Battery Pack with Selective Separation of Battery Module

Abstract

The present invention relates to a battery pack capable of selectively separating a plurality of battery modules, and specifically, to a battery pack characterized by comprising a pack case, a plurality of battery modules housed in the pack case, a bus bar electrically connecting the battery modules, and a module holding part for fixing the battery modules to the pack case or separating them from the pack case.

Description

Technology Field

[0001] The present invention relates to a battery pack capable of selectively separating battery modules, and more specifically, to a battery pack capable of selectively separating battery modules that can prevent major accidents such as explosions by separating a specific battery module that has occurred or is highly likely to occur within the battery pack from the battery pack. Background Technology

[0002] Recently, the demand for rechargeable batteries capable of storing generated electrical energy is increasing due to air pollution caused by the use of fossil fuels and the development of alternative energy sources resulting from energy depletion. Rechargeable rechargeable batteries are being closely utilized in daily life, such as in mobile devices, electric vehicles, and hybrid electric vehicles.

[0003] As such, the required capacity of secondary batteries, which are used as an energy source for various electronic devices that are indispensable in modern society, is increasing due to the growing usage and complexity of mobile devices and the development of electric vehicles.

[0004] To meet user demand, multiple battery cells are arranged in small devices, whereas in automobiles and the like, battery modules that electrically connect multiple battery cells or battery packs equipped with multiple such battery modules are used.

[0005] Among these secondary batteries, lithium batteries, which are known to have a high storage capacity per unit area and be the most efficient, are the most widely used.

[0006] However, secondary batteries inevitably generate heat during the charging and discharging process, and in some cases, thermal runaway can occur due to short circuits, thermal shock, or insulation breakdown, which can lead to major accidents such as fires and explosions.

[0007] In particular, vehicle fires are difficult for drivers to detect, and once they occur, rapid extinguishing is challenging, which can lead not only to the complete destruction of the vehicle but also to casualties caused by explosions.

[0008] 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 detaching the battery pack, and is structured such that the battery pack is detached by magnetic coupling or release of the first magnetic part (11) and the second magnetic part (21).

[0009] However, the prior art discloses only the attachment and detachment of battery packs that cannot be used in vehicles, as battery pack assemblies that are attached to and detached from power tools or chargers. Prior art literature

[65535] Korean Patent Publication No. 2014-0100084 The problem to be solved

[0011] In order to solve the above-mentioned problems, the present invention aims to provide a battery pack in which the battery module constituting the battery pack is detachable and can be mounted on a vehicle.

[0012] In addition, the present invention aims to provide a battery pack having a structure capable of monitoring battery modules that have a fire or a high probability of fire occurring, and separating battery modules identified as being in an abnormal state from the battery pack. means of solving the problem

[0013] To solve the above problems, the battery pack according to the present invention is characterized by comprising: 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).

[0014] In addition, in the battery pack according to the present invention, the module holding portion (400) comprises 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), wherein the motor (440) rotates repeatedly by 180°, thereby alternately generating repulsive and attractive forces between the first permanent magnet (410) and the second permanent magnet (420), so as to store or separate the battery module (200) in the pack case (100).

[0015] In addition, in the battery pack according to the present invention, the pack case (100) is provided with a support frame (111) that crosses the interior, and the motor (440) is fixed to the support frame (111).

[0016] In addition, in the battery pack according to the present invention, the first permanent magnet (410) and the second permanent magnet (420) are in the shape of a disc or a square plate, and are characterized by having an N pole and a S pole symmetrically arranged on one side.

[0017] In addition, in the battery pack according to the present invention, the motor (440) is characterized by being operated to rotate by a signal from a control unit.

[0018] In addition, the battery pack according to the present invention is characterized in that a door (122) is provided on the bottom surface of the pack case (100) so that the battery module (200) can fall downward.

[0019] In addition, in the battery pack according to the present invention, the door (122) is provided in the same number as the battery module (200).

[0020] In addition, in the battery pack according to the present invention, the pack case (100) is further provided with a door rotation part (123) for rotating the door (122) and a door opening / closing part (124).

[0021] In addition, in the battery pack according to the present invention, the door opening / closing unit (124) is characterized by being operated to convert the locked state of the door (122) to an unlocked state by a signal from the control unit.

[0022] In addition, the battery pack according to the present invention is characterized in that each of the plurality of battery modules (200) is equipped with a sensor (210) capable of detecting an abnormal state.

[0023] In addition, in the battery pack according to the present invention, the sensor (210) is characterized as being a temperature sensor.

