Battery pack with current passage and blocking unit

Abstract

The battery pack according to the present invention comprises: a plurality of battery modules; a battery pack tray in which the battery module is accommodated and a top portion of which is provided in an open form; a pack cover disposed on the pack tray such that an accommodation space in which the battery module is accommodated is sealed; and a current passing and blocking unit arranged between the pack tray and the pack cover so that a current passes through and supports module connection bus bars for connecting the battery modules to each other, and if a thermal event occurs, the module connection bus bars are disconnected so as to block an electrical connection between the battery modules.

Description

Technical Field

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack that can easily discharge gases generated when a fire occurs inside a battery module to the outside, and prevent flames or high-temperature particles from leaking to the outside, thereby preventing or delaying chain fires of other adjacent battery modules to the greatest extent.

[0002] This application claims priority to Korean Patent Application No. 10-2022-0134232 filed on October 18, 2022, and all contents disclosed in the specification and drawings of that application are incorporated into this application by reference. Background Art

[0003] In contrast to primary batteries, which cannot be used again after one use, secondary batteries convert electrical energy into chemical energy and can be recharged in a semi-permanent manner.

[0004] Secondary batteries include lithium secondary batteries, nickel-cadmium (Ni-Cd) batteries, lead-acid batteries, nickel-metal hydride (Ni-MH) batteries, zinc-air batteries, alkaline-manganese batteries, etc. Among these batteries, lead-acid batteries and lithium secondary batteries are the most popular secondary batteries.

[0005] In particular, lithium secondary batteries have high energy storage density, light weight, compact size, high safety, low discharge rate and long life, and due to these advantages, they have been widely used as electric vehicle batteries in recent years. For reference, lithium secondary batteries are generally divided into cylindrical, square and pouch types according to their shape, and have a wide range of applications, including electric vehicles as well as energy storage systems (ESS) and other electrical devices.

[0006] Currently, lithium secondary battery cells have an operating voltage of about 2.5 V to 4.5 V. Therefore, in order to use secondary batteries as an energy source for electric vehicles, lithium-ion battery cells are connected in series and / or in parallel to form battery modules, and the battery modules are connected in series and / or in parallel to form a battery pack.

[0007] On the other hand, since secondary batteries involve chemical reactions during charging and discharging, when they are used in a temperature environment higher than the optimal temperature, performance degradation may occur, and in the event of failure of thermal control to the optimal temperature, there is a risk of accidental fire or explosion. In addition, the battery module has a structure in which secondary batteries are densely packed in a module housing, and the battery modules are electrically connected to each other through bus bars.

[0008] Therefore, when a thermal event occurs due to a fire triggered by any secondary battery, an internal short circuit occurs, and the spread of the fire to other battery cells is accelerated.

[0009] Therefore, when a thermal event occurs in a battery module, the electrical connection between other adjacent battery cells must be disconnected to prevent an internal short circuit of the normal battery module and to prevent heat propagation that causes a fire to spread to all battery packs, thereby enhancing safety. Summary of the invention

[0010] Technical issues

[0011] The present disclosure is designed to solve the above-mentioned problems, and thus the present disclosure aims to provide a battery pack for ensuring safety and reliability when a thermal event occurs in a battery module, and a vehicle including the battery pack.

[0012] However, the technical problems to be solved by the present disclosure are not limited to the above-mentioned problems, and those skilled in the art will clearly understand these and other problems from the following description.

[0013] Technical Solution

[0014] In order to solve the above-mentioned problems, a battery pack is provided, which includes: a plurality of battery modules; a battery pack tray, which accommodates the battery modules and has an open top; a battery pack cover, which is arranged on the top of the battery pack tray to hermetically seal a storage space in which the battery modules are accommodated; and a power disconnect portion, which is arranged between the battery pack tray and the battery pack cover to energize and support module connection bus bars connecting the battery modules, and when a thermal event occurs, the power disconnect portion separates the connection of the module connection bus bars to disconnect the electrical connection between the battery modules.

