Battery cell assembly and battery pack including same

Abstract

The technical idea of ​​the present invention provides a battery cell assembly including: a cell block including a plurality of battery cells; a bus bar connected to an electrode lead of the cell block; a bus bar frame on which the bus bar is mounted and having an accommodation space for accommodating a portion of the bus bar; and a thermally conductive filler that at least partially fills the accommodation space of the bus bar frame and is in contact with the bus bar.

Description

[Technical Field]

[0001] The present invention relates to a battery cell assembly and a battery pack including the battery cell assembly.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0095852, filed on July 24, 2023, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and wireless vacuum cleaners. As secondary batteries are applied to mobility fields such as battery electric vehicles (BETs), research is underway to increase the battery capacity and energy density of secondary batteries, as well as to reduce damage caused by heat generation and improve the reliability of secondary batteries. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve relates to a battery cell assembly and a battery pack including the battery cell assembly. [Means for solving the problem]

[0005] In order to solve the above-described problems, the technical idea of ​​the present invention provides a battery cell assembly including: a cell block including a plurality of battery cells; a bus bar connected to an electrode lead of the cell block; a bus bar frame on which the bus bar is mounted and having an accommodation space for accommodating a portion of the bus bar; and a thermally conductive filler that at least partially fills the accommodation space of the bus bar frame and is in contact with the bus bar.

[0006] An exemplary embodiment further includes a cooling plate on the cell block and in contact with the thermally conductive filler.

[0007] In an exemplary embodiment, the bus bar frame includes a slit on a lower side of the accommodating space and an opening on an upper side of the accommodating space, the bus bar is inserted into the accommodating space of the bus bar frame through the slit of the bus bar frame, and the first portion of the cooling plate is inserted into the accommodating space of the bus bar frame through the opening of the bus bar frame.

[0008] In an exemplary embodiment, at least a portion of the first portion of the cooling plate is embedded in the thermally conductive filler.

[0009] In an exemplary embodiment, the cooling plate is coupled to an upper surface of the cell block, and the bus bar frame is coupled to one side of the cell block.

[0010] In an exemplary embodiment, the cell block further includes another bus bar connected to another electrode lead of the cell block, and the thermally conductive filler is in contact with the other bus bar.

[0011] In an exemplary embodiment, the thermally conductive filler is characterized by including a first material layer including silicone and a second material layer laminated on the first material layer and including a thermally conductive resin.

[0012] In an exemplary embodiment, the bus bar is an inter-bus bar connecting different electrode leads of the cell block to each other or a terminal bus bar electrically connected to an external electrical device.

[0013] In order to solve the above-described problems, the technical idea of ​​the present invention provides a battery pack including: a pack housing; and a plurality of battery cell assemblies mounted in the pack housing and arranged in a first direction, each of the plurality of battery cell assemblies including a cell block including a plurality of battery cells; a cooling plate on the cell block; a plurality of bus bars connected to different electrode leads of the cell block; a bus bar frame including a lower portion on which the plurality of bus bars are mounted and an upper portion having an accommodating space for accommodating portions of the plurality of bus bars and a first portion of the cooling plate; and a thermally conductive filler that at least partially fills the accommodating space of the bus bar frame and is configured to be in contact with the plurality of bus bars and the cooling plate so as to thermally couple the plurality of bus bars to the cooling plate.

[0014] In an exemplary embodiment, the bus bar frame includes a plurality of slits on a lower side of the accommodating space and an opening on an upper side of the accommodating space, the plurality of bus bars are inserted into the accommodating space of the bus bar frame through corresponding slits among the plurality of slits, and the first portion of the cooling plate is inserted into the accommodating space of the bus bar frame through the opening of the bus bar frame.

[0015] In an exemplary embodiment, the plurality of bus bars are arranged in a first direction, and the first portion of the cooling plate extends continuously in the first direction and is in continuous contact with the thermally conductive filler.

