KR102431726B1 - Apparatus for discharging battery - Google Patents

Abstract

A device for discharging a battery of the present embodiment comprises: a first heat dissipation resistance unit, a second heat dissipation resistance unit, and a third heat dissipation resistance unit; a first magnetic contactor; a second magnetic contactor; a fourth heat dissipation resistance unit; and a third magnetic contactor. For resistance discharge of the battery, which is to be discharged, the first heat dissipation resistance unit, the second heat dissipation resistance unit, and the third heat dissipation resistance unit are connected in series to each other, and are connected in parallel with the battery. As a magnetic contactor switched on at a first voltage, one end of the first magnetic contactor is connected to the battery, and the other end of the first magnetic contactor is connected between the first heat dissipation resistance unit and the second heat dissipation resistance unit. As a magnetic contactor switched on at a second voltage which is lower than the first voltage, one end of the second magnetic contactor is connected to the battery, and the other end of the second magnetic contactor is connected between the second heat dissipation resistance unit and the third heat dissipation resistance unit. The fourth heat dissipation resistance unit is connected in parallel with the battery, and includes at least one resistor. As a magnetic contactor switched on at a third voltage which is lower than the second voltage, one end of the third magnetic contactor is connected to the fourth heat dissipation resistance unit and the other end of the third magnetic contactor is connected to the battery. The present invention can completely discharge a high voltage battery.

Description

Battery discharging device {Apparatus for discharging battery}

The present invention relates to a battery discharging device, and more particularly, to a device capable of rapidly discharging a high voltage through resistance discharging.

Secondary batteries that are easy to apply according to product groups and have electrical characteristics such as high energy density are not only various electronic devices, but also electric vehicles (EVs) or hybrid vehicles (HEVs) driven by electric driving sources. ) are commonly used. The secondary battery is attracting attention as a new energy source for improving eco-friendliness and energy efficiency in that not only the primary advantage of reducing the use of fossil fuels but also the fact that no by-products are generated according to the use of energy.

As a device for testing the charge/discharge efficiency of such a secondary battery, a battery testing device is used. The battery inspection device includes a discharger connected in series with the battery (secondary battery), and inspects the discharge characteristics appearing while discharging the battery. In order for the battery inspection apparatus to record and inspect the discharge characteristics, the current discharged from the battery must be several thousand amperes (A) to ten thousand amperes or more.

The types of secondary batteries currently widely used include a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, and the like. The operating voltage of these batteries is about 2V to 3V. A low-voltage battery has difficulties in inspecting discharge characteristics in a battery inspection device. In general, since even the internal resistance in the wire connecting the battery and the discharger becomes several mΩ, it is difficult for the low-voltage battery to satisfy the above-described current value for inspection.

To solve this problem, a battery discharging auxiliary device is additionally connected in series to the battery and the discharger. The battery discharge assistant supplies an additional voltage in the closed circuit created by each component so that the amount of current required for the inspection in the closed circuit can flow.

In the past, several patents have been applied for battery discharging devices. Korean Patent Application Laid-Open No. 10-2014-0044020, published on April 14, 2014 (hereinafter referred to as [Patent Document 1]) discloses a battery discharger having a crane resistor. The [Patent Document 1] discloses a single use of a crane resistance in the range of 0.09 [Ω] to 1.3 [Ω] in 220 [V] for discharging a large-capacity battery of 24 [V] to 48 [V], and have.

The present invention intends to propose a circuit capable of discharging resistance up to 100 volts, and a discharging device capable of completely discharging a lithium ion battery used in a golf car or an electric vehicle.

In the case of using a plurality of discharging devices of the present embodiment, a circuit configuration capable of discharging a lithium ion battery having a higher voltage is proposed.

The battery discharging apparatus of this embodiment includes: a first heat dissipation resistor unit, a second heat dissipation resistor unit, and a third heat dissipation resistor unit connected in series with each other and connected in parallel with the battery in order to resist discharging a battery to be discharged; a magnetic contactor switched on at a first voltage, the first magnetic contactor having one end connected to the battery and the other end connected between the first heat dissipation resistor unit and the second heat dissipation resistor unit; a second magnetic contactor switched on at a second voltage lower than the first voltage, one end connected to the battery and the other end connected between the second heat dissipation resistor unit and the third heat dissipation resistor unit; a fourth heat dissipation resistor connected in parallel with the battery and including at least one resistor; and a third magnetic contactor switched on at a third voltage lower than the second voltage, one end connected to the fourth heat dissipation resistor and the other end connected to the battery.