[0024] In addition, the battery pack according to the present invention is further characterized by having a control unit that receives a signal from the sensor (210) and applies an overcurrent to the bus bar (300) when an abnormal state occurs.

[0025] In addition, the battery pack according to the present invention is characterized in that the bus bar (300) is provided with a notch-type fuse section (320).

[0026] Additionally, as a method for separating an abnormal battery module from a battery pack, in which a battery pack is mounted on a vehicle, the method comprises: a first step in which a control unit receives status information of each battery module; a second step in which the status information received in the first step determines whether it corresponds to an abnormal state; and a third step in which the battery module corresponding to an abnormal state is separated from the battery pack; wherein the third step is characterized by rotating a motor (440) such that a repulsive force is generated between a first permanent magnet (410) mounted on a battery module (200) and a second permanent magnet (420) facing the first permanent magnet (410).

[0027] In addition, in the method for separating an abnormal battery module from a battery pack according to the present invention, the third step further comprises the step of transmitting a signal to the door opening / closing unit (124) to convert the locked state of the door (122) to an unlocked state, and applying an overcurrent to the bus bar (300). Effects of the invention

[0028] As described above, according to the battery pack of the present invention, the pack case is provided with a door that can be opened and closed, and a module holding part that can fix or release each battery module is provided, so there is an advantage that a battery module in an abnormal state can be separated from the pack case.

[0029] In addition, according to the battery pack of the present invention, each battery module is equipped with a sensor so that it can monitor whether the battery module is in a normal state or an abnormal state, and since it determines whether to disconnect the battery module based on the monitoring result, it has the advantage of enabling accurate judgment.

[0030] Furthermore, according to the battery pack of the present invention, since the structure allows for the separation of an abnormal battery module from the pack case, there is an advantage in that vehicle occupants can be protected from the explosion of the battery pack, etc. Brief explanation of the drawing

[0031] FIG. 1 is a perspective view of a battery pack assembly according to the prior art. FIG. 2 is a perspective view of a battery pack according to a preferred embodiment of the present invention. FIG. 3 is an exploded view of the battery pack illustrated in FIG. 2. FIG. 4 is an enlarged perspective view of the bottom surface of the battery pack illustrated in FIG. 2. Figure 5 is a cross-sectional view of a portion of the battery pack shown in Figure 2. Figure 6 is a plan view of a portion of the battery pack shown in Figure 2. FIG. 7 is a plan view of a fuse portion used in a battery pack according to a preferred embodiment of the present invention. FIG. 8 is an enlarged perspective view illustrating the operating principle of the module holding part in the battery pack illustrated in FIG. 2. FIG. 9 is a cross-sectional view illustrating the separation of a battery module from a battery pack illustrated in FIG. 2. FIG. 10 is a perspective view illustrating the separation of a battery module from a battery pack illustrated in FIG. 2. Specific details for implementing the invention

[0032] Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0033] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0034] Hereinafter, a battery pack capable of selectively separating a battery module according to the present invention and a method for separating an abnormal battery module from the battery pack will be described with reference to the attached drawings.

[0035] 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. 2.

[0036] As illustrated in FIGS. 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 parts (400), and a control part (not shown).

[0037] Although the drawing shows multiple battery modules (200) having a cuboid shape standing upright, this is merely an example, and it is obvious that they can be arranged so that their wide sides face the bottom of the pack case (100).

[0038] First, the pack case (100) may be in the form of a box for safely storing a plurality of battery modules (200), and may be composed of a side case (110) that surrounds the side of the battery module (200) and a bottom case (120) that supports the bottom surface of the battery module (200). Of course, the side case (110) and the bottom case (120) may be formed integrally to form a single case, and it is obvious that an upper cover may be provided, although not shown in the drawing.

[0039] Meanwhile, a plurality of support frames (111) are provided on the inner upper side of the side case (110). Specifically, the support frames (111) are positioned to cross the interior of the side case (110), and both ends are fixed to the inside of the side case (110). These support frames (111) are intended to fix a motor, and this will be described later.

[0040] A support plate (121) is provided in the lower case (120) with a shape that protrudes to a predetermined height in the direction where the upper surface, i.e., the battery module (200), is located. By supporting the lower ends of the four sides of the battery module (200) or the two sides facing each other, this support plate (121) can prevent the battery module (200) from moving due to external impact.

[0041] In addition, the lower case (120) is provided with a door (122) so that a certain portion can be opened, and a door rotation part (123) for rotating the door (122) and a door opening / closing part (124) are installed.

