Battery pack with selective separation of battery modules

Abstract

The present invention relates to a battery pack in which a plurality of battery modules can be selectively separated, and more particularly, to a battery pack including a pack case, a plurality of battery modules housed in the pack case, bus bars electrically connecting the battery modules, and a module holding portion for fixing the battery modules to the pack case or separating them from the pack case.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 2022-0054023 filed on May 2, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack capable of selectively separating battery modules, and more particularly, to a battery pack capable of selectively separating battery modules, which can prevent major accidents such as explosions in advance by separating from the battery pack a specific battery module that may cause or is likely to cause a fire within the battery pack. [Background technology]

[0003] Recently, the demand for secondary batteries that can store electrical energy produced by the development of alternative energy sources due to air pollution caused by the use of fossil fuels and energy depletion is increasing. Rechargeable secondary batteries are used in mobile devices, electric vehicles, hybrid electric vehicles, etc., and are closely related to daily life.

[0004] As described above, secondary batteries are used as energy sources for various electronic devices that are indispensable in modern society, and the required capacity is increasing due to the increased use and complication of mobile devices and the development of electric vehicles, etc.

[0005] In order to meet user demand, small devices are equipped with a large number of battery cells, while automobiles and the like use battery modules that electrically connect a large number of battery cells or battery packs that include a large number of such battery modules.

[0006] Among these secondary batteries, lithium batteries, which are known to be the most efficient and have a high storage capacity per unit area, are the most widely used.

[0007] However, secondary batteries inevitably generate heat during the charging and discharging process. In some cases, thermal runaway can occur due to short circuits, thermal shock, insulation breakdown, etc., which can lead to serious accidents such as fires and explosions.

[0008] In particular, vehicle fires are difficult for drivers to recognize, and when a fire does occur, it is difficult to quickly put out the fire, which can lead to not only the vehicle being completely burned down, but also explosions and other fatal accidents.

[0009] Fig. 1 is a perspective view of a battery pack assembly according to the prior art. As shown in Fig. 1, the battery pack assembly includes a battery pack 10 having a first magnetic part 11, and a detachable part 20 having a second magnetic part 21 for attaching and detaching the battery pack, and the battery pack is attached and detached by coupling or uncoupling the first magnetic part 11 and the second magnetic part 21 due to the magnetism.

[0010] However, the prior art only discloses a battery pack assembly that is detachable from a power tool or a charger, and cannot be used in a vehicle. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Korean Patent Publication No. 10-2014-010084 Summary of the Invention [Problem to be solved by the invention]

[0012] In order to solve the above problems, an object of the present invention is to provide a battery pack in which a battery module constituting the battery pack can be detachably mounted on a vehicle.

[0013] Another object of the present invention is to provide a battery pack having a structure capable of monitoring a battery module that may cause a fire or has a high possibility of causing a fire, and isolating a battery module determined to be in an abnormal state from the battery pack. [Means for solving the problem]

[0014] In order to solve the above problems, the battery pack according to the present invention is characterized by including a pack case (100), a plurality of battery modules (200) housed in the pack case (100), a bus bar (300) electrically connecting the battery modules (200), and a module holding part (400) for fixing the battery modules (200) to the pack case (100) or separating them from the pack case (100).

[0015] In addition, in the battery pack according to the present invention, the module holding part (400) includes a first permanent magnet (410) mounted on the battery module (200), a second permanent magnet (420) facing the first permanent magnet (410), a rotating shaft (430) one side of which is connected to the second permanent magnet (420), and a motor (440) connected to the rotating shaft (430), and the motor (440) repeatedly rotates by 180° to alternately generate repulsive and attractive forces between the first permanent magnet (410) and the second permanent magnet (420), thereby storing the battery module (200) in the pack case (100) or separating the battery module (200) from the pack case (100).

[0016] In the battery pack according to the present invention, the pack case (100) includes a support frame (111) extending across the inside thereof, and the motor (440) is fixed to the support frame (111).

[0017] In addition, in the battery pack according to the present invention, the first permanent magnet (410) and the second permanent magnet (420) have a shape of a circular plate or a rectangular plate, and are configured so that the N pole and the S pole are symmetrical on one side.

