Busbar assembly, battery pack including same, and automobile

Abstract

A battery pack according to an embodiment of the present invention includes a plurality of battery cells; and a busbar assembly disposed on one side of the battery cells and electrically connecting the battery cells, the busbar assembly including a sub-busbar for electrically connecting to a positive electrode and a negative electrode of the battery cells, and a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cells.

Description

[Technical Field]

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

[0002] This application claims priority based on Korean Patent Application No. 10-2021-0058819, filed on May 6, 2021, and the entire contents disclosed in the specification and drawings of that application are incorporated herein by reference. [Background technology]

[0003] Secondary batteries, which have high applicability across a range of 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 powered by electrical sources. These secondary batteries not only have the temporary advantage of dramatically reducing the use of fossil fuels, but also have the advantage of producing no by-products associated with energy use, and are therefore attracting attention as a new energy source that is environmentally friendly and improves energy efficiency.

[0004] Currently widely used types of secondary batteries 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 approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting multiple battery cells in series. Alternatively, a battery pack may be configured by connecting multiple battery cells in parallel depending on the required charge / discharge capacity of the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set depending on the required output voltage and / or charge / discharge capacity.

[0005] Meanwhile, when a battery pack is constructed by connecting a plurality of battery cells in series and / or in 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 such as a bus bar assembly to construct a battery pack or a battery rack.

[0006] A conventional battery pack generally includes a plurality of battery cells, a bus bar assembly for electrically connecting the battery cells, and a cell frame that houses the plurality of battery cells and the bus bar assembly. 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 multiple plates increases manufacturing costs and complicates the assembly process, 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] Therefore, an object of the present invention is to provide a busbar assembly that can increase energy density while ensuring rigidity, and a battery pack and a vehicle including the same.

[0010] Another object of the present invention is to provide a busbar assembly that can improve cost competitiveness and manufacturing efficiency, and a battery pack and a vehicle including the same.

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

[0012] To achieve the above object, the present invention provides a battery pack including: a plurality of battery cells; and a busbar assembly disposed on one side of the battery cells and electrically connecting the battery cells, wherein the busbar assembly includes sub-busbars for electrically connecting to positive and negative electrodes of the battery cells; and a busbar cover covering the sub-busbars and having busbar holes for guiding electrical connection between the sub-busbars and the battery cells.

[0013] Preferably, the battery pack may include a filler member that fills spaces between the plurality of battery cells and at least partially covers the bus bar assembly.

[0014] Preferably, the filler member may be filled into spaces between the plurality of battery cells through the busbar holes on one side of the busbar assembly.

[0015] Preferably, the connection between the sub-bus bar and the positive electrode of the battery cell and the connection between the sub-bus bar and the negative electrode of the battery cell may be performed in an open space of the bus bar hole.

[0016] Preferably, the sub-busbar may include a strip-shaped busbar bridge having a predetermined length and width, a positive electrode connection portion extending integrally and protruding from the busbar bridge and connecting with the positive electrode of the battery cell, and a negative electrode connection portion extending integrally and protruding from the busbar bridge and connecting with the negative electrode of the battery cell.

[0017] Preferably, the negative electrode connection portion may protrude in a direction opposite to that of the positive electrode connection portion.

[0018] Preferably, the busbar hole may include a main hole formed in the busbar cover to have an opening space of a predetermined size within the busbar cover, and an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size.

[0019] Preferably, the positive electrode connection part may be disposed in the main hole, and the negative electrode connection part may be disposed in the auxiliary hole.

[0020] Preferably, an inner portion of an upper edge of the battery cell, on which the positive electrode is formed, may be disposed in the main hole.

[0021] Preferably, the opening space of the main hole may be larger than the size of the positive electrode connecting portion.

[0022] Preferably, the opening space of the auxiliary hole may be at least as large as or larger than the size of the negative electrode connecting portion.

[0023] Preferably, the bus bar covers are provided in pairs, and the sub-bus bar can be inserted between the pair of bus bar covers.

[0024] Preferably, the sub-busbars are provided as a single layer in the form of strips having a predetermined length and width.