And, a fifth heat-dissipating resistor that is connected in parallel with respect to the battery and the fourth heat-dissipating resistor and includes at least one resistor, and a magnetic contactor switched on at a fourth voltage lower than the third voltage, A fourth magnetic contactor has one end connected to the fifth heat dissipation resistor and the other end connected to the battery.

and the first heat dissipation resistance unit, the second heat dissipation resistance unit, and the third heat dissipation resistance unit, defined as a first main heat dissipation means including the first magnetic contactor and the second magnetic contactor, and the first main heat dissipation unit It further includes a second main heat dissipating means having the same circuit configuration as the means and connected in parallel to the first main heat dissipating means.

A first voltage that is a switch-on voltage of the first magnetic contactor is 50V, and a second voltage that is a switch-on voltage of the second magnetic contactor is 16V.

In addition, the first heat dissipation resistor unit is composed of three 1Ω resistors in series, the second heat dissipation resistor unit is composed of two 1Ω resistors in series connection, and the third heat dissipation resistance unit is composed of one 1Ω resistor.

According to the proposed embodiment, it is possible to completely discharge the high voltage battery, and in particular, there is an advantage in that a high-speed discharge through resistance discharge is possible.

1 is a diagram showing a circuit configuration of a battery discharging device according to an embodiment of the present invention.
2 is a view showing an example of actually configuring a circuit diagram of a battery discharging device according to an embodiment of the present invention.
3 is a view illustrating a main discharging means constituting the battery discharging device according to the present embodiment.
4 to 6 are views showing a process of discharging through the main discharging means.
7 and 8 are diagrams showing the circuit configuration of the sub-heat dissipating means constituting the battery discharging device according to the embodiment of the present invention.
9 and 10 are graphs showing photographs of actually manufacturing the circuit configuration of the embodiment shown in FIG. 2 and experimental data of discharging the battery.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

There was a case of recycling the battery through the conventional chlorine discharge, but in this case, there is a problem that the turnover rate is very low. There are advantages to increasing it.

1 is a diagram showing a circuit configuration of a battery discharging device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of actually configuring a circuit diagram of a battery discharging device according to an embodiment of the present invention.

First, referring to FIGS. 1 and 2 , the discharging device of the embodiment includes a voltmeter 3 connected in parallel with the discharging target battery 1 to measure the voltage and current of the discharging target battery 1 , and the discharging target battery A first heat dissipation resistor unit 110 , a second heat dissipation resistor unit 120 , and a third heat dissipation resistor including an ammeter 2 connected in series with ( 1 ) and configured to resist discharging the battery 1 to be discharged. It includes a unit 130 and a fourth heat dissipation resistance unit 140 .

In addition, the first to third heat dissipation resistor units 130 are connected in series with each other while being connected in parallel with the battery 1 to be discharged.

In addition, while the fourth heat dissipation resistor unit 140 is connected in parallel with the battery 1 to be discharged, a fifth heat dissipation resistor unit and a sixth heat dissipation resistor unit additionally connected in parallel with the battery may be further configured according to an embodiment. have.

Each of the first to third heat dissipation resistor units 110 , 120 , and 130 includes at least one resistor, and a first magnetic contactor 210 switched on at a first voltage is connected in parallel with the battery, and a first voltage lower than the first voltage is used. A second magnetic contactor 220 switched on at a voltage of 2 is connected in parallel with the battery.

One end of the first magnetic contactor 210 is connected to the battery 1 to be discharged, and the other end is connected between the first heat dissipation resistor unit 110 and the second heat dissipation resistor unit 120 .

In addition, one end of the second magnetic contactor 220 is connected to the battery 1 to be discharged, and the other end is connected between the second heat dissipation resistor unit 120 and the third heat dissipation resistor unit 130 .

A circuit comprising the first to third heat dissipation resistors and the first and second magnetic contactors may be referred to as a main heat dissipation means, and such a main heat dissipation means may be configured as a pair as in the case of the circuit shown in FIG. can That is, the first main heat dissipating means and the second main heat dissipating means may be configured in parallel with the same resistance and magnetic contactor.

A detailed heat dissipation process, that is, each position of a resistor through which a current is passed, will be described in more detail along with the accompanying drawings.

And, it further includes a third magnetic contactor 230 is switched on to a third voltage lower than the second voltage, the third magnetic contactor 230 is connected in parallel with the battery, one end of the fourth heat dissipation resistor It is connected to the unit 140 , and the other end is connected to the negative electrode of the battery 1 to be discharged.

Through the above configuration, during the initial discharging of the battery 1 to be discharged, the first to third magnetic contactors maintain an off state due to the high voltage and thus maintain a short-circuited state, thereby maintaining the first to third magnetic contactors. 3 Resistance discharge is performed by the heat dissipation resistance units 110 , 120 , and 130 .