[0018] In the battery pack according to the present invention, the motor (440) rotates in response to a signal from a control unit.

[0019] In the battery pack according to the present invention, the bottom surface of the pack case (100) includes a door (122) so that the battery module (200) can be dropped downward.

[0020] In the battery pack according to the present invention, the number of the doors (122) is the same as the number of the battery modules (200).

[0021] In the battery pack according to the present invention, the pack case (100) further includes a door pivot part (123) for pivoting the door (122) and a door opening / closing part (124).

[0022] In the battery pack according to the present invention, the door opening / closing unit (124) is operable to change the locked state of the door (122) to an unlocked state in response to a signal from a control unit.

[0023] In the battery pack according to the present invention, each of the plurality of battery modules (200) includes a sensor (210) capable of detecting an abnormal state.

[0024] In the battery pack according to the present invention, the sensor (210) is a temperature sensor.

[0025] In addition, the battery pack according to the present invention further includes a control unit that receives a signal from the sensor (210) and applies an overcurrent to the bus bar (300) when an abnormality occurs.

[0026] In the battery pack according to the present invention, the bus bar (300) includes a notch-type fuse portion (320).

[0027] Also, a method for separating a battery module in an abnormal state from a battery pack in a vehicle equipped with a battery pack includes a first step in which a control unit receives status information of each of a plurality of battery modules, a second step in which a control unit determines whether the status information received in the first step corresponds to an abnormal state, and a third step in which a battery module corresponding to the abnormal state is separated from the battery pack, wherein the third step is characterized in that a motor (440) is rotated so that a repulsive force is generated between a first permanent magnet (410) attached to the battery module (200) corresponding to the abnormal state and a second permanent magnet (420) facing the first permanent magnet (410).

[0028] In addition, in the method for separating an abnormal battery module from a battery pack according to the present invention, the third step further includes the steps of transmitting a signal to the door opening / closing unit (124) to convert a locked state of the door (122) to an unlocked state, and applying an overcurrent to the bus bar (300). Effect of the Invention

[0029] As described above, the battery pack according to the present invention has an advantage that the pack case is provided with an openable / closable door and module holding parts that can fix and separate each battery module, thereby making it possible to separate an abnormal battery module from the pack case.

[0030] In addition, according to the battery pack of the present invention, since each battery module is equipped with a sensor, it is possible to monitor whether the battery module is in a normal state or an abnormal state, and whether or not the battery modules should be separated is determined based on the monitoring result, which has the advantage of enabling an accurate judgment.

[0031] Furthermore, the battery pack according to the present invention has a structure that allows an abnormal battery module to be separated from the pack case, which has the advantage of being able to protect vehicle occupants from the risk of an explosion of the battery pack, etc. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a perspective view of a battery pack assembly according to the prior art. [Diagram 2] 1 is a perspective view of a battery pack according to a preferred embodiment of the present invention; [Diagram 3] FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2. [Figure 4] 3 is an enlarged perspective view of the bottom surface of the battery pack shown in FIG. 2. [Diagram 5] 13 shows a modified example of a bus bar used in the battery pack of the present invention. [Figure 6] 3 is a cross-sectional view of a portion of the battery pack shown in FIG. 2. [Figure 7] FIG. 3 is a plan view of a portion of the battery pack shown in FIG. 2. [Figure 8] 3 is an enlarged perspective view illustrating the operating principle of a module holding portion in the battery pack shown in FIG. 2. [Figure 9] 3 is a cross-sectional view illustrating a state in which a battery module is separated from the battery pack shown in FIG. 2. [Figure 10] 3 is a perspective view for explaining a state in which the battery modules are separated from each other in the battery pack shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which a person having ordinary skill in the art to which the present invention pertains can easily carry out the present invention. However, when describing the operation principle of the preferred embodiment of the present invention in detail, detailed description of related well-known functions or configurations will be omitted if it is determined that such detailed description may unnecessarily obscure the gist of the present invention.

[0034] In addition, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only the case where the part is directly connected to another part, but also the case where the part is indirectly connected via another element between the two parts. In addition, when a part includes a certain component, it does not mean that the other component is excluded, but that the part may further include the other component, unless otherwise specified.