[0025] The present invention also provides a busbar assembly for electrically connecting battery cells of a battery pack, comprising: a sub-busbar for electrically connecting to a positive electrode and a negative electrode of the battery cell; and a busbar cover covering the sub-busbar and having a busbar hole for guiding the electrical connection between the sub-busbar and the battery cell.

[0026] The present invention also provides a vehicle including at least one battery pack according to the above-described embodiment. [Effects of the Invention]

[0027] According to the various embodiments described above, it is possible to provide a busbar assembly that can increase energy density while ensuring rigidity, and a battery pack and a vehicle including the busbar assembly.

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

[0029] Furthermore, according to the various embodiments described above, it is possible to provide a busbar assembly capable of improving cooling performance, a battery pack including the same, and a vehicle.

[0030] The drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further understand the technical concepts of the present invention as well as the content of the invention, and therefore the present invention should not be interpreted as being limited to only the matters depicted in the drawings. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a diagram illustrating a battery pack according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the battery pack of FIG. 1. [Figure 3] 3 is a diagram illustrating a battery cell of a battery cell assembly of the battery pack of FIG. 2. FIG. [Figure 4] 4A and 4B are diagrams illustrating a battery cell according to another embodiment of the battery cell assembly of FIG. 3. [Figure 5] FIG. 3 is a perspective view of a busbar 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. 3 is a perspective view of a cooling unit of the battery pack of FIG. 2. [Figure 8] FIG. 8 is a cross-sectional view of the cooling unit of FIG. 7. [Figure 9] FIG. 3 is a perspective view of an S structure unit of the battery pack of FIG. 2. [Figure 10] FIG. 3 is a perspective view of the bottom plate of the battery pack of FIG. 2. [Figure 11] 11A and 11B are diagrams illustrating an Esstructure support rib according to another embodiment of the bottom plate of FIG. 10. [Figure 12] 2 is a diagram for explaining the structural formation of the pack case by the filling member of the battery pack of FIG. 1. FIG. [Figure 13] 10A and 10B are diagrams illustrating a battery pack according to another embodiment of the present invention. [Figure 14] FIG. 14 is an exploded perspective view of the battery pack of FIG. 13. [Figure 15] 15 is a diagram for explaining a battery cell of the battery pack of FIG. 14. FIG. [Figure 16] FIG. 16 is a partial cross-sectional view showing the internal structure of the battery cell of FIG. [Figure 17] FIG. 16 is a partial cross-sectional view showing the upper structure of the battery cell of FIG. 15. [Figure 18] FIG. 16 is a partial cross-sectional view showing the lower structure of the battery cell of FIG. 15. [Figure 19] FIG. 16 is a bottom view of the battery cell of FIG. 15. [Figure 20] FIG. 14 is an exploded perspective view of a connecting bus bar of the bus bar assembly of the battery pack of FIG. 13. [Figure 21] 21 is an enlarged view of a main part of the bus bar cover of the connection bus bar of FIG. 20. [Figure 22] 21 is a diagram for explaining a sub-bus bar of the connection bus bar of FIG. 20. FIG. [Figure 23]21 is a diagram for explaining injection of a filler material through a busbar hole in a busbar cover of the connection busbar of FIG. 20. FIG. [Figure 24] 21 is a diagram for explaining injection of a filler material through a busbar hole in a busbar cover of the connection busbar of FIG. 20. FIG. [Figure 25] 1 is a diagram illustrating a vehicle according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will become more apparent from the detailed description of preferred embodiments of the present invention with reference to the accompanying drawings. The embodiments described herein are shown as examples to aid in understanding 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, to aid in understanding the invention, the accompanying drawings are not drawn to scale, and the dimensions of some components may be exaggerated.

[0033] 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.

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

[0035] The battery pack 1 may include a battery cell assembly 100, a bus bar assembly 200, a cooling unit 300, and an e-structure unit 400.

[0036] The plurality of battery cells 150 are secondary batteries and may be provided as cylindrical secondary batteries, pouch secondary batteries, or prismatic secondary batteries. Hereinafter, in this embodiment, the description will be limited to the case where the plurality of battery cells 150 are cylindrical secondary batteries.

