KR20160024254A - Precharge circuit with improved and battery pack including the same - Google Patents

Abstract

Disclosed is a technology to prevent heat generation or overheating which can occur due to a precharge resistance while the generation of a rush current is suppressed like the conventional precharge circuit. According to an embodiment of the present invention, the precharge circuit is placed in a battery pack which has a battery module, where two or more battery stacks are serially connected and which receives power from an external device through a charging and discharging terminal or supplies power to the external device. The precharge circuit of the present invention comprises: a main relay placed on a charging and discharging track formed between the battery module and the charging and discharging terminal of the battery pack; a precharge track for connecting a first node formed on a track placed between the two or more battery stacks and a second node formed between the main relay and the charging and discharging terminal; a precharge relay placed on the precharge track; and, an inductor placed on the precharge track.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precharge circuit having improved performance and a battery pack having the precharge circuit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precharge circuit, and more particularly, to a precharge circuit and a battery pack having the precharge circuit.

2. Description of the Related Art In recent years, demand for portable electronic products such as notebook computers, video cameras, and portable telephones has been rapidly increased, and electric vehicles, storage batteries for energy storage, robots, and satellites have been developed in earnest. Are being studied actively.

The secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.

In some cases, such a secondary battery is used as a single secondary battery. However, in order to provide a high-voltage and / or large-capacity power storage device, a plurality of secondary batteries are often used in series and / And is used in the form of a battery pack including a battery management device for controlling the charging / discharging operation of the internal secondary battery.

The battery pack management device used in such a battery pack monitors the state of the battery using a temperature sensor, a current sensor, a voltage sensor, and the like, estimates SOC and SOH by using the monitoring result, balances the voltage between battery cells It protects the battery from high voltage, overcurrent, low temperature, high temperature and so on.

Particularly, the battery pack management device may include a protection circuit for preventing an overcurrent from flowing into the battery pack. For example, the battery pack management device has a fuse on the charge / discharge line of the battery pack, and when the overcurrent occurs, the fuse is rubbed to prevent the overcurrent from flowing on the charge / discharge line of the battery pack.

The battery pack management device may include a protection circuit for preventing a rush current, which is an overcurrent that may occur at the initial stage of driving the battery. Here, the rush current is an overcurrent that may instantaneously occur at the initial stage of battery operation. In order to protect the battery pack from such a rush current, a precharge resistor is mainly used.

1 is a view schematically showing a configuration of a battery pack including a precharge resistor and a relay according to the prior art. 1, the battery pack 10 includes a battery module 11, a main relay 12, a precharge relay 13, and a precharge resistor 14, The external device 20 is connected to the terminals pack +, pack-. The main relay 12 is provided on the charge and discharge line 16 of the battery pack 1 and the precharge resistor 14 and the precharge relay 13 are connected to the charge and discharge line 16 in parallel do. At this time, the precharge resistor 14 and the precharge relay 13 are connected in series. The precharge relay 13 and the main relay 12 are switched so as to cross each other to prevent the occurrence of a rush current.

In particular, in the initial stage of driving the battery, the main relay 12 is not turned on from the beginning. That is, when the main relay 12 is turned off, the precharge relay 13 is turned on first. The main relay 12 is turned on only after a predetermined time elapses from when the precharge relay 13 is turned on. Therefore, the initial current flows through the precharge resistor 20 to prevent the occurrence of rush current on the charging / discharging line 16, and an arc is generated when the main relay 12 is turned on .

However, the precharge circuit PC according to the related art includes the precharge resistor 14 as a component. Therefore, when a current flows through the precharge resistor 14, heat is inevitably generated from the precharge resistor 14. Therefore, the precharge resistor 14 and its adjacent components may overheat and deteriorate.

The battery pack 10 having such a precharge circuit PC supplies power to the external device 20 through the charge / discharge terminals pack +, pack-, . In general, the external device 20 is provided with a capacitor 210 called a link capacitor. Otherwise, such a capacitor 210 may be provided in the battery pack 10. Such a capacitor 210 is connected to both ends of the charge / discharge terminals (pack +, pack-) as shown in Fig.

