Battery pack and automobile including the same

Abstract

To provide a battery pack and an automobile including the same that can improve energy density while ensuring rigidity.SOLUTION: A battery pack according to an embodiment of the present invention includes a battery cell assembly including a plurality of battery cells, a bus bar assembly provided on an upper side of the battery cell assembly, a heat sink disposed a predetermined distance away from the bus bar assembly and supporting lower ends of the plurality of battery cells, and a thermally conductive member filling a space between the plurality of battery cells above the heat sink.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a battery pack and a vehicle including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2021-0003548 filed on January 11, 2021, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] Secondary batteries, which have high applicability for each product group and electrical properties such as high energy density, are universally used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) that are driven by electrical sources. These secondary batteries are attracting attention as a new energy source for improving energy efficiency, not only for their primary advantage of dramatically reducing the use of fossil fuels, but also for their environmental friendliness in that they do not produce any by-products from the use of energy.

[0004] Currently, secondary batteries such as lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries are widely used. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, a battery pack may be configured by connecting a plurality of battery cells in parallel according to a charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge / discharge capacity.

[0005] Meanwhile, when constructing a battery pack by connecting a plurality of battery cells in series / parallel, a common method is to first construct a battery module including at least one battery cell, and then add other components to the at least one battery module to construct a battery pack or a battery rack.

[0006] A conventional battery pack generally includes a plurality of battery cells, a heat sink for cooling the plurality of battery cells, and a cell frame that houses the plurality of battery cells and the heat sink. The conventional cell frame generally includes an assembly of a plurality of plates, such as a front plate, a rear plate, a side plate, a lower plate, and an upper plate, for housing the plurality of battery cells and ensuring rigidity.

[0007] However, in the case of conventional battery packs, the cell frame structure formed by assembling a plurality of plates increases manufacturing costs, complicates the assembly process, and is disadvantageous in terms of price competitiveness and manufacturing efficiency.

[0008] Furthermore, in the case of a conventional battery pack, since the battery pack has a cell frame structure formed by an assembly of a plurality of plates, the overall size of the battery pack increases, which is disadvantageous in terms of energy density. Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide a battery pack that can improve energy density while ensuring rigidity, and a vehicle including the battery pack.

[0010] Another object of the present invention is to provide a battery pack and an automobile including the same that can improve price competitiveness and manufacturing efficiency.

[0011] It is yet another object of the present invention to provide a battery pack and an automobile including the same that can improve cooling performance. [Means for solving the problem]

[0012] In order to achieve the above object, the present invention provides a battery pack including: a battery cell assembly including a plurality of battery cells; a bus bar assembly provided on an upper side of the battery cell assembly and electrically connected to the plurality of battery cells; a heat sink disposed a predetermined distance away from the bus bar assembly and supporting lower ends of the plurality of battery cells; and a thermally conductive member filling a space between the plurality of battery cells above the heat sink.

[0013] The thermally conductive member may fill the bus bar assembly so as to at least partially cover the bus bar assembly.

[0014] The thermally conductive member may be continuously filled between the bus bar assembly and the battery cells in a vertical direction of the battery cell assembly.

[0015] The thermally conductive member may include a potting resin.

[0016] The potting resin may include a silicone resin.

[0017] The heat sink may include a sink body supporting lower ends of the plurality of battery cells and having a cooling passage therein for the flow of coolant, a coolant inlet port provided in the sink body and communicating with the cooling passage of the sink body, and a coolant outlet port provided in the sink body and spaced a predetermined distance from the coolant inlet port.

[0018] The bus bar assembly may include a pair of main bus bars electrically connected to the battery cell assemblies and equipped with connectors connected to external charge / discharge lines, and a plurality of connecting bus bars electrically connected to the pair of main bus bars and connected to positive and negative electrodes of the plurality of battery cells.

[0019] The pair of main bus bars may be electrically connected to battery cells disposed on both sides of an outermost edge of the battery cells of the battery cell assembly.

[0020] The plurality of connecting bus bars may be disposed spaced apart from each other by a predetermined distance along a longitudinal direction of the battery cell assembly.

[0021] The plurality of connecting bus bars may include a bus bar layer formed to a predetermined length along a width direction of the battery cell assembly and electrically connected to positive and negative electrodes of the battery cells, and a support layer provided on a bottom of the bus bar layer and supporting the bus bar layer.

[0022] The busbar layer may include a layer body formed with a predetermined length along a width direction of the battery cell assembly, and a plurality of electrode connectors protruding from the layer body and connected to positive and negative electrodes of the battery cells.

[0023] The support layer may be provided at the bottom of the layer body and may have a shape corresponding to the layer body.

[0024] The support layer may include an insulating material.

[0025] The support layer may include a polyimide film.

[0026] The present invention also provides a motor vehicle, comprising at least one battery pack as described above. Effect of the Invention

[0027] According to the present invention, it is possible to provide a battery pack that can improve energy density while ensuring rigidity, and a vehicle including the battery pack.

[0028] Furthermore, according to the present invention, it is possible to provide a battery pack and an automobile including the same that can improve price competitiveness and manufacturing efficiency.

[0029] Furthermore, according to the present invention, it is possible to provide a battery pack capable of improving cooling performance and a vehicle including the same.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters described in the drawings. [Brief description of the drawings]

[0031] [Figure 1] 1 is a diagram illustrating a battery pack according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an exploded perspective view of the battery pack of FIG. 1. [Diagram 3] 3 is a diagram for explaining a battery cell included in the battery cell assembly shown in FIG. 2. [Figure 4] 11A and 11B are diagrams illustrating another embodiment of a battery cell included in a battery cell assembly. [Diagram 5] FIG. 3 is an exploded perspective view of the busbar assembly shown in FIG. 2. [Figure 6] FIG. 6 is a perspective view of the coupling bus bar shown in FIG. 5. [Figure 7] FIG. 7 is an exploded perspective view of the coupling bus bar shown in FIG. 6. [Figure 8] 6 is a perspective view showing another embodiment of the coupling bus bar shown in FIG. 5. FIG. [Figure 9] 9 is a diagram for explaining a main part of the coupling bus bar shown in FIG. 8. [Figure 10] FIG. 3 is a perspective view of the heat sink shown in FIG. 2. [Figure 11] FIG. 3 is a perspective view of the bottom frame shown in FIG. 2. [Figure 12] 13A to 13C are diagrams illustrating another embodiment of the bottom frame. [Figure 13] 13A to 13C are diagrams illustrating another embodiment of the bottom frame. [Figure 14] 2 is a diagram for explaining the formation of a pack case through a thermal conductive member of the battery pack shown in FIG. 1. FIG. [Figure 15] 2 is a diagram for explaining the formation of a pack case through a thermal conductive member of the battery pack shown in FIG. 1. FIG. [Figure 16] FIG. 11 is a diagram illustrating a vehicle according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The present invention will be more clearly understood by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings. The following embodiments are illustrative and are intended to aid in the understanding of the invention, and it should be understood that the present invention can be practiced in various modified forms from the following embodiments. In addition, the accompanying drawings may be drawn not to scale, and some components may be exaggerated in size to aid in the understanding of the invention.

