discharged, but such salt water immersion discharge has a problem of poor workability, increased discharge time, and increased discharge cost according to additional equipment.

On the other hand, even after the battery is discharged to a total voltage of 0V, the voltage increases again when the discharge device is removed. To prevent this phenomenon, the positive and negative terminals of the battery are short-circuited ( short).

However, even when the total series voltage of the battery is 0V, some of the plurality of cells connected in series of the battery may be in a reverse potential state, and in this case, there is a risk of accident due to a short circuit between the positive terminal and the negative terminal. there is

The present invention is to solve this problem, by discharging the battery using the first discharge unit until the discharge completion voltage and discharging the battery using the second discharge unit until the reverse potential voltage of negative polarity is less than the discharge completion voltage, stability is improved. It is an object of the present invention to provide a battery discharging device and a discharging method thereof, in which the discharging time and discharging cost are improved, and the convenience is improved.

In order to achieve the above object, the present invention, the main control unit and; a first discharge unit for discharging the battery from a discharge start voltage to a discharge end voltage under the control of the main controller; a second discharge unit for discharging the battery from the discharge completion voltage to a reverse potential voltage under the control of the main controller; When the voltage of the battery increases from the reverse potential voltage to 0V, the battery discharge device includes a shorting switch for shorting the battery under the control of the main controller.

And, the first discharge unit, a switching control unit connected to the battery; A load resistance unit connected between the switching control unit and the battery to provide different resistance values may be included.

Also, the switching controller may include at least one insulated gate bipolar transistor (IGBT).

The load resistance unit may include a plurality of resistors having different resistance values and a plurality of switches connected to both ends of at least one of the plurality of resistors, respectively.

In addition, the second discharge unit, a phase control unit connected to the battery; a transformer having a secondary side connected to the phase controller; A switchboard connected to a primary side of the transformer may be included.

And, the phase control unit may include at least one silicon-controlled rectifier (SCR).

In addition, the at least one silicon-controlled rectifier may include four silicon-controlled rectifiers connected to each other in a bridge form.

On the other hand, the present invention comprises the steps of discharging the battery from the discharge start voltage to the discharge end voltage by the first discharge unit; discharging the battery from the discharge completion voltage to a reverse potential voltage by a second discharge unit; and shorting the battery when the voltage of the battery increases from the reverse potential voltage to 0V by a shorting switch.

The step of discharging the battery by the first discharge unit may include setting the switching controller of the first discharge unit to be in an on state and the phase control unit of the second discharge unit to be in an off state; The step of providing different resistance values by the load resistance part of the first discharge part, and discharging the battery by the second discharge part, wherein the switching control part of the first discharge part is in an off state and the causing the phase control unit of the second discharge unit to have an on state; and enabling the phase control unit of the second discharge unit to be in an off state when the battery reaches the reverse potential voltage.

The battery discharging method may include operating the first and second discharging units together between discharging the battery by the first discharging unit and discharging the battery by the second discharging unit. and; The method may further include stopping the first discharge unit.

In the present invention, the battery is discharged using the first discharge unit until the discharge completion voltage and the battery is discharged using the second discharge unit until the reverse potential voltage of negative polarity is lower than the discharge completion voltage, thereby improving stability and reducing discharge time and discharge cost. It has the effect of reducing and improving convenience.

In particular, it is possible to completely discharge the battery to 0V through reverse potential discharge, which was impossible with the existing discharge device, and is superior in time and economy compared to the existing discharge method in which the battery is completely discharged by depositing it in salt water for recycling. The problem of disposal of used brine can also be completely solved.

In addition, when attaching or detaching a battery for repair or replacement in an electric vehicle, the battery must be discharged, and at this time, the battery can be discharged to a desired voltage with a constant current desired by the user, so that the performance of the battery can be checked. In addition, discharging is performed to determine whether the battery is reused, and discharging for immediate disposal may be additionally performed when the required performance is not met. This can be equally applied to batteries of electric vehicles as well as batteries of energy storage devices.

1 is a block diagram showing a battery discharging device according to a first embodiment of the present invention;
2 is a circuit diagram showing a battery discharging device according to a first embodiment of the present invention;
3a to 3c are views for explaining the operation of the battery discharging device according to the first embodiment of the present invention.
4 is a flowchart for explaining a discharging method of the battery discharging device according to the first embodiment of the present invention.
5 is a flowchart for explaining a discharging method of a battery discharging device according to a second embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing a battery discharging device according to a first embodiment of the present invention.