[0037] FIG. 3 is a diagram for explaining a battery cell of a battery cell assembly of the battery pack of FIG.

[0038] 3 and the previous FIG. 2, 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 have a positive electrode 175 and a negative electrode 170 together 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 at the upper edge 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 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, which may facilitate electrical connection with the busbar assembly 200 described later.

[0040] Therefore, 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), which makes it possible to further simplify the connection structure with the busbar assembly 200 described later compared to a structure in which they are arranged in two mutually opposing directions, and also makes it possible to reduce the volume occupied by such electrical connection structure.

[0041] In this manner, in this embodiment, the electrical connection structure between the battery cells 150 and the bus bar assembly 200 described later is simplified, thereby making it possible to make the battery pack structure more compact and improve the energy density.

[0042] The battery cell 150 will be described in more detail below.

[0043] The battery cell 150 may include an electrode assembly 160, a battery can 170, and a top cap 175. In addition to the above-mentioned components, 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.

[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 stack around a winding center C. In this case, a separator may be provided on the outer periphery of the electrode assembly 160 to insulate it from the battery can 170. The first electrode plate may be a positive or negative electrode plate, and the second electrode plate may be an electrode plate having the opposite polarity to 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 the upper portion in the height direction (direction parallel to the Z axis) of the electrode assembly 160 housed in the battery can 170.

[0046] The second electrode plate includes a second electrode current collector and a second electrode active material applied to one or both sides of the second electrode current collector. An uncoated portion where the second electrode active material is not applied exists at the other end of the second electrode current 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 housed in the battery can 170.

[0047] The battery can 170 is a cylindrical container having an opening at the top and 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 its upper end. The beading portion 171 is formed on the upper portion of the electrode assembly 160. The beading portion 171 is formed by pressing the 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 coming out of the opening at the upper end of the battery can 170 and may function as a support portion on which a top cap 175 is placed.

[0050] An upper edge 173 of the beading portion 171 of the battery can 170 may be fitted 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 bus bar assembly 200, which will be described later, and the battery can 170, which functions as the negative electrode 170.

[0051] The crimping portion 172 is formed on the upper portion of the beading portion 171. The crimping portion 172 extends and has a bent shape so as to surround the outer circumferential surface of the 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 component made of a conductive metal material and covers the opening at the top end of the battery can 170. The top cap 175 is electrically connected to the 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 the 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 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.

[0054] The top cap 175 may include a protrusion formed to protrude upward from the center thereof, which 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 the upper part 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 may be connected to the current collecting plate 185, and the lead 187 may extend above the electrode assembly 160 and 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 together by, for example, laser welding. The laser welding may be performed by partially melting the base material of the current collecting plate 185, or may be performed with solder 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.

[0057] The current collecting plate 185 may also be attached to the bottom surface of the electrode assembly 160. In this case, one surface of the current collecting plate 185 may be attached to the second electrode tab 164 of the electrode assembly 160 by welding, and the other surface may be attached to the inner bottom surface of the battery can 170 by welding. The attachment structure between the current collecting plate 185 attached to the bottom surface of the electrode assembly 160 and the second electrode tab 164 is substantially the same as the attachment structure of the current collecting plate 185 attached to the top 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 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.

[0059] The insulating plate 190 has lead holes 193 through which leads 187 extending upward from the current collecting plate 185 or the first electrode tab 162 can be drawn out. The leads 187 are drawn upward through the lead holes 193 and coupled to the lower surface of the connection plate 195 or the lower surface of the 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 upper edge 173 of the top cap 175 provided on the upper side and the upper 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 (the direction parallel to the Z axis in FIG. 2 ). Therefore, when electrically connecting multiple battery cells 150, the battery cell 150 according to an embodiment of the present invention allows electrical connection components such as the bus bar assembly 200 to be disposed on only one side of the battery cells 150, thereby simplifying the structure and improving energy density.

