Battery pack and automobile including same

Abstract

A battery pack according to one 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 and electrically connected to the plurality of battery cells; a cooling unit disposed below the bus bar assembly and arranged between the plurality of battery cells along a longitudinal direction of the battery cell assembly; and a thermally conductive member filled in a space between the cooling unit and the plurality of battery cells.

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. 10-2021-0003551, filed on January 11, 2021, and all contents disclosed in the specification and drawings of that application are incorporated by reference into this application. [Background technology]

[0003] Secondary batteries, which have high applicability to various products and electrical properties such as high energy density, are widely 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 not only for their primary advantage of dramatically reducing the use of fossil fuels, but also for their environmental friendliness and the fact that they do not produce any by-products from the use of energy, as a new energy source that can increase energy efficiency.

[0004] Currently, the types of secondary batteries that are widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. 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 is configured by connecting a plurality of battery cells in series. Also, a battery pack is configured by connecting a number of battery cells in parallel according to the charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack can be variously set according to the 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 use this at least one battery module to add other components to construct a battery pack or a battery rack.

[0006] A conventional battery pack generally includes a plurality of battery cells and a cell frame that houses the plurality of battery cells. The conventional cell frame generally houses the plurality of battery cells and is configured as 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, in order to ensure rigidity, etc.

[0007] However, in the case of conventional battery packs, due to the characteristics of the cell frame structure formed by assembling a plurality of plates, manufacturing costs are increased and the assembly process is complicated, resulting in disadvantages in terms of cost competitiveness and manufacturing efficiency.

[0008] Furthermore, in the case of a conventional battery pack, the cell frame structure formed by assembling a plurality of plates increases the overall size of the battery pack, 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 ensure rigidity while increasing energy density, 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, which can improve cost competitiveness and manufacturing efficiency.

[0011] It is still another object of the present invention to provide a battery pack capable of improving cooling performance, and an automobile including the same. [Means for solving the problem]

[0012] In order to achieve the above object, the present invention provides a battery pack comprising: 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 cooling unit disposed on a lower side of the bus bar assembly and disposed between the plurality of battery cells along a longitudinal direction of the battery cell assembly; and a thermally conductive member filled in a space between the cooling unit and the plurality of battery cells.

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

[0014] The thermally conductive member is continuously filled between the bus bar assembly and the cooling unit in a vertical direction of the battery cell assembly.

[0015] The thermally conductive member may be made of a potting resin.

[0016] The cooling unit may include a cooling tube formed to a predetermined length along a longitudinal direction of the battery cell assembly, disposed between the plurality of battery cells, and having a cooling flow path therein for circulating coolant; and a coolant inlet / outlet part connected to the cooling tube so as to communicate with the cooling flow path of the cooling tube.

[0017] The cooling tubes may be formed to have a shape corresponding to outer surfaces of the plurality of opposing battery cells.

[0018] The cooling tube may be formed to have convex portions and concave portions alternately arranged along a longitudinal direction of the battery cell assembly.

[0019] The cooling water inlet / outlet may be provided on one side of the battery cell assembly along a longitudinal direction thereof, and the cooling tube may be formed to a predetermined length from the cooling water inlet / outlet to the other side of the battery cell assembly in the longitudinal direction of the battery cell assembly.

[0020] The cooling water inlet / outlet portion may be disposed between the plurality of battery cells in a longitudinal direction of the battery cell assembly, and the cooling tube may be formed to a predetermined length from the cooling water inlet / outlet portion toward both sides of the battery cell assembly in the longitudinal direction of the battery cell assembly.

[0021] The cooling flow passage may include at least one upper flow passage disposed above the cooling tube and formed to a predetermined length along the longitudinal direction of the cooling tube; at least one lower flow passage disposed below the cooling tube and spaced apart from the at least one upper flow passage and formed to a predetermined length along the longitudinal direction of the cooling tube; and a connecting flow passage connecting the at least one upper flow passage and the at least one lower flow passage.

[0022] The cooling water inlet / outlet part may include: an inlet / outlet part body connected to one end of the cooling tube; a cooling water supply port provided in the inlet / outlet part body and connected to communicate with the upper flow passage; and a cooling water discharge port provided in the inlet / outlet part body and connected to communicate with the lower flow passage.

[0023] The connecting passage may be provided at the other end of the cooling tube.

[0024] The cooling tube is disposed to contact outer surfaces of the plurality of battery cells.

[0025] 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 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.

[0026] The invention also provides a motor vehicle, characterized in that it includes at least one battery pack according to the above-described embodiment. Effect of the Invention

[0027] According to the various embodiments described above, it is possible to provide a battery pack capable of increasing energy density while ensuring rigidity, and a vehicle including the battery pack.

[0028] In addition, through the various embodiments described above, it is possible to provide a battery pack and a vehicle including the same that can improve cost competitiveness and manufacturing efficiency.

[0029] In addition, through the various embodiments described above, it is possible to provide a battery pack capable of improving cooling performance and a vehicle including the battery pack. [Brief description of the drawings]

