Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a plurality of battery cells; an accommodating space for accommodating the plurality of battery cells is formed in the battery pack shell; the through hole penetrates through one surface of the battery pack shell; a case coupled to the one surface of the pack case; a partition panel that partitions the interior of the housing into a first space and a second space; an inflow hole penetrating through one surface of the housing forming the first space and communicating with the through hole; an outflow hole penetrating the other surface of the housing forming the first space so as to communicate the outside with the first space; a collection hole penetrating through the partition panel to communicate the first space and the second space; and a door rotatably coupled to the partition panel to open and close the collection hole.

Description

Technical Field

[0001] This disclosure relates to a battery pack. More specifically, it relates to a battery pack that can suppress flame exposure to the outside in the event of thermal runaway of the battery cell, thereby improving stability. Background Technology

[0002] If the positive and negative electrodes of a secondary battery (or cell) come into contact due to an internal short circuit, external impact, or other reasons, a rapid heating reaction occurs due to the instantaneous large current. This heating reaction causes the internal temperature of the cell to rise rapidly. This phenomenon is called thermal runaway. When thermal runaway occurs, the cell's casing (or outer material) may be opened, and the high-temperature fluid generated inside may be released.

[0003] The fluid may contain flammable gases and particles. These particles can act as ignition sources for the gases, and therefore, structures such as deflectors can be used to filter them from the fluid to suppress flames. However, after thermal runaway, the particle-filtering performance of the deflectors reaches a critical value over time. This is because the accumulated filtered particles lead to a simplified or straightened gas path. That is, flammable gases burn due to the high-temperature particles, exposing the flame to the outside. Therefore, it is necessary to separate the fluid's movement path and the space for trapping particles separated from the fluid. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] According to one aspect of this disclosure, the problem to be solved is to improve the stability of the battery pack even if thermal runaway occurs in the cell.

[0006] According to another aspect of this disclosure, the problem to be solved is to separate the space for fluid movement and the space for particle trapping when the battery cell experiences thermal runaway.

[0007] According to another aspect of this disclosure, the problem to be solved is to reduce the amount of particles contained in the fluid when the fluid generated by thermal runaway of the cell is released to the outside of the battery pack.

[0008] According to another aspect of this disclosure, the problem to be solved is to reduce or prevent flame exposure to the outside due to particles mixed in the fluid when the fluid generated by thermal runaway of the cell is released to the outside of the battery pack after a predetermined time.

[0009] According to another aspect of this disclosure, the problem to be solved is to minimize the deviation in the amount of particles separated from the fluid when the fluid generated by thermal runaway of the cell is released to the outside of the battery pack, depending on the position of the separator provided in the discharge section (or guide plate).

[0010] According to another aspect of this disclosure, the problem to be solved is to prevent particles mixed in the fluid generated by thermal runaway of the battery cell from accumulating on the discharge path and thus straightening the discharge path.

[0011] On the other hand, the battery pack disclosed herein can be widely used in electric vehicles, battery charging stations, and other green technology fields such as solar power generation and wind power generation that utilize batteries. Furthermore, the battery pack disclosed herein can be used in eco-friendly electric vehicles and hybrid vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0012] (II) Technical Solution

[0013] To address the aforementioned problems, the battery pack according to this disclosure may include: a plurality of battery cells; a battery pack housing forming a receiving space for accommodating the plurality of battery cells; a through-hole penetrating one side of the battery pack housing; a casing attached to the same side of the battery pack housing; a partition panel dividing the interior of the casing into a first space and a second space; an inflow hole penetrating one side of the casing forming the first space and communicating with the through-hole; an outflow hole penetrating the other side of the casing forming the first space to communicate with the outside and the first space; a trapping hole penetrating the partition panel to communicate with the first space and the second space; and a door rotatably attached to the partition panel to open and close the trapping hole.

[0014] Furthermore, one side of the housing and the other side of the housing may be opposite each other.

[0015] Additionally, the housing may include a first side and a second side, the first side and the second side forming two sides of the housing along the direction away from the side of the battery pack housing, the inlet hole may be close to either the first side or the second side, and the outlet hole may be close to the other side of the first side or the second side.