[0016] In an exemplary embodiment, the cooling plate is coupled to an upper surface of the cell block, and the bus bar frame is coupled to one side of the cell block.

[0017] In an exemplary embodiment, the battery pack includes a lower housing that houses the plurality of battery cell assemblies, and a top plate that is coupled onto the lower housing to cover the plurality of battery cell assemblies, and the plurality of battery cell assemblies are supported by hanging from the top plate.

[0018] In an exemplary embodiment, the plurality of battery cell assemblies are spaced apart from the bottom wall of the lower housing, and a space is formed between each of the plurality of battery cell assemblies and the bottom wall of the lower housing.

[0019] In an exemplary embodiment, the plurality of battery cell assemblies each include a cell block in which pouch-type battery cells are stacked. [Effects of the Invention]

[0020] According to an exemplary embodiment of the present invention, the busbars are thermally coupled to the cooling plate by the thermally conductive filler, thereby improving the cooling efficiency of the busbars, thereby preventing thermal damage to the busbars and improving the reliability of the battery cell assembly.

[0021] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view illustrating a battery cell assembly according to an exemplary embodiment of the present invention. [Figure 2]FIG. 2 is a side view illustrating a configuration of a portion of a battery cell assembly according to an exemplary embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view showing a configuration of a portion of a battery cell assembly according to an exemplary embodiment of the present invention. [Figure 4] FIG. 2 is a plan view illustrating a configuration of a portion of a battery cell assembly according to an exemplary embodiment of the present invention. [Figure 5] FIG. 2 is a cross-sectional view illustrating a portion of a battery cell assembly according to an exemplary embodiment of the present invention. [Figure 6] 1 is a cross-sectional view illustrating a battery pack according to an exemplary embodiment of the present invention. [Figure 7] 1 is a schematic diagram illustrating an electric vehicle equipped with a battery pack according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that an inventor can appropriately define the concepts of terms to best describe his own invention.

[0024] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0025] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0026] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and therefore the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0027] (First embodiment) 1 to 4 are drawings showing a battery cell assembly 100 according to an exemplary embodiment of the present invention, in which FIG. 1 is a perspective view showing the battery cell assembly 100, FIG. 2 is a side view showing a partial configuration of the battery cell assembly 100, FIG. 3 is a cross-sectional view showing a partial configuration of the battery cell assembly 100, and FIG. 4 is a plan view showing a partial configuration of the battery cell assembly 100.

[0028] 1 to 4, a battery cell assembly 100 may include a cell block 110, a case 120 having a cooling plate 121, a bus bar 130, a bus bar frame 140, and a thermally conductive filler 150.

[0029] The cell block 110 may include multiple battery cells 111. Each battery cell 111 is the basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell 111 may include an electrode assembly, an electrolyte, and a case. The electrode assembly housed in the case may include a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Depending on the assembly form, the electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a wound structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include multiple positive electrodes, multiple negative electrodes, and multiple separators interposed therebetween, stacked in sequence. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0030] The plurality of battery cells 111 may be connected in series and / or parallel. For example, the plurality of battery cells 111 may be connected in series to each other. For example, the plurality of battery cells 111 may be connected in parallel to each other. For example, when a set of two or more battery cells 111 connected in parallel to each other is defined as a bank, one bank consisting of two or more battery cells 111 connected in parallel to each other and another bank consisting of two or more battery cells 111 connected in parallel to each other may be connected in series.

[0031] The individual battery cells 111 may correspond to pouch-type battery cells, cylindrical battery cells, or prismatic battery cells. The electrode assembly of a pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can. In an exemplary embodiment, the battery cell assembly 100 may be a battery module including a module case that surrounds the top, bottom, left, and right sides of the cell block 110, or may be a device having a form in which part or all of the module case is removed.

