Battery unit, battery cell assembly comprising same, and battery pack comprising same

Abstract

Provided is a battery unit comprising: a U-shaped barrier sheet including a first portion and second and third portions spaced apart from each other with the first portion therebetween; battery cells which are accommodated in the barrier sheet and are arranged in a first direction; and a gap filler pad between the first portion and the battery cells.

Description

Battery unit, battery cell assembly including the same, and battery pack including the same

[0001] The present disclosure relates to a battery unit, a battery cell assembly including the same, and a battery pack including the same.

[0002] More specifically, the present disclosure relates to a battery unit, a battery cell assembly, and a battery pack with a bottom venting and top cooling concept.

[0003] The present disclosure claims the benefit of priority based on Korean Patent Application No. 10-2025-0006448 filed January 16, 2025, and all contents of Korean Patent Application No. 10-2025-0006448 are incorporated by reference into the present disclosure.

[0004]

[0005] Rechargeable batteries can be used repeatedly for extended periods through recharging. They are used in various fields, including mobility, portable electronic devices, and Energy Storage Systems (ESS). In particular, the demand for rechargeable batteries for mobility is increasing further in order to reduce dependence on fossil fuels and decrease carbon emissions.

[0006] However, concerns regarding the safety of secondary batteries for mobility remain a significant challenge that needs to be addressed. If a fire occurs in a battery pack mounted on a mobility device, it can pose a serious threat to human lives.

[0007]

[0008] The problem that the present disclosure aims to solve is to provide a battery unit, a battery cell assembly, and a battery pack with enhanced safety.

[0009]

[0010] Exemplary embodiments of the present disclosure capable of solving the above problems are as follows.

[0011]

[0012] A battery unit according to exemplary embodiments is:

[0013] A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between;

[0014] Battery cells accommodated in the barrier sheet and arranged in a first direction; and

[0015] Gap filler pad between the first part and the battery cells;

[0016] It may include.

[0017]

[0018] In exemplary embodiments, the second part may be in contact with the battery cell furthest forward in the first direction among the battery cells, and the third part may be in contact with the battery cell furthest rear in the first direction among the battery cells.

[0019] In exemplary embodiments, the gap filler pad may comprise one or more of ceramic, silicon, and mica.

[0020] In exemplary embodiments, the barrier sheet may comprise one or more of ceramic, silicon, and mica.

[0021] In exemplary embodiments, the battery cells may be connected in parallel with each other.

[0022]

[0023] A battery cell assembly according to exemplary embodiments includes battery units and barrier pads, and

[0024] Each of the above battery units is:

[0025] A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between;

[0026] Battery cells accommodated in the barrier sheet and arranged in a first direction; and

[0027] Gap filler pad between the first part and the battery cells;

[0028] Includes,

[0029] The above battery units and the above barrier pads can be arranged alternately.

[0030]

[0031] In exemplary embodiments, each of the barrier pads may come into contact with at least one of the second and third parts.

[0032] In exemplary embodiments, each of the barrier pads may comprise one or more of ceramic, silicon, and mica.

[0033]

[0034] A battery pack according to exemplary embodiments is:

[0035] Venting plate including first vent holes;

[0036] Battery cell assemblies on the above-mentioned venting plate; and

[0037] Heat sinks on the above battery cell assemblies;

[0038] Includes,

[0039] Each of the above battery cell assemblies includes battery units and barrier pads arranged alternately with one another, and

[0040] Each of the above battery units is:

[0041] A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between;

[0042] Battery cells accommodated in the barrier sheet and arranged in a first direction; and

[0043] Gap filler pad between the first part and the battery cells;

[0044] It may include.

[0045]

[0046] In exemplary embodiments, each of the battery cell assemblies includes a bottom plate between the venting plate and the battery units, and the bottom plate may include second vent holes.

[0047] In exemplary embodiments, the second vent holes and the first vent holes may overlap in a second direction perpendicular to the venting plate.