[0016] Additionally, the battery pack according to this disclosure may further include: a separator extending from one side of the housing and the other side of the housing to the other side, and spaced apart from the other side.

[0017] When a fluid containing particles, generated from one or more of the plurality of cells, flows through the inlet hole and moves toward the outlet hole, the partition can change the flow direction of the fluid containing the particles.

[0018] Multiple partitions may be provided, and the multiple partitions may include: a first partition protruding from the other side of the housing; and a second partition protruding from the side of the housing.

[0019] On the other hand, multiple partitions can be provided, and the trapping holes and doors can be respectively provided between the multiple partitions and between the multiple partitions and the outer shell.

[0020] The door can be rotated into the second space to open.

[0021] On the other hand, the battery pack according to this disclosure may further include a hinge portion for rotatably connecting the door to the partition panel, the hinge portion being located around the trap hole.

[0022] The door can be opened and closed according to the weight of particles separated from the fluid and deposited on the door in the first space, wherein the fluid is generated from more than one of the plurality of battery cells and contains the particles.

[0023] On the other hand, the battery pack according to this disclosure may further include: a hinge portion that rotatably connects the door to the partition panel, the hinge portion causing the door to tilt downward toward the second space in the opposite direction to the direction of fluid movement to open.

[0024] The battery pack according to this disclosure may further include: a protective cover, which is attached to the housing to cover the outflow hole.

[0025] When the pressure in the containment space reaches a predetermined allowable pressure, the protective cover can be separated from the outflow hole.

[0026] The materials of the protective cover and the outer shell can be different.

[0027] On the other hand, the volume of the first space can be greater than the volume of the second space.

[0028] On the other hand, the inflow hole may include a first inflow hole and a second inflow hole, the first inflow hole and the second inflow hole penetrating one side of the housing, and the outflow hole is located between the first inflow hole and the second inflow hole.

[0029] The battery pack according to this disclosure may include: a plurality of battery cells; a battery pack housing forming a receiving space for accommodating the plurality of battery cells; and a discharge portion connected to the battery pack housing, wherein the discharge portion includes a first space communicating with the receiving space and a second space separated from the first space by a partition panel, the first space and the second space being selectively connected by a door rotatably connected to the partition panel to open and close a collection hole penetrating the partition panel.

[0030] Multiple discharge sections can be provided.

[0031] The plurality of discharge portions may include a first discharge portion and a second discharge portion that are attached side by side to one side of the battery pack housing, and the inflow holes of the first discharge portion and the second discharge portion may be located between the outflow holes of the first discharge portion and the second discharge portion.

[0032] (III) Beneficial Effects

[0033] According to one embodiment of this disclosure, the stability of the battery pack can be improved even if thermal runaway occurs in the battery cell.

[0034] According to another embodiment of this disclosure, the space for fluid movement and the space for trapping particles can be separated when thermal runaway occurs in the battery cell.

[0035] According to another embodiment of this disclosure, when the fluid generated by thermal runaway of the battery cell is released to the outside of the battery pack, the amount of particles contained in the fluid can be reduced.

[0036] According to another embodiment of this disclosure, when the fluid generated by thermal runaway of the battery cell is released to the outside of the battery pack, after a predetermined time, the exposure of the flame to the outside due to particles mixed in the fluid can be reduced or prevented.

[0037] According to another embodiment of this disclosure, when the fluid generated by thermal runaway of the battery cell is released to the outside of the battery pack, the deviation in the amount of particles separated from the fluid can be minimized according to the position of the separator provided in the discharge section (or guide plate).

[0038] According to another embodiment of this disclosure, particles mixed in the fluid generated by thermal runaway of the battery cell can be prevented from accumulating on the discharge path, thereby straightening the discharge path and improving filtration performance. Attached Figure Description

[0039] Figure 1 An example of a battery pack according to this disclosure is shown.

[0040] Figure 2 An example of a battery pack according to this disclosure is shown as viewed from above.

[0041] Figure 3 A cross-section of the discharge section as viewed from above is shown.

[0042] Figure 4 A cross-section of the discharge section as viewed from the front is shown.

[0043] Figure 5 Another example of a battery pack according to this disclosure is shown.