As described above, the precharge relay 13 is turned on before the main relay 12 is turned on for power supply. When the main relay 12 is turned off, the precharge relay 13 is turned on When turned on, the battery pack 10 and the external device 20 form an RC primary closed circuit.

1, the current flowing through the precharge relay 13 to the precharge resistor 14 (hereinafter referred to as a precharge current Ipr) is shown in FIG. 2 The graph becomes like a graph.

FIG. 2 is a graph showing the pre-charge current of FIG. 1 according to a change of time, and FIG. 3 is a graph of voltage of both ends of the charge / discharge terminal of FIG. Here, t1 represents a point in time when the precharge relay 13 is turned on. As shown in FIG. 2, the precharge current Ipr rapidly rises after the precharge relay 13 is turned on, and then gradually decreases. 3, the both-end voltage Vp of the charging / discharging terminals pack +, pack- and the both-end voltage Vp of the link capacitor 210 are gradually increased after the precharge relay 13 is turned on And converges to the both end voltage E of the battery module 11.

However, when the precharge current Ipr rises sharply, components immediately adjacent to the precharge resistor 14 are suddenly overheated, so that a failure occurs in the battery pack 10 or a malfunction occurs in the battery pack 10 There is a concern.

In order to overcome such a problem, it is preferable to increase the resistance (resistance) R of the precharge resistor 14 to reduce the size of the precharge current Ipr which rises rapidly, have. However, another problem arises in that the time constant increases and the time taken for the both ends of the charge / discharge terminals (voltage across the link capacitor, Vp) to converge to the voltage E across the battery module 11 increases. In other words, a time delay may occur in turning on the main relay 12. Therefore, simply increasing the size of the precharge resistor 14 can not be a suitable solution.

Pre-charge resistance protection circuit device using interlock switch (10-2009-0075910, published on July 13, 2009)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to prevent generation of a heat current or an overheating phenomenon that may occur due to precharge resistance while suppressing the occurrence of a rush current.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It is also to be understood that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations thereof.

According to an aspect of the present invention, there is provided a battery pack for receiving power from an external device through a charging / discharging terminal or supplying power to an external device, the battery pack comprising: a battery module having two or more battery stacks connected in series; A charge / discharge line formed between the battery module and a charge / discharge terminal of the battery pack; And a main relay provided on the charge / discharge line, a first node formed on a line provided between the two or more battery stacks, and a second node formed on the line provided between the main relay and the charge / And a precharge circuit including a precharge line, a precharge relay provided on the precharge line, and an inductor provided on the precharge line.

The potential difference between the high potential node and the first node of the battery module may be equal to the potential difference between the first node and the low potential node of the battery module.

The inductor and the precharge relay may be connected in series.

The precharge circuit may further include a diode provided on the precharge line and connected in series with the inductor and the precharge relay.

The precharge circuit may further include a control module for selectively turning on or off the main relay and the precharge relay.

The control module may turn on the precharge relay before turning on the main relay.

The control module may turn on the main relay after the precharge relay is turned on.

초가 경과된 이후 상기 메인 릴레이를 턴 온시킬 수 있다.Wherein the control module controls the pre-charge relay to be turned on,

The main relay can be turned on after a lapse of seconds.

(Where L is the inductance of the inductor and C is the capacitance of the capacitor provided between the charging and discharging terminals of the battery pack)

The control module may turn off the precharge relay after the main relay is turned on.

According to another aspect of the present invention, an automobile includes the above-described battery pack.

According to another aspect of the present invention, there is provided a precharge circuit device including a battery module having two or more battery stacks connected in series, and the precharge circuit device includes a battery module that receives power from an external device through a charge / discharge terminal, A pre-charge circuit provided in a battery pack to be supplied, the pre-charge circuit comprising: a main relay provided on a charge / discharge line formed between charge / discharge terminals of the battery module and the battery pack; A precharge line connecting a first node formed on a line provided between the at least two battery stacks and a second node formed between the main relay and the charge / discharge terminal; A precharge relay provided on the precharge line; And an inductor provided on the precharge line.

The potential difference between the high potential node and the first node of the battery module may be equal to the potential difference between the first node and the low potential node of the battery module.

The inductor and the precharge relay may be connected in series.