[0033] FIG. 1 is a diagram for explaining a battery pack according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the battery pack of FIG.

[0034] 1 and 2, a battery pack 10 may be installed in an electric vehicle or a hybrid vehicle as an energy source. Hereinafter, the battery pack 10 installed in an electric vehicle or the like will be described in more detail with reference to the related drawings.

[0035] The battery pack 10 includes a battery cell assembly 100, a bus bar assembly 200, a heat sink 300, and a thermally conductive member 400.

[0036] The battery cell assembly 100 may include at least one battery cell 150. Hereinafter, in this embodiment, the battery cell assembly 100 will be described as including a plurality of battery cells 150.

[0037] The battery cells 150 may be cylindrical secondary batteries, pouch-type secondary batteries, or prismatic secondary batteries. Hereinafter, in this embodiment, the battery cells 150 will be described as being cylindrical secondary batteries.

[0038] The plurality of battery cells 150 may be stacked so as to be electrically connected to each other. The plurality of battery cells 150 may be provided with a positive electrode 175 and a negative electrode 170 together at an upper end portion of the battery cells 150. Specifically, the positive electrode 175 of the battery cell 150 may be provided at the center of the upper end portion of the battery cell 150, and the negative electrode 170 of the battery cell 150 may be provided at the periphery of the upper end portion of the battery cell 150.

[0039] In this embodiment, the positive electrode 175 and the negative electrode 170 of the plurality of battery cells 150 are all provided on one side (+Z-axis direction) of the battery cell 150, specifically, on the upper side (+Z-axis direction) of the battery cell 150, so that electrical connection with the busbar assembly 200 described below may be made easier.

[0040] As a result, in this embodiment, since the positive electrodes 175 and the negative electrodes 170 of the plurality of battery cells 150 are both arranged in the same direction (+Z-axis direction), the connection structure with the busbar assembly 200 described below can be further simplified compared to a structure in which the positive electrodes 175 and the negative electrodes 170 are arranged on both sides in opposite directions, and the volume occupied by such an electrical connection structure can also be reduced.

[0041] Therefore, in this embodiment, the electrical connection structure between the battery cells 150 and the bus bar assembly 200 described below can be simplified, thereby realizing a compact structure of the battery pack 10 and an improvement in energy density.

[0042] Hereinafter, each of the plurality of battery cells 150 will be described in more detail.

[0043] FIG. 3 is a diagram for explaining a battery cell included in the battery cell assembly shown in FIG.

[0044] 3, the battery cell 150 includes an electrode assembly 160, a battery can 170, and a top cap 175. The battery cell 150 may further include an airtight gasket 180, a current collecting plate 185, an insulating plate 190, and a connecting plate 195 in addition to the above-mentioned components.

[0045] The electrode assembly 160 includes a first electrode plate having a first polarity, a second electrode plate having a second polarity, and a separator interposed between the first and second electrode plates. The electrode assembly 160 may be in the form of a jelly roll. That is, the electrode assembly 160 may be manufactured by sequentially stacking a first electrode plate, a separator, and a second electrode plate at least once, and winding the stacked body around a winding center C. In this case, a separator may be provided on an outer circumferential surface of the electrode assembly 160 for insulation from the battery can 170. The first electrode plate corresponds to a positive electrode plate or a negative electrode plate, and the second electrode plate corresponds to an electrode plate having an opposite polarity to the first electrode plate.

[0046] The first electrode plate includes a first electrode collector and a first electrode active material coated on one or both sides of the first electrode collector. An uncoated portion where the first electrode active material is not coated exists at one end of the first electrode collector in the width direction (direction parallel to the Z axis). The uncoated portion functions as a first electrode tab 162. The first electrode tab 162 is provided at an upper portion in the height direction (direction parallel to the Z axis) of the electrode assembly 160 accommodated in the battery can 170.

[0047] The second electrode plate includes a second electrode collector and a second electrode active material coated on one or both sides of the second electrode collector. An uncoated portion where the second electrode active material is not coated exists at the other end of the second electrode collector in the width direction (direction parallel to the Z axis). The uncoated portion functions as a second electrode tab 164. The second electrode tab 164 is provided at the lower part in the height direction (direction parallel to the Z axis) of the electrode assembly 160 accommodated in the battery can 170.

[0048] The battery can 170 is a cylindrical container having an opening at the top and made of a conductive metal material, and accommodates the electrode assembly 160 through the opening at the top, together with an electrolyte.

[0049] The battery can 170 is electrically connected to the second electrode tab 164 of the electrode assembly 160. Therefore, the battery can 170 has the same polarity as the second electrode tab 164. In this embodiment, the battery can 170 may function as the negative electrode 170.

[0050] The battery can 170 includes a beading portion 171 and a crimping portion 172 formed at an upper end thereof. The beading portion 171 is formed on an upper portion of the electrode assembly 160. The beading portion 171 is formed by pressing an outer circumferential surface of the battery can 170. The beading portion 171 prevents the electrode assembly 160, which has a size corresponding to the width of the battery can 170, from slipping out of the upper opening of the battery can 170, and may function as a support on which a top cap 175 is placed.

[0051] An upper peripheral edge 173 of the beading portion 171 of the battery can 170 may be fitted into or disposed in contact with a guide groove 249 of a negative electrode connecting portion 248 of a bus bar assembly 200 described below. This is to facilitate a welding process for electrical connection between the bus bar assembly 200 described below and the battery can 170 functioning as the negative electrode 170.