[0032] In the exemplary embodiment, each battery cell 111 corresponds to a pouch-type battery cell, and the plurality of battery cells 111 in one battery cell assembly 100 may be stacked on top of each other in a first direction (X direction). In the exemplary embodiment, each battery cell assembly 100 includes the plurality of battery cells 111 each corresponding to a pouch-type battery cell whose length along the first direction (X direction) is shorter than its length along a second direction (Y direction), and the plurality of battery cells 111 may be stacked on top of each other in the first direction (X direction).

[0033] In an exemplary embodiment, each battery cell assembly 100 may include a single cell block 110. However, without being limited thereto, each battery cell assembly 100 may also include a plurality of sub-cell blocks arranged in a second direction (Y direction), and each of the plurality of sub-cell blocks may include a plurality of battery cells 111 stacked in a first direction (X direction). For example, each battery cell assembly 100 may include two sub-cell blocks arranged in the second direction (Y direction).

[0034] When viewed from above, the cell block 110 may have a rectangular shape, with first and second side surfaces opposite each other in a first direction (X direction), front and rear surfaces opposite each other in a second direction (Y direction), and top and bottom surfaces opposite each other in a third direction (Z direction).

[0035] The busbar frames 140 may be disposed on the front and rear surfaces of the cell block 110. A plurality of busbars 130 may be mounted on the busbar frame 140 on the front surface of the cell block 110, and a plurality of busbars 130 may be mounted on the busbar frame 140 on the rear surface of the cell block 110. The busbar frames 140 may support the electrode leads 119 of the cell block 110. The electrode leads 119 may include positive and negative leads provided on each of the plurality of battery cells (see 111 in FIG. 6 ). The battery cell assembly 100 may include the busbar frame 140 on the front surface of the cell block 110 and an end plate 171 for covering the busbar frame 140 on the rear surface of the cell block 110.

[0036] The bus bar frame 140 may include an insulating material. The bus bar frame 140 may include an intumescent fire-resistant paint. Here, the intumescent fire-resistant paint may include a dry coating layer that foams when exposed to heat. The foaming of the dry coating layer may form an insulating layer (e.g., a carbonized layer) having a volume several tens of times that of the dry coating layer. The insulating layer may delay heat transfer to the protected object (e.g., the plurality of battery cells 111) for a certain period of time.

[0037] The bus bars 130 may be coupled to the electrode leads 119 of the battery cells 111. For example, the bus bars 130 may be coupled to the electrode leads 119 of the battery cells 111 by welding. For example, each bus bar 130 may be coupled to the electrode leads 119 coupled to different battery cells 111 belonging to the cell block 110, and may be an inter-bus bar for electrically connecting the different battery cells 111. For example, each bus bar 130 may be a terminal bus bar for electrically connecting the battery cell assembly 100 to another external electric device.

[0038] The case 120 can house the cell block 110. For example, the case 120 can encase a first side, a second side, and a top surface of the cell block 110. For example, the case 120 can include side walls for covering the first and second side surfaces of the cell block 110 and a top wall for covering the top surface of the cell block 110. The case 120 can be coupled to bus bar frames 140 on the front and rear surfaces of the cell block 110.

[0039] The case 120 may include a cooling plate 121 that forms an upper wall of the cell block 110. The cooling plate 121 may be attached to an upper surface of the cell block 110 and may be thermally coupled to the cell block 110. For example, the cooling plate 121 may be attached to the upper surface of the cell block 110 by a thermal interface material (TIM) layer. The cooling plate 121 may have cooling channels 1211 configured to allow a cooling fluid to flow. A cooling fluid provided from the outside of the battery cell assembly 100 may flow into the cooling channels 1211 through an inlet of the cooling channels 1211, flow along the cooling channels 1211, and then flow out to the outside through an outlet of the cooling channels 1211. While the cooling fluid flows along the cooling channels 1211, cooling of the battery cell assembly 100 may be performed. For example, the cooling plate 121 may be manufactured by bonding two plates, and the cooling channel 1211 may include a space defined between the two plates.