The precharge circuit may further include a diode provided on the precharge line and connected in series with the inductor and the precharge relay.

The precharge circuit may further include a control module for selectively turning on or off the main relay and the precharge relay.

The control module may turn on the precharge relay before turning on the main relay.

The control module may turn on the main relay after the precharge relay is turned on.

초가 경과된 이후 상기 메인 릴레이를 턴 온 시킬 수 있다.Wherein the control module controls the pre-charge relay to be turned on,

The main relay can be turned on after a lapse of seconds.

(Where L is the inductance of the inductor and C is the capacitance of the capacitor provided between the charging and discharging terminals of the battery pack)

The control module may turn off the precharge relay after the main relay is turned on.

According to another aspect of the present invention, there is provided a power supply method including: receiving power from an external device through a charge / discharge terminal of a battery pack having a battery module having two or more battery stacks connected in series, A main relay provided on a charge / discharge line formed between the battery module and a charge / discharge terminal of the battery pack, a first node formed on a line provided between the two or more battery stacks, A precharge circuit connected between the charge and discharge terminals and a second node formed on a line provided between the charge and discharge terminals, a precharge relay provided on the precharge line, and an inductor provided on the precharge line, Preparing a battery pack including the battery pack; Turning on the precharge relay; And turning on the main relay.

The precharge circuit according to one aspect of the present invention includes an inductor instead of the precharge resistor, so that it is possible to prevent a heat generation or an overheating phenomenon that may occur due to a resistance component.

According to an aspect of the present invention, the precharge circuit includes an inductor, so that the current does not rise rapidly after the precharge relay is turned on, but gently rises. Therefore, deterioration of the precharge relay can be minimized.

In addition, the present invention can have various other effects, and other effects of the present invention can be understood by the following description, and can be more clearly understood by the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
1 is a view schematically showing a configuration of a battery pack including a precharge resistor and a relay according to the prior art.
Fig. 2 is a graph showing the pre-charge current of Fig. 1 according to the change of time.
Fig. 3 is a graph showing the voltage across the charge / discharge terminal of Fig. 2 as time varies. Fig.
4 is a view illustrating a battery pack according to an embodiment of the present invention.
FIG. 5 is a diagram showing a state in which the precharge relay is turned on in FIG.
6 is a graph showing the pre-charge current of FIG. 5 according to the change of time.
Fig. 7 is a graph showing the voltage across the charge / discharge terminal of Fig. 5 as time varies. Fig.
8 is a flowchart showing a power supply method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

4 is a view illustrating a battery pack according to an embodiment of the present invention.

Referring to FIG. 4, the battery pack 100 includes charge / discharge terminals pack + and pack-, and the external device 200 is connected to the charge / discharge terminals pack + and pack-. The battery pack 100 may receive power from the external device 200 or supply power to the external device 200 through the charge / discharge terminals pack +, pack-.

4 shows an embodiment in which the battery pack 100 supplies electric power to the motor through an inverter provided in the external device 200. [ 4, the external device 200 may be a load supplied with power from the battery pack 100, or alternatively may be a battery pack 100, Device.

In addition, the external device 200 includes a capacitor 210 called a link capacitor. The capacitor 210 is generally provided in the external device 200, but may be provided in the battery pack 100 as a component of the battery pack 100.

4, when the external device 200 is electrically connected to the battery pack 100 through the charge / discharge terminals (pack +, pack-) of the battery pack 100, The voltage Vp at both ends of the charge / discharge terminals pack + and pack- of the battery pack 100 is equal to the voltage across both terminals of the capacitor 210 because the terminals are electrically connected between the terminals of the discharge terminals pack + and pack- Value.

Referring again to FIG. 4, a battery pack 100 according to an embodiment of the present invention includes a battery module 110, a charge / discharge line 160, and a precharge circuit PC.

The battery module 110 may include two or more battery stacks connected in series. Here, the battery stack refers to a single battery cell or a collection of battery cells, and the aggregate of the battery cells may be composed of serial, parallel, or series-parallel battery cells.