As shown in FIG. 1, the battery discharging device 110 according to the first embodiment of the present invention includes a main control unit 120, a switching control unit 130, a load resistance unit 132, a phase control unit 140, It includes a transformer 142, a switchboard 144, a changeover switch 150, a current detection unit 152, a voltage detection unit 154, and a shorting switch 156, the switching control unit 130 and the load resistance unit 132 A first discharge unit is constituted, and the phase control unit 140, transformer 142, and switchboard 144 constitute a second discharge unit.

Specifically, the main control unit 120 is connected to the voltage detection unit 154 and the current detection unit 152 to receive the detected voltage and current of the battery 170, and to the switching control unit 130 and the phase control unit 140. The switching control unit 130 and the phase control unit 140 are controlled according to the voltage and current of the connected and detected battery 170 .

For example, the main controller 120 controls the switching controller 130 to operate and the phase controller 140 to stop operating when the detected voltage of the battery 170 is in the range between the discharge start voltage and the discharge end voltage. When the detected voltage of the battery 170 is within a range between the discharge completion voltage and the reverse potential voltage of negative polarity, the switching control unit 130 may stop operation and control the phase control unit 140 to operate.

Here, the discharge completion voltage is a voltage lower than the discharge termination voltage, and the discharge termination voltage may be a voltage corresponding to a state of 0% charge rate.

The switching control unit 130 is connected between the load resistance unit 132 and the current detection unit 152 and controls the connection between the load resistance unit 132 and the current detection unit 152 according to the control of the main control unit 120.

For example, the switching control unit 130 may control the load resistance unit 132 and the current detection unit 152 to be connected when the detected voltage of the battery 170 is in a range between the discharge start voltage and the discharge completion voltage. there is.

The switching controller 130 may include a large-capacity switching device such as an insulated gate bipolar transistor (IGBT).

The load resistance unit 132 is connected between the switching control unit 130 and the changeover switch 150 to adjust the resistance value of the load resistance so that the battery 170 is discharged in an optimal state under the control of the main control unit 120. .

For example, the load resistance unit 132 may have different resistance values according to the current and voltage of the battery 170 .

The phase control unit 140 is connected to the positive terminal (+) of the battery 170 and the current detection unit 152, and is connected to the positive terminal (+) of the battery 170 and the current detection unit 152 under the control of the main control unit 120. control the connection.

For example, the phase control unit 140, when the detected voltage of the battery 170 is in the range between the discharge completion voltage that is less than the discharge end voltage and the reverse potential voltage of the negative polarity, the positive terminal (+) of the battery 170 and The current detection unit 152 can be controlled to be connected.

Here, the discharge completion voltage and the reverse potential voltage may be voltages having the same magnitude and opposite polarity, the discharge start voltage being about 500V, the discharge end voltage being about 250V, the discharge completion voltage being about 10V, and the reverse potential voltage may be about -10V.

The phase controller 140 may include a switching element such as a silicon-controlled rectifier (SCR).

The transformer 142 and the switchboard (power grid) 144 are sequentially connected to the phase control unit 140 to supply power to the phase control unit 140 .

The changeover switch 150 is connected between the load resistance unit 132 and the positive terminal (+) of the battery 170, and is connected to the load resistance unit 132 and the positive terminal of the battery 170 under the control of the main control unit 120. By controlling the connection of (+), the operation of the first and second discharge units is switched.

For example, when the detected voltage of the battery 170 is in a range between a discharge start voltage and a discharge completion voltage, the changeover switch 150 connects the switching control unit 130 and the load resistance unit 132 to the battery 170. connected so that the battery 170 is discharged by the first discharge unit, or when the detected voltage of the battery 170 is in the range between the discharge completion voltage and the reverse potential voltage of the negative polarity, according to the control of the main control unit 120 The switching control unit 130 and the load resistance unit 132 may be separated from the battery 170 so that the battery 170 is additionally discharged by the second discharge unit.

The current detection unit 152 is connected to the negative terminal (-) of the battery 170 to detect the current of the battery 170, and the voltage detection unit 154 is connected to the positive terminal (+) and the negative terminal (-) of the battery 170. ) to detect the voltage of the battery 170, and the current detection unit 152 and the voltage detection unit 154 transfer the detected voltage and current of the battery 170 to the main control unit 120.

