KR20230129938A - Battery Discharge Apparatus And Discharging Method Thereof - Google Patents

Abstract

The present invention includes a main control unit; a first discharge unit that discharges the battery from a first voltage to a second voltage under the control of the main control unit; a second discharge unit discharging the battery from the second voltage to a third voltage under the control of the main control unit; a third discharge unit that discharges the battery from the third voltage to the fourth voltage under the control of the main control unit; A battery discharge device is provided that includes a short-circuit switch that short-circuits the battery under the control of the main control unit when the voltage of the battery increases from the fourth voltage to 0V.

Description

Battery Discharge Apparatus And Discharging Method Thereof}

The present invention relates to a battery discharge device, and in particular, a battery discharge device capable of discharging from a first voltage of high potential through a second voltage of medium potential and a third voltage of low potential to a fourth voltage of reverse potential, and a battery discharge device capable of discharging the same. It's about method.

In general, vehicles using internal combustion engines that use gasoline or heavy oil as their main fuel have a serious impact on the generation of air pollution and other pollution. Accordingly, in recent years, much effort has been made in the development of electric vehicles or hybrid vehicles to reduce pollution.

In particular, an electric vehicle is a vehicle that uses a battery engine that operates by electrical energy output from a battery, and its main power source is a battery made up of a number of battery cells that can be charged and discharged in one pack. Because it is used, it has the advantage of producing no exhaust gases and making very little noise.

Batteries, which are secondary storage batteries, are discharged using a discharge device for testing, reuse, or recycling.

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

Additionally, when disassembling a battery that has completed its life and recycling the materials, the detached battery is discharged to a voltage lower than the end-of-discharge voltage and transported with a total voltage of 0V.

In this way, to ensure electrical safety, the detached battery is discharged through a discharge device.

In particular, batteries for material recycling are discharged by immersing them in salt water. This salt water immersion discharge has problems of poor workability, increased discharge time, and increased discharge costs due to additional equipment.

Meanwhile, when discharging a battery with a high potential first voltage, energy corresponding to the high potential first voltage is released as heat, resulting in energy loss.

And, even after discharging the battery to a total voltage of OV, if the discharge device is removed, the voltage increases again. To prevent this phenomenon, short-circuit the positive and negative terminals of the battery when the total voltage is 0V ( short).

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

The present invention is intended to solve this problem, and the first discharge unit operates between the first voltage of high potential and the second voltage of medium potential, and the second discharge unit operates between the second voltage of medium potential and the third voltage of low potential. A battery discharge device in which residual energy is reduced, stability is improved, discharge time and discharge cost are reduced, and convenience is improved by operating the discharge unit between the third voltage of low potential and the fourth voltage of reverse potential. The purpose is to provide a method for discharging the same.

In order to achieve the above object, the present invention includes a main control unit; a first discharge unit that discharges the battery from a first voltage to a second voltage under the control of the main control unit; a second discharge unit discharging the battery from the second voltage to a third voltage under the control of the main control unit; a third discharge unit that discharges the battery from the third voltage to the fourth voltage under the control of the main control unit; A battery discharge device is provided that includes a short-circuit switch that short-circuits the battery under the control of the main control unit when the voltage of the battery increases from the fourth voltage to 0V.

In addition, the first discharge unit may include an AC conversion unit connected between the battery and the AC system to supply the voltage of the battery to the AC system.

In addition, the first and second voltages are the highest charging voltage and the discharge start voltage, respectively, and the AC converter converts the DC voltage of the battery into an AC voltage when the voltage of the battery is in the range between the first and second voltages. It can be converted into and supplied to the AC system.

And, the second discharge unit includes a switching control unit connected to the battery; It may include a load resistance unit connected between the switching control unit and the battery to provide different resistance values.

Additionally, the switching control unit may include at least one insulated gate bipolar transistor (IGBT).