[0035] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a battery pack capable of selectively separating battery modules and a method for separating an abnormal battery module from the battery pack according to the present invention will be described with reference to the accompanying drawings.

[0036] FIG. 2 is a perspective view of a battery pack according to a preferred embodiment of the present invention, FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2, and FIG. 4 is an enlarged perspective view of the bottom surface of the battery pack shown in FIG.

[0037] As shown in Figures 2 to 4, a battery pack according to a preferred embodiment of the present invention includes a pack case 100, a plurality of battery modules 200, a bus bar 300 that electrically connects the battery modules 200, a plurality of module holding units 400, and a control unit (not shown).

[0038] Although the drawings show a number of battery modules 200 having a hexahedral shape standing upright, it will be apparent that this is merely an example and that the wider side can also be arranged toward the bottom of the pack case 100.

[0039] First, the pack case 100 may have a box shape for safely storing a plurality of battery modules 200, and may be composed of a side case 110 surrounding the sides of the battery modules 200 and a bottom case 120 supporting the bottom of the battery modules 200. Of course, the side case 110 and the bottom case 120 may be integrally formed to form a single case, and it is clear that an upper cover may be provided, although not shown in the drawings.

[0040] Meanwhile, a plurality of support frames 111 are provided on the upper inside of the side case 110. More specifically, the support frames 111 are positioned across the inside of the side case 110, and both side ends are fixed to the inside of the side case 110. Such support frames 111 are for fixing a motor, which will be described later.

[0041] The lower case 120 is provided with a support plate 121 that protrudes to a predetermined height from an upper surface, i.e., in a direction in which the battery module 200 is located. The support plate 121 supports lower ends of four surfaces or two surfaces facing each other of the battery module 200, thereby preventing the battery module 200 from moving freely due to an external impact.

[0042] The lower case 120 is provided with a door 122 so that a predetermined portion can be opened, and is also provided with a door rotation portion 123 for rotating the door 122 and a door opening / closing portion 124.

[0043] The aforementioned door 122, door pivot portion 123 and opening / closing portion 124 are configured to maintain the battery module 200 housed in the pack case 100 with the door 122 closed when the battery module is operating normally, but when a specific battery module is in an abnormal state, to open the door 122 and separate the abnormal battery module from the pack case 100.

[0044] Therefore, the doors 122 are preferably located on the bottom surface of the battery module 200, and more preferably the same number of doors are provided as the battery modules 200. Although the drawings show the doors 122 as a pair facing each other, i.e., as a double-door type, this is merely an example, and the doors may be of a single-door type.

[0045] The door pivot part 123 is not particularly limited as long as one side is fixed to the lower case 120 and the other side is connected to the door 122 so that the door 122 can pivot at a predetermined angle. For example, the door pivot part 123 may be a hinge.

[0046] The door opening / closing part 124 is for controlling the opening and closing of the door 122, and is provided on the underside of the lower case 120, more specifically, at a position where a latch 124' of the door opening / closing part 124 can support a side or corner of the door 122 to which the door pivot part 123 is not attached.

[0047] Here, the door opening / closing unit 124 is, for example, a solenoid-type electronic door lock member, and the latch 124' moves forward or backward in response to an external signal, etc., and such an electronic door lock member corresponds to a well-known technology, so detailed description is omitted.

[0048] Next, a description will be given of the battery module 200. A number of battery cells are housed vertically or horizontally stacked together with a cooling device and the like inside the module case.

[0049] Meanwhile, a battery cell may be composed of a cell case having a pocket-shaped receiving portion, an electrode assembly housed in the cell case, an electrode tab, an electrode lead, and an insulating film.

[0050] The cell case uses a laminate sheet consisting of an outer resin layer, a metal layer, and an inner resin layer to form a storage section.

[0051] The outer resin layer is located on the outer periphery of the case, and may be made of a heat-resistant polymer having excellent tensile strength, moisture permeability, and air permeability so as to ensure heat resistance and chemical resistance while protecting the electrode assembly. Examples of the outer resin layer include, but are not limited to, nylon or polyethylene terephthalate.

[0052] The metal layer in contact with the external resin layer corresponds to a barrier layer that prevents moisture and various gases from penetrating into the inside of the battery from the outside. A preferred material for such a metal layer is an aluminum thin film, which is lightweight yet has excellent formability.