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters shown in such drawings. [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. [Diagram 3] 3 is a diagram illustrating a battery cell of a battery cell assembly of the battery pack of FIG. 2. [Figure 4]4 is a diagram illustrating a battery cell according to another embodiment of the battery cell assembly of FIG. 3. [Diagram 5] FIG. 3 is a perspective view of a bus bar assembly of the battery pack of FIG. 2. [Figure 6] FIG. 6 is a perspective view of a connecting bus bar of the bus bar assembly of FIG. 5 . [Figure 7] FIG. 7 is an exploded perspective view of the coupling bus bar of FIG. 6. [Figure 8] 3 is a perspective view of a main part of a cooling unit of the battery pack of FIG. 2. [Figure 9] FIG. 9 is a cross-sectional view of a main part of the cooling unit of FIG. 8. [Figure 10] 13 is a view illustrating a cooling unit according to another embodiment of the present invention. [Figure 11] FIG. 3 is a perspective view of a bottom frame of the battery pack of FIG. 2. [Figure 12] FIG. 3 is a perspective view of a top frame of the battery pack of FIG. 2. [Figure 13] 13 is an enlarged view of a main part of the top frame of FIG. 12. [Figure 14] FIG. 14 is a plan view of the top frame of FIG. [Figure 15] 2 is a diagram illustrating an electrical connection between a battery cell assembly and a bus bar assembly of the battery pack of FIG. 1; [Figure 16] 2 is a diagram illustrating an electrical connection between a battery cell assembly and a bus bar assembly of the battery pack of FIG. 1; [Figure 17] 2 is a diagram illustrating the formation of a pack case structure through a thermal conductive member of the battery pack of FIG. 1. [Figure 18] 2 is a diagram illustrating the formation of a pack case structure through a thermal conductive member of the battery pack of FIG. 1. [Figure 19] 1 is a diagram illustrating a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The present invention will become more clear by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. The embodiments described herein are illustrative in order to aid in the understanding of the invention, and it should be understood that the present invention can be implemented in various forms different from the embodiments described herein. In addition, in order to aid in the understanding of the invention, the accompanying drawings are not drawn to scale, and the dimensions of some components may be exaggerated.

[0032] FIG. 1 is a diagram illustrating 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.

[0033] 1 and 2, a battery pack 10 is an energy source and may be provided in an electric vehicle or a hybrid vehicle. Hereinafter, the battery pack 10 provided in such an electric vehicle will be described in more detail with reference to the following related drawings.

[0034] The battery pack 10 may include a battery cell assembly 100, a bus bar assembly 200, a cooling unit 300, and a thermal conductive member 400.

[0035] The battery cell assembly 100 may include at least one or more battery cells 150. Hereinafter, in this embodiment, the battery cell assembly 100 will be described as including a plurality of battery cells 150.

[0036] The battery cells 150 are secondary batteries and may be cylindrical secondary batteries, pouch-type secondary batteries, or square-type secondary batteries. Hereinafter, in this embodiment, the battery cells 150 will be described as being cylindrical secondary batteries.

[0037] The plurality of battery cells 150 are stacked to be electrically connected to each other. The plurality of battery cells 150 may have a positive electrode 175 and a negative electrode 170 at their upper ends. Specifically, the positive electrode 175 of the battery cell 150 may be provided at the center of the upper end of the battery cell 150, and the negative electrode 170 of the battery cell 150 may be provided on a frame at the upper end of the battery cell 150.

[0038] In this embodiment, the positive electrode 175 and the negative electrode 170 of the plurality of battery cells 150 are both 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, making it easier to electrically connect to the bus bar assembly 200 described below.

[0039] As a result, in this embodiment, the positive electrodes 175 and the negative electrodes 170 of the plurality of battery cells 150 are all arranged in the same direction (+Z-axis direction), so that 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 in opposite directions, and the volume occupied by such an electrical connection structure can also be reduced.

[0040] Therefore, in this embodiment, the electrical connection structure between the battery cells 150 and the bus bar assembly 200 (described later) can be simplified, thereby making it possible to realize a compact structure of the battery pack 10 and improving the energy density.

[0041] Hereinafter, each of the plurality of battery cells 150 will be described in more detail.

[0042] FIG. 3 is a diagram illustrating a battery cell of a battery cell assembly of the battery pack of FIG.

[0043] 3, the battery cell 150 may include 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.

[0044] 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 have a jelly-roll shape. 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 is a positive electrode plate or a negative electrode plate, and the second electrode plate is an electrode plate having a polarity opposite to that of the first electrode plate.

[0045] 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.

[0046] 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 in the width direction (direction parallel to the Z axis) of the second electrode collector. 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.

[0047] The battery can 170 is a cylindrical container having an opening at the top and is made of a conductive metal material. The battery can 170 accommodates the electrode assembly 160 through the opening at the top, and also accommodates an electrolyte.

[0048] 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.

[0049] 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 around the outer periphery 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 through the upper opening of the battery can 170, and may function as a support on which a top cap 175 is placed.

[0050] An upper frame 173 of the beading portion 171 of the battery can 170 is inserted into or placed in contact with a guide groove 249 of a negative electrode connection portion 248 of a bus bar assembly 200, which will be described later. This is to facilitate a welding process for electrically connecting the battery can 170, which functions as the negative electrode 170, to the bus bar assembly 200, which will be described later.

[0051] The crimping portion 172 is formed on 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.

[0052] The top cap 175 is a part made of 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 can function as a positive electrode 175 of the battery cell 150.

[0053] 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 is 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 electrically insulate the battery can 170 from the top cap 175.

[0054] The top cap 175 may have a protrusion protruding upward from the center thereof, and the protrusion may be guided to facilitate contact with an electrical connection component such as a bus bar.

[0055] 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.

[0056] The current collecting plate 185 is coupled to an end of the first electrode tab 162. The first electrode tab 162 and the current collecting plate 185 may be coupled to each other by, for example, laser welding. The laser welding is performed by partially melting the base material of the current collecting plate 185, and may be performed by interposing solder for welding 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.

[0057] 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 opposite 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 and the second electrode tab 164 coupled to the lower surface of the electrode assembly 160 is substantially the same as that of the current collecting plate 185 coupled to the upper surface of the electrode assembly 160 described above.

[0058] The insulating plate 190 is disposed between the upper end of the electrode assembly 160 and the beading portion 171, or between a 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.

[0059] 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.

[0060] 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 in the longitudinal direction of the battery can 170 (direction parallel to the Z axis in FIG. 2) and the upper frame 173 of the battery can 170 can be used as the positive electrode 175 and the negative electrode 170, respectively. Therefore, when a plurality of 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, which can simplify the structure and improve the energy density.