The output voltage of the battery pack 100 is equal to the voltage difference between the voltage of the high potential node N3 of the battery module 110 and the voltage of the high- From the voltage difference of the low potential node N4 of the module 110. [

In the embodiment of Figure 4, the battery module 110 is comprised of two battery stacks, a first battery stack 111 and a second battery stack 112, And are connected in series through the provided line. A first node N1 is formed on the line. Further, in each battery stack, the potential difference at both ends is equal to E / 2 [V]. In other words, the potential difference between the high potential node N3 of the battery module 110 and the first node N1 is E / 2 [V] and the potential difference between the first node N1 and the low potential node N1 of the battery module 110 (N4). The potential difference between the high potential node N3 of the battery module 110 and the first node N1 is equal to the difference between the potential difference between the first node N1 and the low potential node N4 of the battery module 110 The same thing is good, and this can be easily understood with reference to the operation of the precharge circuit PC to be described later.

The charge and discharge line 160 may be formed between the battery pack 110 and the charge and discharge terminals pack + and pack- of the battery pack 100. The charging and discharging line 160 provides a path for supplying electric power to the external device 200 from the battery pack 100 or a path for receiving power from the external device 200 do.

The precharge circuit PC includes a main relay 120, a precharge line 170, a precharge relay 130, and an inductor 140.

The main relay 120 is provided on the charge / discharge line 160 and can be selectively turned on or off. Alternatively, the main relay 120 may be turned on or off by receiving a control signal from the control device.

The precharge line 170 may connect the first node N1 and the second node N2. Here, the first node N1 is a node formed on a line provided between the battery stacks. The second node N2 is a node formed on the line between the main relay 120 and the charge / discharge terminals pack +, pack-. This first node N1 and the second node N2 can be more easily understood with reference to the embodiment shown in Fig.

The first node N1 may be configured such that the potential difference between the high potential node N3 and the first node N1 of the battery module 110 is lower than the potential difference between the first node N1 and the low potential of the battery module 110 And the node N4 are equal to each other. This can be easily understood with reference to the operation of the precharge circuit PC, which will be described later.

The precharge relay 130 may be provided on the precharge line 170. The precharge relay 130 is provided on the precharge line 170 and can be selectively turned on or off. Also, the precharge relay 130 may be turned on or off by receiving a control signal from the control device in the same manner as the main relay 120.

The inductor 140 may be provided on the precharge line 170. The inductor 140 is provided on the precharge line 170 to suppress a sudden change in the current flowing through the precharge line 170. The inductor 140 is connected to the external device 200 or the battery pack 100 through a link capacitor 210 connected in parallel to the charge / discharge terminals pack +, pack- of the battery pack 100, It can contribute to forming a resonant circuit.

Here, the inductor 140 does not mean only a wire-wound coil but means an element having an inductance and satisfying the following expression (1). By combining a passive element with an active element or the like It is obvious to a person skilled in the art that it may be implemented.

(1)

V = L di / dt

Here, V is the potential difference across the inductor 140, i is the current flowing through the inductor 140, L is the inductance of the inductor 140, and t is the time.

Meanwhile, the precharge relay 130 and the inductor 140 may be connected in series on the precharge line 170 as shown in FIG.

Preferably, the pre-charge circuit PC may further include a diode 150. Like the precharge relay 130 and the inductor 140, the diode 150 is provided on the precharge line 170 and can be connected in series with the precharge relay 130 and the inductor 140.

The diode 150 is a device that allows the current to flow only in one direction and does not flow in the opposite direction, that is, rectification. The diode 150 is provided on the precharge line 170 and allows current to flow from the first node N1 to the second node N2, It is preferable to install the transistor in a direction in which current can not flow in the direction of one node N1. That is, it is preferable to install it as shown in FIG.

Also, preferably, the pre-charge circuit PC may further include a control module 180. The control module 180 may output a control signal to the main relay 120 and the precharge relay 130, respectively. The control module 180 may control the main relay 120 to selectively turn on or off the main relay 120 by outputting a control signal to the main relay 120. [ In addition, the control module 180 may control the precharge relay 130 to selectively turn on or off the precharge relay 130 by outputting a control signal to the precharge relay 130.