[0052] The crimping portion 172 is formed on the upper portion of the beading portion 171. The crimping portion 172 is extended and bent to surround the outer circumferential surface of a top cap 175 disposed on the beading portion 171 and a part of the upper surface of the top cap 175.

[0053] The top cap 175 is a component including a conductive metal material, and covers an upper opening of the battery can 170. The top cap 175 is electrically connected to a first electrode tab 162 of the electrode assembly 160 and is electrically insulated from the battery can 170. Therefore, the top cap 175 may function as a positive electrode 175 of the battery cell 150.

[0054] The top cap 175 is placed on a beading portion 171 formed on the battery can 170 and fixed by a crimping portion 172. An airtight gasket 180 may be interposed between the top cap 175 and the crimping portion 172 of the battery can 170 to ensure airtightness of the battery can 170 and to provide electrical insulation between the battery can 170 and the top cap 175.

[0055] The top cap 175 may have a protrusion protruding upward from the center thereof, which may be a guide for facilitating contact with an electrical connection component such as a bus bar.

[0056] The current collecting plate 185 is coupled to an upper portion of the electrode assembly 160. The current collecting plate 185 is made of a conductive metal material and is connected to the first electrode tab 162. A lead 187 is connected to the current collecting plate 185, and the lead 187 extends above the electrode assembly 160 and may be directly coupled to the top cap 175 or may be coupled to a connection plate 195 coupled to the lower surface of the top cap 175.

[0057] The current collecting plate 185 is coupled to an end of the first electrode tab 162. The coupling between the first electrode tab 162 and the current collecting plate 185 may be performed, for example, by laser welding. The laser welding may be performed in a manner that partially melts the base material of the current collecting plate 185, or may be performed in a state where solder for welding is interposed between the current collecting plate 185 and the first electrode tab 162. In this case, the solder may have a lower melting point than the current collecting plate 185 and the first electrode tab 162.

[0058] The current collecting plate 185 may also be coupled to the lower surface of the electrode assembly 160. In this case, one surface of the current collecting plate 185 may be coupled to the second electrode tab 164 of the electrode assembly 160 by welding, and the other surface may be coupled to the inner bottom surface of the battery can 170 by welding. The coupling structure between the current collecting plate 185 coupled to the lower surface of the electrode assembly 160 and the second electrode tab 164 is substantially the same as that of the current collecting plate 185 coupled to the upper surface of the electrode assembly 160 described above.

[0059] The insulating plate 190 is disposed between the upper end of the electrode assembly 160 and the beading portion 171, or between the current collecting plate 185 coupled to the upper portion of the electrode assembly 160 and the beading portion 171, to prevent contact between the first electrode tab 162 and the battery can 170 or between the current collecting plate 185 and the battery can 170.

[0060] The insulating plate 190 has a lead hole 193 through which a lead 187 extending upward from the current collecting plate 185 or the first electrode tab 162 is drawn out. The lead 187 is drawn out upward through the lead hole 193 and coupled to the lower surface of a connection plate 195 or the lower surface of a top cap 175.

[0061] As described above, the battery cell 150 according to an embodiment of the present invention has a structure in which the top cap 175 provided on the upper side and the upper peripheral edge 173 of the battery can 170 can be used as the positive electrode 175 and the negative electrode 170, respectively, in the longitudinal direction of the battery can 170 (direction parallel to the Z-axis in FIG. 2). Therefore, when multiple battery cells 150 according to an embodiment of the present invention are electrically connected, electrical connection parts such as the bus bar assembly 200 can be disposed on only one side of the battery cell 150, thereby simplifying the structure and improving the energy density.

[0062] FIG. 4 is a diagram for explaining another embodiment of a battery cell included in a battery cell assembly.

[0063] Since the battery cell 155 according to this embodiment is similar to the battery cell 150 according to the above-mentioned embodiment, a duplicated description of the configuration that is substantially the same or similar to the above-mentioned embodiment will be omitted, and the following description will focus on the differences from the above-mentioned embodiment.

[0064] Referring to FIG. 4 , in addition to the configuration of the battery cell 150 described above, the battery cell 155 may further include a metal washer 197 and an insulating washer 199 .

[0065] The metal washer 197 is made of a conductive metal material and is a substantially disk-shaped part having a hole in the center thereof. The metal washer 197 is coupled onto the crimping portion 172 of the battery can 170. The coupling between the metal washer 197 and the crimping portion 172 may be performed by, for example, laser welding.

[0066] The metal washer 197 is electrically insulated from the top cap 175. The top cap 175 is exposed through a hole formed in the center of the metal washer 197, and the metal washer 197 and a protrusion formed in the center of the top cap 175 are spaced apart from each other. In addition, the metal washer 197 is vertically spaced apart from other parts of the top cap 175 except for the protrusion. Therefore, the metal washer 197 is electrically connected to the second electrode tab 164 and the battery can 170, and can function as a negative electrode of the battery cell 155.

[0067] The width D2 of the metal washer 197 is formed to be wider than the width D1 of the upper surface of the crimping portion 172 of the battery can 170. This is to increase the bonding area between the electrical connection parts and the metal washer 197 when the electrical connection parts, such as the bus bar assembly 200, are bonded to the metal washer 197 to connect a plurality of battery cells 155. As the bonding area between the electrical connection parts and the metal washer 197 is increased in this manner, the welding process can be performed smoothly, the fastening force between the two parts can be improved, and the electrical resistance at the bonding site can be reduced.

[0068] The insulating washer 199 is interposed between the top cap 175 and the metal washer 197. The insulating washer 199 includes an insulating material. In the battery cell 155 according to an embodiment of the present invention, the top cap 175 functions as a positive electrode and the metal washer 197 functions as a negative electrode, so that the top cap 175 and the metal washer 197 must maintain an electrical insulated state. Therefore, it is advantageous to use the insulating washer 199 in order to stably maintain such an insulating state.

[0069] The insulating washer 199 is interposed between the lower surface of the metal washer 197 and the top cap 175. As described above, the metal washer 197 has a width D2 wider than the width D1 of the upper surface of the crimping portion 172, and extends from the crimping portion 172 toward the protruding portion of the center of the top cap 175. Therefore, the insulating washer 199 may extend to cover the inner surface of the hole formed in the center of the metal washer 197 so that the inner surface of the hole formed in the center of the metal washer 197 does not come into contact with the protruding portion of the top cap 175.