[0040] Meanwhile, the bus bar frame 140 may include a lower portion 141 on which the bus bars 130 are mounted, and an upper portion 145 having an accommodating space 1451 in which each portion of the bus bars 130 is accommodated. In the bus bar frame 140, the upper portion 145 of the bus bar frame 140 may be closer to the cooling plate 121 than the lower portion 141. The upper portion 145 of the bus bar frame 140 and the lower portion 141 of the bus bar frame 140 may be integral with each other.

[0041] Slits 1453 may be provided on a lower side of the accommodating space 1451 of the busbar frame 140, and openings 1452 may be provided on an upper side of the accommodating space 1451 of the busbar frame 140. The accommodating space 1451 of the busbar frame 140 may be in communication with the slits 1453 and the openings 1452. Each of the slits 1453 of the busbar frame 140 may provide a passage through which one busbar 130 passes. When viewed from above, one slit 1453 may have approximately the same dimensions as one busbar 130. Each busbar 130 is inserted into the corresponding slit 1453, and an upper portion of each busbar 130 may be accommodated in the accommodating space 1451 of the busbar frame 140. The first portion 1213 of the cooling plate 121 may extend into the accommodating space 1451 of the busbar frame 140 through the opening 1452 of the busbar frame 140. When viewed from a plane, the bus bars 130 may be arranged in a first direction (X direction), and the first portion 1213 of the cooling plate 121 may extend linearly and continuously in the first direction (X direction). A portion of the first portion 1213 of the cooling plate 121 may be embedded in the thermally conductive filler 150. The first portion 1213 of the cooling plate 121 may be in continuous contact with the thermally conductive filler 150 in the first direction (X direction).

[0042] When viewed in cross section, the first portion 1213 of the cooling plate 121 may extend at an angle from a portion of the cooling plate 121 facing the upper surface of the cell block 110. For example, when viewed in cross section, the first portion 1213 of the cooling plate 121 may include a portion bent downward from a portion of the cooling plate 121 facing the upper surface of the cell block 110 or a portion of the cooling plate 121 in contact with the uppermost end of the bus bar frame 140.

[0043] The thermally conductive filler 150 may be provided in the receiving space 1451 of the bus bar frame 140. The thermally conductive filler 150 may at least partially fill the receiving space 1451 of the bus bar frame 140. The thermally conductive filler 150 may be thermally conductive and electrically non-conductive. For example, the thermally conductive filler 150 may include a thermally conductive resin. The thermally conductive filler 150 may include a single material layer or multiple material layers. The thermally conductive filler 150 may also be referred to as a thermally conductive material layer.

[0044] The thermally conductive filler 150 may be configured to thermally couple the bus bars 130 to the cooling plate 121. The thermally conductive filler 150 may contact the bus bars 130 inserted into the accommodating spaces 1451 of the bus bar frame 140 through the slits 1453 of the bus bar frame 140, and may also contact the first portions 1213 of the cooling plate 121 inserted into the accommodating spaces 1451 of the bus bar frame 140 through the openings 1452 of the bus bar frame 140. The thermally conductive filler 150 may provide a heat conduction path for thermally coupling each of the bus bars 130 to the cooling plate 121.

[0045] According to an exemplary embodiment of the present invention, the bus bar 130 is thermally coupled to the cooling plate 121 by the thermally conductive filler 150, thereby improving the cooling efficiency of the bus bar 130. This can prevent thermal damage to the bus bar 130, thereby improving the reliability of the battery cell assembly 100.

[0046] (Second embodiment) 5 is a cross-sectional view showing a portion of a battery cell assembly 100A according to an exemplary embodiment of the present invention. The battery cell assembly 100A shown in FIG. 5 will be described below, focusing on differences from the battery cell assembly 100 described with reference to FIGS. 1 to 4.

[0047] 5, the thermally conductive filler 150A may include a first material layer 151 and a second material layer 152 laminated on the first material layer 151. The first material layer 151 and the second material layer 152 may include different materials. In an exemplary embodiment, the first material layer 151 may include silicone and may function as a sealing layer for sealing the bottom of the receiving space 1451 of the bus bar frame 140. In an exemplary embodiment, the second material layer 152 may include a thermally conductive resin and may provide a thermal conduction path for thermally coupling each of the bus bars 130 to the cooling plate 121.