[0061] FIG. 4 is a view for explaining 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 above-described embodiment, redundant descriptions of configurations that are substantially identical or similar to those of the above-described embodiment will be omitted, and the following description will focus on the differences from the above-described 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 configuration 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 to 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 197, and the metal washer 197 and a protrusion formed in the center of the top cap 175 are spaced apart from each other. The metal washer 197 is also spaced apart from other parts of the top cap 175, excluding the protrusion, in the vertical direction. 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 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 component, such as the bus bar assembly 200, and the metal washer 197 when the electrical connection component is coupled to the metal washer 197 to connect a plurality of battery cells 150. By increasing the bonding area between the electrical connection component and the metal washer 197 in this manner, the welding process can be performed smoothly, the fastening force between the two components 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 the top cap 175 and the metal washer 197 must remain electrically insulated from each other. Therefore, it may be advantageous to use the insulating washer 199 to stably maintain this 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 that is greater than the width D1 of the upper surface of the crimping portion 172, and extends from the crimping portion 172 toward the protruding portion at the center of the top cap 175. In this manner, the insulating washer 199 may have a shape that extends to cover the inner circumferential surface of the hole formed at the center of the metal washer 197 so that the inner circumferential surface of the hole formed at the center of the metal washer 197 and the protruding portion of the top cap 175 cannot come into contact with each other.

[0069] If the insulating washer 199 is made of a resin material, the insulating washer 199 can 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 can be improved.

[0070] Hereinafter, the bus bar assembly 200 for electrically connecting with 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, and FIG. 6 is a perspective view of a connecting bus bar of the bus bar assembly of FIG.

[0072] 5 and 6, the bus bar assembly 200 may be provided on the 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 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 may be electrically connected to external charge / discharge lines, etc., via connectors 260, 270, etc.

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

[0075] The bus bar assembly 200 may include a pair of main bus bars 210, 220, a connecting bus bar 230, a cooling unit insertion slit 250, and a pair of connectors 260, 270.

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

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

[0078] The pair of main bus bars 210 and 220 may include a main positive bus bar 210 and a main negative bus bar 220 .

[0079] The main positive electrode bus bar 210 may be disposed on one side (-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 electrodes 175 of the battery cells 150 disposed on one outermost side (-X axis direction) of the battery cell assembly 100. The electrical connection may be performed by a welding process for electrical connection, such as laser welding or ultrasonic welding.

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

[0081] The main negative electrode bus bar 220 may be disposed on the other side (+X-axis direction) of the bus bar assembly 200 at 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 electrodes 170 of the battery cells 150 disposed on the other outermost side (+X-axis direction) of the battery cell assembly 100. The electrical connection may be performed by a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0082] A negative electrode connector 270 (to be described later) for connection to the charge / discharge line may be provided on the main negative electrode bus bar 220. The negative electrode connector 270 may be provided to protrude from the other side (+X-axis direction) of the main negative electrode bus bar 220.

[0083] The connection bus bar 230 is for electrically connecting the plurality of battery cells 150, and a plurality of connection bus bars 230 may be provided. The plurality of connection bus bars 230 may be electrically connected to the pair of main bus bars 210, 220 and connected to the positive electrodes 175 and the negative electrodes 170 of the plurality of battery cells 150.

[0084] The plurality of connection bus bars 230 may be arranged at predetermined distances from each other along the longitudinal direction (X-axis direction) of the battery cell assembly 100. Furthermore, the plurality of connection bus bars 230 may be arranged between the main positive electrode bus bar 210 and the main negative electrode bus bar 220 in the longitudinal direction (X-axis direction) of the bus bar assembly 200.

[0085] Each of the plurality of connection bus bars 230 may include a layer body 242 and electrode connection portions 246, 248.

[0086] The layer body 242 may be formed to 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 (Y-axis direction) of the battery cell assembly 100 for electrical connection with the battery cells 150.

[0087] 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 is not limited thereto, and may be made of other materials for electrical connection.

[0088] A support layer may be provided on the bottom of the layer body 242. The support layer may be provided on the bottom (-Z axis direction) of the layer body 242 and may support the layer body 242. The support layer may have a shape corresponding to the layer body 242 and may be fixed in contact with the bottom (-Z axis direction) of the layer body 242.