[0044] Figure 6 Another example of a battery pack according to this disclosure is shown.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100: Battery cell; 200: Battery module

[0047] 310: Housing cover; 390: Battery pack casing

[0048] 330: Divider section; 500: Discharge section

[0049] 511: Outlet orifice; 513: Inlet orifice

[0050] 520: Partition 530: Door

[0051] 540: Divider panel; 1000: Battery pack Detailed Implementation

[0052] The present disclosure will now be described in detail with reference to the accompanying drawings. However, this is merely exemplary, and the present disclosure is not limited to the specific embodiments described herein. Furthermore, in this disclosure, "battery," "secondary battery," and "cell" all refer to a cell capable of being charged and discharged.

[0053] Figure 1 An example of a battery pack according to this disclosure is shown.

[0054] Reference Figure 1 The battery pack 1000 according to this disclosure may include: a plurality of battery cells 100; a battery pack housing 390 for accommodating the plurality of battery cells 100; and a discharge portion 500, which is attached to one side of the battery pack housing 390 to communicate with the interior of the battery pack housing 390.

[0055] The battery cell 100 may include: a main body 115, which includes an electrode assembly (not shown) for generating or storing electrical energy; and lead tabs 111 and 112, which are electrically connected to the electrode assembly and protrude outward from the main body 115.

[0056] Reference Figure 1The cell 100 is shown as a pouch cell, but the shape of the cell 100 is not limited to a pouch cell 100 in this specification. That is, the battery pack 1000 according to this disclosure may include prismatic or cylindrical cells 100.

[0057] Reference Figure 1 According to this disclosure, the battery pack 1000 can accommodate a plurality of battery cells 100 in the accommodating space 398. The plurality of battery cells 100 can be stacked along a predetermined stacking direction.

[0058] Figure 1 An example of multiple cells 100 stacked along the Y direction is shown, but the multiple cells 100 may also be stacked along other directions.

[0059] The battery pack housing 390 may include a receiving cover 310 and a receiving body 395, the receiving cover 310 and the receiving body 395 together forming the receiving space 398. (Refer to...) Figure 1 One side of the receiving body 395 may be open. The receiving cover 310 may be attached to the receiving body 395 to cover the open side.

[0060] Additionally, the battery pack housing 390 may include a partition 330 for dividing the receiving space 398 into a plurality of subspaces 398a to 398d (see reference). Figure 2 The partition 330 may include a first frame 331 extending in the Y direction and a second frame 335 extending in the X direction within the accommodating space.

[0061] That is, the partition 330 can divide the accommodating space 398 into a plurality of subspaces 398a to 398d along two directions perpendicular to the height direction of the battery pack housing 390 and mutually perpendicular to each other.

[0062] Figure 1 An example is shown where multiple battery cells 100 are grouped in a predetermined number and arranged in two columns along the Y direction. Alternatively, the multiple battery cells 100 can be arranged in two rows along the X direction. This is merely an example; the number of the multiple subspaces 398a to 398d can be varied, and the number of rows and columns can be varied accordingly.

[0063] The battery pack housing 390 may include: a bottom surface supporting the plurality of battery cells 100; and battery pack sides 391, 392, 396, 397 extending from each edge of the bottom surface toward the receiving cover 310 to form the sides of the battery pack housing 390.

[0064] In this specification, one side of the battery pack housing 390 may refer to any one of the side surface of the battery pack, the bottom surface, and the receiving cover 310.

[0065] On the other hand, the front F and rear R are defined in this specification only for ease of explanation and understanding. Therefore, the front and rear of the battery pack 1000 according to this disclosure are not limited to the front and rear shown in the figure.

[0066] The battery pack 1000 according to this disclosure may include a discharge section 500, which is communicatively coupled to the battery pack housing 390.

[0067] The discharge section 500 may include: a housing 510 (see reference) Figure 3 ), forming the shape of the discharge section; inlet hole 513 (refer to Figure 3 ), and formed through one side of the outer casing 510; and an outlet hole 511 (see reference) Figure 3 It is formed by penetrating the other side of the outer shell 510.

[0068] Additionally, the discharge portion 500 may further include a protective cover 515, which is attached to the housing 510 to cover the outflow hole 511.