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

In addition, the second and third voltages are a discharge start voltage and a discharge completion voltage, respectively, and the switching control unit connects the load resistor to the battery when the voltage of the battery is in the range between the second and third voltages. You can.

In addition, the third discharge unit may include a negative power load unit connected to the battery and discharging the battery to the fourth voltage of negative reverse potential.

In addition, the third voltage is the discharge completion voltage, and the negative power load unit discharges the battery so that the voltage of the battery becomes the fourth voltage when the voltage of the battery is in the range between the third and fourth voltages. can do.

And, the negative power load unit includes a phase control unit connected to the battery; A transformer whose secondary side is connected to the phase control unit; It may include a distribution board connected to the primary side of the transformer.

The present invention discharges a battery using a first discharge unit between a first voltage of high potential and a second voltage of medium potential, and uses a second discharge unit between a second voltage of medium potential and a third voltage of low potential. By discharging the battery using the third discharge unit between the third voltage of low potential and the fourth voltage of reverse potential, residual energy is reduced, stability is improved, discharge time and discharge cost are reduced, and convenience is reduced. This has an improving effect.

In particular, energy efficiency can be improved by reducing the remaining energy corresponding to the first voltage of high potential through the first discharge unit.

In addition, a complete 0V discharge of the battery is possible through reverse potential discharge, which was not possible with existing discharge devices, and is of course superior in time and economic effectiveness compared to the existing discharge method of completely discharging the battery by precipitating it in salt water for recycling. The problem of disposing of used brine can also be completely solved.

In addition, when the battery is detachable for repair or replacement in an electric vehicle, it is essential to discharge the battery. At this time, it is possible to discharge to the desired voltage with a constant current desired by the user, so the performance of the battery can be checked. In addition, discharging may be performed to determine whether the battery can be reused, and additional discharging may be performed for immediate disposal if the battery does not meet the required performance. 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 discharge device according to a first embodiment of the present invention.
Figure 2 is a circuit diagram showing a battery discharge device according to the first embodiment of the present invention.
Figure 3 is a graph showing the operating state of the battery discharge device and the voltage of the battery according to the first embodiment of the present invention.
4A to 4D are diagrams for explaining the operation of the battery discharge device according to the first embodiment of the present invention.

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

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

As shown in FIG. 1, the battery discharge device 110 according to an embodiment of the present invention includes a main control unit 120, an AC conversion unit 130, a switching control unit 140, a load resistance unit 142, and a It includes a power load unit 150, a changeover switch 160, a current detection unit 162, a voltage detection unit 164, and a short circuit switch 166. The AC conversion unit 130 constitutes a first discharge unit, and the switching control unit ( 140) and the load resistance unit 142 constitute a second discharge unit, and the negative power load unit 150 constitutes a third discharge unit.

Specifically, the main control unit 120 is connected to the voltage detection unit 164 and the current detection unit 162 to receive the detected voltage and current of the battery 180, and the AC conversion unit 130 and the switching control unit 140. And it is connected to the negative power load unit 150 to control the AC converter 130, the switching control unit 140, and the negative power load unit 150 according to the detected voltage and current of the battery 180.

For example, the main control unit 120, if the detected voltage of the battery 180 is in the range between the first voltage of high potential, which is the highest charging voltage, and the second voltage of medium potential, which is the discharge start voltage, the AC conversion unit ( 130) operates and controls the switching control unit 140 and the negative power load unit 150 to stop operation, and the detected voltage of the battery 180 is a second voltage of medium potential and a third low potential that is the discharge completion voltage. If the voltage is in the range, the switching control unit 140 operates and controls the AC converter 130 and the negative power load unit 150 to stop operation, and the detected voltage of the battery 180 is a low-potential third voltage. If it is in the range between the fourth voltage of the negative polarity reverse potential, the negative power load unit 150 operates and the AC converter 130 and the switching control unit 140 can be controlled to stop operating.