[0089] The support layer may be made of an insulating material to prevent electrical shorts between the battery cells 150 and the layer body 242. For example, the support layer may be made of a polyimide film. However, the support layer is not limited thereto, and may be made of other insulating materials.

[0090] 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.

[0091] The positive electrode connection portion 246 may be provided in multiple numbers, protruding to one side (+X-axis direction) of the layer body 242 by a predetermined size, and arranged at a predetermined distance from each other along the longitudinal direction (Y-axis direction) of the layer body 242.

[0092] The plurality of positive electrode connection parts 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 by a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0093] The negative electrode connection portion 248 may be provided in plurality, protruding to a predetermined size on the other side (-X axis direction) of the layer body 242, and spaced apart from each other by a predetermined distance along the longitudinal direction (Y axis direction) of the layer body 242.

[0094] The plurality of negative electrode connection parts 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 by a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0095] The cooling unit insertion slit 250 is provided in the main bus bar 220 and allows one end 370 of the cooling unit 300, which will be described later, to pass through. Specifically, a plurality of cooling unit insertion slits 250 are provided in the main negative electrode bus bar 220 and allows a coolant inlet / outlet port 370 of the cooling unit 300, which will be described later, to pass through. The coolant inlet / outlet port 370, which will be described later, may be disposed to pass through the cooling unit insertion slit 250 and be exposed to the front (+X-axis direction) of the main bus bar 220, like a connector 270, which will be described later.

[0096] The pair of connectors 260, 270 are for connection to an external charge / discharge line and may be composed of a positive connector 260 and a negative connector 270. The positive connector 260 may be provided to protrude from one side (-X-axis direction) of the main positive bus bar 210, and the negative connector 270 may be provided to protrude from the other side (+X-axis direction) of the main negative bus bar 220.

[0097] Referring again to FIG. 2, the cooling unit 300 is for cooling the battery cell assembly 100 and may be disposed below the bus bar assembly 200 (-Z axis direction) and between the plurality of battery cells 150 along the longitudinal direction (X axis direction) of the battery cell assembly 100.

[0098] A plurality of cooling units 300 may be provided.

[0099] The plurality of cooling units 300 may be disposed to face the plurality of battery cells 150 in the width direction (Y-axis direction) of the plurality of battery cell assemblies 100. Here, the plurality of cooling units 300 may be disposed to contact the facing battery cells 150 to enhance cooling performance.

[0100] The cooling unit 300 will be described in more detail below.

[0101] 7 is a perspective view of the cooling unit of the battery pack of FIG. 2, and FIG. 8 is a cross-sectional view of the cooling unit of FIG.

[0102] 7, 8 and previous FIG. 2, the cooling unit 300 may include a cooling tube 310, a cooling passage 350, and a cooling water inlet / outlet 370.

[0103] The cooling tube 310 is formed to a predetermined length along the longitudinal direction (X-axis direction) of the battery cell assembly 100, is disposed between the plurality of battery cells 150, and may have a cooling flow path 350 for circulating coolant, which will be described later, provided therein.

[0104] The cooling tube 310 may be formed in a shape corresponding to the outer surfaces of the plurality of battery cells 150 facing each other in the width direction (Y-axis direction) of the battery cell assembly 100.

[0105] The cooling tube 310 may have a plurality of convex protrusions 312 formed in a convex shape and a plurality of concave recesses 316 formed in a concave shape in the width direction (Y-axis direction) of the battery cell assembly 100, and the convex protrusions 312 and the concave recesses 316 may be formed so as to be alternately arranged along the longitudinal direction (X-axis direction) of the battery cell assembly.

[0106] The cooling tube 310 may be disposed in contact with outer surfaces of the plurality of battery cells 150 to further improve the cooling performance of the battery cell assembly 100. The cooling tube 310 may be adhesively fixed to the plurality of battery cells 150 by a filler member 500 described below or a separate adhesive member, etc.

[0107] The cooling flow path 350 circulates coolant for cooling the battery cell assembly 100, and may be provided in the cooling tube 310 and connected to communicate with the coolant inlet / outlet portion 370 described later.

[0108] The cooling passage 350 may include an upper passage 352 , a lower passage 354 and a connecting passage 356 .