[0061] FIG. 4 is a view illustrating a battery cell according to another embodiment of the battery cell assembly of FIG.

[0062] Since the battery cell 155 according to this embodiment is similar to the battery cell 150 according to the previous embodiment, a duplicated description of configurations that are substantially the same or similar to those of the previous embodiment will be omitted, and the following description will focus on the differences from the previous embodiment.

[0063] Referring to FIG. 4, the battery cell 155 may further include a metal washer 197 and an insulating washer 199 in addition to the components of the battery cell 150 described above.

[0064] The metal washer 197 is made of a conductive metal material and is a generally disk-shaped part with a hole formed in the center. The metal washer 197 is attached onto the crimping portion 172 of the battery can 170. The attachment of the metal washer 197 to the crimping portion 172 may be performed by, for example, laser welding.

[0065] 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 175, 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 the remaining portion of the top cap 175 excluding 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 the negative electrode of the battery cell 155.

[0066] The width (D2) of the metal washer 197 is formed to be greater 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 150. 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.

[0067] The insulating washer 199 is interposed between the top cap 175 and the metal washer 197. The insulating washer 199 is made of 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 insulating state. Therefore, it is advantageous to apply the insulating washer 199 in order to stably maintain such an insulating state.

[0068] 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) greater than the width (D1) of the upper surface of the crimping portion 172, and extends in a direction 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 a 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 and the protruding portion of the top cap 175 cannot contact each other.

[0069] When the insulating washer 199 is made of a resin material, the insulating washer 199 may be joined to the metal washer 197 and the top cap 175 by thermal fusion. In this case, the airtightness at the joining interface between the insulating washer 199 and the metal washer 197 and the joining interface between the insulating washer 199 and the top cap 175 is enhanced.

[0070] Hereinafter, the bus bar assembly 200 for electrically connecting to the plurality of battery cells 150 will be described in more detail.

[0071] 5 is a perspective view of a bus bar assembly of the battery pack of FIG. 2, FIG. 6 is a perspective view of a connecting bus bar of the bus bar assembly of FIG. 5, and FIG. 7 is an exploded perspective view of the connecting bus bar of FIG.

[0072] 5 to 7, the bus bar assembly 200 is provided on the upper side (+Z-axis direction) of the battery cell assembly 100 and is electrically connected to the plurality of battery cells 150. The electrical connection of the bus bar assembly 200 is parallel and / or series connection.

[0073] The bus bar assembly 200 is electrically connected to the positive electrode 175 (see FIG. 3) and the negative electrode 170 (see FIG. 3) of the plurality of battery cells 150 (see FIG. 2) and is electrically connected to external charge / discharge lines, etc. through connectors 260, 270, etc.

[0074] Hereinafter, the configuration of the bus bar assembly 200 will be described in more detail.

[0075] 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 .

[0076] The pair of main bus bars 210 and 220 may be electrically connected to the battery cell assembly 100 and may include connectors 260 and 270 that are connected to external charge / discharge lines.

[0077] The pair of main bus bars 210, 220 are electrically connected to the battery cells 150 arranged on both sides (Y-axis direction) of the outermost edge of the battery cells 150 of the battery cell assembly 100. Specifically, the pair of main bus bars 210, 220 are electrically connected to the battery cells 150 arranged on the outermost edge in the longitudinal direction (Y-axis direction) of the battery cell assembly 100.

[0078] The pair of main busbars 210 , 220 may include a main positive busbar 210 and a main negative busbar 220 .

[0079] The main positive bus bar 210 is disposed on one side (+Y-axis direction) of the bus bar assembly 200 at the upper side (+Z-axis direction) of the battery cell assembly 100. The main positive bus bar 210 is electrically connected to the positive electrode 175 of the battery cell 150 disposed on one side (+Y-axis direction) of the outermost edge of the battery cell assembly 100. The electrical connection is performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0080] A positive connector 260 (to be described later) for connection to the charge / discharge line may be provided on the main positive bus bar 210. The positive connector 260 protrudes from one side (+Y-axis direction) of the main positive bus bar 210.

[0081] An interconnection board connection part 215 for electrically connecting to an interconnection board 280 (described later) may be provided at one end (+X-axis direction) of the main positive bus bar 210. The interconnection board connection part 215 is connected to the interconnection board 280 via a screw connection, a rivet connection, or the like.

[0082] Meanwhile, the main positive electrode busbar 210 may be provided with a connection pipe through-hole 217 through which the connection pipe 390 passes to the upper side (+Z-axis direction) of the main positive electrode busbar 210 for connection to an external cooling line of the connection pipe 390 (see FIG. 2) described below.

[0083] The main negative bus bar 220 is disposed on the other side (-Y axis direction) of the bus bar assembly 200 from the upper side (+Z axis direction) of the battery cell assembly 100. The main negative bus bar 220 is electrically connected to the negative electrodes 170 of the battery cells 150 disposed on the other side (-Y axis direction) of the outermost edge of the battery cell assembly 100. The electrical connection is performed through a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0084] A negative connector 270 (to be described later) for connection to the charge / discharge line may be provided on the main negative bus bar 220. The negative connector 270 protrudes from the other side (−Y-axis direction) of the main negative bus bar 220.

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

[0086] The connecting bus bar 230 may be provided in a plurality to electrically connect the plurality of battery cells 150. The connecting bus bars 230 are 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 plurality of battery cells 150.

[0087] The plurality of connecting bus bars 230 are disposed at a predetermined distance from each other along the longitudinal direction (Y-axis direction) of the battery cell assembly 100. In addition, the plurality of connecting bus bars 230 are disposed between the main positive bus bar 210 and the main negative bus bar 220 in the longitudinal direction (Y-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 is formed to a predetermined length along the width direction (X-axis direction) of the battery cell assembly 100 and is electrically connected to the positive electrode 175 and the negative electrode 170 of the battery cell 150 .