[0042] The aforementioned door (122), door pivot part (123), and opening / closing part (124) are configured such that when the battery module is operating normally, the door (122) is closed so that the battery module (200) remains stored in the pack case (100), but when a specific battery module becomes abnormal, the door (122) is opened to separate the abnormal battery module from the pack case (100).

[0043] Therefore, it is preferable that the door (122) be located on the bottom surface of the battery module (200), and it is more preferable that it be provided in the same number as the battery module (200). Although the drawing shows the door (122) as a pair facing each other, i.e., a double door type, this is merely an example, and it may be a single door type.

[0044] One side of the door pivoting part (123) is fixed to the lower case (120) and the other side is connected to the door (122), so that the door (122) can rotate at a predetermined angle, and is not particularly limited as long as such, it may be a hinge as an example.

[0045] The door opening / closing part (124) is for controlling the opening and closing of the door (122), and on the lower case (120), more specifically, the latch (124') of the door opening / closing part (124) is provided in a position that can support the side or corner of the door (122) where the door pivot part (123) is not mounted.

[0046] Here, the door opening / closing part (124) is, for example, a solenoid-type electronic door locking member, wherein the latch (124´) moves forward or backward by an external signal, etc. Since such an electronic door locking member corresponds to known technology, a detailed description is omitted.

[0047] Next, the battery module (200) will be described. Inside the module case, a number of battery cells are stored in a vertically or horizontally stacked state, along with a cooling device, etc.

[0048] Meanwhile, the battery cell may be composed of a cell case with a pocket-shaped storage portion, an electrode assembly housed in the cell case, an electrode tab, an electrode lead, and an insulating film.

[0049] The cell case forms a storage compartment using a laminate sheet composed of an outer resin layer, a metal layer, and an inner resin layer.

[0050] The outer resin layer is located on the outer surface of the cell case, and in order to protect the electrode assembly while ensuring heat and chemical resistance, a heat-resistant polymer with excellent tensile strength, moisture barrier properties, and air barrier properties may be used for this outer resin layer, and nylon or polyethylene terephthalate may be used as examples, but is not limited thereto.

[0051] The metal layer in contact with the outer resin layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a lightweight aluminum thin film with excellent formability can be used as a preferred material for this metal layer.

[0052] Furthermore, since the inner resin layer comes into direct contact with the electrode assembly, it must possess insulation and electrostatic resistance. Additionally, to ensure sealing from the outside, the sealing area formed by the thermal bonding of the inner layers must have excellent thermal bonding strength.

[0053] The material for this internal resin layer may be selected from, but is not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties; however, polypropylene is most preferred due to its excellent mechanical properties such as tensile strength, stiffness, surface hardness, and impact strength, as well as its chemical resistance.

[0054] The electrode assembly housed in the cell case may 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-type cathode and an anode and then wound; a stack type electrode assembly composed of unit cells having a structure in which rectangular anodes and cathodes are stacked with a separator interposed between them; a stack-folding type electrode assembly in which unit cells are wound by a long separating film; or a lamination-stack type electrode assembly in which unit cells are stacked with a separator interposed between them and attached to one another.

[0055] Specifically, the cathode is manufactured by applying a slurry mixed with a cathode active material and a binder to a cathode current collector.

[0056] Here, as the negative electrode active material, carbon such as non-graphitizable carbon, graphite-based carbon, etc.; Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1), Sn x Me 1-x Metal composite oxides such as Me'yOz (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, elements of Group 1, Group 2, and Group 3 of the periodic table, halogens; 0≤x≤1; 1≤y≤3; 1≤z≤8); lithium metal; lithium alloy; silicon alloy; tin alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni based materials; Si-based materials such as Si, SiO, SiO2 alone or a mixture thereof, etc. may be used, but are not limited to these.

[0057] The positive electrode is manufactured by applying a slurry mixed with a positive electrode active material and a binder to a positive electrode current collector.

[0058] And as the positive electrode active material, layered compounds such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2), or compounds substituted with one or more transition metals; chemical formula Li 1+x Mn 2-x Lithium manganese oxides such as O4 (where x is 0 to 0.33), LiMnO3, LiMn2O3, LiMnO2, etc.; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, LiFe3O4, V2O5, Cu2V2O7, etc.; chemical formula LiNi 1-x M x Ni-site type lithium nickel oxide represented by O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 ~ 0.3); chemical formula LiMn 2-x M x Examples include lithium manganese complex oxides represented by O2 (where M = Co, Ni, Fe, Cr, Zn or Ta and x = 0.01 to 0.1) or Li2Mn3MO8 (where M = Fe, Co, Ni, Cu or Zn); LiMn2O4 in which part of the Li in the chemical formula is substituted with alkaline earth metal ions; disulfide compounds; Fe2(MoO4)3, but are not limited to these.