[0070] When the insulating washer 199 includes a resin material, the insulating washer 199 may be coupled to the metal washer 197 and the top cap 175 by thermal fusion. In this case, the airtightness at the coupling interface between the insulating washer 199 and the metal washer 197 and the coupling interface between the insulating washer 199 and the top cap 175 may be enhanced.

[0071] Hereinafter, the bus bar assembly 200 for electrically connecting the plurality of battery cells 150 will be described in more detail.

[0072] 5 is an exploded perspective view of the busbar assembly shown in FIG. 2, FIG. 6 is a perspective view of the coupling busbar shown in FIG. 5, and FIG. 7 is an exploded perspective view of the coupling busbar shown in FIG.

[0073] 5 to 7, the bus bar assembly 200 may be provided on an upper side (+Z-axis direction) of the battery cell assembly 100 and may be electrically connected to the plurality of battery cells 150. The electrical connection of the bus bar assembly 200 may be a parallel and / or series connection.

[0074] Such a busbar assembly 200 may be electrically connected to the positive electrode 175 (see FIG. 2) and the negative electrode 170 (see FIG. 2) of the plurality of battery cells 150 (see FIG. 2), and may be electrically connected to external charge / discharge lines, etc., through connectors 260, 270, etc.

[0075] The configuration of the busbar assembly 200 will now be described in more detail.

[0076] The bus bar assembly 200 may include a pair of main bus bars 210 , 220 , a connecting bus bar 230 , a pair of connectors 260 , 270 , and an interconnection board 280 .

[0077] The pair of main bus bars 210, 220 may include connectors 260, 270 electrically connected to the battery cell assembly 100 and connected to external charge / discharge lines.

[0078] The pair of main bus bars 210, 220 may be electrically connected to the battery cells 150 arranged on both sides of the outermost edge of the battery cells 150 of the battery cell assembly 100. Specifically, the pair of main bus bars 210, 220 may be electrically connected to the battery cells 150 arranged on the outermost edges in the front-rear direction (X-axis direction) of the battery cell assembly 100, respectively.

[0079] The pair of main busbars 210 , 220 may include a main positive busbar 210 and a main negative busbar 220 .

[0080] The main positive electrode bus bar 210 may be disposed at the rear (-X axis direction) of the bus bar assembly 200 on the upper side (+Z axis direction) of the battery cell assembly 100. The main positive electrode bus bar 210 may be electrically connected to the positive electrode 175 of the battery cell 150 disposed at the rear (-X axis direction) of the outermost edge of the battery cell assembly 100. The electrical connection may be performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0081] A positive connector 260 (described later) for connection to the charge / discharge line may be provided on the main positive bus bar 210. The positive connector 260 may protrude from the rear of the main positive bus bar 210 (in the -X-axis direction).

[0082] An interconnection board connector 215 for electrical connection to an interconnection board 280, which will be described later, may be provided at one end (+Y-axis direction) of the main positive bus bar 210. The interconnection board connector 215 may be connected to the interconnection board 280 via screw connection, rivet connection, or the like.

[0083] The main negative electrode bus bar 220 may be disposed in front of the bus bar assembly 200 (+X-axis direction) on the upper side (+Z-axis direction) of the battery cell assembly 100. The main negative electrode bus bar 220 may be electrically connected to the negative electrode 170 of the battery cell 150 disposed in the front (+X-axis direction) of the outermost periphery of the battery cell assembly 100. The electrical connection may be performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0084] A negative connector 270 (described later) for connection to the charge / discharge line may be provided on the main negative bus bar 220. The negative connector 270 may protrude from the front of the main negative bus bar 220 (in the +X-axis direction).

[0085] An interconnection board connection part 225 for electrical connection to an interconnection board 280 described below may be provided at one end (+Y-axis direction) of the main negative bus bar 220. The interconnection board connection part 225 may be connected to the interconnection board 280 via screw connection, rivet connection, or the like.

[0086] The connecting bus bar 230 may be provided in a plurality to electrically connect the battery cells 150. The connecting bus bars 230 may be electrically connected to the pair of main bus bars 210 and 220 and connected to the positive electrode 175 and the negative electrode 170 of the battery cells 150.

[0087] The plurality of connecting bus bars 230 may be disposed at a predetermined distance from each other along the longitudinal direction (X-axis direction) of the battery cell assembly 100. Furthermore, the plurality of connecting bus bars 230 may be disposed between the main positive bus bar 210 and the main negative bus bar 220 in the front-rear direction (X-axis direction) of the bus bar assembly 200.

[0088] Each of the plurality of connecting bus bars 230 may include a bus bar layer 240 and a support layer 250 .

[0089] The bus bar layer 240 may be formed to a predetermined length along the width direction (Y-axis direction) of the battery cell assembly 100 and may be electrically connected to the positive electrode 175 and the negative electrode 170 of the battery cell 150.

[0090] Such a bus bar layer 240 may include a layer body 242, an interconnection board connection portion 245, and electrode connections 246, 248.

[0091] The layer body 242 may be formed to have a predetermined length along the width direction (Y-axis direction) of the battery cell assembly 100. The layer body 242 may be provided in a shape corresponding to the arrangement structure of the battery cells 150 in the width direction of the battery cell assembly 100 for electrical connection with the battery cells 150.

[0092] The layer body 242 may be made of a conductive material. For example, the layer body 242 may be made of a metal material, such as aluminum or copper. However, the layer body 242 may be made of other materials for electrical connection.

[0093] The interconnection board connector 245 is provided at one end (+Y-axis direction) of the layer body 242 and may be electrically connected to an interconnection board 280 described below. The interconnection board connector 245 may be connected to the interconnection board 280 through screw connection, rivet connection, or the like.

[0094] The electrode connectors 246, 248 may protrude from the layer body 242 and be connected to the positive electrode 175 and the negative electrode 170 of the battery cell 150. Specifically, the electrode connectors 246, 248 may include a positive electrode connector 246 and a negative electrode connector 248.

[0095] The positive electrode connectors 246 may be provided in multiple numbers, protrude forward (in the +X-axis direction) of the layer body 242 by a predetermined size, and be spaced apart from each other by a predetermined distance along the longitudinal direction (Y-axis direction) of the layer body 242.