[0048] (Third embodiment) 6 is a cross-sectional view showing a battery pack 500 according to an exemplary embodiment of the present invention. In the following, descriptions that overlap with those described above will be omitted or simplified.

[0049] Referring to FIG. 6 , a battery pack 500 may include a pack housing 510 and a plurality of battery cell assemblies 100 mounted in the pack housing 510 .

[0050] A plurality of battery cell assemblies 100 may be mounted in the pack housing 510 so as to be arranged in a first direction (X direction). In Fig. 6, the battery pack 500 is illustrated as including two battery cell assemblies 100 arranged in the first direction (X direction), but this is not limiting. For example, the battery pack 500 may include three or more battery cell assemblies 100 arranged in the first direction (X direction).

[0051] The pack housing 510 may include a lower housing 511 having an accommodation space for accommodating the plurality of battery cell assemblies 100, and a top plate 515 coupled to the lower housing 511 to cover the lower housing 511 accommodating the plurality of battery cell assemblies 100. The accommodation space of the lower housing 511 may be defined by a bottom wall facing the bottom surface of the cell block 110 of each battery cell assembly 100, and side walls positioned around the bottom wall. The top plate 515 is a pack lid that covers the plurality of battery cell assemblies 100. When the battery pack 500 is mounted on a vehicle, a cabin room where passengers board may be located above the top plate 515, and the ground on which the vehicle runs may be located below the lower housing 511.

[0052] In an exemplary embodiment, the plurality of battery cell assemblies 100 may each be fastened to and supported by a corresponding one of the support blocks 5111 of the lower housing 511. A fastening portion 127 of the case 120 is provided on one side of each battery cell assembly 100, and the fastening portion 127 may be fastened to and supported by a corresponding one of the support blocks 5111 of the lower housing 511 using a fastening member such as a bolt BT.

[0053] In the exemplary embodiment, the plurality of battery cell assemblies 100 may each be supported by hanging from the top plate 515. The individual battery cell assemblies 100 may be coupled to the lower surface of the top plate 515.

[0054] In addition, a free volume FV may be provided between the lower surface of each battery cell assembly 100 and the bottom wall of the lower housing 511. The free volume FV may be understood as a space formed when the bottom wall of the lower housing 511 and each battery cell assembly 100 are spaced apart from each other.

[0055] The present invention provides an inverted support structure in which each battery cell assembly 100 is supported by hanging from a top plate 515. In addition, a free volume FV is provided between the bottom of the battery pack 500 (i.e., the bottom wall of the lower housing 511) and each battery cell assembly 100. The free volume FV allows gas and flames generated in a thermal runaway situation to move. That is, the free volume FV serves as a venting passage through which high-temperature gas and flames can move.

[0056] In addition, even when a strong impact occurs due to foreign objects flying onto the underside of the vehicle while driving on hard ground, such as an unpaved road, the free volume FV can absorb the impact. Therefore, damage to the battery cell assemblies 100 caused by the impact can be prevented. The free volume FV has a space between each of the battery cell assemblies 100 and the lower housing 511. When the lower housing 511 deforms toward the battery cell assembly 100 due to an impact applied to the underside of the vehicle, the free volume FV can be used as a space that allows for some degree of freedom in allowing deformation of the lower housing 511. No other structure may be installed in the free volume FV. Alternatively, a structure that supports the battery cell assembly 100, etc., may be installed partially within the free volume FV. When a structure is installed within the free volume FV, a space large enough to allow deformation of the lower housing 511 needs to be provided between the battery cell assembly 100 and the lower housing 511.