Here, the third voltage, which is the discharge completion voltage, is a voltage smaller than the discharge end voltage, and the discharge end voltage may be a voltage corresponding to the state of 0% charging rate specified to prevent overdischarge.

The AC conversion unit 130 is connected between the positive terminal (+) of the battery 170, the current detection unit 162, and the AC system (or AC load) (not shown) and is connected to the battery (not shown) under the control of the main control unit 120. 180) is converted to voltage and supplied to the AC system.

For example, the AC converter 130 converts the DC voltage of the battery 180 to AC when the detected voltage of the battery 180 is in the range between the first voltage, which is the highest charging voltage, and the second voltage, which is the discharge start voltage. It can be converted to voltage and supplied to the AC system.

Additionally, the AC conversion unit 130 may be an inverter that converts direct current voltage to alternating current voltage, and the alternating current system may be an alternating current motor, an alternating current transmission and distribution line, and an alternating current load.

The switching control unit 140 is connected between the load resistance unit 142 and the current detection unit 162 and controls the connection of the load resistance unit 142 and the current detection unit 162 under the control of the main control unit 120.

For example, the switching control unit 140, when the detected voltage of the battery 180 is in the range between the second voltage, which is the discharge start voltage, and the third voltage, which is the discharge completion voltage, the load resistance unit 142 and the current detection unit ( 162) can be controlled to be connected so that the load resistance unit 142 can be connected to the battery 180.

The switching control unit 140 may include a plurality of high-capacity switching elements such as insulated gate bipolar transistors (IGBTs), and the plurality of high-capacity switching elements may be connected in parallel and driven alternately.

The load resistance unit 142 is connected between the switching control unit 140 and the changeover switch 160 and adjusts the resistance value of the load resistor so that the battery 180 is discharged to an optimal state under the control of the main control unit 120. .

For example, the load resistance unit 142 may have different resistance values depending on the current and voltage of the battery 180.

The negative power load unit 150 is connected between the positive terminal (+) of the battery 180 and the current detection unit 162, so that the battery 180 reaches the fourth voltage of the negative reverse potential under the control of the main control unit 120. Let it discharge.

For example, the negative power load unit 150 discharges the battery 180 when the detected voltage of the battery 180 is in the range between the third voltage, which is the discharge completion voltage, and the fourth voltage, which is the negative polarity reverse potential. It can be set to 4 voltage.

In addition, the negative power load unit 150 may include a phase control unit, a transformer, and a distribution board. The phase control unit may include a switching element such as a silicon-controlled rectifier (SCR), and a transformer and a distribution board (power grid) can be sequentially connected to the phase control unit to supply power to the phase control unit.

Here, the third voltage of low potential, which is the discharge completion voltage, and the fourth voltage of reverse potential may be voltages of the same size and opposite polarity. The first voltage, which is the highest charging voltage, is about 800 V, and the first voltage, which is the discharge start voltage, is about 800 V. The second voltage is about 500V, the discharge end voltage is about 250V, the third voltage, which is the discharge completion voltage, is about 10V, and the fourth voltage of the reverse potential can be about -10V.

The switching switch 160 is connected between the load resistance unit 142 and the positive terminal (+) of the battery 180 and switches between the positive terminal (+) of the load resistance unit 142 and the battery 180 under the control of the main control unit 120. By controlling the (+) connection, the operation of the first to third discharge units is switched.

For example, the switching switch 160 switches under the control of the main control unit 120 when the detected voltage of the battery 180 is in the range between the first voltage, which is the highest charging voltage, and the second voltage, which is the discharge start voltage. The control unit 140 and the load resistance unit 142 are separated from the battery 180 so that the battery 180 is discharged by the first discharge unit, and the detected voltage of the battery 180 is the second voltage, which is the discharge start voltage. If the range is between the third voltage, which is the discharge completion voltage, the switching control unit 140 and the load resistance unit 142 are connected to the battery 180 so that the battery 180 is discharged by the second discharge unit, and the detected When the voltage of the battery 180 is in the range between the third voltage, which is the discharge completion voltage, and the fourth voltage, which is the negative polarity reverse potential, the switching control unit 140 and the load resistance unit 142 are operated under the control of the main control unit 120. By separating from the battery 180, the battery 180 can be discharged by the third discharge unit.