Then, after the battery 1 to be discharged is gradually discharged, and the voltage is lowered to the switch-on voltage of the first magnetic contactor 210 , the battery 1 to be discharged due to the switch-on of the first magnetic contactor 210 . ) bypasses the first heat dissipation resistor 110 , so that resistance discharge is mainly performed by the second and third heat dissipation resistors 120 and 130 .

Then, after the battery 1 to be discharged is further discharged and the voltage is lowered to the switch-on voltage of the second magnetic contactor 220 , the battery 1 to be discharged due to the switch-on of the second magnetic contactor 220 . ) bypasses the first and second heat dissipation resistors 110 and 120 so that resistance discharge by the third heat dissipation resistor 130 is mainly performed.

Then, after the battery 1 to be discharged is further discharged and the voltage is lowered to the switch-on voltage of the third magnetic contactor 230 , the battery 1 to be discharged due to the switch-on of the third magnetic contactor 230 . ) is configured such that resistance discharge is mainly performed by the fourth heat dissipation resistance unit 140 .

As described above, when there is a fourth magnetic contactor and a fifth heat dissipation resistor that are additionally configured while being connected in parallel to the third magnetic contactor 230 and the fourth heat dissipation resistor unit 140, the battery to be discharged (1) It may be configured to perform additional resistive discharge when the residual voltage of is further lowered.

Using the circuit diagram of the embodiment shown in FIG. 2 , the resistance discharging process of the battery will be described in more detail.

3 is a view illustrating a main discharging means constituting the battery discharging device according to the present embodiment, and FIGS. 4 to 6 are views showing a discharging process through the main discharging means.

In the circuit diagram of the embodiment, the first magnetic contactors 210 and MC1 have an operating voltage of 50V, and the second magnetic contactors 220 and MC2 have an operating voltage of 16V. And, it is a case in which two main heat dissipating means including the first to third heat dissipating resistors and the first and second magnetic contactors are configured, and these main heat dissipating means are connected in parallel. The switch-on voltage of each magnetic contactor takes into account each of the configured resistance values, and when the resistance value of the second heat dissipation resistor unit 120 is 2Ω and the resistance value of the third heat dissipation resistance unit 130 is 1Ω In this case, it is preferable that the on voltage of the first magnetic contactor be 50V.

And, the first heat dissipation resistance unit 110 is composed of a maximum capacity of 300W, 1Ω (Ohm) resistance 3 in series, the second heat dissipation resistance unit 120 is composed of 300W, 1Ω resistance 2 in series, 3 The heat dissipation resistor 130 is composed of one 300W, 1Ω resistor. The resistance values of the first heat dissipation resistance unit 110 to the third heat dissipation resistance unit 130 are different from each other. That is, the resistance value of the second heat dissipation resistor is configured to be smaller than the resistance value of the first heat dissipation resistor section, and the resistance value of the third heat dissipation resistor is configured to be smaller than the resistance value of the second heat dissipation resistor section, which means that each magnetic contactor is This is to increase the discharge rate by allowing more current to flow through the heat dissipating resistor having a small resistance value when sequentially turned on.

When the battery discharge process is described using the illustrated circuit configuration, when the battery 1 to be discharged is first connected, the voltage of the battery 1 is higher than the switch-on voltage of the first magnetic contactor 210 (MC1). 4, since current flows to the first heat dissipation resistor unit 110 to the third heat dissipation resistor unit 130, discharge is made by these resistors.

And, when the battery voltage drops to 50V, the first magnetic contactors 210 (MC1) are switched on, and the current of the battery bypasses the first heat dissipation resistor unit to connect the first magnetic contactors 210 (MC1). Resistance discharge is made by the second and third heat dissipation resistance units 120 and 130 via the same. At this time, the current of the battery flows toward the first magnetic contactor 210 (MC1) having a relatively very low resistance value than that of the first heat dissipation resistor unit 110 , and eventually resistance discharge by the second and third heat dissipation resistor units. this is done

Then, when the battery voltage is lowered to 16V, as shown in FIG. 6 , as the second magnetic contactors 220 ( MC2 ) are switched on, the current bypasses the first and second heat dissipation resistors to produce the second magnetic contactor 220 (MC2). 2 It moves along the magnetic contactor 220 (MC2), and resistance discharge is made by the third heat dissipation resistor unit 230 .

Then, when the battery is discharged and the voltage is further lowered, resistance discharge is made through the sub heat dissipation means connected in parallel to the main heat dissipation means, and this will be described in detail.

7 and 8 are diagrams showing the circuit configuration of the sub heat dissipating means constituting the battery discharging device according to the embodiment of the present invention, and as described above, the third In this embodiment, the magnetic contactors 230 (MC3) are configured, and the fourth magnetic contactors MC4 having a lower turn-on voltage than the third magnetic contactors 230 (MC3) are configured. The magnetic contactor MC3 and the third heat dissipation resistor are connected in parallel with the battery.