[0096] The plurality of positive electrode connectors 246 may be electrically connected to the positive electrodes 175 of the battery cells 150 of the battery cell assembly 100 disposed below (in the -Z axis direction) the bus bar assembly 200. The electrical connection may be performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0097] The negative electrode connectors 248 may be provided in plurality, protrude toward the rear (-X-axis direction) of the layer body 242 by a predetermined size, and be spaced apart from each other by a predetermined distance along the longitudinal direction (Y-axis direction) of the layer body 242. The negative electrode connectors 248 may be arranged in a zigzag pattern with the positive electrode connectors 246 in the longitudinal direction (Y-axis direction) of the layer body 242.

[0098] The negative electrode connectors 248 may be electrically connected to the negative electrodes 170 of the battery cells 150 of the battery cell assembly 100 disposed below (in the -Z-axis direction) the bus bar assembly 200. The electrical connection may be performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0099] The negative electrode connectors 248 may each be provided with a guide groove 249. The guide groove 249 may have a groove shape corresponding to the arc shape of an upper peripheral edge 173 of a battery can 170 (see FIG. 3) forming the negative electrode of the battery cell 150. The guide groove 249 is fitted into or comes into close contact with the upper peripheral edge 173 of the battery cell 150 during a welding process for electrically connecting the battery cell 150 to the negative electrode 170, thereby further ensuring the ease of the welding process and improving the accuracy of the welding process.

[0100] The support layer 250 is provided on the bottom (-Z axis direction) of the bus bar layer 240 and can support the bus bar layer 240. Such a support layer 250 can have a shape corresponding to the layer body 242 and can be fixed in contact with the bottom (-Z axis direction) of the layer body 242.

[0101] The support layer 250 may be made of an insulating material to prevent short circuits between the battery cells 150 and the bus bar layer 240. For example, the support layer 250 may include a polyimide film. However, the support layer 250 is not limited thereto, and may of course include other insulating members made of insulating materials.

[0102] An interconnection board connection part 255 may be provided at one end (+Y-axis direction) of the support layer 250. The interconnection board connection part 255 may be provided at a position corresponding to the interconnection board connection part 245 of the layer body 242, and may be electrically connected to an interconnection board 280, which will be described later. The interconnection board connection part 255 may be connected to the interconnection board 280 through screw connection, rivet connection, etc.

[0103] The pair of connectors 260, 270 are for connection to an external charge / discharge line and may include a positive connector 260 and a negative connector 270. The positive connector 260 may protrude from the rear of the main positive busbar 210 (in the -X-axis direction), and the negative connector 270 may protrude from the front of the main negative busbar 220 (in the +Z-axis direction).

[0104] The interconnection board 280 is for sensing the voltage of the battery cell 150 of the battery cell assembly 100, and may be formed to have a predetermined length in the longitudinal direction (X-axis direction) of the bus bar assembly 200.

[0105] Specifically, the interconnection board 280 measures the voltage across the battery cells 150 connected in parallel among the battery cells 150 of the battery cell assembly 100, thereby enabling the state of charge of the battery cell assembly 100 to be confirmed.

[0106] Therefore, the interconnection board 280 may be electrically connected to an external sensing line and electrically connected to the main positive bus bar 210 , the main negative bus bar 220 , and the plurality of connecting bus bars 230 .

[0107] The interconnection board 280 may include a sensing connector 285 and a bus bar connection 287 .

[0108] The sensing connector 285 may be connected to the external sensing line and may be provided at one end (-X-axis direction) of the interconnection board 280. The sensing connector 285 may be provided to be exposed to the outside of the battery pack 10 for connection to the external sensing line. The external sensing line may connect the sensing connector 285 to a battery management system (not shown). The battery management system may determine the state of charge of the battery cells connected in parallel based on the voltages of the battery cells connected in parallel.

[0109] The bus bar connection parts 287 may be provided in plurality and may be arranged at a predetermined distance from each other along the longitudinal direction (X-axis direction) of the interconnection board 280. The bus bar connection parts 287 may be connected to the interconnection board connection part 215 of the main positive bus bar 210, the interconnection board connection part 225 of the main negative bus bar 220, and the interconnection board connection parts 245, 255 of the plurality of connection bus bars 230 by bolt connection, rivet connection, or the like.

[0110] Hereinafter, a connecting bus bar 230A according to another embodiment of the bus bar assembly 200 of the present invention will be described.

[0111] FIG. 8 is a perspective view showing another embodiment of the coupling bus bar shown in FIG. 5, and FIG. 9 is a view for explaining a main part of the coupling bus bar shown in FIG.

[0112] 8 and 9, the connecting bus bar 230A may include a bus bar cover 240A and a sub-bus bar 250A.

[0113] The bus bar cover 240A may be provided in a substantially flat plate shape to cover an upper side of the battery cell assembly 100. The shape and size of the bus bar cover 240A may vary depending on the number and capacity of the battery cells 150 required by the battery pack 10.

[0114] The bus bar cover 240A may be made of an insulating material. For example, the bus bar cover 240A may include a polyimide film. However, the bus bar cover 240A is not limited thereto, and may include other insulating members made of insulating materials.

[0115] The bus bar covers 240A may be provided in pairs and coupled to each other to have corresponding shapes and sizes in the vertical direction (Z-axis direction) of the battery pack 10. Here, a sub-bus bar 250A, which will be described later, may be a single layer and may be inserted between the pair of bus bar covers 240A.

[0116] Such a busbar cover 240A may include positive busbar holes 242A, negative busbar holes 244A, and fastening holes 246A.

[0117] The positive busbar hole 242A has an opening space of a predetermined size and may be provided in a plurality of pieces. A positive electrode connection part 254A described later may be exposed in the positive busbar hole 242A. Here, the positive busbar hole 242A may be formed to have an opening space larger than the size of the positive electrode connection part 254A described later in order to improve process operability and injection efficiency of the heat conduction member 400 described later.

[0118] The positive busbar hole 242A can more efficiently guide an electrical connection between a positive electrode connector 254A (described later) and a first electrode terminal 175 (see FIG. 3) which is the positive electrode of the battery cell 150.