The current detection unit 162 is connected to the negative terminal (-) of the battery 180 and detects the current of the battery 180, and the voltage detection unit 164 is connected to the positive terminal (+) and negative terminal (-) of the battery 180. ) is connected to detect the voltage of the battery 180, and the current detection unit 162 and voltage detection unit 164 transmit the detected voltage and current of the battery 180 to the main control unit 120.

The short circuit switch 166 is connected between the positive terminal (+) and negative terminal (-) of the battery 180 and switches between the positive terminal (+) and negative terminal (-) of the battery 180 under the control of the main control unit 120. ) controls the connection.

For example, the short circuit switch 166 allows the detected voltage of the battery 180 to pass from the first voltage, which is the highest charging voltage, to the second voltage, which is the discharge start voltage, and the third voltage, which is the discharge completion voltage, to change the negative polarity reverse potential. The positive terminal (+) and negative terminal (-) of the battery 180 are disconnected (open) until the fourth voltage decreases and then increases again until it reaches 0V, and the detected voltage of the battery 180 reverses to negative polarity. When the above fourth voltage increases to 0V, the positive terminal (+) and negative terminal (-) of the battery 180 can be shorted.

As described above, in the battery discharge device 110 according to an embodiment of the present invention, the battery 180 starts discharging from a first voltage of a high potential, which is the highest charging voltage, by the first discharge unit of the AC converter 130. It is discharged to the second voltage of medium potential, which is the voltage, and the battery 180 is discharged from the second voltage of medium potential, which is the discharge start voltage, to the end-of-discharge voltage by the second discharge unit of the switching control unit 140 and the load resistance unit 142. It is discharged to a low-potential third voltage, which is the discharge completion voltage, and is discharged from the low-potential third voltage, which is the discharge completion voltage, to the negative polarity reverse potential fourth voltage by the third discharge part of the negative power load unit 150. When the battery 180 is discharged and the voltage of the battery 180 becomes 0V by the short circuit switch 166, the positive terminal (+) and negative terminal (-) of the battery 180 are short-circuited.

Accordingly, the stability of the battery 180 is improved, the discharging time and discharging cost for the battery 180 are reduced, and the convenience of the battery 180 discharging process is improved.

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

Figure 2 is a circuit diagram showing a battery discharge device according to an embodiment of the present invention, and description of the same parts as Figure 1 will be omitted.

As shown in FIG. 2, the battery discharge device 110 according to an embodiment of the present invention includes an alternating current conversion unit 130, a switching control unit 140, a load resistance unit 142, a negative power load unit 150, It includes a changeover switch 160, a current detection unit 162, a short circuit switch 166, a reactor 170, a diode 172, a main relay 174, and a fuse 176.

The AC conversion unit 130 controls the connection between the battery 180 and the AC system under the control of the main control unit (120 in FIG. 1).

For example, the AC converter 130 may be an inverter that converts direct current voltage to alternating current voltage.

The AC conversion unit 130 constitutes a first discharge unit.

The switching control unit 140 controls the load resistance unit 142 and the battery 180 through the transfer switch 160, current detection unit 162, main relay 174, and fuse 176 under the control of the main control unit 120. Controls the connection.

For example, the switching control unit 140 may include a plurality of insulated gate bipolar transistors (IGBTs) connected in parallel to each other.

The load resistance unit 142 adjusts the resistance value of the load resistor connected to the battery 180 under the control of the main control unit 120.

For example, the load resistance unit 142 includes first to fifth resistors (R1 to R5) connected in series or parallel and having different resistance values, and both ends of the first to fifth resistors (R1 to R5). It may include connected first to fourth switches (s1 to s4).

