CN116529979A

CN116529979A - Battery discharging device and discharging method thereof

Info

Publication number: CN116529979A
Application number: CN202180074708.XA
Authority: CN
Inventors: 韩延洙; 愼恩晟
Original assignee: Ma Louwen Ltd
Current assignee: Ma Louwen Ltd
Priority date: 2020-11-03
Filing date: 2021-11-02
Publication date: 2023-08-01

Abstract

The invention provides a battery discharging device, which comprises: a main control unit; a first discharging part for discharging the battery from the discharge starting voltage to the discharged voltage according to the control of the main control part; a second discharging unit for discharging the battery from the discharged voltage to a reverse bit voltage according to the control of the main control unit; and a short-circuit switch for shorting the battery under control of the main control unit when the voltage of the battery is increased from the reverse bit voltage to 0V.

Description

Battery discharging device and discharging method thereof

Technical Field

The present invention relates to a battery discharging device, and more particularly, to a battery discharging device capable of discharging to a negative polarity inversion voltage below a discharged voltage and a discharging method thereof.

Background

In general, an automobile using an internal combustion engine using gasoline or heavy oil as a main fuel seriously affects the occurrence of pollution such as atmospheric pollution.

Accordingly, recently, in order to reduce the occurrence of pollution, efforts have been made to develop electric vehicles or hybrid (hybrid) vehicles.

In particular, an electric vehicle is a battery-powered vehicle that uses electric energy from a battery (battery), and since a plurality of battery cells (cells) that can be charged and discharged use a battery formed of one battery pack (pack) as a main power source, there is no exhaust gas at all, and there is an advantage that noise is very small.

Secondary battery cells are discharged for testing, reuse, or reuse using a discharge device.

For example, when performance test is performed on a battery in question or the battery being used is reused for other devices, the detachable battery is discharged to a discharge end voltage and transported in a state where the charging rate is 0%.

In addition, when decomposing the battery at the end of life and recycling the material, the detachable battery is discharged to a voltage lower than the discharge end voltage and transported in a state where the total voltage is 0V (Zero-voltage).

As described above, in order to secure electrical safety, the detachable battery is discharged through the discharging device.

In particular, a battery for recycling materials is discharged by immersing in saline water, which has problems of poor workability, increased discharge time, and increased discharge costs due to additional equipment.

On the other hand, if the discharge device is removed after the battery is discharged in a state where the total voltage is 0V, a phenomenon in which the voltage increases again occurs, and in order to prevent this, the positive electrode terminal and the negative electrode terminal of the battery are short-circuited (short) in a state where the total voltage is 0V.

However, even in a state where the total voltage of the battery is 0V, some of the plurality of cells (cells) in which the battery is connected in series may be in a reverse state, and in this case, there is a problem in that there is a risk of an accident due to a short circuit between the positive electrode terminal and the negative electrode terminal.

Disclosure of Invention

Technical proposal

The present invention has been made to solve the above problems, and an object of the present invention is to provide a battery discharging device and a discharging method thereof, which have improved stability, reduced discharging time and discharging cost, and improved convenience, by discharging a battery to a negative polarity reverse conversion voltage lower than the discharged voltage by a first discharging unit and discharging the battery to a discharged voltage by a second discharging unit

It is an object of the disclosed invention to provide a lifting device for a vehicle which can stably lift the vehicle in one pillar manner, thereby contributing to cost reduction and minimizing an interference area during maintenance and a car washing operation.

Means for solving the problems

In order to achieve the object, the present invention is based on a main control section;

a first discharging part for discharging the battery from the discharge starting voltage to the discharged voltage under the control of the main control part;

a second discharging unit for discharging the battery from the discharged voltage to the reverse potential voltage under the control of the main control unit;

there is provided a battery discharging apparatus including a short-circuit switch that short-circuits the battery according to control of the main control section when the voltage of the battery is increased from the reverse potential voltage to 0V.

In addition, the first discharging part may include an opening and closing control part connected to the battery; and a load resistor unit connected between the opening/closing control unit and the battery and providing different resistance values.