[0015] The power-on disconnect portion may include: a disconnect body, to which a pair of module connection bus bars are connected; a disengagement member, which is placed in the inner wall of the battery pack cover and disengages when the temperature of the battery pack cover rises; a first elastic member, one end of which is connected to the disengagement member and the other end of which is connected to the top of the disconnect body; and a second elastic member, one end of which is connected to the battery pack tray and the other end of which is connected to the bottom of the disconnect body.

[0016] The disconnect body may be located at a balance height in the accommodation space at which elastic forces of the first elastic member and the second elastic member are balanced with each other, and at the balance height, the module connection bus bar may energize the battery modules with each other.

[0017] When the temperature of the battery cover increases, the separation member may melt and separate from the battery cover.

[0018] When the detaching member is separated from the battery pack cover, as the disconnection body moves due to the elastic force of the second elastic member, the electrical connection between the battery modules may be disconnected.

[0019] The battery pack tray may have a horizontal partition wall and a vertical partition wall partitioning the inside of the battery pack tray, and the horizontal partition wall and the vertical partition wall may have an inner concave groove portion to which one end of the second elastic member is coupled.

[0020] The disengagement member may be made of a plastic material.

[0021] The disconnect body may be thicker than the module connecting bus bars.

[0022] The disconnect body may have connecting groove portions at both sides.

[0023] An inner wall of the battery pack cover may have a receiving groove in which the escape member is received.

[0024] The disconnect body may have, in each of the upper surface and the lower surface, a concave groove portion rounded inwardly in the thickness direction.

[0025] The inner wall of the connecting groove portion may have a tapered section such that the inner diameter increases from the center toward both ends of the disconnecting body.

[0026] According to another aspect of the present disclosure, a vehicle including a battery pack is provided herein.

[0027] Beneficial Effects

[0028] According to one aspect of the present disclosure, when a thermal event occurs due to a fire in any battery module, the electrical connections between other adjacent battery cells can be disconnected to prevent internal short circuits of normal battery modules and prevent heat propagation that causes the fire to spread to all battery packs, thereby enhancing safety.

[0029] In addition, it is possible to prevent fire from spreading between battery modules, thereby enhancing the durability of the battery pack and reducing maintenance and repair costs.

[0030] In addition, with a simpler configuration design, in the event of a fire in a battery pack, electrical short circuits between battery modules can be prevented and explosive fires can be prevented from spreading across battery modules, thereby regulating explosive heat energy accumulation in the battery pack and preventing structural collapse of the battery pack.

[0031] The effects of the present disclosure are not limited to the above-described effects, and those skilled in the art will clearly understand these and other effects based on the present disclosure and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the following detailed description, serve to provide a further understanding of the technical aspects of the present disclosure, and thus the present disclosure should not be construed as being limited to the accompanying drawings.

[0033] Figure 1 is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0034] Figure 2 yes Figure 1 An exploded perspective view of the main components of a battery pack.

[0035] Figure 3 The battery cover is removed Figure 1 Top view of the .

[0036] Figure 4 It is taken along line AA Figure 3 Vertical cross-section of .

[0037] Figure 5 is a schematic perspective view of a powered disconnect portion including a disconnect body and module connection bus bars coupled to both sides according to an embodiment of the present disclosure.

[0038] Figure 6 It is cut along the length direction Figure 5 Vertical cross-section of .

[0039] Figure 7 2 is a diagram illustrating separation of a disengagement member in a power-on disconnect portion of a battery pack according to an embodiment of the present disclosure.

[0040] Figure 8 is a diagram showing a disconnect body separated from a module connection bus bar in a power-on disconnect portion of a battery pack according to an embodiment of the present disclosure.

[0041] Fig. 9 is a schematic perspective view of a disconnect body according to another embodiment of the present disclosure.

[0042] Fig.10 yes Fig. 9 Vertical cross-section of .