The first to fourth resistors (R1 to R4) and the three fifth resistors (R5) are sequentially connected to the changeover switch 160, and the first to third switches (s1 to s3) are respectively connected to the second to third resistors (R5). It is connected to both ends of four resistors (R2 to R4), and the fourth switch (s4) can be connected to both ends of three fifth resistors (R5).

The load resistance unit 142 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 142 has a resistance value of “R1 + R3 + 3R5”, and the first to fourth switches (s1 to s4) are on, off, on, and off, respectively. When the fourth switches s1 to s4 are on, on, off, and on, respectively, the load resistance unit 132 may have a resistance value of “R1 + R4”.

The switching control unit 140 and the load resistance unit 142 may form a second discharge unit.

The negative power load unit 150 controls the connection of the positive terminal (+) and negative terminal (-) of the battery 180 under the control of the main control unit 120.

For example, the negative power load unit 150 may include a phase control unit, a transformer, and a distribution board, and the phase control unit connects the positive electrode of the battery 180 through the current detection unit 162, the main relay 174, and the fuse 176. The connection of the terminal (+) and negative terminal (-) can be controlled.

Additionally, the phase control unit may include four silicon-controlled rectifiers (SCR) connected to each other in a bridge form.

The secondary side of the transformer may be connected to the input terminal of the bridge, and the distribution board may be connected to the primary side of the transformer.

The phase control unit can reduce the discharge completion voltage of the battery 180 to the reverse potential voltage using a transformer and a distribution board.

For example, the transformer outputs alternating voltage of positive and negative polarity depending on the input voltage of the switchboard and transmits it to the input terminal of the bridge of the phase control unit. Then, the phase control unit, after being turned on under the control of the main control unit 120, turns on the positive terminal (+) of the battery 180 when the voltage of the positive terminal (+) of the battery 180 is greater than the secondary voltage of the transformer. By maintaining the on state connecting the +) and negative terminal (-), the voltage of the positive terminal (+) of the battery 180 decreases, and the voltage of the positive terminal (+) of the battery 180 becomes the secondary voltage of the transformer. If it is equal to or smaller than , the positive terminal (+) and negative terminal (-) of the battery 180 are turned off, thereby stopping the decrease in the voltage of the positive terminal (+) of the battery 180.

The negative power load unit 150 constitutes a third discharge unit.

The switching switch 160 is turned on under the control of the main control unit 120 so that the battery 180 is discharged by the second discharge unit including the switching control unit 140 and the load resistance unit 142, Under the control of the main control unit 120, the battery 180 can be turned off and discharged by the third discharge unit of the negative power load unit 150.

The reactor 170 serves to remove harmonic components of the current and voltage of the battery 180, and the diode 172 may serve to block the reverse voltage of the battery 180.

The main relay 174 serves to start or stop the operation of the battery discharge device 110, and the fuse 176 may serve to block the inflow of abnormal voltage and current.

This battery discharge device 110 discharges the battery 180 by the first discharge unit from the first voltage of high potential, which is the highest charging voltage, to the second voltage of medium potential, which is the discharge start voltage, and discharges the battery 180 to the medium voltage, which is the discharge start voltage. The battery 180 is discharged by the second discharge unit from the above second voltage through the discharge end voltage to a low-potential third voltage that is the discharge completion voltage, and negative polarity is generated from the low-potential third voltage that is the discharge completion voltage. The battery 180 is further discharged by the third discharge unit up to the fourth voltage of the reverse potential, and when the voltage increases from the fourth voltage of the negative reverse potential to 0V, the battery 180 is discharged by the short-circuit switch 166. ) can be short-circuited, which will be explained with reference to the drawings.

Figure 3 is a graph showing the operating state of the battery discharge device and the voltage of the battery according to an embodiment of the present invention, and Figures 4A to 4D are diagrams for explaining the operation of the battery discharge device according to an embodiment of the present invention. , descriptions of the same parts as those in FIGS. 1 and 2 are omitted.