[0119] Furthermore, when a thermally conductive member 400, which will be described later, is injected through the opening space of the positive busbar hole 242A, it is possible to significantly improve the injection efficiency of the thermally conductive member 400. Specifically, since the thermally conductive member 400 provided as a potting resin 400, which will be described later, can be directly injected from the upper side of the battery pack 10 downward in the vertical direction (Z-axis direction) through the opening space of the positive busbar hole 242A, it is possible to significantly improve the injection efficiency between the battery cells 150.

[0120] The negative busbar hole 244A is disposed opposite to the positive busbar hole 242A, has a predetermined size of opening space like the positive busbar hole 242A, and may be provided in plurality. Here, the negative busbar hole 244A may be formed to have an opening space larger than the size of a negative electrode connection part 256A to be described later in order to improve process operability and injection efficiency of a heat conduction member 400 to be described later.

[0121] The negative electrode bus bar hole 244A can more efficiently guide an electrical connection between a negative electrode connector 256A (to be described later) and a battery can 170 (see FIG. 3) which is the negative electrode of the battery cell 150.

[0122] Furthermore, when a thermally conductive member 400, which will be described later, is injected through the opening space of the negative busbar hole 244A, it is possible to significantly improve the injection efficiency of the thermally conductive member 400. Specifically, the thermally conductive member 400 provided as a potting resin 400, which will be described later, can be directly injected from the upper side of the battery pack 10 downward in the vertical direction (Z-axis direction) through the opening space of the negative busbar hole 244A, so that the injection efficiency between the battery cells 150 can be significantly improved.

[0123] The fastening holes 246A are provided in a plurality to more stably fix the connection bus bar 230A, and fastening members such as bolt members can be fastened to the fastening holes 246A.

[0124] The sub-busbar 250A is for electrical connection with the positive electrodes 175 and the negative electrodes 170 of the plurality of battery cells 150, and may be provided on the upper side of the busbar cover 240A or inserted into a pair of busbar covers 240A. Hereinafter, in this embodiment, the sub-busbar 250A will be described only as being inserted into the busbar cover 240A.

[0125] Such a sub-busbar 250A may include a busbar bridge 252A, a positive electrode connection portion 254A, and a negative electrode connection portion 256A.

[0126] The bus bar bridge 252A may be inserted into the bus bar cover 240A and formed to a predetermined length along the width direction (Y-axis direction) of the battery pack 10. The bus bar bridge 252A may be provided in a shape corresponding to an arrangement structure of the battery cells 150 in the width direction (Y-axis direction) of the battery pack 10 so as to improve the efficiency of electrical connection with the battery cells 150. Thus, in the present embodiment, the bus bar bridge 252A may be arranged in a zigzag shape in the width direction (Y-axis direction) of the battery pack 10.

[0127] A plurality of such bus bar bridges 252A may be provided. The plurality of bus bar bridges 252A may be inserted into the bus bar cover 240A and spaced apart from each other by a predetermined distance in the longitudinal direction (X-axis direction) of the battery pack 10.

[0128] The bus bar bridge 252A may be made of a conductive material. For example, the bus bar bridge 252A may be made of a metal material, such as aluminum or copper. However, the present invention is not limited thereto, and the bus bar bridge 252A may be made of other materials for electrical connection.

[0129] The positive electrode connector 254A may be integrally extended and protruded from the bus bar bridge 252A and disposed in the positive electrode bus bar hole 242A. The positive electrode connector 254A may be electrically connected to the positive electrode 175 (see FIG. 3 ) of the battery cell 150. The electrical connection may be performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0130] Since the connection between the positive electrode connector 254A and the positive electrode 175 of the battery cell 150 is performed in the open space of the positive electrode busbar hole 242A, a welding process for the connection can be performed immediately in the open space without any additional process during the connection.

[0131] The negative electrode connector 256A may be integrally extended from the busbar bridge 252A, protrude in a direction opposite to the positive electrode connector 254A, and be disposed in the negative electrode busbar hole 244A. The negative electrode connector 256A may be electrically connected to the negative electrode 170 (see FIG. 3) of the battery cell 150. The electrical connection may be made through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0132] The connection between the negative electrode connector 256A and the negative electrode 170 of the battery cell 150 is performed in the open space of the negative electrode busbar hole 244A, so that a welding process for the connection can be performed immediately in the open space without any additional process during connection.

[0133] 2, the heat sink 300 may be disposed at a predetermined distance from the bus bar assembly 200 and support lower ends (-Z axis direction) of the battery cells 150. The heat sink 300 may be provided on the lower side (-Z axis direction) of the battery cell assembly 100 and disposed on the lower part of the battery pack 10 (-Z axis direction).

[0134] The heat sink 300 will now be described in more detail.

[0135] FIG. 10 is a perspective view of the heat sink shown in FIG.

[0136] 10 and 2, the heat sink 300 may include a sink body 310, a coolant inlet port 330, and a coolant outlet port 350.

[0137] The sink body 310 may support lower ends (-Z axis direction) of the plurality of battery cells 150. A cooling passage for flowing coolant may be provided inside the sink body 310.

[0138] The sink body 310 may be fixed in contact with the lower ends (-Z axis direction) of the battery cells 150 through the thermal conductive member 400 including the resin material. However, without being limited thereto, the sink body 310 may be fixed in contact with the lower ends of the battery cells 150 through a separate fixing resin or adhesive.

[0139] In this embodiment, the electrode structure and electrical connection structure of the positive electrode 175 and the negative electrode 170 are formed only on the upper end (+Z-axis direction) of the battery cell 150, so that the lower end (-Z-axis direction) of the battery cell 150 can be in face contact with the sink body 310 to maximize the contact area.

[0140] Therefore, in this embodiment, through a surface-contact fixing structure between the lower end (-Z axis direction) of the battery cell 150 and the sink body 310, the cooling performance of the battery cell 150 can be further improved.

[0141] The coolant inlet port 330 may be provided in the sink body 310, communicating with a cooling passage of the sink body 310. Specifically, the coolant inlet port 330 may be provided in the front (-X axis direction) of the sink body 310, and disposed to be exposed to the outside of the battery pack 10 for connection to an external cooling line.

[0142] The coolant discharge port 350 may be provided in the sink body 310 to be spaced a predetermined distance from the coolant inlet port 330. Specifically, the coolant discharge port 350 may be provided in the front (-X-axis direction) of the sink body 310 and disposed to be exposed to the outside of the battery pack 10 for connection to an external cooling line.