[0069] When the pressure in the containment space 398 reaches a predetermined allowable pressure, the protective cover 515 can be separated from the outlet hole 511.

[0070] If the positive and negative electrodes inside the battery cell 100 accidentally come into contact with each other, the temperature inside the battery cell 100 will rise rapidly, resulting in thermal runaway. This may cause the battery cell 100 to expand, causing the casing of the battery cell 100 to open or tear, thereby releasing the internal fluids and flames into the containment space 398.

[0071] In this specification, "fluid" refers to the concept of gases generated directly or indirectly due to thermal runaway of the battery cell, as well as liquid and colloidal substances mixed in said gases. Additionally, the fluid may also include particles in solid form formed due to high temperatures. Unless specifically excluded, "fluid" or "fluid containing particles" indicates the presence of particles within the fluid. Therefore, particles may also move along with the direction of fluid movement.

[0072] When thermal runaway of cell 100 begins to propagate to adjacent cells 100, the temperature and pressure of the containment space 398 will rise. For user safety, it is necessary to quickly drain the fluid in the containment space 398 caused by thermal runaway to the outside. To this end, the protective cover 515 can tear or rupture when the pressure in the containment space 398 exceeds a permissible pressure. That is, the protective cover 515 can detach from the outer casing 510 when the permissible pressure exceeds the permissible pressure, thereby connecting the outside and the containment space 398 through the discharge section 500. Therefore, the fluid in the containment space 398 can be discharged to the outside through the discharge section 500.

[0073] To allow the protective cover 515 to detach from the housing 510 when the allowable pressure is exceeded, the materials of the protective cover 515 and the housing 510 may be different. As an example, the protective cover 515 may be made of a polymer material, while the housing 510 may be made of a metal material.

[0074] Figure 2 An example of a battery pack according to this disclosure is shown as viewed from above.

[0075] Reference Figure 2 The plurality of battery cells 100 can be divided and housed in the plurality of subspaces 398a to 398d. (Refer to...) Figure 2 The battery pack 1000 may include sub-covers 315 that respectively cover the subspaces 398a to 398d.

[0076] The sub-cover 315 may further include a plurality of sub-cover through holes 315a extending through the sub-cover 315.

[0077] On the other hand, the battery pack housing 390 may include a through hole 380 extending through one side of the battery pack housing 390.

[0078] Reference Figure 2 Multiple through holes 380 may be provided on one side of the battery pack housing 390. The multiple through holes 381 to 384 are used to quickly discharge fluid filled in the receiving space 398 to the outside.

[0079] The plurality of through holes 381 to 384 can each be located in one of the subspaces 398a to 398d. This is to ensure that fluid can be effectively discharged regardless of the position of the subspaces 398a to 398d.

[0080] However, this is just an example, and the number of vias 380 can vary depending on the number of subspaces 398a to 398d.

[0081] Reference Figure 2The fluid generated in any one of the cells 100 can move along the X direction toward the sides 396 and 397 of the battery pack. Since the center of the battery pack 1000 is provided with a busbar that electrically connects the multiple cells 100 to the outside, the space through which the fluid can pass may be relatively small.

[0082] That is, the fluid generated in any one of the cells 100 can move along the X direction and move to the battery pack side 396 or 397 of the battery pack 1000, and then move along a direction parallel to the battery pack side 396 or 397 to the discharge part 500 or other battery pack side 391 or 392 located on the front and rear sides of the battery pack 1000.

[0083] In the battery pack side 396 or 397, the fluid can move through the empty space between the battery pack side 396 or 397 and the plurality of battery cells 100. In contrast, the battery pack 1000 may further include a tunnel-shaped frame (not shown) to allow the fluid to move inward along the battery pack side 396 or 397.

[0084] Fluid reaching the vicinity of the discharge section 500 in the receiving space 398 can flow into the discharge section 500 through the through hole 380 and the inflow hole 513 connected to the through hole 380.

[0085] As described above, the fluid may contain particles. The discharge section 500 can separate or filter the particles from the fluid to reduce the amount of particles contained in the fluid, and then discharge the fluid to the outside through the outlet hole 511.

[0086] Figure 3 A cross-section of the discharge section as viewed from above is shown. Figure 4 A cross-section of the discharge section as viewed from the front is shown.