As shown in FIGS. 3 and 4A, when the battery discharge device 110 according to an embodiment of the present invention is operated, the main relay 174 is turned on and the switching control unit 140, the changeover switch 160, The negative power load unit 150 and the short circuit switch 166 are turned off, and the battery 180 is discharged by the first discharge unit of the AC converter 130, so that the voltage of the battery 180 is the first highest charging voltage. It gradually decreases from the first voltage (V1) of high potential to the second voltage (V2) of medium potential, which is the discharge start voltage.

For example, the first voltage (V1), which is the highest charging voltage, may be about 800V, and the second voltage (V2), which is the discharge start voltage, may be about 500V.

As shown in Figures 3 and 4b, when the voltage of the battery 180 reaches the second voltage (V2), which is the discharge start voltage, the switching control unit 140, the changeover switch 160, and the main relay 174 respectively turns on, the AC converter 130 and the negative power load unit 150 turn off, and the battery 180 is discharged by the second discharge unit of the switching control unit 140 and the load resistor unit 142, thereby discharging the battery. The voltage at (180) gradually decreases from the middle voltage second voltage V2, which is the discharge start voltage, to the low potential third voltage V3, which is the discharge completion voltage, through the discharge end voltage.

For example, the discharge end voltage may be about 250V, and the third voltage (V3), which is the discharge completion voltage, may be about 10V.

At this time, the first to fourth switches s1 to s4 of the load resistance unit 142 may be in an on or off state, respectively.

As shown in FIGS. 3 and 4C, when the voltage of the battery 180 reaches the third voltage (V4), which is the discharge completion voltage, the switching control unit 140 and the conversion switch 160 are turned off and the negative power load unit is turned off. (150) is turned on, the main relay 174 remains turned on, the short circuit switch 166 remains turned off, and the battery 180 is discharged by the third discharge unit of the negative power load unit 150. Thus, the voltage of the battery 180 gradually decreases from the low-potential third voltage V3, which is the discharge completion voltage.

Thereafter, when the voltage of the battery 180 becomes the fourth voltage (V4) of the negative polarity reverse potential, the switching control unit 140, the changeover switch 160, and the short circuit switch 166 remain in the off state and the negative power load unit ( 150) is turned off, the main relay 174 remains turned on, and the voltage of the battery 180 gradually increases from the fourth voltage V4 of the negative polarity reverse potential to 0V.

For example, the fourth voltage V4 of the negative polarity reverse potential may have the same magnitude and opposite polarity as the third voltage V3, which is the discharge completion voltage, and may be about -10V.

As shown in FIGS. 3 and 4D, when the voltage of the battery 180 becomes 0V, the switching control unit 140, the changeover switch 160, and the negative power load unit 150 remain in the off state and the main relay 174 ) remains on, the short circuit switch 166 is turned on, and the positive terminal (+) and negative terminal (-) of the battery 180 are shorted.

After the positive terminal (+) and negative terminal (-) of the battery 180 are short-circuited by the short-circuit switch 166, the battery 180 is removed from the battery discharge device 110 and the positive terminal of the battery 180 is ( A separate shorting unit (not shown) that shorts the +) and negative terminals (-) can be attached to the battery 180 to maintain 0V of the battery 180 being transported.

Meanwhile, the battery discharge device 110 according to the first embodiment of the present invention may further include an uninterrupted power supply (UPS).

That is, when the second discharge unit operates, heat is generated in the load resistor unit 142, and the fan operates to cool this heat. However, if an unscheduled power outage occurs, the heat in the load resistor unit 142 is not cooled. Otherwise, the battery discharge device 110 may be damaged.

In the battery discharge device 110 according to an embodiment of the present invention, the uninterruptible power supply (UPS) supplies power to the fan even when an unscheduled power outage occurs, thereby preventing damage to the battery discharge device 110. .

A discharging method of the battery discharging device 110 according to this embodiment of the present invention will be described.