[0057] The height of the free volume FV and the distance between the bottom wall of the lower housing 511 and the battery cell assembly 100 may be set sufficiently to absorb external impacts. The height of the free volume FV may be determined in consideration of the dimensions and rigidity of the vehicle frame, the dimensions and rigidity of the lower housing 511, the dimensions of the battery pack 500, the amount of gas generated and the rate of gas discharge during thermal runaway, and the like. For example, when the thickness or rigidity of the vehicle frame or the bottom wall of the lower housing 511 is relatively large, at least one of the size and height of the free volume FV may be relatively small. Furthermore, when the thickness or rigidity of the vehicle frame or the bottom wall of the lower housing 511 is relatively small, the bottom wall of the lower housing 511 is likely to deform, and therefore, at least one of the size and height of the free volume FV may be relatively increased to protect the battery cell assembly 100. Furthermore, when the size of the battery pack 500 is relatively large according to the battery pack 500 specifications, a relatively large free volume FV may be ensured. When the size of the battery pack 500 is relatively small, the height of the free volume FV that can be secured may be relatively low, and it may be necessary to relatively increase the thickness and rigidity of the bottom wall of the lower housing 511. Furthermore, if the height of the free volume FV is too low, the gas discharge path becomes small, and the internal pressure of the battery pack 500 may rise rapidly during thermal runaway. Therefore, the size and height of the free volume FV can be determined taking into account the amount of gas generated and the discharge speed.

[0058] The maximum height of the free volume FV may be determined depending on the degree of damage to the battery cells 111 included in the battery cell assembly 100. For example, if the damage tolerance limit of the battery cell 111 is 1 mm, the free volume FV may be determined so that the battery cell 111 does not deform more than 1 mm when the lower housing 511 deforms and presses the lower surface of the battery cell 111. In this case, the amount of deformation of the lower housing 511 may vary depending on the thickness and rigidity of the lower housing 511. Therefore, the size and height of the free volume FV may be determined in consideration of both the damage tolerance limit of the battery cell 111 and the thickness and rigidity of the lower housing 511.

[0059] The upper surface of each battery cell assembly 100 may be tightly coupled to the lower surface of the top plate 515. If there is a space between the battery cell assembly 100 and the top plate 515, high-temperature gas may be introduced into the space between the battery cell assembly 100 and the top plate 515 during thermal runaway, causing heat and flame to spread to other adjacent battery cell assemblies 100. In addition, heat and flame may be transferred to the top plate 515, potentially affecting the cabin room above the top plate 515. Therefore, by tightly coupling the upper surface of each battery cell assembly 100 to the lower surface of the top plate 515, gas and flame generated inside the battery pack 500 can be guided to the free volume FV.

[0060] (Fourth embodiment) FIG. 7 is a schematic diagram illustrating an electric vehicle 1000 equipped with a battery pack 1100 according to an exemplary embodiment of the present invention.

[0061] 7, for simplicity of illustration, only the vehicle body frame 1200 that forms the lower skeleton of the vehicle, the battery pack 1100 coupled to the vehicle body frame 1200, and tires are shown. The battery pack 1100 may include, for example, the battery pack 500 described with reference to FIG.

[0062] In a typical battery pack, a battery cell assembly is installed at the bottom of the battery pack housing. However, in this embodiment, the battery cell assembly 100 of the battery pack 1100 has a structure in which it is suspended from and supported by the top plate 1120 of the housing. That is, there is no space between the battery cell assembly 100 and the top plate 1120, preventing gas generated in the battery cell assembly 100 from being transmitted to the cabin at the top of the vehicle. The gas is guided to a free volume (see FV in FIG. 6 ) provided below the battery cell assembly 100 and the housing of the battery pack 1100. The gas flows through the free volume FV and can be exhausted to the underside of the vehicle through a gas exhaust port provided in the battery pack 1100. Furthermore, according to this embodiment, the free volume FV is provided between the battery cell assembly 100 and the housing within the battery pack 1100, preventing damage to the battery cell assembly 100 even if the housing is deformed.