[0053] In addition, since the internal resin layer is in direct contact with the electrode assembly, it must have insulating properties and electrolysis resistance, and in order to seal against the outside, the sealing portion where the internal layers are thermally bonded must have excellent thermal adhesion strength.

[0054] The material of the inner resin layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and sealing properties, polyurethane resins, and polyimide resins, but is not limited thereto. Polypropylene is most preferred because of its excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, as well as chemical resistance.

[0055] The electrode assembly housed in the case can be composed of, but is not limited to, a jelly roll type electrode assembly having a structure in which a separator is interposed between a long sheet-like negative electrode and a positive electrode and then wound, a stack type electrode assembly composed of unit cells having a structure in which a rectangular positive electrode and a negative electrode are laminated with a separator interposed therebetween, a stack-folding type electrode assembly in which the unit cells are wound by a long separation film, or a lamination-stack type electrode assembly in which the unit cells are laminated with a separator interposed therebetween and adhered to each other.

[0056] Specifically, the negative electrode is manufactured by applying a slurry in which a negative electrode active material and a binder are mixed to a negative electrode current collector.

[0057] Here, examples of the negative electrode active material include carbon such as graphitizable carbon and graphite-based carbon; Li x Fe 2 O 3 (0 ≦ x ≦ 1), Li x WO 2 (0 ≦ x ≦ 1), Sn x Me 1-x Me’ y O z (Me: Mn, Fe, Pb, Ge; Me’: Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 < x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8) and other metal composite oxides; lithium metal; lithium alloy; silicon-based alloy; tin-based alloy; SnO, SnO 2 、PbO、PbO 2 、Pb 2 O 3 、Pb 3 O 4 、Sb 2 O 3 、Sb 2 O 4 、Sb 2 O 5 、GeO、GeO 2 、Bi 2 O 3 、Bi 2 O 4 、Bi 2 O 5Metal oxides such as polyacethylene; conductive polymers such as Li-Co-Ni materials; Si, SiO, SiO 2 The above-mentioned materials alone or in combination with a Si-based material can be used, but the present invention is not limited to these.

[0058] The positive electrode is manufactured by applying a slurry in which a positive electrode active material and a binder are mixed onto a positive electrode current collector.

[0059] The positive electrode active material is lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ) or compounds substituted with one or more transition metals; 1+x Mn 2-x O 4 (where x is 0 to 0.33), LiMnO 3 , LiMn 2 O 3 , LiMnO 2 Lithium manganese oxides such as lithium copper oxide (Li 2 CuO 2 );LiV 3 O 8 , LiV 3 O 4 , V 2 O 5 , Cu 2 V 2 O 7 Vanadium oxides such as LiNi 1-x MxO 2 (where M=Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x=0.01 to 0.3); 2-x M x O 2 (wherein M=Co, Ni, Fe, Cr, Zn or Ta, and x=0.01 to 0.1) or Li 2 Mn 3 MO 8Lithium manganese oxides represented by the formula (where M = Fe, Co, Ni, Cu, or Zn); LiMn 2 O 4 ;Disulfide compounds;Fe 2 (MoO 4 ) 3 These can include, but are not limited to, the following.

[0060] Meanwhile, the negative electrode current collector and the positive electrode current collector are composed of a portion coated with a slurry containing an active material and a plain portion where the slurry is not coated, and the plain portion is cut to form an electrode tab, or a separate conductive member is connected to the plain portion by ultrasonic welding or the like.

[0061] An electrode lead is connected to the electrode tab by spot welding, and an insulating film is disposed around the electrode lead.

[0062] Meanwhile, it is preferable to further provide a sensor 210 for checking a normal state or an abnormal state on an outer or inner surface of the battery module 200. The battery module 200 is repeatedly charged and discharged. At this time, a fire may occur or the temperature may excessively rise above the normal range in a specific battery module 200 due to various internal or external causes.

[0063] The sensor 210 is a sensor for determining whether the battery module 200 is in an abnormal state as described above, and may be a temperature sensor for measuring the temperature of the battery module.