[0043] Fig.11 is a diagram illustrating a disconnection body separated from a module connection bus bar according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms or words used in the present disclosure and the appended claims should not be interpreted as limited to the general and dictionary meanings, but on the basis of the principle that the inventor is allowed to appropriately define the terms for the best interpretation, based on the meanings and concepts corresponding to the technical aspects of the present disclosure. Therefore, the embodiments described herein and the illustrations shown in the accompanying drawings are exemplary embodiments of the present disclosure for describing the technical aspects of the present disclosure, and are not intended to be limiting, so it should be understood that various other equivalents and modifications may be made to them when submitting this application.

[0045] Figure 1 is a schematic perspective view of a battery pack according to an embodiment of the present disclosure, and Figure 2 yes Figure 1 An exploded perspective view of the main components of a battery pack.

[0046] According to this embodiment, the battery pack 1 may include: a plurality of battery modules 10; a battery pack tray 100, which accommodates the battery modules 10 and has an open top; a battery pack cover 200, which is disposed on the top of the battery pack tray 100 to hermetically seal the accommodation space in which the battery modules 10 are accommodated; and a power disconnect portion 300, which is disposed between the battery pack tray 100 and the battery pack cover 200 to energize and support the module connection bus bar 310 connecting the battery modules 10, and when a thermal event occurs, the power disconnect portion separates the connection of the module connection bus bar 310 to disconnect the electrical connection between the battery modules 10.

[0047] The battery module 10 includes a cell assembly formed by stacking battery cells and a module housing accommodating the cell assembly. Here, the battery module 10 may have a plurality of upper electrodes 11 at both ends of the upper surface, and the upper electrodes 11 may be configured to electrically connect the battery module 10 to an adjacent battery module 10. In addition, a disconnect body 320 and a pair of module connection bus bars 310 may be connected between the upper electrodes 11 to establish an electrical connection between the battery modules 10.

[0048] The pack case includes: a pack tray 100 accommodating the battery module 10 ; and a pack cover 200 disposed on the top of the pack tray 100 .

[0049] The battery pack tray 100 is configured to protect the battery module 10 from external impact and may be made of a material having high mechanical strength. Figure 1 and Figure 2As shown, the battery pack tray 100 may have an accommodation space 220 in which at least one battery module 10 is accommodated, and may have an open top that may be coupled with the battery pack cover 200. Here, the accommodation space may also refer to a space between the battery pack cover 200 and the upper surface of the battery module 10 after the battery module 10 is accommodated in the battery pack tray 100.

[0050] The battery pack tray 100 has a horizontal partition wall 110 (Y-axis direction) and a vertical partition wall 120 (X-axis direction) that partition the interior of the battery pack tray 100. In addition, the height of the horizontal partition wall 110 and the vertical partition wall 120 is lower than the height of the battery module 10, and is at least lower than the height at which the upper electrode 11 is located (see Figure 4 ). This is to horizontally arrange the disconnection body 320 and the module connection bus bar 310 above the horizontal partition wall 110 and the vertical partition wall 120 and connect them to each other.

[0051] Although this embodiment shows that the battery pack tray 100 has a horizontal partition wall 110 along the Y-axis and a vertical partition wall 120 along the X-axis perpendicular to the horizontal partition wall 110 within the battery pack tray 100, and accommodates four battery modules 10, the scope of protection of the present disclosure is not limited to the number of horizontal partition walls 110 and vertical partition walls 120 shown in this embodiment or the number of battery modules 10 accommodated in the battery pack tray 100.

[0052] The horizontal partition wall 110 and the vertical partition wall 120 have an inner recessed groove portion 121. The inner recessed groove portion 121 is recessed along the thickness direction (-Z direction) of the battery pack tray 100, and one end of the second elastic member is coupled to the inner recessed groove portion 121. In addition, the inner recessed groove portion 121 may be configured to accommodate a portion of the second elastic member 350. Therefore, when the second elastic member 350 expands or contracts, a space for expansion may be provided.