초가 경과된 후, 메인 릴레이(120)를 턴 온시키는 것이 좋은데 이에 대해서는 후술할 프리차지 회로(PC)의 동작을 참조하면 쉽게 이해될 수 있다. 한편, 여기서, L은, 프리차지 선로(170)에 구비된 인덕터(140)의 인덕턴스이고, C는 배터리 팩(100)의 충방전 단자(pack+, pack-) 사이에 구비된 커패시터(210)의 커패시턴스이다. At this time, the control module 180 can control the main relay 120 and the precharge relay 130 in consideration of the function and role of the precharge circuit PC. That is, when the power supply is started, the control module 180 controls the main relay 120 to be turned off and the precharge relay 130 to be turned on so that the main relay 120 is turned on The precharge relay 130 is turned on. Then, when a predetermined time has elapsed, the control module 180 can turn on the main relay 120 in a state in which the precharge relay 130 is turned on. Preferably, the control module 180 determines that the precharge relay 130 is turned on

It is preferable to turn on the main relay 120 after a lapse of seconds, which can be easily understood by referring to the operation of the precharge circuit PC to be described later. L is the inductance of the inductor 140 provided in the precharge line 170 and C is the inductance of the capacitor 210 provided between the charging and discharging terminals pack + Capacitance.

Next, the control module 180 may turn off the precharge relay 130 in a state in which the main relay 120 is turned on.

The control module 180 performs the control operation described above so that the electric current flows through the precharge line 170 at the time of power supply and at the beginning of the charge So that current can flow through the discharge line 160.

Hereinafter, the operation of the precharge circuit PC according to one embodiment of the present invention will be described.

FIG. 5 is a graph showing a state in which the precharge relay is turned on in FIG. 4, FIG. 6 is a graph showing a precharge current in FIG. 5 according to a change in time, And the voltage at both ends is shown according to the change of time.

5 to 7 are views for explaining the operation when the precharge relay 130 is turned on in a state where the main relay 120 is turned off. First, referring to FIG. 5, the main relay 120 is turned off and the precharge relay 130 is turned on. Therefore, the current flows along the direction of the arrow shown in Fig. That is, the precharge current Ipr starts from the second battery stack, flows into the second node N2 through the precharge line 170, and then flows through the high potential charge / discharge terminal pack + 200 through a low-potential charge / discharge terminal (pack-).

초 경과된 시점을 나타내며, t2는, t1으로부터

초 경과된 시점을 나타낸다. That is, when the pre-charge relay 130 is turned on in a state where the main relay 120 is turned off, an LC primary resonance circuit is basically formed. Therefore, the pre-charge current Ipr takes the form as shown in FIG. 5, and the potential difference across the charge / discharge terminals (pack +, pack-) becomes as shown in FIG. In Figs. 6 and 7, t1 indicates a point in time when the precharge relay 130 is turned on, t3 indicates a time from t1

T2 " represents the time from the time t1

Indicates the time point at which the seconds elapsed.

6 and 7, the curve shown by the dotted line after t3 shows the case where the diode 150 does not exist, and the precharge current Ipr and the capacitor 210 voltage Vp are set to the ideal LC resonance Current and voltage in the circuit.

Particularly, paying attention to the voltage Vp of the capacitor 210 shown in FIG. 7, the voltage Vp of the capacitor 210 reaches E [V] at both ends of the battery module 110 at time t3. Therefore, at a time when t3 is approached, the control module 180 may turn on the main relay 120 so that the change of the voltage (the capacitor voltage) between the charge / discharge terminals pack + and pack- is minimized. For example, in the section (a) where the voltage between the charging and discharging terminals (pack +, pack-) is equal to or higher than 95% of the voltage E [V] across the battery module 110, The control unit 120 can be controlled to turn on.

초가 경과된 이후 메인 릴레이(120)를 턴 온시키도록 제어하여, 메인 릴레이(120)의 턴 온으로 인한 서지성 전류의 발생을 방지할 수 있다. 5, when the diode 150 is provided on the precharge line 170, the voltage Vp of the capacitor 210 reaches E [V] at time t3 Next, it does not change as indicated by the dotted line in Fig. That is, the voltage Vp of the capacitor 210 is maintained as shown by the solid line in FIG. 7 without decreasing after t3. Accordingly, the control module 180 can turn on the main relay 120 regardless of the time after t3. That is, since the voltage Vp between the charge / discharge terminals pack + and pack- is equal to the voltage across the battery module 110, at which point the main relay 120 is turned on, The surge current due to the turn-on of the relay 120 is not generated. In other words, the control module 180 determines whether the precharge relay 130 is turned on

The main relay 120 is controlled to be turned on after the elapse of a second time period so that generation of the surge current due to the turn-on of the main relay 120 can be prevented.