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

[0091] The layer body 242 may be formed to a predetermined length along the width direction (X-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 (X-axis 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. It is understood that the layer body 242 may be made of other different materials for the electrical connection without being limited thereto.

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

[0094] The electrode connectors 246, 248 protrude from the layer body 242 and are 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 are provided in plurality, protrude to one side (-Y axis direction) of the layer body 242 by a predetermined size, and are disposed at a predetermined distance apart from each other along the longitudinal direction (X axis direction) of the layer body 242.

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

[0097] The negative electrode connectors 248 are provided in plurality, protrude to the other side (+Y-axis direction) of the layer body 242 by a predetermined size, and are disposed at a predetermined distance from each other along the longitudinal direction (X-axis direction) of the layer body 242. The plurality of negative electrode connectors 246 are disposed in a zigzag shape with the plurality of positive electrode connectors 242 in the longitudinal direction (Y-axis direction) of the layer body 242.

[0098] The negative electrode connectors 248 are electrically connected to the negative electrodes 170 of the battery cells 150 of the battery cell assembly 100 disposed under (in the -Z-axis direction) the bus bar assembly 200. The electrical connection is 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 be provided in a groove shape corresponding to the arc shape of an upper frame 173 of a battery can 170 (see FIG. 3) that forms the negative electrode of the battery cell 150.

[0100] The guide groove 249 is inserted into or tightly contacted with the upper frame 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 at the same time, further improving the accuracy of the welding process.

[0101] 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. The support layer 250 can have a shape corresponding to the layer body 250 and is contacted and fixed to the bottom (-Z axis direction) of the layer body 250.

[0102] The support layer 250 may be made of an insulating material to prevent electrical shorts between the battery cells 150 and the bus bar layer 240. As an example, the support layer 250 may be made of a polyimide film. However, the support layer 250 is not limited thereto, and it is understood that the support layer 250 may be made of other insulating members made of an insulating material.

[0103] An interconnection board connection part 255 may be provided at one end (+X-axis direction) of the support layer 250. The interconnection board connection part 255 is provided at a position corresponding to the interconnection board connection part 245 of the layer body 242, and is electrically connected to an interconnection board 280, which will be described later. The interconnection board connection part 255 is connected to the interconnection board 280 by screw connection, rivet connection, etc.

[0104] 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 protrudes from one side (+Y-axis direction) of the main positive busbar 210, and the negative connector 270 protrudes from the other side (-Y-axis direction) of the main negative busbar 220.

[0105] 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 a predetermined length in the longitudinal direction (Y-axis direction) of the bus bar assembly 280.

[0106] Specifically, the interconnection board 280 can measure the voltage of the battery cells 150 connected in parallel among the battery cells 150 of the battery cell assembly 100, and thereby can confirm the charging state of the battery cell assembly 100.

[0107] To this end, the interconnection board 280 is electrically connected to an external sensing line, and is electrically connected to the main positive bus bar 210 , the main negative bus bar 220 , and the plurality of connecting bus bars 230 .

[0108] The interconnection board 280 may include a sensing connector 285 and a bus bar connection 287 .

[0109] The sensing connector 285 may be connected to the external sensing line and may be provided at one end (+Y-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 parallel-connected battery cells based on the voltages of the parallel-connected battery cells.

[0110] The bus bar connectors 287 may be provided in plurality and may be arranged at a predetermined distance apart from each other along the longitudinal direction (Y-axis direction) of the interconnection board 280 .

[0111] The plurality of busbar connection portions 287 are connected to the interconnection board connection portion 215 of the main positive busbar 210, the interconnection board connection portion 225 of the main negative busbar 220, and the interconnection board connection portions 245, 255 of the plurality of connection busbars 230 by bolts, rivets, etc.

[0112] Referring again to FIG. 2, the cooling unit 300 is for cooling the battery cell assembly 100 and is disposed below the bus bar assembly 200 (-Z axis direction) and between the multiple battery cells 150 along the longitudinal direction (Y axis direction) of the battery cell assembly 100.

[0113] A plurality of cooling units 300 may be provided.

[0114] The plurality of cooling units 300 are disposed to face the plurality of battery cells 150 in a front-rear direction along a width direction (X-axis direction) of the plurality of battery cell assemblies 100. Here, the plurality of cooling units 300 are disposed to be in contact with the facing battery cells 150 to enhance cooling performance.

[0115] The cooling unit 300 will be described in more detail below.

[0116] FIG. 8 is an oblique view of the main parts of the cooling unit of the battery pack of FIG. 2, FIG. 9 is a cross-sectional view of the main parts of the cooling unit of FIG. 8, and FIG. 10 is a drawing explaining a cooling unit according to another embodiment of the present invention.

[0117] 8 to 10 and previous FIG. 2, the cooling unit 300 may include a cooling tube 310, a cooling passage 350, a cooling water inlet / outlet 370, and a connecting pipe 390.

[0118] The cooling tube 310 is formed to a predetermined length along the longitudinal direction (Y-axis direction) of the battery cell assembly 100, and is disposed between the plurality of battery cells 150, and may have a cooling flow path 350 therein for circulating coolant, which will be described later.

[0119] The cooling tubes 310 may be formed in a shape corresponding to the outer surfaces of the plurality of battery cells 150 facing each other in a width direction (X-axis direction) of the battery cell assembly 100 .

[0120] The cooling tube 310 may be formed such that a plurality of convex portions 312 and concave portions 316 formed in a convex or concave shape in the width direction (X-axis direction) of the battery cell assembly 100 are alternately arranged along the longitudinal direction (Y-axis direction) of the battery cell assembly.

[0121] The cooling tube 310 is disposed to contact outer surfaces of the battery cells 150 so as to further enhance the cooling performance of the battery cell assembly 100. The cooling tube 310 is adhered and fixed to the battery cells 150 through a thermally conductive member 400 (to be described later) or a separate adhesive member.