The opening/closing control unit may include at least one insulated gate positive polarity transistor (insulated gate bipolar transistor: IGBT).

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

In addition, the second discharging part may include a phase control part connected to the battery; a transformer connected to the 2-time side of the phase control section; a switchboard connected to the secondary side of said transformer 1.

In addition, the phase control section 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 configuration.

In another aspect, there is provided a battery discharging method according to the present invention, including the steps of discharging a battery from a discharge start voltage to a discharged voltage through a first discharging part; a step of discharging the voltage from the discharged voltage to an inverse potential voltage by a second discharging unit; and a step of shorting the battery when the voltage of the battery is increased from the reverse potential voltage to 0V by a shorting switch.

In another aspect, according to the present invention, there is provided the step of discharging the battery through the first discharging part, comprising: a step of turning ON (ON) the opening/closing control unit of the first discharge unit and turning OFF (OFF) the phase control unit of the second discharge unit; a step of providing different resistance values by a load resistor part of the first discharging part; the step of discharging the battery through the second discharging part includes; a step of turning OFF (OFF) the switching control unit of the first discharge unit and turning ON (ON) the phase control unit of the second discharge unit; and a step of turning OFF (OFF) the phase control unit of the second discharging unit when the battery is displayed as the reverse potential voltage.

In addition, the battery discharging method further includes, between the step of discharging the battery through the first discharging portion and the step of discharging the battery through the second discharging portion: a step of operating the first and second discharge units simultaneously; and stopping the first discharge unit.

ADVANTAGEOUS EFFECTS OF INVENTION

In the present invention, the battery is discharged to the discharge completion voltage by the first discharging unit, and the battery is discharged to the negative polarity reverse bit voltage which is lower than the discharge completion voltage by the second discharging unit, thereby improving stability, reducing discharging time and discharging cost, and improving convenience.

In particular, by the reverse potential discharge which cannot be realized by the existing discharge device, the battery can be perfectly discharged at 0V, and compared with the existing discharge mode of precipitating the battery in brine for reuse, the method has remarkable time and economic effects, and can perfectly solve the problem of treatment by utilizing the brine.

In addition, when the battery is disassembled for repair or replacement of the electric vehicle, discharging of the battery must be performed, at which time the battery can be discharged to a desired voltage with a certain current desired by a user, thereby checking the performance of the battery.

In order to determine whether or not the battery is reused, discharge may be performed, and if the necessary performance is not achieved, discharge which is immediately discarded may be additionally performed.

This applies not only to batteries for electric vehicles but also to batteries for energy storage devices and the like.

Drawings

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

Fig. 2 is a circuit diagram showing a battery discharging apparatus according to a first embodiment of the present invention.

Fig. 3 to 5 are diagrams for explaining the operation of the battery discharging apparatus according to the first embodiment of the present invention.

Fig. 6 is a flowchart for explaining a discharging method of the battery discharging apparatus according to the first embodiment of the present invention.

Fig. 7 is a flowchart for explaining a discharging method of a battery discharging apparatus according to a second embodiment of the present invention.

Detailed Description

The present invention will be described below with reference to the drawings.

As shown in fig. 1, a battery discharging apparatus (110) according to a first embodiment of the present invention includes a main control section (120), an opening/closing control section (130), a load resistor section (132), a phase control section (140), a transformer (142), a distribution board (144), a change-over switch (150), a current detection section (152), a voltage detection section (154), a short-circuit switch (156), wherein the opening/closing control section (130) and the load resistor section (132) constitute a first discharging section, the phase control section (140), the transformer (142), and the distribution board (144) constitute a second discharging section.

Specifically, the main control section (120) receives the voltage and current of the battery (170) detected by the voltage detection section (154) and the current detection section (152), and controls the opening/closing control section (130) and the phase control section (140) according to the voltage and current of the battery (170) connected to the opening/closing control section (130) and the phase control section (140).