The shorting switch 156 is connected between the positive terminal (+) and the negative terminal (-) of the battery 170 and is connected to the positive terminal (+) and the negative terminal (-) of the battery 170 according to the control of the main controller 120. ) to control the connection.

For example, the short-circuit switch 156 operates the positive electrode of the battery 170 until the detected voltage of the battery 170 decreases from the discharge start voltage to the reverse potential voltage through the discharge completion voltage and then increases again to reach 0V. When the terminal (+) and the negative terminal (-) are disconnected (open) and the detected voltage of the battery 170 increases from the reverse potential voltage to 0V, the positive terminal (+) and the negative terminal of the battery 170 ( -) can be shorted.

As described above, in the battery discharge device 110 according to the first embodiment of the present invention, the battery 170 is discharged from the discharge start voltage by the first discharge unit of the switching control unit 130 and the load resistance unit 132. It passes through the end voltage and is discharged to the discharge completion voltage, and the battery 170 is further discharged from the discharge completion voltage to the reverse potential voltage by the second discharge unit of the phase controller 140, the transformer 142, and the switchboard 144. And, when the voltage of the battery 170 becomes 0V by the shorting switch 156, the positive terminal (+) and the negative terminal (-) of the battery 170 are shorted.

Accordingly, the stability of the battery 170 is improved, the discharge time and cost of the battery 170 are reduced, and the convenience of the battery 170 discharging process is improved.

An exemplary circuit of the battery discharging device 110 will be described with reference to the drawings.

2 is a circuit diagram showing a battery discharging device according to a first embodiment of the present invention, and descriptions of the same parts as in FIG. 1 are omitted.

As shown in FIG. 2, the battery discharging device 110 according to the first embodiment of the present invention includes a switching control unit 130, a load resistance unit 132, a phase control unit 140, a transformer 142, and a switchboard. 144, changeover switch 150, current detection unit 152, short switch 156, reactor 160, diode 162, main relay 164, fuse 166.

The switching control unit 130 operates the load resistance unit 132 and the battery through the changeover switch 150, the current detection unit 152, the main relay 164, and the fuse 166 under the control of the main control unit (120 in FIG. 1). Controls the connection of 170.

For example, the switching controller 130 may include a plurality of insulated gate bipolar transistors (IGBTs) connected in parallel with each other.

The load resistance unit 132 adjusts the resistance value of the load resistance connected to the battery 170 according to the control of the main control unit 120 .

For example, the load resistance unit 132 is connected in series or parallel and has first to fifth resistors R1 to R5 having different resistance values, and both ends of the first to fifth resistors R1 to R5. Connected first to fourth switches s1 to s4 may be included.

The first to fourth resistors R1 to R4 and three fifth resistors R5 are sequentially connected in series to the changeover switch 150, and the first to third switches s1 to s3 are respectively second to third It is connected to both ends of the four resistors R2 to R4, and the fourth switch s4 may be connected to both ends of the three fifth resistors R5.

The load resistance unit 132 may implement various resistance values according to the on/off of the first to fourth switches s1 to s4 under the control of the main control unit 120 .

For example, when the first to fourth switches s1 to s4 are on, off, on, and off, respectively, the load resistance unit 132 has a resistance value of “R1 + R3 + 3R5”, and When the fourth switches s1 to s4 are turned on, on, off, or on, respectively, the load resistance unit 132 may have a resistance value of “R1+R4”.

The switching control unit 130 and the load resistance unit 132 may constitute a first discharge unit.

The phase controller 140 controls the positive terminal (+) and negative terminal (-) of the battery 170 through the current detector 152, the main relay 164, and the fuse 166 under the control of the main controller 120. control the connection.

For example, the phase control unit 140 may include four silicon-controlled rectifiers (SCRs) connected to each other in a bridge form.

The secondary side of the transformer 142 may be connected to the input terminal of the bridge, and the switchboard 144 may be connected to the primary side of the transformer 142 .

The phase control unit 140, the transformer 142, and the switchboard 144 constitute a second discharge unit.

The phase control unit 140 may reduce the discharge completion voltage of the battery 170 to the reverse potential voltage using the transformer 142 and the switchboard 144 .