[0053] Main reference Figure 3 , the horizontal partition wall 110 may have two inner concave groove portions 121 at a central portion of the battery pack tray 100 , and the vertical partition wall 120 may have one inner concave groove portion 121 at a lower end portion.

[0054] The pack cover 200 is disposed on the top of the pack tray 100 to hermetically seal the accommodation space 220 in which the battery modules 10 are accommodated. The pack cover 200 in this embodiment is configured to completely cover the four battery modules 10, and the pack cover 200 may be made of aluminum or SUS to ensure rigidity and high conductivity.

[0055] The battery pack cover 200 has a plurality of receiving grooves 210 in the lower surface. The detachment member 330 may be received in the receiving groove 210, and the detachment member 330 may include a plurality of detachment members 330 located in the lower surface of the battery pack cover 200 and aligned with the detachment member 330. Figure 3 The detaching member 330 may be connected to the receiving groove 210 by bolt connection, and thus may be firmly fixed to withstand external impact.

[0056] The pack cover 200 and the pack tray 100 may be coupled, for example, by bolt connection, welding, bonding, hook connection, or the like.

[0057] When a thermal event occurs due to a fire in any of the battery modules 10 , the energization disconnection portion 300 is configured to disconnect the electrical connection between adjacent battery cells, thereby preventing an internal short circuit of the normal battery module 10 .

[0058] Figure 3 The battery pack cover is removed. Figure 1 A top view of Figure 4 It is taken along line AA Figure 3 A vertical cross-section of Figure 5 is a schematic perspective view of an energized disconnect portion including a disconnect body and module connection bus bars coupled to both sides according to an embodiment of the present disclosure, and Figure 6 It is cut along the length direction Figure 5 Vertical cross-section of .

[0059] The power disconnect portion 300 may include: a disconnect body 320, to which a pair of module connection bus bars 310 are connected; a disengagement member 330, which is placed in the inner wall of the battery pack cover 200 and disengages when the temperature of the battery pack cover 200 increases; a first elastic member 340, one end of which is connected to the disengagement member 330, and the other end of which is connected to the top of the disconnect body 320; and a second elastic member 350, one end of which is connected to the battery pack tray 100, and the other end of which is connected to the bottom of the disconnect body 320.

[0060] The module connection bus bar 310 may have one end electrically connected to the upper electrode 11 of the battery module 10 and the other end as a free end floating in the accommodation space, and the other end may be connected and supported by the disconnect body 320 as described below. The disconnect body 320 and the module connection bus bar 310 electrically connect the battery module 10 to its adjacent battery module 10, and therefore, one power disconnect portion 300 may have two module connection bus bars 310, that is, a pair of module connection bus bars 310, each module connection bus bar connected to the upper electrode 11 of each of the two battery modules 10. Figure 3 As shown, this embodiment includes three energized disconnect portions 300 .

[0061] The disconnect body 320 is disposed in the center of the pair of module connection bus bars 310 and serves to connect the pair of module connection bus bars 310 to establish electrical connection between the module connection bus bars 310 and to support the other ends of the pair of module connection bus bars 310. Figure 5 and Figure 6 , the disconnect body 320 may be thicker than the module connection bus bar 310, and have a connection ring 324 in each of the upper and lower surfaces. In addition, the disconnect body 320 may have a connection groove portion 321 at both sides, and the module connection bus bar 310 may be inserted and connected to the connection groove portion 321. The disconnect body 320 may be made of a material having high conductivity and thus high electrical connection efficiency, and may be made of the same material as the module connection bus bar 310 (e.g., copper, etc.).

[0062] The disengagement member 330 is disposed above the disconnection body 320. The disengagement member 330 is placed in the inner wall of the battery pack cover 200, specifically, in the accommodating groove 210, and is disengaged when the temperature of the battery pack cover 200 increases. That is, when a fire is caused by any battery cell in the battery pack 1 or a thermal event occurs in the battery module 10, gas and flame are generated, thereby causing heat energy accumulation and an increase in the temperature of the battery pack cover 200, and when the temperature of the battery pack cover 200 is higher than a preset design temperature, a portion of the coupling portion between the disengagement member 330 and the battery pack cover 200 melts, and the disengagement member 330 is separated or separated from the battery pack cover 200. Therefore, the disengagement member 330 may be made of a plastic material, but may also be made of any other material having a lower melting point than the battery pack cover 200.