For example, the main control unit (120) starts the switching control unit (130) when the detected voltage of the battery (170) is within a range between the discharge start voltage and the discharge end voltage, the phase control unit (140) controls the stop of the operation, and the switching control unit (130) stops the operation and the phase control unit (140) can control the operation when the detected voltage of the battery (170) is within a range between the discharge end voltage and the negative polarity reverse bit voltage.

Here, the discharged voltage is smaller than the discharge end voltage, and the discharge end voltage may be a voltage corresponding to a state of 0% of the charging rate.

The opening/closing control unit (130) is connected between the load resistor unit (132) and the current detection unit (152) to control the connection between the load resistor unit (132) and the current detection unit (152) under the control of the main control unit (120).

For example, when the detected voltage of the battery (170) is within a range between the discharge start voltage and the discharge end voltage, the opening/closing control section (130) may control the connection of the load resistance section (132) and the current detection section (152).

Such an opening/closing control section (130) may include a large-capacity opening/closing element such as an insulated gate positive polarity transistor (insulated gate bipolar transistor: IGBT).

A load resistor unit (132) is connected between the switching control unit (130) and the changeover switch (150) to adjust the resistance value of the load resistor in accordance with the control of the main control unit (120) so that the battery (170) is discharged in an optimal state.

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

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

For example, the phase control section (140) may control that when the detected voltage of the battery (170) is smaller than the range between the discharge completion voltage of the discharge end voltage and the reverse bit voltage of the negative polarity, the positive terminal (+) of the battery (170) and the current detection section (152) are connected.

The discharged voltage and the reverse bit voltage may be the same and have opposite polarities, and the discharge start voltage is about 500V, the discharge end voltage is about 250V, the discharged voltage is about 10V, and the reverse bit voltage is about-10V.

Such a phase control section (140) may include an opening and closing element such as a silicon-controlled rectifier (SCR-controlled rectifier).

A transformer (142) and a distribution board (grid) (144) are connected in turn to the phase control section (140) to supply power to the phase control section (140).

The changeover switch (150) is connected between the load resistance section (132) and the positive terminal (+) of the battery (170), and controls the connection of the load resistance section (132) and the positive terminal (+) of the battery (170) in accordance with the control of the main control section (120), thereby switching the operations of the first and second discharging sections.

For example, when the detected voltage of the battery (170) is within a range between a discharge start voltage and a discharge end voltage, the switch (150) connects the switching control unit (130) and the load resistor unit (132) to the battery (170) to discharge the battery (170) through the first discharge unit, or when the detected voltage of the battery (170) is within a range between the discharge end voltage and a negative polarity reverse voltage, the switching control unit (130) and the load resistor unit (132) are separated from the battery (170) by the battery (170) according to the control of the main control unit (120), and the battery (170) is additionally discharged by the second discharge unit.

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

A short-circuit switch (156) is connected between the positive terminal (+) and the negative terminal (-) of the battery (170), and controls the connection of the positive terminal (+) and the negative terminal (-) of the battery (170) according to the control of the main control unit (120).

For example, in the short-circuit switch (156), the detected voltage of the battery (170) decreases from the discharge start voltage to the reverse-conversion voltage by the discharge-completed voltage, and then increases again until reaching 0V, the positive terminal (+) and the negative terminal (-) of the battery (170) are disconnected (open), and when the detected voltage of the battery (170) increases from the reverse-conversion voltage to 0V, the positive terminal (+) and the negative terminal (-) of the battery (170) may be short-circuited (short).

As described above, in the battery discharging apparatus (110) according to the first embodiment of the present invention, the battery (170) is discharged from the discharge start voltage to the discharge end voltage through the discharge end voltage by the first discharging part of the opening and closing control part (130) and the load resistance part (132), the battery (170) is additionally discharged from the discharge end voltage to the reverse bit voltage through the second discharging part of the phase control part (140), the transformer (142) and the distribution board (144), and when the voltage of the battery (170) becomes 0V through the short-circuit switch (156), the positive terminal (+) and the negative terminal (-) of the battery (170) are short-circuited.