[0048] In exemplary embodiments, the battery units may come into contact with the venting plate.

[0049] A battery pack according to exemplary embodiments further includes a base plate under the venting plate, and the base plate may be spaced apart from the venting plate.

[0050] A battery pack according to exemplary embodiments may further include a venting channel having a corrugated structure located between the venting plate and the base plate.

[0051] In exemplary embodiments, the venting channel includes third vent holes, and the third vent holes and the first vent holes may overlap in a second direction perpendicular to the venting plate.

[0052]

[0053] A battery unit according to exemplary embodiments of the present disclosure includes a gap filler pad below the battery cells, so that the battery cells can be accommodated in a barrier sheet without an air gap below the battery cells. In a battery pack with a bottom venting top cooling concept, an air gap below the battery cells promotes heat propagation during thermal runaway, but since the battery unit according to exemplary embodiments of the present disclosure has no air gap, safety can be enhanced.

[0054] The effects of the exemplary embodiments of the present disclosure are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by a person skilled in the art to which the present disclosure pertains from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be clearly derived and understood by a person skilled in the art to which the present disclosure pertains.

[0055]

[0056] FIG. 1 is a simplified drawing of a battery unit according to exemplary embodiments.

[0057] FIG. 2 is a simplified drawing of a battery cell assembly according to exemplary embodiments.

[0058] FIG. 3 is a simplified drawing of a battery cell assembly according to other exemplary embodiments.

[0059] FIG. 4 is a simplified diagram showing the interior of a battery pack according to exemplary embodiments.

[0060] FIG. 5 is a simplified diagram showing the interior of a battery pack according to other exemplary embodiments.

[0061] FIG. 6 is a simplified diagram showing the interior of a battery pack according to other exemplary embodiments.

[0062]

[0063] Terms or words used in this disclosure should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning consistent with the technical concept of this disclosure, based on the principle that the inventor can appropriately define the meaning of terms or words to best describe his own invention.

[0064] In this disclosure, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this disclosure, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between.

[0065] It should be understood that the embodiments and drawings are merely examples of the present disclosure and do not represent all of the technical ideas of the present disclosure, and that various equivalents and modifications that can replace them may exist.

[0066] In describing the present disclosure, if it is determined that a detailed description of a known configuration or function could obscure the essence of the present disclosure, such detailed description is omitted.

[0067] The drawings are provided to more fully explain the present disclosure to a person skilled in the art; therefore, the shapes, sizes, and number of components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. The shape, size, proportion, and number of each component in the drawings do not entirely reflect the actual shape, size, proportion, and number of each component.

[0068] In this disclosure, for convenience of explanation, a three-dimensional Cartesian coordinate system is used to describe the positions of the components, the shapes of the components, and the relationships between the components. The X-axis, Y-axis, and Z-axis are shown in FIGS. 1 through 6. In this disclosure, "X direction" refers to a direction parallel to the X-axis. In this disclosure, "Y direction" refers to a direction parallel to the Y-axis. In this disclosure, "Z direction" refers to a direction parallel to the Z-axis.

[0069] In the present disclosure, "+X direction" means the same direction as the arrow direction of the X-axis shown in FIGS. 1 to 6. In the present disclosure, "-X direction" means the opposite direction to the arrow direction of the X-axis shown in FIGS. 1 to 6. In the present disclosure, "+Y direction" means the same direction as the arrow direction of the Y-axis shown in FIGS. 1 to 6. In the present disclosure, "-Y direction" means the opposite direction to the arrow direction of the Y-axis shown in FIGS. 1 to 6. In the present disclosure, "+Z direction" means the same direction as the arrow direction of the Z-axis shown in FIGS. 1 to 6. In the present disclosure, "-Z direction" means the opposite direction to the arrow direction of the Z-axis shown in FIGS. 1 to 6.

[0070]

[0071] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the drawings.