[0064] For example, when the measured temperature exceeds the normal operating temperature range of the battery module, it can be determined that the battery module to which the sensor is attached has overheated, raising the possibility of a fire or that a fire has occurred.

[0065] Next, a description will be given of the bus bar 300. The bus bar 300 is for connecting a plurality of battery modules 200 in series or parallel, and may have fastening holes 310 at both ends for electrically connecting to external terminals 220 of the battery modules 200, and may have a fuse unit 320 in the center to be cut off when an overcurrent is applied.

[0066] For example, when both side ends are made of copper (Cu) material, which has a relatively low resistance but a high melting point, and the central fuse portion 320 is made of aluminum (Al) material, which has a higher resistance than copper (Cu) but a lower melting point, when an overcurrent is applied, the aluminum (Al) fuse portion 320 is cut.

[0067] 5 shows a modified example of a bus bar used in a battery pack of the present invention. As shown in FIG 5, a notch may be formed in the fuse portion 320. When the fuse portion 320 is provided with a notch, the area through which current flows is reduced, and the temperature increases quickly due to an increase in resistance, so that the fuse portion 320 can be quickly cut when an overcurrent is applied.

[0068] 2 to 4, the module holding part 400 is for fixing the battery module 200 to the pack case 100 or separating the battery module 200 from the pack case 100, and will be described in detail later.

[0069] 6 is a cross-sectional view of a portion of the battery pack shown in FIG. 2, FIG. 7 is a plan view of a portion of the battery pack shown in FIG. 2, and FIG. 8 is an enlarged perspective view explaining the operating principle of the module holding portion in the battery pack shown in FIG. 2.

[0070] 6 and 7, the module holding unit 400 may include a first permanent magnet 410 mounted on the battery module 200, a second permanent magnet 420 facing the first permanent magnet 410, a rotating shaft 430 having one side connected to the second permanent magnet 420, and a motor 440 connected to the rotating shaft 430.

[0071] Specifically, the first permanent magnet 410 and the second permanent magnet 420 are made of a disk or a square plate, and are arranged so that the N pole and the S pole are symmetrical to each other. Therefore, when the S pole and the N pole of the second permanent magnet 420 are located above the N pole and the S pole of the first permanent magnet 410, respectively, an attractive force acts, and conversely, when the second permanent magnet 420 is rotated 180 degrees horizontally and the N pole and the S pole are located above the N pole and the S pole of the first permanent magnet 410, respectively, a repulsive force acts.

[0072] The rotating shaft 430 and the motor 440 are used to adjust the positions of the north and south poles of the second permanent magnet 420. The motor 440 can be mounted on the upper part of the support frame 111 of the pack case 100, but if an upper cover is provided, it may be fixed to the upper cover.

[0073] Here, the motor 440 is not particularly limited as long as it can rotate in response to a signal from a control unit, and may be, for example, a stepping motor. The controller may be provided inside the pack case 100, or it may be an integrated stepping motor with a built-in driving controller.

[0074] 9 is a cross-sectional view for explaining a state in which the battery modules are separated in the battery pack shown in FIG. 2, and FIG. 10 is a perspective view for explaining a state in which the battery modules are separated in the battery pack shown in FIG.

[0075] The principle of separating the battery module from the battery pack will be described with reference to FIGS.

[0076] The temperature is measured by a sensor 210 attached to each of the multiple battery modules 200, and when the temperature of any particular battery module 200 rises above a certain temperature, the control unit transmits a signal to the door opening / closing unit 124 and / or the motor 440.

[0077] Specifically, a signal is transmitted to the door opening / closing unit 124 so that the latch 124' supporting the door 122 can be moved backward to rotate the door 122 downward. Also, a signal is transmitted to rotate the motor 440 so that a repulsive force acts between the first permanent magnet 410 and the second permanent magnet 420 mounted on the upper part of the battery module 200.

[0078] Therefore, the battery module 200 in the abnormal state falls under the pack case 100 through the opening S due to its own weight.

[0079] Meanwhile, when the temperature of a specific battery module 200 rises above a certain temperature, it is more preferable to transmit a signal to apply an overcurrent to the battery module 200 so that the fuse unit 320 of the bus bar 300 is quickly cut off.