Therefore, the stability of the battery (170) is improved, the discharge time and the discharge cost of the battery (170) are reduced, and the convenience of the discharge process of the battery (170) is improved.

Exemplary circuitry for such a battery discharge device (110) is described with reference to the accompanying drawings.

Fig. 2 is a circuit diagram showing a battery discharging apparatus according to a first embodiment of the present invention, and the description of the same parts as fig. 1 is omitted.

As shown in fig. 2, the battery discharging apparatus (110) according to the first embodiment of the present invention includes an opening/closing control section (130), a load resistance section (132), a phase control section (140), a transformer (142), a distribution board (144), a change-over switch (150), a current detection section (152), a short-circuit switch (156), a reactor (160), a diode (162), a main relay (164), a fuse (166), and the like.

The opening/closing control unit (130) controls the connection between the load resistor unit (132) and the battery (170) 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).

For example, the opening/closing control section (130) may include a plurality of insulated gate positive polarity transistors (insulated gate bipolar transistor: IGBTs) connected in parallel with each other.

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

For example, the load resistance part (132) may include first to fifth resistances (R1 to R5) connected in series or parallel and having different resistance values, and fourth switches (s 1 to s 4) connected to both ends of the first to fifth resistances (R1 to R5).

The first to fourth resistors (R1 to R4) and the three fifth resistors (R5) are sequentially connected in series to the changeover switch (150), and the first to third switches (s 1 to s 3) are connected to both ends of the second to fourth resistors (R2 to R4), respectively, and the fourth switch (s 4) may be connected to both ends of the three fifth resistors (R5).

The load resistance section (132) can realize various resistance values by turning ON/OFF (ON/OFF) the first to fourth switches (s 1 to s 4) in accordance with the control of the main control section (120).

For example, the load resistance section (132) has a resistance value of "r1+r3+3r5" when the first to fourth switches (s 1 to s 4) are turned ON (ON), OFF (OFF), ON (ON), and OFF (OFF), respectively, and the load resistance unit (132) may have a resistance value of "r1+r4" when the first to fourth switches (s 1 to s 4) are turned ON (ON), OFF (OFF), and ON (ON), respectively

The opening/closing control unit (130) and the load resistor unit (132) can be configured with a first discharge unit.

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

For example, the phase control unit (140) may include four silicon-controlled rectifiers (SCR) connected in a bridge (bridge) configuration.

The transformer (142) is connected to the 2-time side of the bridged input terminal, and the switchboard (144) is connectable 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) can reduce the discharged voltage of the battery (170) to a reverse conversion voltage by using the transformer (142) and the distribution board (144).

For example, the transformer (142) outputs alternating voltages of positive and negative polarities according to an input voltage of the switchboard (144) and transmits the alternating voltages to an input terminal of a bridge of the phase control section (140).

Then, after the phase control unit (140) is turned ON by the control of the main control unit (120), when the voltage of the positive terminal (+) of the battery (170) is greater than the voltage of the secondary side of the transformer (142), the ON state connecting the positive terminal (+) and the negative terminal (-) of the battery (170) is maintained, and when the voltage of the positive terminal (+) of the battery (170) is equal to or less than the voltage of the secondary side of the transformer (142), the voltage of the positive terminal (+) of the battery (170) is reduced, and when the voltage of the positive terminal (+) of the battery (170) is equal to or less than the voltage of the secondary side of the transformer (142), the positive terminal (+) and the negative terminal (-) of the battery (170) are turned OFF, so that the reduction of the voltage of the positive terminal (+) of the battery (170) can be stopped.

The change-over switch (150) is turned ON (ON) according to the control of the main control unit (120), and discharges the battery (170) from a first discharge unit including an ON-OFF control unit (130) and a load resistor unit (132), and is turned OFF (OFF) according to the control of the main control unit (120), and discharges the battery (170) from a second discharge unit including a phase control unit (140), a transformer (142), and a distribution board (144).

The reactor (160) can remove harmonic components of the current and voltage of the battery (170), and the diode (162) can block the reverse voltage of the battery (170).