[0072]

[0073] (1st embodiment)

[0074] FIG. 1 is a simplified drawing of a battery unit according to exemplary embodiments.

[0075] Referring to FIG. 1, the battery unit (10) may include a barrier sheet (11), battery cells (12), and a gap filler pad (13). The battery unit (10) may include battery cells (12) isolated by the barrier sheet (11) and the barrier pad (20) within a battery cell assembly (100, 100') (see FIG. 2 to 6).

[0076] The barrier sheet (11) may have a roughly U-shaped form. The barrier sheet (11) may include a first part (11_P1), a second part (11_P2), and a third part (11_P3). The first part (11_P1) may connect the second part (11_P2) and the third part (11_P3). The second part (11_P2) and the third part (11_P3) may be spaced apart from each other in the Y direction with the first part (11_P1) in between.

[0077] The barrier sheet (11) may include a flame-retardant material. The barrier sheet (11) can enhance safety by delaying or blocking heat transfer between adjacent battery units (10) during thermal runaway (see FIGS. 2 to 6). The barrier sheet (11) may include one or more of ceramic, silicon, and mica.

[0078] Each of the battery cells (12) may be a lithium secondary battery. Each of the battery cells (12) may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly may include a positive electrode, a negative electrode, and a separator. The positive electrode may include a positive active material layer, a positive current collector, and a positive tab. The negative electrode may include a negative active material layer, a negative current collector, and a negative tab. The electrode assembly may be a jelly roll type or a stack type. The jelly roll type may have a structure in which the positive electrode, the negative electrode, and the separator are wound. The stack type may have a structure in which a first electrode unit comprising a first positive electrode, a first negative electrode, and a first separator, and a second electrode unit comprising a second positive electrode, a second negative electrode, and a second separator are stacked with a third separator in between. The electrolyte may be a liquid type or a gel type. The cell case may be a pouch type. Each of the battery cells (12) may include a positive lead and a negative lead. The positive lead can be electrically connected to one or more positive tabs, and the negative lead can be electrically connected to one or more negative tabs. The positive lead and the negative lead can protrude from one side of the pouch-type cell case. The positive lead and the negative lead may protrude in the same direction or in opposite directions.

[0079] Battery cells (12) can be arranged in the Y direction. Battery cells (12) can be connected in parallel to form a bank. The positive leads of each battery cell (12) can be connected to each other by means such as welding. The negative leads of each battery cell (12) can be connected to each other by means such as welding.

[0080] Battery cells (12) can be accommodated in a barrier sheet (11). A first part (11_P1) may be located in the -Z direction relative to the battery cells (12). A second part (11_P2) may be located in the -Y direction relative to the battery cells (12), and a third part (11_P3) may be located in the +Y direction relative to the battery cells (12). The second part (11_P2) may be in contact with the battery cell (12) at the very front among the battery cells (12) arranged in the +Y direction, and the third part (11_P3) may be in contact with the battery cell (12) at the very back among the battery cells (12) arranged in the +Y direction. The first part (11_P1) may be spaced apart from the battery cells (12) in the Z direction.

[0081] A gap filler pad (13) may be interposed between the first part (11_P1) and the battery cells (12). Without the gap filler pad (13), an air gap may form between the first part (11_P1) and the battery cells (12). The air gap may be created by the tolerance between the battery cells (12) and the first part (11_P1). In the absence of the gap filler pad (13), if a thermal runaway event occurs in the battery cells (12), high-temperature gas flows in the -Z direction, and as the bottom plate (32) and / or venting plate (200) undergo thermal deformation in the -Z direction, the air gap may increase (see FIGS. 4 to 6). At this time, high-temperature gas, etc., may penetrate into the adjacent battery unit (10) through the air gap, thereby promoting heat propagation. However, as in exemplary embodiments, if the gap filler pad (13) fills the air gap, the aforementioned risks can be prevented, thereby enhancing safety.