[0122] The cooling passage 350 circulates cooling water for cooling the battery cell assembly 100, is provided in the cooling tube 310, and is connected to communicate with a cooling water inlet / outlet 370, which will be described later.

[0123] The cooling passage 350 may include an upper passage 352 , a lower passage 354 , and a connecting passage 356 .

[0124] The upper flow passage 352 may be disposed above the cooling tube 310 so as to be provided near the bus bar assembly 200, and may be formed to a predetermined length along the longitudinal direction (Y-axis direction) of the cooling tube 310. The upper flow passage 352 is connected to communicate with the cooling water supply port 374 of the cooling water inlet / outlet part 370.

[0125] The upper passage 352 may be provided in a number of one or more. Hereinafter, in this embodiment, the upper passage 352 will be described as being provided in a number of multiple upper passages 352 in order to ensure cooling performance.

[0126] The lower passage 354 may be disposed below (in the -Z-axis direction) the cooling tube 310, spaced apart from the at least one upper passage 352, and formed to a predetermined length along the longitudinal direction (in the Y-axis direction) of the cooling tube 310. The lower passage 354 is connected to communicate with the cooling water discharge port 376 of the cooling water inlet / outlet part 370.

[0127] The number of the lower passages 354 may be at least one or more. Hereinafter, in this embodiment, the number of the lower passages 354 will be limited to a plurality of lower passages 354 in order to ensure cooling performance.

[0128] The connecting passage 356 may connect the at least one upper passage, in this embodiment, a plurality of upper passages 352, and the at least one lower passage, in this embodiment, a plurality of lower passages 354.

[0129] The connection passage 356 may be provided at the other end (-Y axis direction) of the cooling tube 310 opposite to the cooling water inlet / outlet 370 so as to maximize the cooling passage 350 .

[0130] In this embodiment, when the cooling water circulates in the cooling passage 350, the cooling water supplied from the cooling water supply port 374 is preferentially supplied to the upper passage 352 arranged near the bus bar assembly 200, and then can flow to the cooling water discharge port 376 side via the connecting passage 356 and the lower passage 354.

[0131] As a result, in this embodiment, cold cooling water is preferentially supplied to the area near the bus bar assembly 200, which has a relatively higher temperature distribution within the battery pack 10, thereby significantly improving the cooling performance of the battery cell assembly 100.

[0132] The cooling water inlet / outlet 370 is connected to the cooling tube 310 to communicate with the cooling passage 350 of the cooling tube 310. The cooling water inlet / outlet 370 is connected to communicate with a connection pipe 390 connected to an external cooling line, which will be described later.

[0133] The coolant inlet / outlet 370 may be provided on one side (+Y-axis direction) of the battery cell assembly 100 in the longitudinal direction (Y-axis direction) of the battery cell assembly 100. The cooling tube 310 connected to the coolant inlet / outlet 370 may be formed to a predetermined length from the coolant inlet / outlet 370 to the other side (-Y-axis direction) of the battery cell assembly 100 in the longitudinal direction (Y-axis direction) of the battery cell assembly 100.

[0134] Meanwhile, the coolant inlet / outlet 370 may be provided to be disposed between the plurality of battery cells 150 in the longitudinal direction (Y-axis direction) of the battery cell assembly 100 as shown in Fig. 8. Specifically, the cooling tube 330 of the cooling unit 305 may be formed to have a predetermined length from the coolant inlet / outlet 370 toward both sides (Y-axis direction) of the battery cell assembly 100 in the longitudinal direction (Y-axis direction) of the battery cell assembly 100. That is, the coolant inlet / outlet 370 of the cooling unit 305 may be provided in a bidirectional cooling structure in which the coolant inlet / outlet 370 of the cooling unit 305 is disposed in the center in the longitudinal direction of the battery cell assembly 100 and the cooling tube 330 is disposed on both sides of the coolant inlet / outlet 370.

[0135] The cooling water inlet / outlet 370 may include an inlet / outlet body 372 , a cooling water supply port 374 , and a cooling water exhaust port 376 .

[0136] The inlet / outlet body 372 is connected to one end (+Y-axis direction) of the cooling tube 310. A connecting pipe 390, which will be described later, may be provided on an upper side (+Z-axis direction) of the inlet / outlet body 372.

[0137] The coolant supply port 374 is provided in the inlet / outlet body 372 and connected to communicate with the upper passage 352. The coolant supply port 374 is connected to communicate with a connecting pipe 390, which will be described later.

[0138] The cooling water discharge port 376 is provided in the inlet / outlet body 372 and is connected to communicate with the lower passage 374. The cooling water discharge port 376 is spaced a predetermined distance from the cooling water supply port 374 and is connected to communicate with a connecting pipe 390, which will be described later.

[0139] The connecting pipe 390 may connect the cooling water supply ports 374 of the plurality of cooling units 300 to communicate with each other in an integrated manner, and may connect the cooling water discharge ports 376 of the plurality of cooling units 300 to communicate with each other in an integrated manner.

[0140] The connecting pipe 390 is connected to an external cooling line to supply the cooling water to the cooling water supply port 374 side of the plurality of cooling units 300, and can send the cooling water from the cooling water discharge port 376 side of the plurality of cooling units 300 to the external cooling line side.

[0141] The connecting pipe 390 may be exposed to the outside of the battery pack 10 by passing through a pipe hole 690 (see FIG. 12) of the top frame 600 and the connecting pipe through hole 217 (see FIG. 5) of the bus bar assembly 200, which will be described later, for connection to the external cooling line.

[0142] 2 again, the thermal conductive member 400 is filled in the space between the cooling unit 300 and the plurality of battery cells 100 in the height direction (Z-axis direction) of the battery pack 10. Meanwhile, in FIG. 2, the thermal conductive member 400 is shown by a hexahedron-shaped dotted line for ease of understanding, and the thermal conductive member 400 is filled in all the spaces between the cooling unit 300 and the plurality of battery cells 100.