[0087] Reference Figure 3 and Figure 4 The discharge section 500 includes: a housing 510, attached to one side of the battery pack housing 390; a partition panel 540, dividing the interior of the housing 510 into a first space S1 and a second space S2; an inlet 513, penetrating one side of the housing 510 forming the first space S1 and communicating with the through hole 380; an outlet 511, penetrating the other side of the housing 510 forming the first space S1 to communicate with the outside and the first space S1; a trapping hole 538, penetrating the partition panel 540 to communicate with the first space S1 and the second space S2; and a door 530, rotatably attached to the partition panel 540 to open and close the trapping hole 538.

[0088] The housing 510 can form the shape of the discharge portion 500. The housing 510 may include a contact surface 518, which is one side of the housing 510 that is attached to the battery pack housing 390; and an opposing surface 516, which is another side of the housing 510 that is opposite to the contact surface 518.

[0089] The contact surface 518 may include an inflow hole 513 connected to the through hole 380. When the housing 510 is combined with the battery pack housing 390, the through hole 380 and the inflow hole 513 may be connected at the same position to connect the receiving space 398 and the first space S1.

[0090] The opposing surface 516 may include an outflow hole 511 that connects the first space S1 and the outside.

[0091] Reference Figure 3 The opposing surface 516 may be closer to the front F of the battery pack 1000 than the contact surface 518, and the opposing surface 516 may be closer to the rear R of the battery pack 1000 than the contact surface 518. At least a portion of the contact surface 518 may be closer to one side of the battery pack housing 390 than the opposing surface 516.

[0092] The housing 510 may include a first side 519 and a second side 517, wherein the first side 519 and the second side 517 are connected to the contact surface 518 and the opposing surface 516 along a direction away from the side of the battery pack housing 390.

[0093] The housing 510 may include a partition panel 540 extending along one side of the battery pack housing 390 to divide the interior of the housing 510 into the first space S1 and the second space S2.

[0094] Reference Figure 4 The partition panel 540 may be located inside the housing 510 to form the bottom surface of the first space S1 and the top surface of the second space S2.

[0095] Reference Figure 3 and Figure 4 The first space S1 can communicate with the receiving space 398 and the outside through the inlet hole 513 and the outlet hole 511. Thus, the first space S1 allows fluid (including particles) generated in any of the battery cells 100 due to thermal runaway to move from the receiving space 398 to the first space S1 through the through hole 380 and the inlet hole 513 connected to the through hole 380. The fluid can then be discharged from the first space S1 to the outside through the outlet hole 511.

[0096] The second space S2 can be a space for capturing particles that separate due to their own weight as the fluid moves through the first space S1. The second space S2 can be selectively connected to the first space S1 through the partition panel 540.

[0097] The inlet 513 may be included on one side of the housing 510. As an example, refer to... Figure 3 The inflow hole 513 may be located on the contact surface 518. Alternatively, the inflow hole 513 may be located near either the first side surface 519 or the second side surface 517.

[0098] The outlet 511 may be included on another side of the housing 510. As an example, refer to... Figure 3 The outlet hole 511 may be located on the opposite surface 516. Furthermore, the outlet hole 511 may be located near the other side of the first side surface 519 and the second side surface 517.

[0099] Preferably, the inlet hole 513 and the outlet hole 511 are spaced as far apart as possible. This is to maximize the separation or filtration of particles from the fluid during passage through the first space S1.

[0100] Reference Figure 4 The height H2 of the inlet hole 513 and the height H3 of the outlet hole 511 can be different. This is because the amount of particles and the temperature of the fluid flowing in through the inlet hole 513 are different from the amount of particles and the temperature of the fluid flowing out through the outlet hole 511.

[0101] On the other hand, refer to Figure 4 The volume of the first space S1 can be larger than the volume of the second space S2. This is because the first space S1 serves as a channel for fluid movement, while the second space S2 is a space for capturing and storing solid particles.

[0102] Therefore, refer to Figure 4 The height H3 of the inlet hole 513 and the height H2 of the outlet hole 511 can be greater than or equal to half the height H1 of the outer shell 510.