The main relay (164) serves to start or stop the battery discharging device (110), and the fuse (166) serves to block abnormal voltage and current from flowing.

The battery discharging device (110) discharges a battery (170) from a discharge start voltage to a discharge end voltage through a discharge end voltage, discharges the battery (170) from the discharge end voltage to a reverse bit voltage through a first discharging part, and additionally discharges the battery (170) through a 2 nd discharging part, wherein when the voltage is increased from the reverse bit voltage to 0V, the battery (170) can be short-circuited through a short-circuit switch (156), which will be described with reference to the accompanying drawings.

Fig. 3 to 5 are diagrams for explaining the operation of the battery discharging apparatus according to the first embodiment of the present invention, and the explanation of the same parts as those of fig. 1 and 2 is omitted.

As shown in fig. 3, if the battery discharging device (110) according to the first embodiment of the present invention is started, the ON/OFF control section (130), the transfer switch (150) and the main relay (164) are turned ON (ON), the phase control section (140) and the short-circuit switch (156) are turned OFF (OFF), respectively, the battery (170) is discharged by the first discharging section of the ON/OFF control section (130) and the load resistor section (132), and the voltage of the battery (170) is gradually reduced from the initial discharge start voltage to the discharge end voltage through the discharge end voltage.

For example, the discharge initiation voltage is about 500V, the discharge termination voltage is about 250V, and the discharged voltage may be about 10V.

At this time, the first to fourth switches (s 1 to s 4) of the load resistance section (132) may have an ON (ON) state or an OFF (OFF) state, respectively.

As shown in fig. 4, 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, the main relay (164) is kept ON, the short-circuit switch (156) is kept OFF, and the battery (170) is discharged through the phase control unit (140), the transformer (142) and the second discharge unit of the distribution board (144), and the voltage of the battery (170) gradually decreases from the discharge completion voltage.

Thereafter, when the voltage of the battery (170) becomes the reverse-bit voltage, the opening/closing control unit (130), the changeover switch (150), and the short-circuit switch (156) are kept in an OFF state, the phase control unit (140) is kept in an OFF state, the main relay (164) is kept in an ON state, and the voltage of the battery (170) is gradually increased from the reverse-bit voltage to 0V

For example, the reverse bit voltage may be the same as the discharged voltage, or may be about-10V.

As shown in fig. 5, when the voltage of the battery (170) becomes 0V, the opening/closing control unit (130), the transfer switch (150), and the phase control unit (140) are kept in an OFF state, the main relay (164) is kept in an ON state, the short-circuit switch (156) is turned ON, and the positive terminal (+) and the negative terminal (-) of the battery (170) are short-circuited (short).

After the positive electrode terminal (+) and the negative electrode terminal (-) of the battery (170) are shorted by the shorting switch (156), the battery (170) is separated (de-attached) from the battery discharging device (110), and a separate shorting portion (not shown) for shorting the positive electrode terminal (+) and the negative electrode terminal (-) of the battery (170) is attached to the battery (170), so that 0V of the battery (170) being conveyed can be maintained.

A discharging method of a battery discharging apparatus (110) according to a first embodiment of the present invention is described with reference to the accompanying drawings.

Fig. 6 is a flowchart for explaining a discharging method of a battery discharging apparatus according to a first embodiment of the present invention, and is explained with reference to fig. 1 to 5.

As shown in fig. 6, the battery discharging apparatus (110) according to the first embodiment of the present invention starts a discharging action (st 10).

First, a discharge voltage and a discharge current are set (st 12), and a discharge operation (st 14) of a first discharge unit of an opening/closing control unit (130) and a load resistor unit (132) is started.

Then, it is determined whether or not the current battery (170) voltage is greater than the discharged voltage (st 16).

As a result of the determination, when the current battery (170) voltage is higher than the discharge completion voltage (YES), it is determined whether the 1 st discharge unit discharge current is lower than the set discharge current (st 18).

As a result of the determination, when the discharge current of the first discharge portion is smaller than the set discharge current (yes), the current control duty ratio of the first discharge portion is increased (st 20), the discharge current of the first discharge portion is increased, and then the discharge operation start phase of the first discharge portion is returned (st 14).