[0063] The first elastic member 340 and the second elastic member 350 are respectively disposed on the upper surface and the lower surface of the disconnect body 320. One end of the first elastic member 340 is connected to the detaching member 330, and the other end of the first elastic member 340 is connected to the top of the disconnect body 320, and one end of the second elastic member 350 is connected to the battery pack tray 100, and the other end of the second elastic member 350 is connected to the bottom of the disconnect body 320.

[0064] The disconnect body 320 may be located at a balanced height in the accommodation space where the elastic force of the first elastic member and the elastic force of the second elastic member 350 are balanced with each other, and at the balanced height, the module connection bus bar 310 may energize the battery modules 10 with each other. Figure 4 As shown, when a pair of module connection bus bars 310 are connected to the upper electrodes 11 of the battery module 10 , the elastic forces of the first elastic member and the second elastic member are adjusted to achieve a balanced height.

[0065] Therefore, when the detachment member 330 is separated from the pack cover 200 , as the disconnection body 320 moves by the elastic force of the second elastic member, the pair of module connection bus bars 310 may be separated and insulated from each other, thereby disconnecting the electrical connection between the battery modules 10 .

[0066] According to this exemplary configuration, when a thermal event occurs due to a fire in any battery module 10, the electrical connection between other adjacent battery cells can be disconnected, thereby preventing internal short circuits in the normal battery modules 10, thereby preventing heat propagation that causes the fire to spread to all battery packs 1 and helping to suppress heat propagation (TP).

[0067] In addition, the spread of fire between the battery modules 10 can be prevented, thereby enhancing the durability of the battery pack 1 and reducing maintenance and repair costs. In addition, with a simpler configuration design, in the event of a fire in the battery pack, electrical short circuits between the battery modules 10 can be prevented and explosive fires can be prevented from spreading across the battery modules 10, thereby regulating explosive heat energy accumulation in the battery pack 1 and preventing the structural collapse of the battery pack 1.

[0068] Figure 7 is a diagram showing separation of a disengagement member in a power-on disconnection portion of a battery pack according to an embodiment of the present disclosure, and Figure 8 is a diagram showing a disconnect body separated from a module connection bus bar in a power-on disconnect portion of a battery pack according to an embodiment of the present disclosure.

[0069] In the following, reference will be made to Figures 1 to 8 An exhaust process in which exhaust gas is easily discharged to the outside according to the present embodiment is described in detail.

[0070] First, in a normal state without a thermal problem, the power disconnection section 300 in the battery pack 1 does not operate. Figure 4 As shown, the disconnect body 320 is located at a balanced height in the accommodation space where the elastic force of the first elastic member and the elastic force of the second elastic member 350 are balanced with each other, and at the balanced height, the module connection bus bar 310 energizes the battery modules 10 with each other.

[0071] Subsequently, when any battery cell in the battery pack 1 causes a fire or a thermal event occurs in the battery module 10, gas and flames are generated and the internal pressure increases, resulting in the accumulation of thermal energy and the increase in temperature of the battery pack cover 200, and the battery pack cover 200 having high thermal conductivity is prone to propagate the temperature increase. In addition, when the propagation temperature is higher than the design temperature, a portion of the coupling portion between the detachment member 330 and the battery pack cover 200 melts, and the detachment member 330 is separated from the battery pack cover 200, as shown in FIG. Figure 7 shown. Figure 7 It is shown that the first elastic member loses its elastic force, and the second elastic member 350 retains its elastic force.