On the other hand, when the main relay 120 is turned on, since the second node N2 has a relatively higher potential than the first node N1, no current flows through the precharge line 170. [ That is, when the main relay 120 is turned on, a current flows through the charge / discharge line 160, and full charge and discharge can proceed. The control module 180 preferably turns off the precharge relay 130 after the main relay 120 is turned on to shut off the precharge line 170.

On the other hand, when the potential difference between the high potential node N3 and the first node N1 of the battery module 110 and the potential difference between the first node N1 and the low potential node N4 of the battery module 110 are the same The main relay 120 is turned on to minimize the generation of the surge current. If the potential difference between the high potential node N3 and the first node N1 of the battery module 110 and the potential difference between the first node N1 and the low potential node N4 of the battery module 110 are different , It is difficult to avoid the generation of the surge current due to the turn-on of the main relay 120.

For example, when the potential difference between the high potential node N3 of the battery module 110 and the first node N1 is E * (2/3) [V] and the potential difference between the first node N1 and the battery module 110 ) Of the low potential node N4 is E * (1/3) [V]. In this case, the both-end voltage Vp of the charge / discharge terminals pack + and pack- can reach E * (2/3) [V] which is twice the E * (1/3) The voltage across the module 110, E [V], can not be reached. Therefore, when the main relay 120 is turned on, a surge current is generated due to a potential difference of E * (1/3) [V].

According to another embodiment of the present invention, the above-described battery pack 100 to precharge circuit PC may be included in a vehicle. That is, the automobile according to another embodiment of the present invention may include the battery pack 100 to the precharge circuit (PC). Here, automobiles include electric vehicles and hybrid vehicles as means of transportation using electric energy as a power source.

Hereinafter, a power supply method according to another embodiment of the present invention will be described. As for the power supply method according to another embodiment of the present invention, the description of the battery pack 100 to the precharge circuit (PC) described above can be applied as it is, and repetitive description will be omitted.

A method of supplying power according to another embodiment of the present invention is a method of using a battery pack 100 having a battery module 110 in which two or more battery stacks are connected in series, , pack-), or power is supplied to the external device (200).

8 is a flowchart showing a power supply method according to an embodiment of the present invention.

Referring to FIG. 8, in a power supply method according to an embodiment of the present invention, a battery pack 100 equipped with a precharge circuit (PC) is prepared (S810). The precharge circuit PC included in the prepared battery pack 100 includes a main relay 120, a precharge line 170, a precharge relay 130, and an inductor 140. Here, the main relay 120 may be provided on the charge / discharge line 160 formed between the battery module 110 and the charge / discharge terminals pack + and pack- of the battery pack 100. The precharge line 170 is connected to a first node N1 formed on a line between two or more battery stacks and a line provided between the main relay 120 and the charge / discharge terminals pack +, pack- Lt; RTI ID = 0.0 > N2 < / RTI > Also, the precharge relay 130 and the inductor 140 may be provided on the precharge line 170, respectively.

Preferably, the potential difference between the high potential node N3 of the battery module 110 and the first node N1 is a potential difference between the first node N1 and the low potential node N4 of the battery module 110 Are set to be the same.

The pre-charge relay 130 and the inductor 140 may be connected in series. The pre-charge circuit PC may be provided on the pre-charge line 170, And a diode 150 connected in series with the inductor 140.

When the battery pack 100 equipped with the precharge circuit PC is prepared, the precharge relay 130 is turned on to allow the current to flow through the precharge line 170 (S820).

초가 경과된 이후 메인 릴레이(120)를 턴 온시키는 것이 좋다. Next, the main relay 120 is turned on to allow a current to flow through the charging / discharging line 160 (S830). At this time, the precharge relay 130 is turned on,

It is preferable to turn on the main relay 120 after a lapse of seconds.