[0082] The gap filler pad (13) may include a flame-retardant material. The gap filler pad (13) may prevent thermal deformation of the bottom plate (32) and / or the venting plate (200). The gap filler pad (13) may enhance safety by delaying or blocking heat transfer between adjacent battery units (10) in the event of thermal runaway (see FIGS. 2 to 6). The gap filler pad (13) may include one or more of ceramic, silicon, and mica.

[0083]

[0084] (2nd Example)

[0085] FIG. 2 is a simplified drawing of a battery cell assembly according to exemplary embodiments.

[0086] Referring to FIG. 2, the battery cell assembly (100) may include battery units (10) and barrier pads (20). The battery cell assembly (100) may not include a configuration that covers the battery units (10) and barrier pads (20) in the +Z direction or the -Z direction. The battery cell assembly (100) may be said to be conceptually different from a so-called battery module.

[0087] Each of the battery units (10) is substantially the same as that described in the first embodiment. The battery units (10) and the barrier pads (20) may be arranged alternately in the Y direction. A barrier pad (20) may be interposed between adjacent battery units (10). A battery unit (10) may be interposed between adjacent barrier pads (20). A barrier pad (20) may be in contact with at least one of the second part (11_P2) and the third part (11_P3).

[0088] The barrier pad (20) may include a flame-retardant material. The barrier pad (20) can enhance safety by delaying or blocking heat transfer between adjacent battery units (10) during thermal runaway. The barrier pad (20) may include one or more of ceramic, silicon, and mica.

[0089] If each of the battery units (10) includes one bank, then one battery cell (12) and another battery cell (12) among the adjacent battery units (10) can be connected in series. The positive leads of the battery cells (12) constituting each of the banks can be connected to the negative leads of the battery cells (12) constituting the preceding bank by means such as welding. The negative leads of the battery cells (12) constituting each of the banks can be connected to the positive leads of the battery cells (12) constituting the succeeding bank by means such as welding. The banks may include a first bank, intermediate banks, and a last bank.

[0090] When a battery cell assembly (100) includes n banks and each bank is composed of m battery cells (12), the connection type of the battery cells (12) can be described as m parallel - n series (mP-nS). The number of battery cells (12) included in the battery cell assembly (100) and the connection type of the battery cells (12) can be determined according to the current, voltage, and dimensions required of the battery cell assembly (100).

[0091] The battery cell assembly (100) may include first and second side beams spaced apart from each other in the Y direction with the battery units (10) and barrier pads (20) in between.

[0092] The first and second side beams may have a structure symmetrical to each other with respect to the battery units (10) and barrier pads (20). Each of the first and second side beams may have a roughly Γ-shaped structure. The first and second side beams may be fixed to the first and second integrated circuit assemblies described later. When the battery cell assembly (100) is mounted on the venting plate (200), each of the first and second side beams may be fixed to the cross beam (400) by means such as bolting (see FIG. 4).

[0093] The first and second side beams may have structures that are complementary to each other. One of the first and second side beams may have an approximately L-shaped structure and the other may have a Γ-shaped structure. The first side beam of one of the adjacent battery cell assemblies (100) may be joined to the other second side beam by means such as bolting. At this time, the joined first and second side beams may serve as cross beams of the battery pack.

[0094] The battery cell assembly (100) may include first and second integrated circuit assemblies spaced apart from each other in the X direction with respect to battery units (10) and barrier pads (20). The battery cell assembly (100) may include a Flexible Flat Cable (FFC).

[0095] The first integrated circuit assembly may include an insulating frame, an integrated circuit, a positive bus bar, a negative bus bar, sensing bars, sensing pads, wires, and an insulating cover.

[0096] The insulating frame may include a material with high electrical insulation properties, such as plastic. The integrated circuit, positive bus bar, and negative bus bar may be fixed to the insulating frame.

[0097] The integrated circuit may be configured to measure the voltage of the nodes. Each of the nodes may consist of corresponding positive leads and / or negative leads welded to one another.