[0143] 2, the heat conduction member 400 may be filled in the spaces between the battery cells 150 on the upper side (+Z-axis direction) of the heat sink 300. Meanwhile, in FIG. 2, the heat conduction member 400 is shown by a dotted line in a rectangular parallelepiped shape for ease of understanding, but the heat conduction member 400 may be filled in all of the spaces between the battery cells 150 on the upper side of the heat sink 300.

[0144] The thermally conductive member 400 may more stably fix the battery cells 150 and at the same time, may increase the heat dissipation efficiency of the battery cells 150, thereby further improving the cooling performance of the battery cells 150.

[0145] The thermal conductive member 400 may include a potting resin. The potting resin may be formed by injecting a thin resin material into the battery cells 150 and curing it. Here, the resin material may be injected at room temperature of about 15° C. to 25° C. to prevent thermal damage to the battery cells 150.

[0146] Specifically, the thermal conductive member 400 may include a silicone resin, but is not limited thereto, and the thermal conductive member 400 may include other resin materials capable of improving the fixing of the battery cells 150 and heat dissipation efficiency, in addition to the silicone resin.

[0147] The thermally conductive member 400 may be filled in the bus bar assembly 200 in addition to the battery cells 150. Specifically, the battery cells 150 may be filled in the bus bar assembly 200 so as to at least partially cover the bus bar assembly 200.

[0148] Here, the thermal conduction member 400 may be continuously filled between the bus bar assembly 200 and the battery cell 150 in the vertical direction (Z-axis direction) of the battery cell assembly 100 without any disconnected or separated space between the bus bar assembly 200 and the battery cell 150.

[0149] As described above, the thermal conduction member 400 according to the present embodiment is continuously filled between the battery cell 150 and the bus bar assembly 200 without any discontinuity, thereby realizing uniform heat dispersion without any variation in heat dispersion in the region between the battery cell 150 and the bus bar assembly 200, thereby significantly improving the cooling performance of the battery pack 10.

[0150] With further reference to FIG. 2 , the battery pack 10 may further include a bottom frame 500.

[0151] FIG. 11 is a perspective view of the bottom frame shown in FIG.

[0152] 11 and 2, the bottom frame 500 may support the battery cells 150 of the battery cell assembly 100 on the upper side (+Z-axis direction) of the heat sink 300.

[0153] Such a bottom frame 500 may include a bottom housing 510 , a cell insert 530 , and a cell guide rib 570 .

[0154] The bottom housing 510 is disposed on an upper side (+Z-axis direction) of the heat sink 300 and may at least partially accommodate the plurality of battery cells 150. The bottom housing 510 may ensure the rigidity of the battery pack 10 and more stably fix and support the battery cells 150.

[0155] The cell insertion portion 530 may be provided at a bottom (-Z axis direction) of the bottom housing 510, and a plurality of the cell insertion portions 530 may be provided. Lower ends (-Z axis direction) of the battery cells 150 may be inserted into the cell insertion portions 530.

[0156] The cell insertion portions 530 may be formed in a shape corresponding to the lower ends (-Z axis direction) of the battery cells 150, and may have an open shape in the vertical direction (Z axis direction) so that the lower ends (-Z axis direction) of the battery cells 150 contact the heat sink 300.

[0157] The cell guide rib 570 is for more stably fixing the battery cells 150 and may be provided between the cell insertion portions 530. A plurality of such cell guide ribs 570 may be provided and may be formed to protrude from the bottom surface of the bottom housing 510 (-Z axis direction) by a predetermined height (+Z axis direction).

[0158] Hereinafter, the formation of the pack case structure of the battery pack 10 according to the present embodiment will be described in more detail through the thermal conductive member 400. The process of injecting the thermal conductive member 400 for forming such a pack case structure may be performed after assembling the battery cell assembly 100, the bus bar assembly 200, the heat sink 300, and the bottom frame 500 of the battery pack 10 described above.

[0159] Hereinafter, a bottom frame 505 according to another embodiment of the battery pack 10 of the present invention will be described.

[0160] 12 and 13 are views for explaining another embodiment of the bottom frame of the battery pack shown in FIG.

[0161] 12 and 13, the bottom frame 505 may include a main plate 580 and an end plate 590 .

[0162] The main plate 580 may be formed to have a predetermined length along the width direction (Y-axis direction) of the battery pack 10 and may accommodate the battery cells 150 arranged in two rows in the length direction (X-axis direction) of the battery pack 10. A plurality of such main plates 580 may be provided and arranged at a predetermined distance from each other along the length direction (X-axis direction) of the battery pack 10.

[0163] The plurality of main plates 580 may be coupled to each other to form a cell insertion portion 530 for inserting the battery cell 150 and a cell guide rib 570 for guiding a stable fixation of the battery cell 150 .

[0164] In addition, the plurality of main plates 580 ensures the rigidity of the battery cells 150 and occupies a certain space in the battery pack 10 (see FIG. 2), thereby reducing the amount of heat conductive member 400 injected, which will be described later. Since the heat conductive member 400 containing a silicone resin, which will be described later, is relatively expensive, the plurality of main plates 580 can reduce the amount of silicone resin injected, thereby further ensuring price competitiveness when manufacturing the battery pack 10.

[0165] The plurality of main plates 580 may include a guide step 588 .

[0166] The guide steps 588 may be protruded at a predetermined height from both upper ends in the width direction (Y-axis direction) of the main plate 580. When the bottom frame 505 is assembled by combining the main plate 580 with an end plate 590 (to be described later), the guide steps 588 may form the periphery of the bottom frame 505 together with end guide steps 598 of an end plate 590 (to be described later).

[0167] The end plates 590 may be provided in a pair on both sides of the outermost edge in the longitudinal direction (X-axis direction) of the bottom frame 505. The pair of end plates 590 may accommodate and support the battery cells 150 together with the main plate 580 disposed opposite to each other.

[0168] The pair of end plates 590 may be provided with end guide steps 598 .

[0169] The end guide step 598 may be formed along an upper end of the end plate 590 and protrude at the same height as the guide step 588. The end guide step 598 may form the periphery of the bottom frame 505 together with the guide step 588 of the main plate 580 when the bottom frame 505 is assembled.