[0072] Subsequently, when the detaching member 330 is separated from the battery pack cover 200, the disconnecting body 320 moves downward by the elastic force of the second elastic member. That is, when the detaching member 330 is separated from the battery pack cover 200, as the disconnecting body 320 moves by the elastic force of the second elastic member, the electrical connection between the battery modules is disconnected.

[0073] In this case, the elastic recovery of the second elastic member 350 is greater than the coupling strength of the module connection bus bar 310 coupled to the connection groove portion 321 of the disconnect body 320, so the disconnect body 320 is detached from the module connection bus bar 310 and slidably moves downward. Figure 8 It is shown that the shape of the connection groove portion 321 is maintained, but when the disconnect body 320 is separated from the module connection bus bar 310 , the connection groove portion 321 may be partially damaged or deformed.

[0074] In addition, due to the inner recessed groove 121 in the vertical partition wall 120, when the second elastic member 350 contracts, the second elastic member 350 is completely accommodated in the inner recessed groove 121, and when the disconnect body 320 moves downward, the disconnect body 320 almost sits on the upper surface of the vertical partition wall 120, thereby completely disconnecting or insulating the pair of module connecting bus bars 310.

[0075] Therefore, when a thermal event occurs due to a fire in any battery module 10, electrical connection between other adjacent battery cells can be prevented, thereby preventing an internal short circuit of the normal battery module 10 and preventing heat propagation that causes the fire to spread to all battery packs 1. In addition, fire propagation between battery modules 10 can be prevented, thereby enhancing the durability of the battery pack 1 and reducing maintenance and repair costs.

[0076] In addition, by utilizing a simpler configuration design, in the event of a fire in the battery pack, electrical short circuits between the battery modules 10 can be prevented and explosive fires can be prevented from spreading across the battery modules 10, thereby regulating the accumulation of explosive heat energy in the battery pack 1, thereby preventing structural collapse of the battery pack 1 and helping to suppress heat propagation (TP).

[0077] Then, refer to Figures 9 to 11 Other embodiments of the battery module 10 of the present disclosure are briefly described.

[0078] Fig. 9 is a schematic perspective view of a disconnected body according to another embodiment of the present disclosure, Fig.10 yes Fig. 9 A vertical cross-section of Fig.11 is a diagram illustrating a disconnection body separated from a module connection bus bar according to another embodiment of the present disclosure.

[0079] The same reference numerals as those in the aforementioned drawings denote the same elements, redundant description of the same elements is omitted, and the differences between this embodiment and the aforementioned embodiment will be described.

[0080] When compared with the above-described embodiment, a battery module 10 according to another embodiment of the present disclosure has an additional configuration in a disconnect body 320A.

[0081] The disconnect body 320A may have a concave groove portion 322 rounded inwardly along the thickness direction in each of the upper and lower surfaces. This is to reduce the thickness of the disconnect body 320A to cause more flexible deformation when the power-on disconnect portion 300A works, thereby easily separating the disconnect body 320A from the module connection bus bar 310A.

[0082] In addition, the inner wall of the connection groove portion 321 may have a tapered section 323 so that the inner diameter increases from the center toward both ends of the disconnect body 320A. The module connection bus bar 310A may have a tapered surface corresponding to the tapered section 323. Through the tapered section 323, the disconnect body 320A is separated from the module connection bus bar 310A and moves downward with less force than the first embodiment, which makes it easier to perform the electrical connection disconnection function. Fig.11 As shown, the disconnect body 320 is warped due to the concave groove portion 322 , and is easily separated from the module connection bus bar 310A due to the tapered section 323 .

[0083] Therefore, when a thermal event occurs due to a fire in any battery module 10, the electrical connection between the adjacent other battery cells can be disconnected, thereby preventing an internal short circuit of the normal battery module 10 and preventing heat propagation that causes the fire to spread to all battery packs 1. In addition, the propagation of fire between the battery modules 10 can be prevented, thereby enhancing the durability of the battery pack 1, reducing maintenance and repair costs, and helping to suppress heat propagation (TP).