[0098] The positive leads of the battery cells (12) constituting the first bank can be connected to the positive bus bar by means such as welding. The negative leads of the battery cells (12) constituting the last bank can be connected to the negative bus bar by means such as welding. Electrical connection between the battery cell assembly (100) and an external system can be made through the positive bus bar and the negative bus bar.

[0099] Each of the sensing bars can be coupled to a corresponding positive bus bar and a negative bus bar. Each of the sensing pads can be coupled to a corresponding positive lead and a negative lead welded to each other. Each of the wires can connect a corresponding of the sensing bars and sensing pads to an integrated circuit.

[0100] The insulating cover may include a material with high electrical insulation properties, such as plastic. The insulating cover may be snap-fitted to an insulating frame. The insulating cover can cover and protect integrated circuits, positive bus bars, negative bus bars, sensing bars, sensing pads, and wires.

[0101] The second integrated circuit assembly may include an insulating frame, an integrated circuit, sensing pads, wires, and an insulating cover. The second integrated circuit assembly may be substantially identical to the first integrated circuit assembly except that it does not include a positive bus bar, a negative bus bar, and sensing bars.

[0102] The FFC can electrically connect the first integrated circuit assembly and the second integrated circuit assembly to each other. The FFC can transmit a sensing value, such as a voltage measured by the integrated circuit of the second integrated circuit assembly, to the integrated circuit of the first integrated circuit assembly.

[0103]

[0104] (3rd Example)

[0105] FIG. 3 is a simplified drawing of a battery cell assembly according to other exemplary embodiments.

[0106] Referring to FIG. 3, the battery cell assembly (100') may include battery units (10), barrier pads (20), a first module frame (31), and a second module frame (32). The battery cell assembly (100') may be referred to as a so-called battery module.

[0107] The battery units (10) and barrier pads (20) are substantially the same as those described in the second embodiment.

[0108] The first module frame (31) can cover the battery units (10) and barrier pads (20) in the +Z direction. The first module frame (31) may have an approximately inverted U shape. The first module frame (31) may include a top plate (TP) and a pair of first vertical sections. The top plate (TP) may be substantially perpendicular to the Z direction. The pair of first vertical sections may be substantially perpendicular to the Y direction. The top plate (TP) may be connected to the pair of first vertical sections. The pair of first vertical sections may be spaced apart from each other in the Y direction with the top plate (TP) in between. The top plate (TP) may be located in the +Z direction relative to the battery units (10) and barrier pads (20). One of the pair of first vertical sections may be in the -Y direction relative to the battery units (10) and barrier pads (20), and the other may be in the +Y direction relative to the battery units (10) and barrier pads (20).

[0109] The second module frame (32) can cover the battery units (10) and barrier pads (20) in the -Z direction. The second module frame (32) may have a roughly U-shaped form. The second module frame (32) may include a bottom plate (BP) and a pair of second vertical sections. The bottom plate (BP) may be substantially perpendicular to the Z direction. The pair of second vertical sections may be substantially perpendicular to the Y direction. The bottom plate (BP) may be connected to the pair of second vertical sections. The pair of second vertical sections may be spaced apart from each other in the Y direction with the bottom plate (BP) in between. The bottom plate (BP) may be located in the -Z direction relative to the battery units (10) and barrier pads (20). One of the pair of second vertical sections may be in the -Y direction relative to the battery units (10) and barrier pads (20), and the other may be in the +Y direction relative to the battery units (10) and barrier pads (20).

[0110] The first module frame (31) and the second module frame (32) can be combined. The first module frame (31) and the second module frame (32) can accommodate battery units (10) and barrier pads (20). One of the pair of second vertical sections can be in contact with the corresponding one of the pair of first vertical sections, and the other of the pair of second vertical sections can be in contact with the other of the pair of first vertical sections. One of the pair of second vertical sections can be between the corresponding one of the pair of first vertical sections and the battery unit (10), and the other of the pair of second vertical sections can be between the other of the pair of first vertical sections and the battery unit (10).