[0063] According to the embodiment of the present invention, the battery pack 1100 and the electric vehicle 1000 including the battery pack 1100 can enhance passenger safety, protect the battery cell assembly 100, which is a core component, and improve the durability of the battery pack 1100 and the electric vehicle 1000.

[0064] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations shown in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, at the time of filing this application, there may be various equivalents and modifications that can replace them.

Claims

1. a cell block including a plurality of battery cells; a bus bar connected to the electrode lead of the cell block; a bus bar frame on which the bus bar is mounted and which has an accommodation space for accommodating a portion of the bus bar; a thermally conductive filler at least partially filling the accommodating space of the bus bar frame and in contact with the bus bar.

2. The battery cell assembly of claim 1 , further comprising a cooling plate on the cell block and in contact with the thermally conductive filler.

3. the bus bar frame includes a slit on a lower side of the accommodating space and an opening on an upper side of the accommodating space, the bus bar is inserted into the accommodation space of the bus bar frame through the slit of the bus bar frame, The battery cell assembly according to claim 2 , wherein the first portion of the cooling plate is inserted into the accommodating space of the bus bar frame through the opening of the bus bar frame.

4. The battery cell assembly of claim 3 , wherein at least a portion of the first portion of the cooling plate is embedded in the thermally conductive filler.

5. the cooling plate is coupled to an upper surface of the cell block; The battery cell assembly of claim 2 , wherein the bus bar frame is coupled to one side of the cell block.

6. further comprising another bus bar connected to another electrode lead of the cell block; The battery cell assembly according to any one of claims 1 to 4, wherein the thermally conductive filler is in contact with the other bus bar.

7. The thermally conductive filler is a first layer of material comprising silicone; a second material layer laminated on the first material layer, the second material layer including a thermally conductive resin;

8. 5. The battery cell assembly of claim 1, wherein the bus bar is an inter-bus bar connecting different electrode leads of the cell block to each other or a terminal bus bar electrically connected to an external electrical device.

9. A pack housing; a plurality of battery cell assemblies mounted in the pack housing and arranged in a first direction; Each of the plurality of battery cell assemblies comprises: a cell block including a plurality of battery cells; a cooling plate on the cell block; a plurality of bus bars connected to different electrode leads of the cell block; a bus bar frame including a lower portion on which the plurality of bus bars are mounted and an upper portion having an accommodation space that accommodates a portion of each of the plurality of bus bars and a first portion of the cooling plate; a thermally conductive filler configured to at least partially fill the accommodating space of the bus bar frame and to be in contact with the plurality of bus bars and the cooling plate to thermally couple the plurality of bus bars to the cooling plate.

10. the bus bar frame includes a plurality of slits on a lower side of the accommodating space and an opening on an upper side of the accommodating space, the plurality of bus bars are inserted into the accommodation space of the bus bar frame through corresponding slits among the plurality of slits, The battery pack according to claim 9 , wherein the first portion of the cooling plate is inserted into the accommodation space of the bus bar frame through the opening of the bus bar frame.

11. The plurality of bus bars are arranged in a first direction, 11. The battery pack according to claim 9, wherein the first portion of the cooling plate extends continuously in the first direction and is in continuous contact with the thermally conductive filler.

12. the cooling plate is coupled to an upper surface of the cell block; The battery pack according to claim 9 or 10, wherein the bus bar frame is coupled to one side of the cell block.

13. a lower housing that houses the plurality of battery cell assemblies; a top plate coupled to the lower housing to cover the plurality of battery cell assemblies, The battery pack according to claim 9 or 10, wherein the plurality of battery cell assemblies are supported by hanging from the top plate.

14. 14. The battery pack according to claim 13, wherein the plurality of battery cell assemblies are spaced apart from a bottom wall of the lower housing, and a space is formed between each of the plurality of battery cell assemblies and the bottom wall of the lower housing.

15. The battery pack according to claim 9 or 10, wherein each of the plurality of battery cell assemblies includes a cell block in which pouch-type battery cells are stacked.

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