[0109] The upper flow passage 352 may be disposed above the cooling tube 310 so as to be adjacent to the bus bar assembly 200, and may be formed to a predetermined length along the longitudinal direction (X-axis direction) of the cooling tube 310. The upper flow passage 352 may be connected to communicate with the cooling water supply port 374 of the cooling water inlet / outlet part 370.

[0110] The upper flow passage 352 may be provided in one or more numbers. In the following, this embodiment will be described only in the case where the upper flow passage 352 is provided in multiple numbers in order to ensure cooling performance.

[0111] The lower flow passage 354 may be disposed below the cooling tube 310 (in the -Z-axis direction) at a distance from the at least one upper flow passage 352, and may be formed to a predetermined length along the longitudinal direction (X-axis direction) of the cooling tube 310. The lower flow passage 354 may be connected to communicate with the coolant discharge port 376 of the coolant inlet / outlet part 370.

[0112] The lower flow passage 354 may be provided in at least one or more than one number. In the following, this embodiment will be described only in the case where the lower flow passage 354 is provided in multiple numbers in order to ensure cooling performance.

[0113] The connecting passage 356 can connect at least one upper passage, in this embodiment, a plurality of upper passages 352, to the at least one lower passage, in this embodiment, a plurality of lower passages 354.

[0114] The connecting flow path 356 may be provided at the other end (+X-axis direction) of the cooling tube 310 opposite to the cooling water inlet / outlet port 370 in order to maximize the cooling flow path 350 .

[0115] In this embodiment, in the circulation of the cooling water within the cooling flow passage 350, the cooling water supplied from the cooling water supply port 374 flows preferentially to the upper flow passage 352 arranged adjacent to the bus bar assembly 200, and can then flow toward the cooling water discharge port 376 via the connecting flow passage 356 and the lower flow passage 354.

[0116] Therefore, in this embodiment, cold cooling water is preferentially supplied to the area adjacent to the bus bar assembly 200, which has a relatively high temperature distribution within the battery pack 1, thereby significantly improving the cooling performance of the battery cell assembly 100.

[0117] The cooling water inlet / outlet port 370 may be connected to the cooling tube 310 so as to communicate with the cooling flow path 350 of the cooling tube 310. The cooling water inlet / outlet port 370 may be connected to communicate with an external cooling line through the cooling unit insertion slit 250.

[0118] The coolant inlet / outlet port 370 may be provided on one side (+X-axis direction) of a side of the battery cell assembly 100 along the longitudinal direction (X-axis direction) of the battery cell assembly 100. The cooling tube 310 connected to the coolant inlet / outlet port 370 may be formed to a predetermined length from the coolant inlet / outlet port 370 toward the other side (-X-axis direction) of the side of the battery cell assembly 100 along the longitudinal direction (X-axis direction) of the battery cell assembly 100.

[0119] 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 .

[0120] The inlet / outlet body 372 may be connected to one end (positive X-axis direction) of the cooling tube 310. A connection pipe 390 (described later) may be provided on the upper side (positive Z-axis direction) of the inlet / outlet body 372.

[0121] The cooling water supply port 374 may be provided in the inlet / outlet body 372 and connected to communicate with the upper flow passage 352. The cooling water supply port 374 may be connected to communicate with the external cooling line.

[0122] The cooling water discharge port 376 may be provided in the inlet / outlet body 372 and connected to communicate with the lower flow passage 354. The cooling water discharge port 376 may be disposed at a predetermined distance from the cooling water supply port 374 and connected to communicate with the external cooling line.

[0123] Referring again to FIG. 2, the structural unit 400 is intended to ensure the rigidity of the battery cell assembly 100 and may be disposed to at least partially surround the cooling unit 300 and the battery cell assembly 100.

[0124] 9 is a perspective view of the construction unit of the battery pack of FIG. 2. FIG.

[0125] 9 and 2, the S structure unit 400 may include at least one S structure bar 450 formed to a predetermined length along the longitudinal direction (X-axis direction) of the battery cell assembly 100 and covering at least one side surface of the battery cell 150. The at least one S structure bar 450 may have a shape corresponding to the outer surfaces of the opposing battery cells 150.