[0111] The bottom plate (BP) may include second vent holes (VH2). When a thermal runaway event occurs in the battery cells (12), high-temperature gas may flow in the -Z direction through the second vent holes (VH2).

[0112] The battery cell assembly (100') may include first and second integrated circuit assemblies spaced apart from each other in the X direction with respect to battery units (10) and barrier pads (20). The first and second integrated circuit assemblies may be the same as those described in the second embodiment. Each of the first and second integrated circuit assemblies may further include intermediate bus bars. The intermediate bus bars may be fixed to an insulating frame. Each of the intermediate bus bars may be connected to the positive leads or negative leads of the battery cells (12) constituting the corresponding intermediate banks by means such as welding.

[0113]

[0114] (Fourth Example)

[0115] FIG. 4 is a simplified diagram showing the interior of a battery pack according to exemplary embodiments.

[0116] Referring to FIG. 4, the battery pack (1000) may include battery cell assemblies (100), a venting plate (200), a base plate (300), bulkheads (400), and a heat sink (500). The battery pack (1000) may be the final form of a battery system mounted on a mobility device. The battery pack (1000) may be configured in a cell-to-pack manner.

[0117] Each of the battery cell assemblies (100) is substantially the same as that described in the second embodiment.

[0118] The venting plate (200) can support the battery cell assemblies (100). The venting plate (200) can be in contact with the battery units (10). The venting plate (200) can be substantially perpendicular to the Z direction. The venting plate (200) may include first vent holes (VH1). When a thermal runaway event occurs in the battery cell assembly (100), high-temperature gas can flow in the -Z direction through the first vent holes (VH1).

[0119] The base plate (300) may be spaced apart from the venting plate (200) in the Z direction. The base plate (300) may be located in the -Z direction relative to the venting plate (200). High-temperature gas flowing in the -Z direction through the first vent holes (VH1) may pass sequentially through the space between the base plate (300) and the venting plate (200) and the space inside the side wall, and then be vented to the outside of the battery pack (100) through the venting device. The side wall and the venting device will be described later.

[0120] The base plate (300) can be joined to the venting plate (200) by means such as bolting. A gasket may be interposed between the base plate (300) and the venting plate (200). The gasket may be located around the perimeter of the base plate (300) and the perimeter of the venting plate (200).

[0121] The bulkheads (400) can isolate the battery cell assemblies (100) in the Y direction. The bulkheads (400) can be substantially perpendicular to the Y direction. The bulkheads (400) can be provided by an extrusion process and may include hollows inside. The hollows may extend in the X direction. The bulkheads (400) can be made lighter by the hollows.

[0122] The heat sink (500) can cover the battery cell assemblies (100) in the +Z direction. The heat sink (500) can function as a lid for the battery pack (100). The heat sink (500) can be substantially perpendicular to the Z direction. The heat sink (500) may include cooling channels. The cooling channels may be formed by an extrusion process. A cooling fluid may flow through the cooling channels. The cooling fluid may absorb heat from the battery cell assembly (100) to lower the temperature of the battery cell assembly (100). The heat sink (500) may be joined to the side walls described later by means such as bolting. A gasket may be interposed between the heat sink (500) and the side walls. The gasket may be located around the perimeter of the heat sink (500).

[0123] The battery pack (1000) may include side walls. The side walls may be located around the perimeter of the venting plate (200). The side walls may be fixed to the venting plate (200) by means such as bolting or welding. The side walls may surround the components inside the battery pack (1000). The side walls may be provided by an extrusion process and may include hollows inside. The side walls may be lightweighted by the hollows. High-temperature gas may flow into the hollows.