As a result of the determination, when the first discharge portion discharge current is not smaller than the set discharge current (no), it is determined whether or not the first discharge cell discharge current is larger than the set discharge current.

As a result of the determination, when the discharge current of the first discharge unit is larger than the set discharge current (yes), the current control duty ratio of the first discharge unit is reduced (st 24), the discharge current of the first discharge unit is reduced, and then the discharge operation start phase of the first discharge unit is returned (st 14).

On the other hand, it is determined whether the current battery (170) voltage is greater than the discharged voltage (st 16), whether the current battery (170) voltage is greater than the discharged voltage (no), and whether the current battery (170) voltage is the same as the discharged voltage (st 26).

As a result of the determination, if the current battery (170) voltage is the same as the discharged voltage (YES), the discharging operation of the 1 st discharging unit is stopped (st 28).

Then, a discharge operation (st 30) of the second discharge unit of the phase control unit (140), the transformer (142), and the distribution board (144) is started.

Then, it is determined whether or not the current battery (170) voltage is greater than the reverse bit voltage (st 32).

As a result of the determination, when the voltage of the front battery (170) is higher than the inversion bit voltage (YES), it is determined whether the second discharge unit discharge current is lower than the set discharge current (st 34).

As a result of the determination, when the discharge current of the second discharge portion is smaller than the set discharge current (yes), the discharge current of the second discharge portion is increased by increasing the current control duty ratio of the second discharge portion (st 36), and then the discharge operation start phase of the second discharge portion is returned (st 30).

As a result of the determination, when the second discharge portion discharge current is smaller than the set discharge current (no), it is determined whether the second discharge portion discharge current is larger than the set discharge current (st 38).

As a result of the determination, when the discharge current of the second discharge unit is larger than the set discharge current (yes), the current control duty ratio of the second discharge unit is reduced (st 40), the discharge current of the second discharge unit is reduced, and then the discharge operation start phase of the second discharge unit is returned (st 30).

On the other hand, if the current battery (170) voltage is not greater than the reverse potential voltage (no), it is determined whether the current battery (170) voltage is the same as the reverse potential voltage (st 42), as a result of determining whether the current battery (170) voltage is greater than the reverse potential voltage (st 32).

The judgment result shows that if the current battery (170) voltage is the same as the reverse voltage (yes), the discharging operation of the 2 nd discharging unit is stopped (st 44).

As described above, in the battery discharging device (110) according to the first embodiment of the present invention, the battery (170) is discharged from the discharge start voltage to the discharge end voltage through the opening/closing control section (130) and the first discharging section of the load resistance section (132), the battery (170) is discharged from the discharge end voltage to the reverse potential voltage, the phase control section (140), the transformer (142) and the second discharging section of the distribution board (144), and when the voltage is increased from the reverse potential voltage to 0V, the battery (170) can be short-circuited by the short-circuit switch (156).

Therefore, all charges charged in the battery (170) can be safely removed by the first and second discharging parts, and the battery (170) can be completely discharged to 0V.

In addition, the convenience of use can be improved by the short-circuit switch (156).

However, in the battery discharging apparatus (110) according to the first embodiment of the present invention, after the discharge operation from the first discharging portion to the discharged voltage is completed, the first discharging portion is stopped (st 28) before the discharge of the second discharging portion is started, and at this time, as the load is separated from the battery (170), the voltage of the battery (170) increases by a certain amount from the discharged voltage, and may become a recovery voltage.

When the recovery voltage of the battery (170) is greater than the voltage of the secondary side of the transformer (142) of the second discharging unit, the discharging operation of the second discharging unit cannot be started.

In order to improve this, although the recovery voltage of the battery (170) of the second discharge unit can be accommodated by increasing the overlapping range of the discharged voltage of the first discharge unit and the 2-time side voltage of the transformer (142) of the second discharge unit, it is difficult to predict the recovery voltage based on the 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 larger the capacity of the transformer (142) of the second discharge unit and the higher the manufacturing cost.