[0126] The S structure bar 450 may be provided in plurality, and the S structure bars 450 may be arranged at predetermined distances from each other along the width direction (Y-axis direction) of the battery cell assembly 100.

[0127] The cooling unit 300 may be disposed between the plurality of S-structure bars 450. Specifically, the cooling unit 300 may be disposed between the plurality of S-structure bars 450 in the width direction (Y-axis direction) of the battery cell assembly 100. More specifically, the plurality of cooling tubes 310 (see FIG. 11 ) of the cooling unit 300 may be disposed between the plurality of S-structure bars 450.

[0128] The plurality of S-structure bars 450 ensure the rigidity of the battery cell assembly 100 and the cooling unit 300, and occupy a predetermined space within the battery pack 1, thereby reducing the amount of filling member 500 (described later) injected. Although the filling member 500 (described later) made of silicone resin is relatively expensive, the use of the plurality of S-structure bars 450 reduces the amount of silicone resin injected, thereby further ensuring cost competitiveness in manufacturing the battery pack 1.

[0129] 2, the filling member 500 may fill the space between the cooling unit 300 and the plurality of battery cells 150 in the height direction (Z-axis direction) of the battery pack 1. Meanwhile, in FIG. 2, the filling member 500 is shown by a hexahedron-shaped dotted line (two-dot thin line) for ease of understanding, and the filling member 500 may fill the entire space between the cooling unit 300 and the plurality of battery cells 150.

[0130] The filling member 500 may more stably fix the battery cells 150 and may also increase the heat dissipation efficiency of the battery cells 150, thereby further improving the cooling performance of the battery cells 150.

[0131] The filling member 500 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 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.

[0132] Specifically, the filling member 500 may be made of a silicone resin, but is not limited thereto, and the filling member 500 may be made of other resin materials that improve the fixing property and heat dissipation efficiency of the battery cell 150, in addition to the silicone resin.

[0133] The filling member 500 may fill 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.

[0134] Here, the filling member 500 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 disconnection or separation space between the bus bar assembly 200 and the battery cell 150.

[0135] As such, the filling member 500 according to this embodiment is continuously filled into the battery cells 150 and the bus bar assembly 200 without any discontinuity, thereby realizing uniform heat distribution without any deviation in heat distribution in the region between the battery cells 150 and the bus bar assembly 200, thereby significantly improving the cooling performance of the battery pack 1.

[0136] In addition, the filling member 500 may be filled to cover the entire S-structure unit 400, which will be described later. Here, the filling member 500 may be continuously filled into the battery cells 150, the bus bar assemblies 200, and the S-structure unit 400 without any discontinuity. This may further improve the cooling performance of the battery pack 1.

[0137] Furthermore, the filling member 500 may be filled to at least partially cover a bottom plate 600, which will be described later. Here, the filling member 500 may be continuously filled in the battery cells 150, the bus bar assembly 200, the cooling unit 300, and the S structure unit 400 without any discontinuity. This may further improve the cooling performance of the battery pack 1.

[0138] Here, the filling member 500 may be continuously filled into the battery cells 150, the bus bar assembly 200, the cooling unit 300, the elongation unit 400, and the bottom plate 600 without any discontinuity, thereby further improving the cooling performance of the battery pack 1.

[0139] More specifically, the filling member 500 covers the portion of the battery cell 150 that is not in contact with the cooling tube 310, thereby inducing thermal equilibrium of the battery cell 150, thereby preventing deviation in cooling of the battery cell 150 and preventing local deterioration of the battery cell 150. Furthermore, by preventing local deterioration of the battery cell 150, the safety of the battery cell 150 can be significantly improved.

[0140] Furthermore, the filling member 500 can play an insulating role in preventing current from flowing to an adjacent battery cell when at least one specific battery cell 150 among the plurality of battery cells 150 is damaged due to an abnormal condition.

[0141] Furthermore, the filling member 500 may include a material having high specific heat performance. Therefore, the filling member 500 increases the thermal mass, thereby delaying a temperature rise of the battery cells 150 and preventing a rapid temperature rise of the battery cells 150 even in a situation such as rapid charging and discharging of the battery cells 150.