In addition, in the embodiment, two of the fourth magnetic contactors MC4 are connected in parallel, respectively, and the resistance energized when the fourth magnetic contactor MC4 is switched on has a maximum capacity of 50W and a 0.1Ω resistance value. A plurality of resistors are connected in parallel.

When the battery voltage is reduced to 11V, the third magnetic contactor MC3 is switched on, and the battery current is resistance-discharged through the third heat dissipation resistor connected in series with the magnetic contactor MC3 as shown in FIG. 7 . this is done The fourth heat dissipation resistor is formed by connecting two resistors in parallel with a maximum capacity of 300W and a resistance value of 1Ω.

At this time, the fourth heat dissipation resistor has the same resistance as the 1 Ω resistor used in the third heat dissipation resistor, but two of these 1 Ω resistors are connected in parallel to form a resistance portion having a smaller resistance than the resistance value of the third heat dissipation resistor. By connecting, it is 0.5 Ω on the battery side, so that the current remaining in the battery is resistance-discharged by the fourth heat dissipation resistor unit. Of course, it would be possible to use one 0.5Ω resistor.

Then, when the battery voltage is reduced to 1.1V, the fourth magnetic contactor MC4 whose turn-on voltage is set to 1.1V is switched on, and in this case, a resistor connected to the fourth magnetic contactor MC4 (for example, , the fifth heat dissipation resistor) may have a structure in which resistors having a maximum capacity of 50W and a resistance value of 0.1Ω are connected in parallel.

In order to have the fifth heat dissipation resistor unit also have a lower resistance value than the fourth heat dissipation resistor unit (0.5 Ω resistance value due to 1 Ω parallel connection), it is necessary to use a 0.1 Ω resistor, and in the embodiment, to have a very low resistance value. In order to do this, four 0.1Ω resistors are connected in parallel so that the resistance value is 0.025Ω on the battery side so that the final battery discharge occurs at a high speed.

Therefore, the resistance value of the first to fifth heat dissipating resistors configured to allow the resistance discharge of the battery has the largest resistance value of the first heat dissipation resistor, and the resistance value of the first heat dissipation resistor unit needs to be configured such that the resistance value gradually decreases toward the fifth heat dissipation resistor unit. there is

9 and 10 are graphs showing photographs of actually fabricating the circuit configuration of the embodiment shown in FIG. 2 and experimental data of discharging the battery.

As can be seen from the graph of the total battery voltage (CH-5) , it was confirmed that the discharge was performed at a very fast rate, and The description indicates that resistance discharge is made when each of the first magnetic contactors to the fourth magnetic contactors is sequentially turned on.

Claims (5)

a first heat dissipation resistor unit, a second heat dissipation resistor unit, and a third heat dissipation resistor unit connected in series with each other and connected in parallel with the battery to resist discharging the battery to be discharged;
a first magnetic contactor switched on at a first voltage, one end connected to the battery and the other end connected between the first heat dissipation resistor unit and the second heat dissipation resistor unit;
a magnetic contactor switched on at a second voltage lower than the first voltage, a second magnetic contactor having one end connected to the battery and the other end connected between the second heat dissipation resistor unit and the third heat dissipation resistor unit;
a fourth heat dissipation resistor connected in parallel to the battery and including at least one resistor; and
A magnetic contactor switched on at a third voltage lower than the second voltage, wherein one end is connected to the fourth heat dissipation resistor and the other end is a third magnetic contactor connected to the battery;
a fifth heat dissipation resistor connected in parallel with respect to the battery and the fourth heat dissipation resistor and including at least one resistor;
A magnetic contactor switched on at a fourth voltage lower than the third voltage, one end connected to the fifth heat dissipation resistor unit and the other end further comprising a fourth magnetic contactor connected to the battery;
defined as a first main heat dissipation means comprising the first heat dissipation resistance unit, the second heat dissipation resistance unit, and the third heat dissipation resistance unit, and the first magnetic contactor and the second magnetic contactor;
and a second main heat dissipating means configured in the same circuit configuration as the first main heat dissipating means and connected in parallel to the first main heat dissipating means. The method of claim 1,
A first voltage that is a switch-on voltage of the first magnetic contactor is 50V,
A second voltage that is a switch-on voltage of the second magnetic contactor is 16V. 3. The method of claim 2,
The first heat dissipation resistor is composed of a series connection of three 1Ω resistors,
The second heat dissipation resistor is composed of a series connection of two 1Ω resistors,
The third heat dissipation resistor is a battery discharging device comprising one 1Ω resistor.
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