[0084] In addition, using a simpler configuration design, in the event of a fire in the battery pack, electrical short circuits between battery modules 10 can be prevented and explosive fires can be prevented from spreading across battery modules 10, thereby regulating explosive heat energy accumulation in the battery pack 1 and preventing structural collapse of the battery pack 1.

[0085] Although not shown, the battery pack 1 according to the present disclosure may further include various types of devices to control charging / discharging of the battery module 10 , such as a battery management system (BMS), a current sensor, a fuse, and the like.

[0086] The battery pack 1 according to the present disclosure can be applied to vehicles such as electric vehicles or hybrid electric vehicles. That is, the vehicle according to the present disclosure can include the battery pack 1 according to the present disclosure. The battery pack 1 can be installed at the car frame under the car seat or the trunk space, and if necessary, placed in an inverted order when installed on the vehicle.

[0087] For convenience of description, terms indicating directions, such as up, down, left, right, front, and rear, are used, but it is obvious to those skilled in the art that these terms may change according to positions of the elements or observers.

[0088] Although the present disclosure has been described above with respect to a limited number of embodiments and drawings, the present disclosure is not limited thereto, and it is apparent to those skilled in the art that various changes and modifications may be made within the technical aspects of the present disclosure and the scope of the appended claims and their equivalents.

Claims

1. A battery pack, comprising: Multiple battery modules; a battery pack tray that receives the battery modules and has an open top; a battery pack cover disposed on a top of the battery pack tray to hermetically seal an accommodation space in which the battery module is accommodated; as well as An energized disconnect portion is disposed between the battery pack tray and the battery pack cover so as to be configured to energize and support module connection bus bars connecting the battery modules, and when a thermal event occurs, the energized disconnect portion separates the connection of the module connection bus bars to disconnect the electrical connection between the battery modules.

2. The battery pack according to claim 1, wherein: The power-on disconnecting unit further comprises: a disconnect body to which a pair of module connection bus bars are connected; a disengagement member disposed in an inner wall of the battery pack cover and disengaging when the thermal event occurs; a first elastic member, one end of which is connected to the detaching member and the other end of which is connected to the top of the disconnecting body; and A second elastic member, one end of the second elastic member is connected to the battery pack tray, and the other end of the second elastic member is connected to the bottom of the disconnect body.

3. The battery pack according to claim 2, wherein: The disconnecting body is located at a balance height in the accommodation space at which the elastic force of the first elastic member and the elastic force of the second elastic member are balanced with each other, and Wherein, at the equilibrium height, the module connecting bus bars enable the battery modules to be electrically connected to each other.

4. The battery pack according to claim 3, wherein: When the temperature of the pack cover increases, the separation member melts and separates from the pack cover.

5. The battery pack according to claim 3, wherein: When the detachment member is separated from the pack cover, as the second elastic member is compressed and the disconnection body moves, the electrical connection between the battery modules is disconnected.

6. The battery pack according to claim 2, wherein: The battery pack tray has a horizontal partition wall and a vertical partition wall that partition the interior of the battery pack tray, and The horizontal partition wall and the vertical partition wall have inner concave groove portions, and one end of the second elastic member is coupled to the inner concave groove portions.

7. The battery pack according to claim 2, wherein: The disengagement member is made of plastic material.

8. The battery pack according to claim 2, wherein: The disconnect body is thicker than the module connection bus bar.

9. The battery pack according to claim 8, wherein: The disconnect body has connecting grooves on both sides.

10. The battery pack according to claim 2, wherein: The inner wall of the battery pack cover has a receiving groove, and the separation member is received in the receiving groove.

11. The battery pack according to claim 9, wherein: The disconnect body has a concave groove portion rounded inwardly in a thickness direction in each of an upper surface and a lower surface.

12. The battery pack according to claim 11, wherein: The inner wall of the connecting groove portion has a tapered section such that the inner diameter increases from the center toward both ends of the disconnecting body.

13. A vehicle comprising the battery pack according to any one of claims 1 to 12.

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