[0103] On the other hand, refer to Figure 3 The discharge section 500 may further include a partition 520, which extends from one side of the housing 510 and the other side of the housing 510 to the other side, and the extended end is spaced apart from the other side.

[0104] The length of the partition 520 may be less than the distance from the first surface of the housing 510 to the other surface of the housing 510, and may be greater than or equal to half the distance from one surface of the housing 510 to the other surface of the housing 510.

[0105] As an example, refer to Figure 3 The protruding length of the partition 520 can be less than the distance L1 between the contact surface 518 and the opposite surface 516, and can be greater than or equal to half of the distance L2 between the contact surface 518 and the opposite surface 516.

[0106] The partition 520 is used to extend the distance the fluid travels in the first space S1 by changing the direction of fluid movement. This ensures sufficient time for separating particles from the fluid.

[0107] That is, the fluid flowing in through the inlet hole 513 can flow through the baffle 520 in a zigzag pattern towards the outlet hole 511, instead of flowing diagonally towards the outlet hole 511. As the fluid moves in a zigzag pattern through the baffle 520, particles contained in the fluid and moving together will fall onto the partition panel 540 due to their own weight. That is, the particles can accumulate on the partition panel 540.

[0108] On the other hand, multiple baffles 520 may be provided. This is to extend the travel distance of the fluid. The multiple baffles 520 may include: a first baffle 521 protruding from the other side of the housing 510; and a second baffle 522 protruding from the other side of the housing 510.

[0109] Additionally, multiple baffles 520 may be arranged side by side. However, this is just an example; the multiple baffles 520 do not necessarily need to be arranged side by side, as long as the multiple baffles 520 can ensure the time required to separate particles from the fluid.

[0110] The first partition 521 can be formed by protruding from the opposite surface 516 toward the contact surface 518, and the second partition 522 can be formed by protruding from the contact surface 518 toward the opposite surface.

[0111] Figure 3 A discharge section 500 consisting of two first partitions 521, 523 and one second partition 522 is shown, but the number of the plurality of partitions 520 can be varied.

[0112] The fluid flowing in through the inlet hole 513 flows toward the opposite surface 516. Then, the fluid changing direction at the opposite surface 516 moves along the first partition 521 toward the contact surface 518. Afterward, the fluid moves through the gap between the end of the first partition 521 and the contact surface 518, and then moves along the aforementioned zigzag movement path toward the outlet hole 511.

[0113] The first space S1 can be divided into multiple partitioned spaces S11 to S14 by the first side 519, the second side 517 and the multiple partitions 520.

[0114] That is, the plurality of partition spaces S11 to S14 can be formed between the plurality of partitions 520 or between the plurality of partitions 520 and the outer shell 510.

[0115] As an example, Figure 3 The diagram shows four partitioned spaces S11 to S14, which are divided by three partitions 521, 522, 523, a first side 519, and a second side 517.

[0116] On the other hand, refer to Figure 3 and Figure 4 The discharge section 500 may include: a collection hole 538 extending through the partition panel 540; and a door 530 rotatably coupled to the partition panel 540 to open and close the collection hole 538.

[0117] The first space S1 and the second space S2 can be interconnected through the collection hole 538. If the first space S1 and the second space S2 are always connected, the flow of the fluid may generate unnecessary secondary flows. Therefore, it is necessary to keep the second space S2 closed under normal circumstances and open it through the collection hole 538 only when necessary.

[0118] For this purpose, the discharge section 500 may include a door 530 rotatably coupled to the partition panel 540 to open and close the collection hole 538.

[0119] Reference Figure 4 The door 530 can be rotated toward the second space S2 to open.

[0120] The door 530 can be opened and closed according to the weight of particles separated from the fluid and deposited on the door 530 in the first space S1, wherein the fluid is generated from one or more of the plurality of cells 100 and contains the particles.

[0121] That is, when the weight of the particles accumulated on the door 530 reaches a predetermined rotational weight or more, the door 530 can rotate toward the second space S2 to open the trapping hole 538.

[0122] Therefore, the door 530 may further include a hinge portion 535 located around the collection hole 538, rotatably connecting the door 530 to the partition panel 540. Alternatively, the hinge portion 535 may be located around the water collection hole 538.