[0143] The thermal 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.

[0144] The thermal conductive member 400 may be made of a potting resin. The potting resin may be formed by injecting a thin resin material into the battery cells 150 and hardening the resin material. Here, the resin material is injected at room temperature of about 15 to 25° C. to prevent thermal damage to the battery cells 150.

[0145] Specifically, the thermal conductive member 400 may be made of a silicone resin, but is not limited thereto, and the thermal conductive member 400 may be made of other resin materials capable of improving the fixing and heat dissipation efficiency of the battery cells 150, in addition to the silicone resin.

[0146] The thermal conductive member 400 is filled in the bus bar assembly 200 as well as the battery cells 150. Specifically, the battery cells 150 are filled in the bus bar assembly 200 so as to at least partially cover the bus bar assembly 200.

[0147] Here, the thermal conductive member 400 is continuously filled between the bus bar assembly 200 and the battery cell 100 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 100.

[0148] As described above, the thermal conduction member 400 according to the present embodiment is continuously filled between the battery cell 100 and the bus bar assembly 200 without any discontinuity, thereby realizing uniform heat dispersion without the occurrence of heat dispersion deviation in the region between the battery cell 100 and the bus bar assembly 200, thereby significantly improving the cooling performance of the battery pack 10.

[0149] Referring again to FIG. 2, the battery pack 10 may further include a bottom frame 500.

[0150] 11 is a perspective view of a bottom frame of the battery pack of FIG. 2. FIG.

[0151] 11 and the previous FIG. 2, the bottom frame 500 may support the battery cells 150 of the battery cell assembly 100.

[0152] The bottom frame 500 may include a bottom housing 510 , a cell guide rib 530 and a cooling tube support groove 550 .

[0153] The bottom housing 510 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.

[0154] The cell guide rib 530 is provided to more stably fix the battery cells 150, and is provided in plurality and protrudes from the bottom surface of the bottom housing 510 (-Z axis direction) at a predetermined height (+Z axis direction).

[0155] The cooling tube support groove 550, which is for stably fixing the cooling unit 300, is provided on the bottom surface (-Z axis direction) of the bottom housing 510, and the cooling tube 310 (see FIG. 8) is inserted into the cooling tube support groove 550. The cooling tube support groove 550 may be formed in a shape corresponding to the bottom of the cooling tube 310 for easier installation of the cooling tube 310.

[0156] Referring again to FIG. 2, the battery pack 10 may further include a top frame 600.

[0157] 12 is a perspective view of a top frame of the battery pack of FIG. 2, FIG. 13 is an enlarged view of a main portion of the top frame of FIG. 12, and FIG. 14 is a plan view of the top frame of FIG.

[0158] 12 to 14 and previous FIG. 2, the top frame 600 is provided on the upper side of the bottom frame 500 and can more stably fix and support the battery cell assemblies 100 and the bus bar assemblies 200.

[0159] The top frame 600 may include a top housing 610 , a cell support portion 630 , a connector hole 650 , an interconnection board mounting portion 670 , and a pipe hole 690 .

[0160] The top housing 610 may be provided on the upper side of the bottom housing 500 and may at least partially cover the battery cell assemblies 100 and the bus bar assemblies 200.

[0161] The top housing 610 may include a guide wall 615 .

[0162] The guide wall 615 is formed along an upper frame of the top housing 610 and protrudes from the upper frame at a predetermined height (+Z-axis direction). The guide wall 615 can prevent the thermal conductive member 400 from spilling out when the thermal conductive member 400 is injected, which will be described later, and can also guide the thermal conductive member 400 to be injected properly.

[0163] The cell support portion 630 is provided on the upper side of the top housing 610, supports the upper end (+Z-axis direction) of the battery cell 150 of the battery cell assembly 100, and is exposed at the upper portion (+Z-axis direction) to guide the electrical connection between the battery cell 150 and the bus bar assembly 200.

[0164] The cell support 630 may include a main opening 632 , an extension opening 634 , and a layer body seat 636 .

[0165] The main opening 632 is an opening of a predetermined size, and exposes the upper side of the battery cell 150 of the battery cell assembly 100, and can guide the electrical connection between the positive electrode 175 of the battery cell 150 of the battery cell assembly 100 and the positive electrode connection portion 246 of the bus bar assembly 200, while guiding easier injection of the thermal conductive member 400.

[0166] The extension opening 634 has an opening shape extending to a predetermined size on one side of the main opening 632 and can guide the electrical connection between the negative electrode 170 of the battery cell 150 of the battery cell assembly 100 and the negative electrode connection portion 248 of the bus bar assembly 200.

[0167] The extension opening 634 may have a shape corresponding to the shape of the negative electrode connecting part 248 of the busbar assembly 200. This may facilitate easier positioning of the negative electrode connecting part 248 when the busbar assembly 200 is disposed on the cell support part 630, and may maximize the welding space, thereby increasing the convenience of welding during the welding process and significantly improving the welding quality.

[0168] In this embodiment, through the main opening 632 and the extension opening 634 extending to one side from the main opening 632 to a predetermined size, a welding space for each welding can be secured to the maximum during a welding process for electrically connecting the positive electrode 175 and the negative electrode 170 of the battery cell 150 to the positive electrode connecting part 246 and the negative electrode connecting part 248 of the bus bar assembly 200. As a result, in this embodiment, the efficiency of the welding process can be further improved and the risk of an electrical short circuit between them can be minimized.

[0169] In addition, in this embodiment, the main opening 632 and the extended opening 634 can maximize the open area in the vertical direction (Z-axis direction) of the thermal conduction member 400 when injecting and applying the thermal conduction member 400 described below, so that the injection of the thermal conduction member 400 can be guided more smoothly and the thermal conduction member 400 can be injected more uniformly below the cell support portion 630.