[0124] One or more venting devices may be installed on one or more of the side walls. The venting device may be configured to provide a path for high-temperature gases, etc., inside the battery pack (100) to be discharged to the outside of the battery pack (100) in the event that an accident, such as a thermal runaway event, occurs inside the battery pack (100). The venting device may be configured to prevent dust, moisture, water, etc., from outside the battery pack (100) from entering the battery pack (100).

[0125] The battery pack (1000) may include electronic components. Electronic components may include a Battery Management System (BMS), a Power Relay Assembly (PRA), a safety plug, etc. The BMS may be configured to monitor the voltage, current, temperature, etc. of the battery cells (12), to evenly balance the voltage, capacity, etc. between the battery cells (12), and to control the charging and discharging of the battery cells (12). The PRA may be configured to connect or disconnect a high-voltage circuit according to a signal from the BMS to supply or cut off the high-voltage current of the battery cell assemblies (100) to an external load, such as a motor or inverter. The PRA may be configured to mitigate voltage surges to prevent damage to the external load, such as a motor or inverter.

[0126]

[0127] (5th Example)

[0128] FIG. 5 is a simplified diagram showing the interior of a battery pack according to other exemplary embodiments.

[0129] Referring to FIG. 5, the battery pack (1000') may include battery cell assemblies (100'), a venting plate (200), a base plate (300), partitions (400), a heat sink (500), and a Thermal Interface Material Layer (TIM layer) (600). The battery pack (1000') may be the final form of a battery system mounted on a mobility device. The battery pack (1000') may be configured in a cell-to-module-to-pack manner.

[0130] Each of the battery cell assemblies (100') is substantially the same as described in the third embodiment. The venting plate (200), base plate (300), bulkheads (400), and heat sink (500) are substantially the same as described in the fourth embodiment.

[0131] A bottom plate (BP) may be located between the venting plate (200) and the battery units (10). The battery units (10) may be spaced apart from the venting plate (200) in the Z direction. The second vent holes (VH2) and the first vent holes (VH1) may overlap in the Z direction. When a thermal runaway event occurs in the battery cell assembly (100'), high-temperature gas may flow in the -Z direction through the second vent holes (VH2) and the first vent holes (VH1).

[0132] The TIM layer (600) may be located between the top plate (TP) and the heat sink (500). The TIM layer (600) may mediate heat transfer between the battery cell assemblies (100') and the heat sink (500). The TIM layer (600) may facilitate cooling of the battery cell assemblies (100').

[0133] The TIM layer (600) may comprise a resin composition. The resin composition may be cured at room temperature. The curing of the resin composition may be accelerated at a temperature higher than room temperature. The resin composition may comprise a base resin, a curing agent, and an inorganic filler. The base resin may comprise one or more of urethane resin, silicone resin, epoxy resin, and acrylic resin. The curing agent may be determined according to the base resin. The curing agent may comprise one or more of isocyanate compounds, siloxane compounds, amine compounds, and peroxide compounds.

[0134] The battery pack (1000') may include side walls, one or more venting devices and electrical components, which are substantially the same as those described in the fifth embodiment.

[0135]

[0136] (6th Example)

[0137] The sixth embodiment is substantially the same as the fourth or fifth embodiment except that it further includes a venting channel (700).

[0138] FIG. 6 is a simplified diagram showing the interior of a battery pack according to other exemplary embodiments.

[0139] Referring to FIG. 6, the battery pack (1000'') may further include a venting channel (700). FIG. 6 is illustrated as the battery pack (1000'') including a battery cell assembly (100'), but this is merely exemplary. The battery pack (1000'') may include a battery cell assembly (100) instead of a battery cell assembly (100').

[0140] The venting channel (700) may have a roughly corrugated structure. The venting channel (700) may be located between the venting plate (200) and the base plate (300). The venting channel (700) may include third vent holes (VH3). The third vent holes (VH3) may overlap with the first vent holes (VH1) in the Z direction. The third vent holes (VH3) may overlap with the second vent holes (VH2) in the Z direction. When a thermal runaway event occurs in the battery cell assembly (100'), high-temperature gas may flow in the -Z direction through the second vent holes (VH2), the first vent holes (VH1), and the third vent holes (VH).