Next, the precharge relay 130 is turned off to shut off the precharge line 170 (S840).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

The features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described herein in a single embodiment may be implemented in various embodiments individually or in a suitable subcombination.

100: Battery pack
110: Battery module
111: First battery stack
112: Second battery stack
120: Main relay
130: precharge relay
140: inductor
150: Diode
160: charge / discharge line
170: precharge line
180: Control module
N1: First node
N2: second node
PC: Precharge circuit
200: External device
210: Capacitor
220: Inverter
230: motor

Claims (20)

A battery pack that receives power from an external device through a charging / discharging terminal or supplies power to an external device,
A battery module having two or more battery stacks connected in series;
A charge / discharge line formed between the battery module and a charge / discharge terminal of the battery pack; And
A main relay provided on the charging / discharging line, a first node formed on a line provided between the two or more battery stacks, and a second node formed on a line provided between the main relay and the charge / And a precharge circuit including a precharge line, a precharge relay provided on the precharge line, and an inductor provided on the precharge line.
The method according to claim 1,
Wherein the potential difference between the high potential node and the first node of the battery module is equal to the potential difference between the first node and the low potential node of the battery module.
The method according to claim 1,
Wherein the inductor and the precharge relay are connected in series.
The method of claim 3,
Wherein the precharge circuit further comprises a diode provided on the precharge line and connected in series with the inductor and the precharge relay.
The method according to claim 1,
Wherein the precharge circuit further comprises a control module for selectively turning on or off the main relay and the precharge relay.
6. The method of claim 5,
Wherein the control module turns on the precharge relay before turning on the main relay.
The method according to claim 6,
Wherein the control module turns on the main relay after the precharge relay is turned on.
8. The method of claim 7,
Wherein the control module controls the pre-charge relay to be turned on,

And the main relay is turned on after a lapse of seconds.
(Where L is the inductance of the inductor and C is the capacitance of the capacitor provided between the charging and discharging terminals of the battery pack)
8. The method of claim 7,
Wherein the control module turns off the precharge relay after the main relay is turned on.
A vehicle comprising the battery pack according to any one of claims 1 to 9.
1. A precharge circuit provided in a battery pack having a battery module in which two or more battery stacks are connected in series and is supplied with power from an external device through a charging / discharging terminal or supplies power to an external device,
A main relay provided on the charging / discharging line formed between the battery module and the charging / discharging terminal of the battery pack;
A precharge line connecting a first node formed on a line provided between the at least two battery stacks and a second node formed between the main relay and the charge / discharge terminal;
A precharge relay provided on the precharge line; And
And an inductor provided on the precharge line.
12. The method of claim 11,
Wherein the potential difference between the high potential node and the first node of the battery module is equal to the potential difference between the first node and the low potential node of the battery module.
12. The method of claim 11,
Wherein the inductor and the precharge relay are connected in series.
14. The method of claim 13,
Further comprising a diode provided on the precharge line and connected in series with the inductor and the precharge relay.
12. The method of claim 11,
Further comprising a control module for controlling the main relay and the precharge relay to be selectively turned on or off.
16. The method of claim 15,
Wherein the control module turns on the pre-charge relay before turning on the main relay.
17. The method of claim 16,
Wherein the control module turns on the main relay after the precharge relay is turned on.
18. The method of claim 17,
Wherein the control module controls the pre-charge relay to be turned on,

And the main relay is turned on after a lapse of seconds.
(Where L is the inductance of the inductor and C is the capacitance of the capacitor provided between the charging and discharging terminals of the battery pack)
18. The method of claim 17,
Wherein the control module turns off the precharge relay after the main relay is turned on.
A method of receiving power from an external device or supplying power to an external device through a charging / discharging terminal of a battery pack having a battery module having two or more battery stacks connected in series,
A main relay provided on a charge / discharge line formed between the battery module and a charge / discharge terminal of the battery pack, a first node formed on a line provided between the two or more battery stacks, and a second node formed between the main relay and the charge / And a precharge circuit including a precharge line connected to a second node formed on a line provided on the line, a precharge relay provided on the precharge line, and an inductor provided on the precharge line, Preparing;
Turning on the precharge relay; And
And turning on the main relay.

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