[0170] The layer body placement part 636 is formed in a groove shape having a predetermined depth on the upper surface of the cell support part 630, and the layer body 242 and the support connector 250 can be placed thereon.

[0171] The layer body mounting portion 636 may be provided in the space between the main opening 632 and the extension opening 634, and may be formed to maximize the opening areas of the main opening 632 and the extension opening 634. In this embodiment, the layer body mounting portion 636 may be formed in a zigzag shape having a narrow width corresponding to the shape of the layer body 242.

[0172] As such, the cell support 630 according to this embodiment may support the battery cell 150 from above the battery cell assembly 100 and guide the electrical connection between the battery cell 150 and the bus bar assembly 200 .

[0173] In addition, the cell support portion 630 can maximize the open area in the vertical direction (Z-axis direction) of the battery pack 10 through the main opening 632, the extension opening 634, and the layer body mounting portion 636, thereby guiding smoother injection of the thermal conduction member 400 when injecting the thermal conduction member 400 described below, while simultaneously maximizing the amount of the thermal conduction member 400 injected.

[0174] Meanwhile, it is needless to say that the cell support 630 may further include an additional slit structure having an opening of a predetermined size in order to ensure the efficiency and amount of the thermal conductive member 400 injection process.

[0175] The connector holes 650 are provided on both sides (Y-axis direction) of the top housing 610, and the connectors 260 and 270 can pass through the connector holes 650 so as to be exposed to the outside of the top housing 610.

[0176] The interconnection board mounting part 670 is for mounting the interconnection board 280 (see FIG. 5 ) and may be provided on one side of the top housing 610. The interconnection board 280 is inserted into or adhesively fixed to the interconnection board mounting part 670. Here, the interconnection mounting part 670 may be provided with a sensing connector receiving structure that receives the sensing connector 285 so as to be exposed to the outside of the battery pack 10.

[0177] The pipe hole 690 may be provided at a position corresponding to the connection pipe through hole 217 (see FIG. 5) of the bus bar assembly 200, and may have an opening of a predetermined size so that the connection pipe 390 can pass through.

[0178] Hereinafter, a manufacturing process of the battery pack 10 according to the present embodiment will be described in more detail, focusing on a process of electrically connecting the battery cell assembly 100 and the bus bar assembly 200 and forming a pack case through the thermal conductive member 400.

[0179] 15 and 16 are views illustrating an electrical connection between the battery cell assembly and the bus bar assembly of the battery pack of FIG.

[0180] 15 and 16, when manufacturing the battery pack 10, a manufacturer may mount the battery cell assembly 100 and the cooling unit 300 (see FIG. 2) therein by combining the bottom frame 500 and the top frame 600. Here, the connecting pipe 390 of the cooling unit 300 protrudes above the top housing 610 of the top frame 600.

[0181] The manufacturer may assemble the bus bar assembly 200 to the top frame 600 for electrical connection of the battery cell assembly 100. Specifically, the layer body 242 of the connection bus bar 230 of the bus bar assembly 200 is placed on the layer body placement portion 636, the positive electrode connecting portion 246 is disposed on the main opening 632, and the negative electrode connecting portion 248 is disposed on the extension opening 634. Here, the guide groove 249 of the negative electrode connecting portion 248 is inserted into or closely contacted with the upper frame 173 of the negative electrode 170 of the battery cell 150.

[0182] The layer body mounting portion 636, the main opening 632, and the extension opening 634 may guide the positioning of each component of the busbar assembly 200 prior to the welding process between the busbar assembly 200 and the battery cell assembly 100, and may also more stably support each component of the busbar assembly 200.

[0183] Thereafter, the manufacturer may electrically connect the battery cell assembly 100 and the bus bar assembly 200 to each other through a welding process such as laser welding.

[0184] Specifically, the positive electrode 175 of the battery cell 150 is connected to the positive electrode connecting portion 246 of the bus bar assembly 200 on the main opening 632 through laser welding, etc., and the negative electrode 170 of the battery cell 150 is connected to the negative electrode connecting portion 248 of the bus bar assembly 200 on the extension opening 634 through laser welding, etc.

[0185] In this embodiment, the welding process for electrically connecting the positive electrode 175 and the negative electrode 170 of the battery cell assembly 100 to the bus bar assembly 200 is performed through the main opening 632 and the extension opening 634 while maintaining a predetermined separation distance and a predetermined open area from each other, making the welding process easier and significantly improving the welding quality.

[0186] In addition, in this embodiment, the welding process is performed after the connecting bus bar 230 is placed on the layer body mounting portion 636 and the upper frame 173 of the negative electrode 170 of the battery cell 150 is inserted into or contacted closely to the guide groove 249 of the negative electrode connecting portion 248. Therefore, during the welding, a more stable fixation between the battery cell 150 and the bus bar assembly 200 can be achieved, and the welding accuracy can be further ensured.

[0187] 17 and 18 are diagrams illustrating the formation of a pack case structure through the thermal conductive member of the battery pack of FIG.

[0188] 17 and 18, the manufacturer may then inject and apply the thermal conductive member 400 using a resin injection device (I) to form a pack case of the battery pack 10 through the thermal conductive member 400 made of the resin material.

[0189] In this embodiment, the bottom frame 500 and the top frame 600 may function as a mold when injecting the thermal conductive member 400. As a result, in this embodiment, a structure such as a mold that is temporarily attached when injecting the thermal conductive member 400 and is subsequently detached may be omitted, thereby improving the efficiency of the manufacturing process of the battery pack 10 and significantly reducing manufacturing costs.

[0190] When injecting the thermal conductive member 400, the guide wall 615 of the top frame 600 can prevent the thermal conductive member 400 from overflowing and can adjust the injection amount of the thermal conductive member 400. The manufacturer can complete the injection of the thermal conductive member 400 after injecting the thermal conductive member 400 up to the tip of the guide wall 615 in the vertical direction (+Z-axis direction).