The battery discharge device 110 according to an embodiment of the present invention starts a discharge operation.

First, the discharge voltage and discharge current are set, and the discharge operation of the first discharge unit of the AC converter 120 begins.

Afterwards, it is determined whether the current voltage of the battery 180 is greater than the second voltage (V2) of the middle potential, which is the discharge start voltage.

As a result of the determination, if the current voltage of the battery 180 is greater than the second voltage (V2), it is determined whether the discharge current of the first discharge unit is less than the set discharge current.

As a result of the judgment, if the discharge current of the first discharge unit is smaller than the set discharge current, the current control duty of the first discharge unit is increased to increase the discharge current of the first discharge unit, and then the discharge operation of the first discharge unit is started. Go back to

As a result of the determination, if the discharge current of the first discharge unit is not less than the set discharge current, it is determined whether the discharge current of the first discharge unit is greater than the set discharge current.

As a result of the determination, if the discharge current of the first discharge unit is greater than the set discharge current, the current control duty of the first discharge unit is reduced to reduce the discharge current of the first discharge unit, and then the discharge operation of the first discharge unit is started. Go back to

Meanwhile, as a result of determining whether the current battery 180 voltage is greater than the discharge completion voltage, if the current battery 180 voltage is not greater than the discharge completion voltage, the voltage of the current battery 180 and the second voltage, which is the discharge start voltage, Determine whether (V2) is the same.

As a result of the determination, if the current voltage of the battery 180 and the second voltage V2, which is the discharge start voltage, are the same, the discharging operation of the first discharge unit is stopped, and the switching control unit 140 and the load resistance unit 142 are operated. 2. The discharge operation of the discharge part begins.

Afterwards, it is determined whether the current voltage of the battery 180 is greater than the third voltage V3, which is the discharge completion voltage.

As a result of the determination, if the current voltage of the battery 180 is greater than the third voltage V3, which is the discharge completion voltage, it is determined whether the discharge current of the second discharge unit is less than the set discharge current.

As a result of the judgment, if the discharge current of the second discharge unit is smaller than the set discharge current, the current control duty of the second discharge unit is increased to increase the discharge current of the second discharge unit, and then the discharge operation of the second discharge unit is started. Go back to

As a result of the determination, if the discharge current of the second discharge unit is not less than the set discharge current, it is determined whether the discharge current of the second discharge unit is greater than the set discharge current.

As a result of the determination, if the discharge current of the second discharge unit is greater than the set discharge current, the current control duty of the second discharge unit is reduced to reduce the discharge current of the second discharge unit, and then the discharge operation of the second discharge unit is started. Go back to

Meanwhile, as a result of determining whether the current voltage of the battery 180 is greater than the third voltage (V3), which is the discharge completion voltage, if the current voltage of the battery 180 is not greater than the third voltage (V3), which is the discharge completion voltage. , it is determined whether the current voltage of the battery 180 and the third voltage V3, which is the discharge completion voltage, are the same.

As a result of the determination, if the current voltage of the battery 180 and the third voltage V3, which is the discharge completion voltage, are the same, the discharge operation of the second discharge unit is stopped, and the discharge operation of the third discharge unit of the negative power load unit 150 is started. Start.

Afterwards, it is determined whether the current voltage of the battery 180 is greater than the fourth voltage V4 of the negative polarity reverse potential.

As a result of the determination, if the current voltage of the battery 180 is greater than the fourth voltage (V4) of the reverse potential, it is determined whether the discharge current of the third discharge unit is less than the set discharge current.

As a result of the judgment, if the discharge current of the third discharge unit is smaller than the set discharge current, the current control duty of the third discharge unit is increased to increase the discharge current of the third discharge unit, and then the discharge operation of the third discharge unit is started. Go back to

As a result of the determination, if the discharge current of the third discharge unit is not less than the set discharge current, it is determined whether the discharge current of the third discharge unit is greater than the set discharge current.