For example, the transformer 142 outputs positive and negative AC voltages according to the input voltage of the switchboard 144 and transfers them to the input terminal of the bridge of the phase control unit 140 . Then, the phase controller 140, after being turned on under the control of the main controller 120, when the voltage of the positive terminal (+) of the battery 170 is greater than the secondary side voltage of the transformer 142, the battery ( 170), the voltage of the positive terminal (+) of the battery 170 decreases, and the voltage of the positive terminal (+) of the battery 170 is maintained by maintaining the on state connecting the positive terminal (+) and negative terminal (-) of the battery 170 When the voltage of the secondary side of the transformer 142 is equal to or smaller than that of the battery 170, the positive terminal (+) and the negative terminal (-) of the battery 170 are turned off to block the voltage of the positive terminal (+) of the battery 170. Decrease may be stopped.

The changeover switch 9150 is turned on under the control of the main control unit 120 so that the battery 170 is discharged by the first discharge unit including the switching control unit 130 and the load resistance unit 132, Under the control of the control unit 120, the battery 170 can be turned off so that the battery 170 can be discharged by the second discharge unit including the phase control unit 140, the transformer 142, and the switchboard 144.

The reactor 160 may serve to remove harmonic components of current and voltage of the battery 170 , and the diode 162 may serve to block reverse voltage of the battery 170 .

The main relay 164 may serve to start or stop the operation of the battery discharge device 110, and the fuse 166 may serve to block the inflow of abnormal voltage and current.

The battery discharge device 110 discharges the battery 170 by the first discharge unit from the discharge start voltage to the discharge end voltage through the discharge end voltage, and discharges the battery 170 from the discharge end voltage to the reverse potential voltage in the second discharge unit. When the battery 170 is additionally discharged and the voltage increases from the reverse potential voltage to 0V, the battery 170 can be short-circuited by the shorting switch 156, which will be described with reference to the drawings.

3A to 3C are views for explaining the operation of the battery discharge device according to the first embodiment of the present invention, and descriptions of the same parts as those in FIGS. 1 and 2 are omitted.

As shown in FIG. 3A, when the battery discharging device 110 according to the first embodiment of the present invention is operated, the switching control unit 130, the changeover switch 150 and the main relay 164 are turned on, respectively. The phase control unit 140 and the shorting switch 156 are turned off, and the battery 170 is discharged by the first discharge unit of the switching control unit 130 and the load resistance unit 132, and the voltage of the battery 170 is reduced. It gradually decreases from the initial discharge start voltage to the discharge end voltage through the discharge end voltage.

For example, the discharge start voltage may be about 500V, the discharge end voltage may be about 250V, and the discharge end voltage may be about 10V.

At this time, the first to fourth switches s1 to s4 of the load resistance unit 132 may have an on state or an off state, respectively.

As shown in FIG. 3B, when the voltage of the battery 170 reaches the discharge completion voltage, the switching control unit 130 and the changeover switch 150 are turned off, the phase control unit 140 is turned on, and the main relay ( 164 maintains the on state and the shorting switch 156 maintains the off state, the battery 170 is discharged by the phase controller 140, the transformer 142 and the second discharge unit of the switchboard 144, and the battery The voltage at 170 gradually decreases from the discharge completion voltage.

Thereafter, when the voltage of the battery 170 becomes the reverse potential voltage, the switching control unit 130, the changeover switch 150, and the shorting switch 156 maintain an off state, and the phase control unit 140 turns off, and the main relay 164 remains on, and the voltage of battery 170 gradually increases from the reverse potential voltage to 0V.

For example, the reverse potential voltage may be a voltage having the same magnitude as the discharge completion voltage and an opposite polarity, and may be about -10V.

As shown in FIG. 3C, when the voltage of the battery 170 becomes 0V, the switching controller 130, the changeover switch 150, and the phase controller 140 maintain an OFF state and the main relay 164 is in an ON state. is maintained, the shorting switch 156 is turned on, and the positive terminal (+) and negative terminal (-) of the battery 170 are shorted.

After the positive terminal (+) and negative terminal (-) of the battery 170 are short-circuited by the shorting switch 156, the battery 170 is removed from the battery discharge device 110 and the positive terminal of the battery 170 ( 0V of the battery 170 being transported may be maintained by attaching a separate short-circuit (not shown) for short-circuiting the +) and negative terminals (-) to the battery 170.