[0191] In addition, in the case of this embodiment, the maximum open area can be secured on the upper side (+Z axis direction) of the battery pack 10 through the main opening 632, the extended opening 634, and the layer body mounting portion 636, so that the injection efficiency of the thermal conduction member 400 can be significantly improved when the thermal conduction member 400 is injected.

[0192] Here, in order to connect an external charge / discharge line, an external sensing line, an external cooling line, etc., the thermal conductive member 400 is not injected or applied to the upper end (+Z-axis direction) of the positive connector 260, the negative connector 270, the sensing connector 285, and the connecting pipe 390.

[0193] Meanwhile, the thermal conductive member 400 may be applied to cover at least a portion of the side surfaces of the bottom frame 500 and the top frame 600 .

[0194] When the thermal conductive member 400 is hardened, the thermal conductive member 400 may form a pack case of the battery pack 10. Accordingly, in this embodiment, since the pack case is formed through the thermal conductive member 400 provided with 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 a plurality of plates, and the manufacturing cost can be significantly reduced, thereby ensuring cost competitiveness.

[0195] In addition, in this embodiment, the pack case structure including the thermal conductive member 400 can reduce the overall size of the battery pack 10 and significantly increase the energy density, compared to a conventional cell frame structure including an assembly of multiple plates.

[0196] FIG. 19 is a diagram illustrating a vehicle according to an embodiment of the present invention.

[0197] Referring to FIG. 19, the automobile 1 may be an electric or hybrid automobile, and may include, as an energy source, at least one battery pack 10 of the above-described embodiments.

[0198] In this embodiment, since the battery pack 10 described above is provided with a compact structure having high energy density, it is easy to realize a modular structure of multiple battery packs 10 when installed in the automobile 1, and a relatively high degree of installation freedom can be ensured even in various shapes of the interior space of the automobile 1.

[0199] According to the various embodiments described above, it is possible to provide a battery pack 10 capable of increasing energy density while ensuring rigidity, and an automobile 1 including the battery pack 10.

[0200] In addition, through the various embodiments described above, it is possible to provide a battery pack 10 and an automobile 1 including the battery pack 10, which can improve cost competitiveness and manufacturing efficiency.

[0201] In addition, through the various embodiments described above, it is possible to provide a battery pack 10 and an automobile 1 including the battery pack 10 that can improve cooling performance.

[0202] Although the preferred embodiments of the present invention have been illustrated and described above, it goes without saying that the present invention is not limited to the specific embodiments described above, and that various modifications may be made by those skilled in the art without departing from the spirit of the present invention as claimed in the claims. Such modifications should not be understood individually from the technical ideas and perspectives of the present invention. [Explanation of symbols]

[0203] 10 Battery pack 100 Battery Cell Assembly 150 Battery Cells 200 Busbar Assembly 300 Cooling Unit 400 Thermal Conductive Materials

Claims

1. In the battery pack, 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 cooling unit disposed below the bus bar assembly and between the battery cells along a longitudinal direction of the battery cell assembly; a heat conductive member filling a space between the cooling unit and the plurality of battery cells; Including, the thermal conductive member is continuously filled between the bus bar assembly and the cooling unit in a vertical direction of the battery cell assembly.

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 made of a potting resin.

4. The cooling unit includes: a cooling tube formed to a predetermined length along a longitudinal direction of the battery cell assembly, the cooling tube being disposed between the plurality of battery cells, the cooling tube having a cooling flow path for circulating coolant therein; a cooling water inlet / outlet port connected to the cooling tube so as to communicate with a cooling flow path of the cooling tube; The battery pack according to claim 1 , comprising:

5. The battery pack according to claim 4 , wherein the cooling tube is formed in a shape corresponding to the outer surfaces of the plurality of battery cells facing each other.

6. The battery pack according to claim 4 , wherein the cooling tube is formed such that protrusions and recesses are alternately arranged along a longitudinal direction of the battery cell assembly.

7. The coolant inlet / outlet port is provided on one side of the battery cell assembly along a longitudinal direction thereof, The battery pack according to claim 4 , wherein the cooling tube is formed to a predetermined length from the cooling water inlet / outlet port toward another side of the battery cell assembly in a longitudinal direction of the battery cell assembly.

8. the cooling water inlet / outlet port is disposed between the plurality of battery cells in a longitudinal direction of the battery cell assembly, The battery pack according to claim 4 , wherein the cooling tube is formed to a predetermined length from the cooling water inlet / outlet port toward both sides of the battery cell assembly in a longitudinal direction of the battery cell assembly.

9. The cooling flow path includes: At least one upper flow passage is disposed above the cooling tube and is formed to a predetermined length along a longitudinal direction of the cooling tube; At least one lower flow passage is disposed below the cooling tube and spaced apart from the at least one upper flow passage, and is formed to a predetermined length along a longitudinal direction of the cooling tube; a connecting passage connecting the at least one upper passage and the at least one lower passage; The battery pack of claim 4 , comprising:

10. The cooling water inlet / outlet portion is an inlet / outlet body connected to one end of the cooling tube; a cooling water supply port provided in the inlet / outlet body and connected to communicate with the upper flow passage; a cooling water discharge port provided in the inlet / outlet body and connected to communicate with the lower flow passage; 10. The battery pack of claim 9, comprising:

11. The battery pack according to claim 9 , wherein the connecting passage is provided at the other end of the cooling tube.

12. The battery pack according to claim 4 , wherein an outer surface of the cooling tube is arranged to be in contact with outer surfaces of the plurality of battery cells.

13. The bus bar assembly includes: A pair of main bus bars electrically connected to the battery cell assembly and having connectors connected to 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; 13. The battery pack of claim 1, comprising:

14. A motor vehicle comprising at least one battery pack according to any one of claims 1 to 13.

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