In other embodiments, when switching from the operation of the first discharge portion to the operation of the second discharge portion, the first and second discharge portions may be operated simultaneously without stopping the discharge operation, and the description will be made with reference to the accompanying drawings.

Fig. 7 is a flowchart illustrating a discharging method of a battery discharging apparatus according to a second embodiment of the present invention, and the constitution of the battery discharging apparatus is the same as the first embodiment, so that the description is made with reference to fig. 1 to 5 at the same time.

As shown in fig. 7, the battery discharging apparatus (110) according to the second embodiment of the present invention starts a discharging action (st 110).

First, a discharge voltage and a discharge current are set (st 112), and a discharge operation of a first discharge unit of an opening/closing control unit (130) and a load resistor unit (132) is started (st 114).

Then, it is determined whether or not the current battery (170) voltage is greater than the discharge completion voltage (st 116).

As a result of the determination, when the current battery (170) voltage is greater than the discharge completion voltage (YES), it is determined whether the first discharge unit discharge current is smaller than the set discharge current (st 118).

As a result of the determination, when the discharge current of the first discharge portion is smaller than the set discharge current (yes), the current control duty ratio of the first discharge portion is increased (st 120), the discharge current of the first discharge portion is increased, and then the discharge operation start phase of the first discharge portion is returned (st 114).

As a result of the determination, when the first discharge portion discharge current is not smaller than the set discharge current (no), it is determined that the first discharge portion discharge current is larger than the set discharge current (st 122).

As a result of the determination, when the discharge current of the first discharge unit is larger than the set discharge current (yes), the current control duty ratio of the first discharge unit is reduced (st 124), the discharge current of the first discharge unit is reduced, and then the discharge operation start phase of the first discharge unit is returned (st 114).

On the other hand, it is determined whether the current battery (170) voltage is greater than the discharged voltage (st 116), whether the current battery (170) voltage is greater than the discharged voltage (no), and whether the current battery (170) voltage is the same as the discharged voltage (st 126).

The judgment result shows that the current battery (170) voltage is the same as the discharged voltage (yes), and the discharge operation transition between the 1 st and 2 nd discharge units is started (st 128).

Then, it is determined whether or not the discharge current of the first discharge portion is greater than 0 (st 130).

As a result of the determination, when the discharge current of the first discharge portion is larger than 0 (yes), the discharge current of the first discharge portion is reduced by reducing the current control duty ratio (st 132) of the first discharge portion.

Then, it is determined whether the discharge current of the second discharge portion is smaller than the set discharge current (st 134)

The determination result shows that the second discharge portion discharge current is smaller than the set discharge current (yes), and the second discharge portion discharge current is increased by increasing the second discharge portion current control duty ratio (st 136).

On the other hand, as a result of judging whether the discharge current of the first discharge section is greater than 0 (st 130), when the discharge current of the first discharge section is not greater than 0 (no), the discharge operation of the first discharge section is stopped (st 138).

Then, it is determined whether or not the current battery (170) voltage is greater than the reverse bit voltage (st 140).

As a result of the determination, when the current battery (170) voltage is higher than the inversion bit voltage (YES), it is determined whether the second discharge unit discharge current is lower than the set discharge current (st 142).

As a result of the determination, when the discharge current of the second discharge portion is smaller than the set discharge current (yes), the discharge current of the second discharge portion is increased by increasing the current control duty ratio of the second discharge portion (st 144), and then the discharge operation stop phase of the first discharge portion is returned (st 138).

As a result of the determination, when the second discharge portion discharge current is not smaller than the set discharge current (no), it is determined whether the second discharge portion discharge current is larger than the set discharge current (st 146).

As a result of the determination, when the discharge current of the second discharge unit is larger than the set discharge current (yes), the current control duty ratio of the second discharge unit is reduced (st 148), the discharge current of the second discharge unit is reduced, and then the discharge operation stop stage of the first discharge unit is returned (st 138).