A method of discharging the battery discharging device 110 according to the first embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a flowchart illustrating a method of discharging the battery discharging device according to the first embodiment of the present invention, which will be described with reference to FIGS. 1 to 3C.

As shown in FIG. 4, the battery discharging device 110 according to the first embodiment of the present invention starts a discharging operation (st10).

First, the discharge voltage and discharge current are set (st12), and the discharge operation of the first discharge unit of the switching control unit 130 and the load resistance unit 132 is started (st14).

Thereafter, it is determined whether the current battery 170 voltage is greater than the discharge completion voltage (st16).

As a result of the determination, if the current battery 170 voltage is greater than the discharge completion voltage (Yes), it is determined whether the discharge current of the first discharge unit is less than the set discharge current (st18).

As a result of the determination, if the first discharge unit discharge current is smaller than the set discharge current (Yes), the first discharge unit current control duty is increased (st20) to increase the first discharge unit discharge current, and then the first discharge unit discharges. It returns to the operation start step (st14).

As a result of the determination, if the discharge current of the first discharge unit is not less than the set discharge current (No), it is determined whether the discharge current of the first discharge unit is greater than the set discharge current (st22).

As a result of the determination, if the first discharge unit discharge current is greater than the set discharge current (Yes), the first discharge unit current control duty is reduced (st24) to reduce the first discharge unit discharge current, and then the first discharge unit is discharged. It returns to the operation start step (st14).

Meanwhile, as a result of determining whether the current battery 170 voltage is greater than the discharge completion voltage (st16), if the current battery 170 voltage is not greater than the discharge completion voltage (No), the current battery 170 voltage and the discharge completion voltage It is determined whether the voltages are the same (st26).

As a result of the determination, when the current battery 170 voltage and the discharge completion voltage are the same (Yes), the discharge operation of the first discharge unit is stopped (st28).

Thereafter, the phase controller 140, the transformer 142, and the second discharge unit of the switchboard 144 start a discharge operation (st30).

Then, it is determined whether the current battery 170 voltage is greater than the reverse potential voltage (st32).

As a result of the determination, if the current battery 170 voltage is greater than the reverse potential voltage (Yes), it is determined whether the discharge current of the second discharge unit is less than the set discharge current (st34).

As a result of the determination, if the discharge current of the second discharge unit is smaller than the set discharge current (Yes), the current control duty of the second discharge unit is increased (st36) to increase the discharge current of the second discharge unit, and then discharge of the second discharge unit. It returns to the operation start step (st30).

As a result of the determination, if the discharge current of the second discharge unit is not less than the set discharge current (No), it is determined whether the discharge current of the second discharge unit is greater than the set discharge current (st38).

As a result of the determination, if the discharge current of the second discharge unit is greater than the set discharge current (Yes), the current control duty of the second discharge unit is reduced (st40) to reduce the discharge current of the second discharge unit, and then discharge of the second discharge unit. It returns to the operation start step (st30).

Meanwhile, as a result of determining whether the current battery 170 voltage is greater than the reverse potential voltage (st32), if the current battery 170 voltage is not greater than the reverse potential voltage (No), the current battery 170 voltage and the reverse potential It is determined whether the voltages are the same (st42).

As a result of the determination, when the current battery 170 voltage and the reverse potential voltage are the same (Yes), the discharging operation of the second discharge unit is stopped (st44).

As described above, in the battery discharge device 110 according to the first embodiment of the present invention, the first discharge of the switching control unit 130 and the load resistance unit 132 from the discharge start voltage to the discharge end voltage through the discharge end voltage The battery 170 is discharged by the battery, and the battery 170 is further discharged by the phase control unit 140, the transformer 142, and the second discharge unit of the switchboard 144 from the discharge completion voltage to the reverse potential voltage. , the battery 170 can be short-circuited by the shorting switch 156 when the voltage increases from the reverse potential voltage to 0V.

Accordingly, all charges charged in the battery 170 can be safely removed by the first and second discharge units, and the battery 170 can be completely discharged to 0V.

In addition, convenience of use can be improved by the shorting switch 156.

However, in the battery discharge device 110 according to the first embodiment of the present invention, the first discharge unit stops (st28) after the discharge operation up to the discharge completion voltage of the first discharge unit is completed and before the discharge operation of the second discharge unit starts. At this time, as the load is separated from the battery 170, the voltage of the battery 170 may increase by a certain amount from the discharge completion voltage to become a recovery voltage.