[0123] The hinge portion 535 can cause the door 530 to tilt downward toward the second space S2 in the opposite direction to the direction of fluid movement to open.

[0124] This is because if the door 530 is tilted downward toward the second space S2 in the direction of fluid movement, the door 530 can be opened by the movement of the fluid.

[0125] Therefore, if the trapping hole 538 is quadrilateral in shape, the hinge portion 535 can be located around the trapping hole 538 in a direction perpendicular to the direction from the first side 519 to the second side 517.

[0126] Around the trapping hole 538, the hinge axis 536 of the hinge portion 535 can be arranged parallel to the partition 520.

[0127] Following thermal runaway in any of the cells 100, the amount of particles separated as the fluid passes through the first space S1 increases over time. Therefore, after a predetermined critical time, the fluid's path becomes narrower and straighter due to the accumulated particles, causing particles to remain unseparated and discharge with the fluid through the outflow orifice 511. To address these issues, the battery pack 1000 according to this disclosure separates the space for fluid movement from the trapping space for capturing particles separated from the fluid.

[0128] When the weight of the particles accumulated on the door 530 exceeds the rotational weight, the door 530 rotates toward the second space S2 to open the second space S2. The particles accumulated on the door 530 can move along the door 530 to the second space S2 and be captured. When the particles accumulated on the door 530 have moved to the second space S2, the door 530 can rotate again to close the capture hole 538. For this purpose, the door 530 may further include a resilient member (not shown) connected to the hinge axis 536.

[0129] On the other hand, the discharge section 500 may include a plurality of trapping holes 538 extending through the partition panel 540. The plurality of trapping holes 538 may be located at the lower part of each of the partition spaces S11 to S14. In addition, the discharge section 500 may include a plurality of doors 530, which open and close the plurality of trapping holes 538 respectively.

[0130] That is, the plurality of trapping holes 538 and the door 530 can be respectively provided between the plurality of partitions 520 and between the plurality of partitions 520 and the outer shell 510.

[0131] Reference Figures 1 to 4 According to the present disclosure, the battery pack 1000 may include: a plurality of battery cells 100; a battery pack housing 390 forming a receiving space 398 for accommodating the plurality of battery cells 100; and a discharge portion 500, which is attached to the battery pack housing 390, and the discharge portion 500 includes a first space S1 communicating with the receiving space 398 and a second space S2 separated from the first space S1 by a partition panel 540.

[0132] The first space S1 and the second space S2 can be selectively connected by a door 530, which is rotatably coupled to the partition panel to open and close the trapping hole 538 through the partition panel 540.

[0133] Additionally, refer to Figure 2 and Figure 4 Multiple discharge sections 500 may be provided. The battery pack housing 390 may include through holes 381 to 384 connected to the inflow holes 513 of each discharge section.

[0134] Reference Figure 2 and Figure 4 The battery pack 1000 may include a first through hole 381 and a second through hole 382, ​​the first through hole 381 and the second through hole 382 penetrating one side of the battery pack housing 390.

[0135] In addition, the plurality of discharge sections 500 may each include a first discharge section 501 communicating with the receiving space 398 through the first through hole 381 and a second discharge section 502 communicating with the receiving space 398 through the second through hole 382.

[0136] Considering the direction of fluid movement, the inflow holes 513 of the first discharge section 501 and the second discharge section 502 can be located between the outflow holes 511 of the first discharge section 501 and the second discharge section 502.

[0137] The battery pack 1000 may include a third through hole 383 and a fourth through hole 384, which penetrate the other side of the battery pack housing 390 facing the side of the battery pack housing 390. Additionally, the plurality of discharge portions 500 may each include a third discharge portion 503 communicating with the receiving space 398 through the third through hole 383 and a fourth discharge portion 504 communicating with the receiving space 398 through the fourth through hole 384.

[0138] The functions and structures of the third discharge section 503 and the fourth discharge section 504 are the same as those of the first discharge section 501 and the second discharge section 502, therefore detailed descriptions are omitted.

[0139] Figure 5 Another example of a battery pack according to this disclosure is shown.

[0140] Reference Figure 5 According to another example of this disclosure, the battery pack 1000 includes a battery module 200, which includes battery cells 100 grouped in a predetermined number, and the battery module 200 can be accommodated in the accommodating space 398. The accommodating space 398 can be divided into a plurality of subspaces by the partition 330.