As a result of the judgment, if the discharge current of the third discharge unit is greater than the set discharge current, the current control duty of the third discharge unit is reduced to reduce the discharge current of the third discharge unit, and then the discharge operation of the third discharge unit is started. Go back to

Meanwhile, as a result of determining whether the voltage of the current battery 180 is greater than the fourth voltage (V4) of the reverse potential, if the voltage of the current battery 180 is not greater than the fourth voltage (V4) of the reverse potential, the current It is determined whether the voltage of the battery 180 and the fourth voltage (V4) of the reverse potential are the same.

As a result of the determination, if the current voltage of the battery 180 and the fourth voltage (V4) of the reverse potential are the same, the discharging operation of the third discharge unit is stopped.

As described above, in the battery discharge device 110 according to the embodiment of the present invention, the battery 180 is discharged from the first voltage of high potential, which is the highest charging voltage, to the second voltage of medium potential, which is the discharge start voltage, by the first discharge unit. The battery 180 is discharged by the second discharge unit from the second voltage of medium potential, which is the discharge start voltage, to the third voltage of low potential, which is the discharge completion voltage, through the discharge end voltage. The battery 180 is further discharged by the third discharge unit from the second voltage of low potential to the fourth voltage of negative reverse potential, and when the voltage increases from the fourth voltage of negative polarity reverse potential to 0V, it is short-circuited. The battery 180 can be short-circuited by the switch 166.

Accordingly, by the first to third discharge units, all charges charged in the battery 180 can be recycled or safely removed, and the battery 180 can be completely discharged to 0V.

Additionally, convenience of use can be improved by using the short-circuit switch 166.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the technical spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

110: Battery discharge device 120: Main control unit
130: AC conversion unit 140: Switching control unit
142: load resistance unit 150: negative power load unit
160: Conversion switch 166: Short circuit switch

Claims (10)

a main control unit;
a first discharge unit that discharges the battery from a first voltage to a second voltage under the control of the main control unit;
a second discharge unit discharging the battery from the second voltage to a third voltage under the control of the main control unit;
a third discharge unit that discharges the battery from the third voltage to the fourth voltage under the control of the main control unit;
A short-circuit switch that short-circuits the battery under the control of the main control unit when the voltage of the battery increases from the fourth voltage to 0V.
A battery discharge device including a.
According to claim 1,
A battery discharging device wherein the first discharging unit includes an alternating current conversion unit connected between the battery and an alternating current system to supply the voltage of the battery to the alternating current system.
According to claim 2,
The first and second voltages are the highest charging voltage and the discharge start voltage, respectively,
The AC conversion unit is a battery discharge device that converts the DC voltage of the battery into AC voltage and supplies it to the AC system when the voltage of the battery is in the range between the first and second voltages.
According to claim 1,
The second 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.
A battery discharge device including a.
According to claim 4,
The switching control unit is a battery discharge device including at least one insulated gate bipolar transistor (IGBT).
According to claim 4,
The load resistance unit is a battery discharge device including a plurality of resistors having different resistance values, and a plurality of switches each connected to at least one both ends of the plurality of resistors.
According to claim 4,
The second and third voltages are a discharge start voltage and a discharge completion voltage, respectively,
The switching control unit connects the load resistor unit to the battery when the voltage of the battery is in a range between the second and third voltages.
According to claim 1,
The third discharge unit is a battery discharge device including a negative power load unit connected to the battery and discharging the battery to the fourth voltage of the negative polarity reverse potential.
According to claim 8,
The third voltage is the discharge completion voltage,
The negative power load unit is a battery discharge device that discharges the battery so that the voltage of the battery becomes the fourth voltage when the voltage of the battery is in a range between the third and fourth voltages.
According to claim 8,
The negative power load part,
a phase control unit connected to the battery;
A transformer whose secondary side is connected to the phase control unit;
Distribution board connected to the primary side of the transformer
A battery discharge device including a.