[0080] In a vehicle equipped with the above-mentioned battery pack, a method for separating a battery module in an abnormal state from the battery pack may include a first step in which a control unit receives status information from each of the battery modules, a second step in which a control unit determines whether the status information received in the first step corresponds to an abnormal state, and a third step in which a battery module corresponding to the abnormal state is separated from the battery pack.

[0081] Here, in the third step, as described above, the motor 440 is rotated so as to generate a repulsive force between the first permanent magnet 410 mounted on the battery module 200 corresponding to the abnormal state and the second permanent magnet 420 facing the first permanent magnet 410, and a signal is transmitted to the door opening / closing unit 124 to convert the locked state of the door 122 to an unlocked state, and if necessary, the third step may further include a step of applying an overcurrent to the bus bar 300.

[0082] Although the present invention has been described above with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications and variations within the scope of the present invention may be made based on the above description. [Explanation of symbols]

[0083] 100 pack case 110 Side Case 111 Support frame 120 Lower Case 121 Support Plate 122 Doors 123 Door rotation part 124 Door opening and closing part 124' Latch 200 Battery Module 210 Sensors 220 External terminal 300 Busbar 310 Concluding Hole 320 Fuse section 400 Module holding section 410 First permanent magnet 420 Second permanent magnet 430 Rotational Axis 440 Motor S open mouth

Claims

1. A battery pack to be mounted on a vehicle, comprising: Pack case and A plurality of battery modules housed in the pack case; A bus bar electrically connecting the battery modules; a module holding portion for fixing the battery module to the pack case or separating the battery module from the pack case, the module holding part includes: a first permanent magnet attached to the battery module; a second permanent magnet facing the first permanent magnet; a rotating shaft having one side connected to the second permanent magnet; and a motor connected to the rotating shaft; The motor repeatedly rotates by 180° to alternately generate repulsive and attractive forces between the first permanent magnet and the second permanent magnet, thereby storing the battery module in the pack case and separating the battery module from the pack case.

2. 2. The battery pack according to claim 1, wherein the pack case includes a support frame extending across an interior thereof, and the motor is fixed to the support frame.

3. The battery pack according to claim 1 , wherein the first permanent magnet and the second permanent magnet have a shape of a circular plate or a rectangular plate, and are configured such that a north pole and a south pole are symmetrical on one surface.

4. The battery pack according to claim 1 , wherein the motor rotates in response to a signal from a control unit.

5. The battery pack according to claim 1 , wherein a bottom surface of the pack case includes a door through which the battery module can be dropped downward.

6. The battery pack according to claim 5 , wherein the number of the doors is the same as the number of the battery modules.

7. The battery pack according to claim 5 , wherein the pack case further comprises a door pivot portion and a door opening / closing portion for pivoting the door.

8. The battery pack according to claim 7 , wherein the door opening / closing unit operates to convert the locked state of the door into an unlocked state in response to a signal from a control unit.

9. The battery pack of claim 1 , wherein each of the plurality of battery modules includes a sensor capable of sensing an abnormal condition.

10. The battery pack of claim 9 , wherein the sensor is a temperature sensor.

11. The battery pack of claim 9 , further comprising a controller that receives a signal from the sensor and applies an overcurrent to the bus bar in the event of an abnormal condition.

12. 12. The battery pack of claim 11, wherein the bus bar includes a notch-type fuse portion.

13. A method for separating a battery module in an abnormal state from a battery pack in a vehicle equipped with the battery pack according to any one of claims 1 to 12, comprising: A first step in which a control unit receives status information from each of a plurality of battery modules; a second step of determining whether the status information received in the first step corresponds to an abnormal state; and a third step of isolating the battery module corresponding to the abnormal state from the battery pack; The third step is a method for separating a battery module in an abnormal state from a battery pack, comprising rotating a motor so that a repulsive force is generated between a first permanent magnet attached to the battery module corresponding to the abnormal state and a second permanent magnet facing the first permanent magnet.

14. The method for isolating a battery module in an abnormal state from a battery pack according to claim 13, wherein the third step further includes the steps of transmitting a signal to the door opening / closing unit to convert a locked state of the door to an unlocked state and applying an overcurrent to the bus bar.

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