[0170] 14 and 15 are views for explaining the formation of a pack case structure through a thermal conductive member of the battery pack shown in FIG.

[0171] 14 and 15, when manufacturing the battery pack 10, an operator may assemble the battery cell assembly 100, the bus bar assembly 200, and the heat sink 300, and then inject and apply the thermal conductive member 400 using a resin injection device I, thereby forming a pack case of the battery pack 10 through the thermal conductive member 400 including the resin material.

[0172] At this time, in order to more smoothly inject and apply the thermal conductive member 400, after assembling the battery cell assembly 100, the bus bar assembly 200, and the heat sink 300, a form (not shown) for guiding the injection of the thermal conductive member 400 may be temporarily attached to the form. Here, the form may have a shape corresponding to the shape of the pack case, and may have a shape that exposes components connected to external devices, such as the positive connector 260, the negative connector 270, the sensing connector 285, and the coolant inlet port 330 and the coolant outlet port 350, to the outside.

[0173] When the thermally conductive member 400 hardens within the mold, the thermally conductive member 400 forms a pack case of the battery pack 10, after which an operator may remove the mold.

[0174] As a result, in this embodiment, since the pack case is formed through the thermally conductive member 400 including the potting resin, the assembly process of the battery pack 10 can be simplified compared to the conventional case in which a pack case is formed as a complex assembly of multiple plates, and the manufacturing cost can be significantly reduced, ensuring price competitiveness.

[0175] Furthermore, according to the present embodiment, the pack case structure formed with the thermal conductive member 400 can reduce the size of the entire battery pack 10 and significantly increase the energy density, compared to a conventional cell frame structure formed by an assembly of multiple plates.

[0176] FIG. 16 is a diagram for explaining a vehicle according to another embodiment of the present invention.

[0177] Referring to FIG. 16, the vehicle 1 may be an electric vehicle or a hybrid vehicle and may include at least one battery pack 10 as described above as an energy source.

[0178] In this embodiment, the above-mentioned battery pack 10 is provided in a compact structure having high energy density, so that when it is installed in an automobile 1, it is easy to realize a modular structure of multiple battery packs 10, and a relatively high degree of freedom in installation can be ensured even in the various shapes of internal spaces of the automobile 1.

[0179] According to the various embodiments described above, it is possible to provide a battery pack 10 capable of improving energy density and ensuring rigidity, and an automobile 1 including the battery pack 10.

[0180] In addition, through the various embodiments described above, it is possible to provide a battery pack 10 and an automobile 1 including the same that can improve price competitiveness and manufacturing efficiency.

[0181] Furthermore, through the various embodiments described above, it is possible to provide a battery pack 10 and an automobile 1 including the same that can improve cooling performance.

[0182] Although a preferred embodiment of the present invention has been illustrated and described above, the present invention is not limited to the above-mentioned specific embodiment, and various modifications may be made by a person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the claims, and such modifications should not be understood individually from the technical ideas and prospects of the present invention. [Explanation of symbols]

[0183] 10 Battery Pack 100 Battery Cell Assembly 150, 155 battery cells 170 Battery can (negative electrode) 175 Top cap (positive electrode, first electrode terminal) 200 Busbar Assembly 210 Main busbar (main positive busbar) 220 Main busbar (main negative busbar) 246 Positive electrode connection part (electrode connection part) 248 Negative electrode connection part (electrode connection part) 260 Positive connector (connector) 270 Negative connector (connector) 300 Heatsink 400 Potting resin (thermal conductive material)

Claims

1. a battery cell assembly including a plurality of battery cells; a bus bar assembly provided on an upper side of the battery cell assembly and electrically connected to the plurality of battery cells; a heat sink disposed at a predetermined distance from the bus bar assembly and supporting lower ends of the battery cells; a thermally conductive member filling spaces between the battery cells on an upper side of the heat sink; Including the battery pack.

2. The battery pack according to claim 1 , wherein the thermally conductive member is filled in the bus bar assembly so as to at least partially cover the bus bar assembly.

3. The battery pack according to claim 1 , wherein the thermally conductive member is filled continuously between the bus bar assembly and the battery cells in a vertical direction of the battery cell assembly.

4. The battery pack according to claim 1 , wherein the thermally conductive member includes a potting resin.

5. The battery pack according to claim 4 , wherein the potting resin includes a silicone resin.

6. The heat sink is a sink body supporting lower ends of the battery cells and having a cooling passage therein for the flow of cooling water; a cooling water inlet port provided in the sink body and communicating with the cooling passage of the sink body; a cooling water outlet port provided in the sink body and spaced a predetermined distance from the cooling water inlet port; The battery pack of claim 1 , comprising:

7. The bus bar assembly includes: A pair of main bus bars electrically connected to the battery cell assembly and equipped with connectors connected to external charge / discharge lines; a plurality of connecting bus bars electrically connected to the pair of main bus bars and connected to positive and negative electrodes of the plurality of battery cells; The battery pack of claim 1 , comprising:

8. The battery pack according to claim 7 , wherein the pair of main bus bars are electrically connected to battery cells arranged on both sides of an outermost edge of the battery cells of the battery cell assembly.

9. The battery pack according to claim 7 or 8, wherein the plurality of connecting bus bars are arranged at a predetermined distance apart from each other along a longitudinal direction of the battery cell assembly.

10. The plurality of connecting bus bars include a bus bar layer formed to a predetermined length along a width direction of the battery cell assembly and electrically connected to a positive electrode and a negative electrode of the battery cell; a support layer provided at a bottom of the busbar layer and supporting the busbar layer; 10. The battery pack of claim 7, comprising:

11. The busbar layer comprises: a layer body formed to a predetermined length along a width direction of the battery cell assembly; a plurality of electrode connectors protruding from the layer body and connected to positive and negative electrodes of the battery cells; 11. The battery pack of claim 10, comprising:

12. The battery pack according to claim 11 , wherein the support layer is provided at a bottom of the layer body and has a shape corresponding to the layer body.

13. 13. The battery pack of claim 12, wherein the support layer comprises an insulating material.

14. 14. The battery pack of claim 13, wherein the support layer comprises a polyimide film.

15. A motor vehicle comprising at least one battery pack according to any one of claims 1 to 14.

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