Here, when the recovery voltage of the battery 170 is greater than the secondary side voltage of the transformer 142 of the second discharge unit, the discharge operation of the second discharge unit cannot be started.

In order to improve this, the overlapping range of the discharge completion voltage of the first discharge unit and the secondary side voltage of the transformer 142 of the second discharge unit can be increased so that the second discharge unit can accommodate the recovery voltage of the battery 170, It is difficult to predict the recovery voltage depending on characteristics such as the capacity of the battery 170, and the larger the overlapping range of the operating voltages of the first and second discharge units, the higher the capacity of the transformer 142 of the second discharge unit, thereby reducing the manufacturing cost. can increase

In another embodiment, when switching from the operation of the first discharge unit to the operation of the second discharge unit, the first and second discharge units may operate together without stopping the discharge operation, which will be described with reference to the drawings.

5 is a flowchart for explaining a method of discharging a battery discharge device according to a second embodiment of the present invention. Since the configuration of the battery discharge device is the same as that of the first embodiment, it will be described with reference to FIGS. 1 to 3C. .

As shown in FIG. 5, the battery discharging device 110 according to the second embodiment of the present invention starts a discharging operation (st110).

First, the discharge voltage and discharge current are set (st112), and the discharge operation of the first discharge unit of the switching control unit 130 and the load resistance unit 132 is started (st114).

Thereafter, it is determined whether the current battery 170 voltage is greater than the discharge completion voltage (st116).

As a result of the determination, if the current battery 170 voltage is greater than the discharge completion voltage (Yes), it is determined whether the discharge current of the first discharge unit is less than the set discharge current (st118).

As a result of the determination, if the first discharge unit discharge current is smaller than the set discharge current (Yes), the first discharge unit current control duty is increased (st120) to increase the first discharge unit discharge current, and then the first discharge unit is discharged. Return to the operation start step (st114).

As a result of the determination, if the discharge current of the first discharge unit is not less than the set discharge current (No), it is determined whether the discharge current of the first discharge unit is greater than the set discharge current (st122).

As a result of the determination, if the first discharge unit discharge current is greater than the set discharge current (Yes), the first discharge unit current control duty is reduced (st124) to reduce the first discharge unit discharge current, and then the first discharge unit discharges. Return to the operation start step (st114).

Meanwhile, as a result of determining whether the current battery 170 voltage is greater than the discharge completion voltage (st116), if the current battery 170 voltage is not greater than the discharge completion voltage (No), the current battery 170 voltage and the discharge completion voltage It is determined whether the voltages are the same (st126).

As a result of the determination, when the current battery 170 voltage and the discharge completion voltage are the same (Yes), the discharge operation switching between the first and second discharge units starts (st128).

Thereafter, it is determined whether the discharge current of the first discharge unit is greater than 0 (st130).

As a result of the determination, when the discharge current of the first discharge unit is greater than 0 (Yes), the current control duty of the first discharge unit is reduced (st132) to reduce the discharge current of the first discharge unit.

Thereafter, it is determined whether the discharge current of the second discharge unit is smaller than the set discharge current (st134).

As a result of the determination, when the second discharge unit discharge current is smaller than the set discharge current (Yes), the second discharge unit current control duty is increased (st136) to increase the second discharge unit discharge current.

Meanwhile, as a result of determining whether the discharge current of the first discharge unit is greater than 0 (st130), if the discharge current of the first discharge unit is not greater than 0 (No), the discharge operation of the first discharge unit is stopped ( st138).

Then, it is determined whether the current battery 170 voltage is greater than the reverse potential voltage (st140).

As a result of the determination, if the current battery 170 voltage is greater than the reverse potential voltage (Yes), it is determined whether the discharge current of the second discharge unit is less than the set discharge current (st142).

As a result of the determination, if the discharge current of the second discharge unit is smaller than the set discharge current (Yes), the current control duty of the second discharge unit is increased (st144) to increase the discharge current of the second discharge unit, and then discharge of the first discharge unit. It returns to the operation stop step (st138).

As a result of the determination, if the discharge current of the second discharge unit is not smaller than the set discharge current (No), it is determined whether the discharge current of the second discharge unit is greater than the set discharge current (st146).