[0059] Meanwhile, the cathode current collector and the anode current collector are composed of a portion coated with a slurry mixed with active material and a portion not coated with the slurry. The electrode tab is formed by cutting the portion not coated or by connecting a separate conductive member to the portion not coated with the slurry using ultrasonic welding or the like.

[0060] Electrode leads are connected to these electrode tabs by spot welding or the like, and an insulating film is positioned around the electrode leads.

[0061] Meanwhile, it is preferable to further provide a sensor (210) on the outer or inner surface of the battery module (200) to check for a normal or abnormal state. The battery module (200) undergoes repeated charging and discharging, and due to various internal or external causes, a fire may occur in a specific battery module (200) or the temperature may rise excessively above the normal range.

[0062] The aforementioned 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 capable of measuring the temperature of the battery module.

[0063] For example, if the measured temperature exceeds the normal operating temperature range of the battery module, it can be determined that the battery module equipped with the sensor is overheated and there is a high possibility of fire or that a fire has occurred.

[0064] Next, we will describe the bus bar (300). The bus bar (300) is intended to connect multiple battery modules (200) in series or in parallel. It is provided with fastening holes (310) on both edges for electrically connecting to external terminals (220) of the battery modules (200), while a fuse section (320) may be provided in the center so that it can be cut when an overcurrent is applied.

[0065] For example, when both ends are made of copper (Cu) material which has relatively low resistance and a high melting point, and the central fuse part (320) is made of aluminum (Al) material which has higher resistance and a lower melting point than copper (Cu), when an overcurrent is applied, the aluminum (Al) fuse part (320) is cut.

[0066] FIG. 5 is a modified example of a busbar used in the battery pack of the present invention. As shown in FIG. 5, a notch may be formed in the fuse portion (320). When a notch is provided in the fuse portion (320), the area through which current can flow is reduced, causing the temperature to rise rapidly as resistance increases, and consequently, the fuse portion (320) can be quickly cut when an overcurrent is applied.

[0067] Referring again to FIGS. 2 to 4, the module holding part (400) is for fixing the battery module (200) to the pack case (100) or separating it from the pack case (100), and a detailed description will be provided later.

[0068] FIG. 6 is a cross-sectional view of a part of the battery pack shown in FIG. 2, FIG. 7 is a plan view of a part of the battery pack shown in FIG. 2, and FIG. 8 is an enlarged perspective view explaining the operating principle of the module holding part in the battery pack shown in FIG. 2.

[0069] Referring to FIGS. 6 and 7, the module holding part (400) may be configured to 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) with one side connected to the second permanent magnet (420), and a motor (440) connected to the rotating shaft (430).

[0070] Specifically, the first permanent magnet (410) and the second permanent magnet (420) are arranged such that the N pole and the S pole are symmetrically positioned on a circular or square plate. Therefore, when the S pole and the N pole of the second permanent magnet (420) are respectively positioned on the upper surface of the N pole and the S pole of the first permanent magnet (410), an attractive force is exerted, and conversely, when the second permanent magnet (420) is rotated 180° horizontally so that the N pole and the S pole are respectively positioned on the upper surface of the N pole and the S pole of the first permanent magnet (410), a repulsive force is exerted.

[0071] The rotating shaft (430) and the motor (440) are for adjusting the N and S pole positions of the second permanent magnet (420). The motor (440) may be seated on the upper support frame (111) of the pack case (100), but if an upper cover is provided, it may be fixed to the upper cover.

[0072] Here, the motor (440) is not specifically limited as long as it can rotate by a signal from the control unit, and as an example, it may be a stepping motor, and the controller may be provided inside the battery pack (100) or may be an integrated stepping motor with a built-in drive controller.

[0073] FIG. 9 is a cross-sectional view illustrating the separation of a battery module from a battery pack illustrated in FIG. 2, and FIG. 10 is a perspective view illustrating the separation of a battery module from a battery pack illustrated in FIG. 2.

[0074] With reference to Figures 9 and 10, the principle of how a battery module is separated from a battery pack will be explained.

[0075] The temperature is measured from a sensor (210) mounted on each of the multiple battery modules (200), and when the temperature of any specific 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).

[0076] Specifically, a signal is transmitted to the door opening / closing unit (124) so ​​that the latch (124') supporting the door (122) is moved backward, allowing the door (122) to rotate downward. Additionally, 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).