On the other hand, if the current battery (170) voltage is not greater than the reverse bit voltage (no), it is determined (st 140) whether the current battery (170) voltage is the same as the reverse bit voltage if the current battery (170) voltage is not greater than the reverse bit voltage (no).

The judgment result shows that when the current battery (170) voltage and the reverse bit voltage are the same (yes), the discharging operation of the 2 nd discharging unit is stopped (st 152).

As described above, in the battery discharging device (110) according to the second embodiment of the present invention, the battery (170) is discharged through the first discharging part of the opening and closing control part (130) and the load resistance part (132), from the discharge start voltage to the discharge end voltage through the discharge end voltage, and the battery (170) is further discharged through the discharge end voltage to the reverse bit voltage phase control part (140), the transformer (142), and the second discharging part of the distribution board (144), and when the voltage is increased from the reverse bit voltage to 0V, the battery (170) can be short-circuited through the short-circuit switch (156).

In addition, when the discharging operation of the first discharging portion is completed, the first discharging portion and the second discharging portion operate together instead of stopping the first discharging portion, and the discharging operation of the first discharging portion is stopped after the discharging operation of the second discharging portion is started, so that the discharging operation between the first and second discharging portions can be smoothly switched and the manufacturing cost can be reduced.

While the present invention has been described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the technical spirit and scope of the present invention as set forth in the following claims.

Claims

1. A battery discharging apparatus, comprising:

a main control part;

a first discharging unit that discharges the battery from a discharge start voltage to a discharge end voltage under control of the main control unit;

a second discharging unit that discharges the voltage from the discharged voltage to a reverse potential voltage under control of the main control unit;

and a short-circuit switch for short-circuiting the battery under control of the main control unit when the voltage of the battery increases from the reverse potential voltage to 0V.

2. The battery discharge apparatus as claimed in claim 1, wherein,

the first discharge section includes:

an opening/closing control unit connected to the battery;

and a load resistor unit which is connected between the opening/closing control unit and the battery and provides different resistance values.

3. The battery discharge apparatus as claimed in claim 2, wherein,

the opening/closing control section includes at least one insulated gate bipolar transistor (insulated gate bipolar transistor: IGBT).

4. The battery discharge apparatus as claimed in claim 2, wherein,

the load resistor section 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.

5. The battery discharge apparatus as claimed in claim 1, wherein,

the second discharge section includes:

the phase control part is connected to the battery;

the transformer connected to the 2-time side of the phase control part;

the switchboard is connected to the secondary side of the transformer 1.

6. The battery discharging apparatus according to claim 5, wherein,

the phase control section includes at least one Silicon Controlled Rectifier (SCR) of silicon-controlled rectifier.

7. The battery discharge apparatus as claimed in claim 6, wherein,

the at least one silicon controlled rectifier includes four silicon controlled rectifiers connected to each other in a bridge configuration.

8. A battery discharging method, comprising:

a step of discharging the battery from the discharge start voltage to the discharged voltage by the first discharging part;

a step of discharging the voltage from the discharged voltage to an inverse potential voltage by a second discharging unit;

and a step of shorting the battery when the voltage of the battery is increased from the reverse potential voltage to 0V by a shorting switch.

9. The method for discharging a battery according to claim 8, wherein,

the step of discharging the battery through the first discharging part includes:

a step of turning ON (ON) the opening/closing control unit of the first discharge unit and turning OFF (OFF) the phase control unit of the second discharge unit;

a step of providing different resistance values by the load resistor part of the first discharging part,

the step of discharging the battery through the second discharging part includes:

a step of turning OFF (OFF) the opening/closing control unit of the first discharge unit and turning ON (ON) the phase control unit of the second discharge unit;

and a step of turning OFF (OFF) the phase control unit of the second discharging unit when the battery is displayed as the reverse potential voltage.

10. The method for discharging a battery according to claim 8, wherein,

the step of discharging the battery through the first discharging part and the step of discharging the battery through the second discharging part further include:

a step of operating the first and second discharge units simultaneously; and

and a step of turning off the first discharge unit.