[0141] Similarly, the battery pack 1000 according to another example of this disclosure may include: a battery pack housing 390, including a receiving cover 310 (see reference 390). Figure 1 The battery pack housing 390 includes a housing 395 and a discharge portion 500, which are communicatively connected to the battery pack housing 390.

[0142] Figure 6 Another example of a battery pack according to this disclosure is shown.

[0143] and Figure 2 different, Figure 6 An example is shown where a plurality of through holes 380 formed on one side of the battery pack housing 390 are connected to a discharge portion 500.

[0144] Therefore, the inlet hole 513 may include a first inlet hole 5131 and a second inlet hole 5132, the first inlet hole 5131 and the second inlet hole 5132 penetrating one side of the housing 510, and the outlet hole 511 may be located between the first inlet hole 5131 and the second inlet hole 5132.

[0145] Due to the pressure difference between the containing space 398, the first space S1 and the outside, the amount of fluid flowing in through the first inlet hole 5131 and discharged through the second inlet hole 5132 instead of the outlet hole 511 is negligible.

[0146] The above description is merely an example of applying the principles of this disclosure, and other configurations may be included without departing from the scope of this utility model.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells; The battery pack housing forms a receiving space for accommodating the plurality of battery cells; A through hole extends through one side of the battery pack casing; The outer casing is attached to one side of the battery pack housing; A partition panel divides the interior of the outer casing into a first space and a second space; An inflow hole penetrates one side of the outer shell forming the first space and communicates with the through hole; An outflow hole extends through the other side of the outer shell forming the first space to connect the outside and the first space; A trap hole extends through the partition panel to connect the first space and the second space; as well as The door is rotatably attached to the partition panel to open and close the trap hole.

2. The battery pack according to claim 1, characterized in that, One side of the housing and the other side of the housing are opposite each other.

3. The battery pack according to claim 1, characterized in that, The housing includes a first side and a second side, the first side and the second side forming two sides of the housing along a direction away from the side of the battery pack housing. The inlet hole is located near either the first side or the second side. The outlet hole is located near the other side of the first side and the second side.

4. The battery pack according to any one of claims 1 to 3, characterized in that, Further includes: A partition extends from one side of the housing and the other side of the housing to the other side, and is spaced apart from the other side.

5. The battery pack according to claim 4, characterized in that, Multiple partitions are provided. The plurality of said partitions include: A first partition protrudes from the other side of the housing; and The second partition protrudes from one side of the outer casing.

6. The battery pack according to claim 4, characterized in that, Multiple partitions are provided. The trapping holes and the doors are respectively provided between the multiple partitions and between the multiple partitions and the outer shell.

7. The battery pack according to claim 1, characterized in that, The door rotates toward the second space to open.

8. The battery pack according to claim 1 or 7, characterized in that, Further includes: A hinge portion rotatably connects the door to the partition panel. The hinge portion is located around the trapping hole.

9. The battery pack according to claim 1, characterized in that, The door opens and closes according to the weight of particles that separate from the fluid in the first space and accumulate on the door, wherein the fluid is generated from more than one of the plurality of battery cells and contains the particles.

10. The battery pack according to claim 9, characterized in that, Further includes: A hinge portion rotatably connects the door to the partition panel. The hinge causes the door to tilt downward toward the second space in the opposite direction to the direction of fluid movement in order to open.

11. The battery pack according to claim 1, characterized in that, Further includes: A protective cap is attached to the outer casing to cover the outflow hole.

12. The battery pack according to claim 11, characterized in that, When the pressure in the containment space reaches a predetermined allowable pressure, the protective cover separates from the outlet hole.

13. The battery pack according to claim 11 or 12, characterized in that, The protective cover is made of a different material than the outer shell.

14. The battery pack according to claim 1, characterized in that, The volume of the first space is greater than the volume of the second space.

15. The battery pack according to claim 1, characterized in that, The inflow hole includes a first inflow hole and a second inflow hole, the first inflow hole and the second inflow hole penetrating one side of the housing, and the outflow hole is located between the first inflow hole and the second inflow hole.

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