[0141]

[0142] The foregoing description is merely for illustrative purposes only. The scope of the rights of the present disclosure shall be interpreted by the claims, and all technical ideas within the scope equivalent or equivalent thereto shall be interpreted as being included within the scope of the rights of the present disclosure.

[0143]

[0144] [Explanation of the symbol]

[0145] 10: Battery unit

[0146] 11: Barrier sheet

[0147] 11_P1: Part 1

[0148] 11_P2: Part 2

[0149] 11_P3: Part 3

[0150] 12: Battery cell

[0151] 13: Gap filler pad

[0152] 100, 100': Battery cell assembly

[0153] 20: Barrier Pad

[0154] 31: 1st Module Frame

[0155] 32: Second Module Frame

[0156] TP: Top Plate

[0157] BP: Bottom Plate

[0158] VH2: Second vent hole

[0159] 1000, 1000', 1000'': Battery pack

[0160] 200: Venting plate

[0161] VH1: 1st vent hole

[0162] 300: Base Plate

[0163] 400: Bulkhead

[0164] 500: Heat Sink

[0165] 600: TIM layer

[0166] 700: Venting Channel

[0167] VH3: Third vent hole

Claims

1. A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between; Battery cells accommodated in the barrier sheet and arranged in a first direction; and Gap filler pad between the first part and the battery cells; A battery unit including 2. In Paragraph 1, The second part above is in contact with the battery cell furthest forward in the first direction among the battery cells, and The above third part is a battery unit that contacts the battery cell furthest back in the first direction among the battery cells.

3. In Paragraph 1, The above gap filler pad is a battery unit comprising one or more of ceramic, silicon, and mica.

4. In Paragraph 1, The above barrier sheet is a battery unit comprising one or more of ceramic, silicon, and mica.

5. In Paragraph 1, The above battery cells are connected in parallel to form a battery unit.

6. A battery cell assembly comprising battery units and barrier pads, Each of the above battery units is: A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between; Battery cells accommodated in the barrier sheet and arranged in a first direction; and Gap filler pad between the first part and the battery cells; Includes, The above battery units and the above barrier pads are arranged alternately in a battery cell assembly.

7. In Paragraph 6, Each of the above barrier pads is a battery cell assembly in contact with at least one of the second and third parts.

8. In Paragraph 6, Each of the above barrier pads is a battery cell assembly comprising one or more of ceramic, silicon, and mica.

9. Venting plate including first vent holes; Battery cell assemblies on the above-mentioned venting plate; and Heat sink on the above battery cell assemblies; As a battery pack including, Each of the above battery cell assemblies includes battery units and barrier pads arranged alternately with one another, and Each of the above battery units is: A U-shaped barrier sheet, wherein the barrier sheet comprises a first portion and second and third portions spaced apart from each other with the first portion in between; Battery cells accommodated in the barrier sheet and arranged in a first direction; and Gap filler pad between the first part and the battery cells; A battery pack including 10. In Paragraph 9, Each of the above battery cell assemblies includes a bottom plate between the venting plate and the battery units, and The above bottom plate is a battery pack including second vent holes.

11. In Paragraph 10, A battery pack in which the second vent holes and the first vent holes overlap in a second direction perpendicular to the venting plate.

12. In Paragraph 9, The above battery units are battery packs in contact with the above venting plate.

13. In Paragraph 9, It further includes a base plate under the above-mentioned venting plate, and The above base plate is a battery pack spaced apart from the above venting plate.

14. In Paragraph 13, A battery pack further comprising a venting channel having a corrugated structure located between the venting plate and the base plate.

15. In Paragraph 14, The above venting channel includes third vent holes, and A battery pack in which the above third vent holes and the above first vent holes overlap in a second direction perpendicular to the venting plate.

Images