[0077] Therefore, the abnormal battery module (200) falls down below the pack case (100) by its own weight through the opening (S).

[0078] Meanwhile, it is more desirable to transmit a signal to apply an overcurrent to the battery module (200) so that when the temperature of a specific battery module (200) rises above a certain temperature, the fuse portion (320) of the bus bar (300) can be quickly cut.

[0079] A method for separating an abnormal battery module from a battery pack, wherein the aforementioned battery pack is mounted on a vehicle, may be configured to include a first step in which a control unit receives status information from each battery module, a second step in which the status information received in the first step corresponds to an abnormal state, and a third step in which the battery module corresponding to an abnormal state is separated from the battery pack.

[0080] Here, the third step may further include the step of rotating the motor (440) to generate a repulsive force between the first permanent magnet (410) mounted on the battery module (200) as described above and the second permanent magnet (420) facing the first permanent magnet (410), transmitting a signal to the door opening / closing unit (124) to convert the locked state of the door (122) to an unlocked state, and, if necessary, applying an overcurrent to the bus bar (300).

[0081] The present invention has been described above with reference to specific embodiments. However, those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above description. Explanation of the symbols

[0083] 100: Pack Case 110: Side case 111: Support Frame 120: Lower case 121: Support plate 122: Door 123: Door pivot 124: Door opening / closing part 124´: Latch 200: Battery module 210: Sensor 220: External terminal 300: Busbar 310: Fastening hole 320: Fuse section 400: Module holding part 410: First permanent magnet 420: Second permanent magnet 430: Rotation axis 440: Motor S: Opening

Claims

Claim 1 A battery pack comprising: a pack case; a plurality of battery modules stored in the pack case; a bus bar electrically connecting the battery modules; and a module holding part for fixing the battery modules to the pack case or separating them from the pack case; wherein the pack case comprises a side case that surrounds the side of the battery module, a lower case that supports the lower surface of the battery module and is equipped with a door, and a plurality of support frames whose ends are fixed to the inside of the side case; and wherein the module holding part comprises a first permanent magnet mounted on the battery module, a second permanent magnet facing the first permanent magnet, a rotating shaft with one side connected to the second permanent magnet, and a motor connected to the rotating shaft and fixed to the support frame, and wherein the motor rotates repeatedly by 180°, thereby alternately generating repulsive and attractive forces between the first permanent magnet and the second permanent magnet, so as to store the battery modules in the pack case or drop the battery modules downward through the door to separate them. Claim 2 delete Claim 3 delete Claim 4 A battery pack according to claim 1, characterized in that the first permanent magnet and the second permanent magnet are in the shape of a disc or a square plate, and the N pole and S pole are symmetrically arranged on one side. Claim 5 A battery pack according to claim 1, characterized in that the motor is operated to rotate by a signal from a control unit. Claim 6 delete Claim 7 A battery pack according to claim 1, characterized in that the doors are provided in the same number as the battery modules. Claim 8 A battery pack according to claim 1, characterized in that the lower case further comprises a door pivot part for pivoting the door and a door opening / closing part. Claim 9 A battery pack according to claim 8, characterized in that the door opening / closing unit operates to convert the locked state of the door to an unlocked state by a signal from the control unit. Claim 10 A battery pack according to claim 1, characterized in that each of the plurality of battery modules is equipped with a sensor capable of detecting an abnormal state. Claim 11 A battery pack characterized in that, in item 10, the sensor is a temperature sensor. Claim 12 A battery pack according to claim 10, further comprising a control unit that receives a signal from the sensor and applies an overcurrent to the busbar when in an abnormal state. Claim 13 A battery pack according to claim 12, characterized in that the busbar is provided with a notch-type fuse section. Claim 14 A method for separating an abnormal battery module from a battery pack, wherein a battery pack described in any one of claims 1, 4, 5, 7 through 13 is mounted in a vehicle, and the method comprises: a first step in which a control unit receives status information from each battery module; a second step in which the status information received in the first step corresponds to an abnormal state; and a third step in which the battery module corresponding to an abnormal state is separated from the battery pack; wherein the third step is characterized by rotating a motor such that a repulsive force is generated between a first permanent magnet mounted on the battery module and a second permanent magnet facing the first permanent magnet. Claim 15 A method for separating an abnormal battery module from a battery pack, wherein, in claim 14, the third step further comprises the step of transmitting a signal to a door opening / closing unit provided in the lower case to convert the locked state of the door to an unlocked state, and applying an overcurrent to the bus bar.

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