As a result of the determination, if the discharge current of the second discharge unit is greater than the set discharge current (Yes), the current control duty of the second discharge unit is reduced (st148) to reduce the discharge current of the second discharge unit, and then discharge of the first discharge unit. It returns to the operation stop step (st138).

Meanwhile, as a result of determining whether the current battery 170 voltage is greater than the reverse potential voltage (st140), if the current battery 170 voltage is not greater than the reverse potential voltage (No), the current battery 170 voltage and the reverse potential It is determined whether the voltages are the same (st150).

As a result of the determination, when the current battery 170 voltage and the reverse potential voltage are the same (Yes), the discharging operation of the second discharge unit is stopped (st152).

As described above, in the battery discharge device 110 according to the second embodiment of the present invention, the first discharge of the switching control unit 130 and the load resistance unit 132 from the discharge start voltage to the discharge end voltage through the discharge end voltage. The battery 170 is discharged by the battery, and the battery 170 is further discharged by the phase controller 140, the transformer 142, and the second discharge unit of the switchboard 144 from the discharge completion voltage to the reverse potential voltage. , the battery 170 can be short-circuited by the shorting switch 156 when the voltage increases from the reverse potential voltage to 0V.

Accordingly, all charges charged in the battery 170 can be safely removed by the first and second discharge units, and the battery 170 can be completely discharged to 0V.

In addition, convenience of use can be improved by the shorting switch 156.

And, instead of stopping the first discharge unit when the discharge operation of the first discharge unit is completed, the first and second discharge units are operated together, and the discharge operation of the first discharge unit is stopped after the discharge operation of the second discharge unit starts. By doing so, it is possible to smoothly switch the discharge operation between the first and second discharge units and reduce manufacturing cost.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the technical spirit and scope of the present invention described in the claims below. You will understand that it can be done.

110: battery discharge device 120: main control unit
130: switching control unit 132: load resistance unit
140: phase control unit 142: transformer
144: switchboard 150: changeover switch
156: short circuit switch

Claims (10)

a main control unit;
a first discharge unit for discharging the battery from a discharge start voltage to a discharge end voltage under the control of the main controller;
a second discharge unit for discharging the battery from the discharge completion voltage to a reverse potential voltage under the control of the main controller;
A shorting switch for shorting the battery under the control of the main controller when the voltage of the battery increases from the reverse potential voltage to 0V
Battery discharge device comprising a.
According to claim 1,
The first discharge unit,
a switching control unit connected to the battery;
A load resistance unit connected between the switching control unit and the battery to provide different resistance values
Battery discharge device comprising a.
According to claim 2,
The battery discharge device according to claim 1, wherein the switching control unit includes at least one insulated gate bipolar transistor (IGBT).
According to claim 2,
The load resistance unit includes a plurality of resistors having different resistance values and a plurality of switches connected to both ends of at least one of the plurality of resistors, respectively.
According to claim 1,
The second discharge unit,
a phase controller connected to the battery;
a transformer having a secondary side connected to the phase controller;
A switchboard connected to the primary side of the transformer
A battery discharge device comprising a.
According to claim 5,
The phase control unit includes at least one silicon-controlled rectifier (SCR).
According to claim 6,
The at least one silicon-controlled rectifier comprises four silicon-controlled rectifiers connected to each other in a bridge form.
discharging the battery from a discharge start voltage to a discharge end voltage by a first discharge unit;
discharging the battery from the discharge completion voltage to a reverse potential voltage by a second discharge unit;
Short-circuiting the battery when the voltage of the battery increases from the reverse potential voltage to 0V by a short-circuit switch
Battery discharge method comprising a.
According to claim 8,
The step of discharging the battery by the first discharging unit,
setting the switching control unit of the first discharge unit to be in an on state and the phase control unit of the second discharge unit to be in an off state;
providing different resistance values to the load resistance unit of the first discharge unit;
including,
The step of discharging the battery by the second discharging unit,
causing the switching control unit of the first discharge unit to have an off state and the phase control unit of the second discharge unit to have an on state;
Step of causing the phase control unit of the second discharge unit to be in an off state when the battery becomes the reverse potential voltage
Battery discharge method comprising a.
According to claim 8,
Between discharging the battery by the first discharging unit and discharging the battery by the second discharging unit,
operating the first and second discharge units together;
Stopping the first discharge unit
A battery discharge method further comprising a.