[0142] Furthermore, the filler member 500 may include glass bubbles, which can reduce the specific gravity of the filler member 500 and thereby increase the energy density relative to the weight.

[0143] Furthermore, the filling member 500 may include a material with high heat resistance. Therefore, when a thermal event such as overheating occurs in at least one specific battery cell 150 among the plurality of battery cells 150, the filling member 500 can effectively prevent thermal runaway from spreading to an adjacent battery cell.

[0144] Furthermore, the filling member 500 may include a material with high flame retardancy. Therefore, the filling member 500 can minimize the risk of fire when a thermal event such as overheating occurs in at least one specific battery cell 150 among the plurality of battery cells 150.

[0145] Referring back to FIG. 2, the battery pack 1 may further include a bottom plate 600.

[0146] The bottom plate 600 is installed under the structure unit 400 and can support the battery cell assembly 100 and the cooling unit 300. In addition, the bottom plate 600 can ensure the rigidity of the battery pack 1.

[0147] The bottom plate 600 will be described in more detail below.

[0148] 10 is a perspective view of the bottom plate of the battery pack of FIG. 2. FIG.

[0149] Referring to FIG. 10, the bottom plate 600 may include a cell mounting portion 610 and an elastomer support rib 630 .

[0150] The cell mounting portion 610 is formed as an opening of a predetermined size, and a plurality of the cell mounting portions 610 may be provided corresponding to the number of the battery cells 150. The battery cells 150 are placed or inserted into the cell mounting portions 610.

[0151] The S-structure support rib 630 may be provided on the upper surface of the bottom plate 600 and may protrude to a predetermined height to support the bottom of the S-structure unit 400. The S-structure support rib 630 may be formed to a predetermined length along the longitudinal direction (X-axis direction) of the battery cell assembly 100.

[0152] A plurality of the S-structure support ribs 630 are provided, and the cooling unit 300, specifically the cooling tubes 310 of the cooling unit 300, may be disposed between the plurality of S-structure support ribs 630. Therefore, the cooling tubes 310 may be placed between the S-structure support ribs 630 on the upper surface of the bottom plate 600.

[0153] The bottom of the S-structure unit 400 may be placed on the plurality of S-structure support ribs 630. An adhesive material such as a thermal adhesive may be applied to the upper surfaces of the plurality of S-structure support ribs 630 to more stably support the S-structure unit 400.

[0154] FIG. 11 is a diagram for explaining an S structure support rib according to another embodiment of the bottom plate of FIG.

[0155] Referring to FIG. 11, the plurality of S-structure support ribs 650 of the bottom plate 605 may be provided with S-structure insertion grooves 655 of a predetermined depth into which the bottom of the S-structure unit 400 is inserted.

[0156] The S-structure insertion groove 655 may be provided to have a predetermined depth inside the S-structure support rib 650 protruding upward (in the +Z-axis direction) of the bottom plate 605, and may be sized to allow the bottom of the S-structure unit 400 to be inserted therein. When the S-structure unit 400 is fixed to the bottom plate 605, it is inserted into the S-structure insertion groove 655 of the S-structure support rib 650, and can be more stably fixed to the bottom plate 605.

[0157] FIG. 12 is a diagram for explaining the formation of a pack case structure by the filling member of the battery pack of FIG.

[0158] 12, an operator may use a resin injection device I to inject and apply the filling member 500, thereby forming the pack case of the battery pack 1 with the filling member 500 made of the resin material. Here, the filling member 500 may be the silicone resin.

[0159] At this time, in order to facilitate the injection and application of the filling member 500, the battery cell assembly 100, the bus bar assembly 200, the cooling unit 300, the E-structure unit 400, and the bottom plate 600 may be temporarily mounted in a form (not shown) for guiding the injection of the filling member 500 after being assembled with one another. 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 electrode connector 260, the negative electrode connector 270, the coolant inlet / outlet port 370, and one end of the bottom plate 600, to the outside.

[0160] When the filling member 500 hardens within the mold, the filling member 500 can form a pack case that forms the exterior of the battery pack 1, and then the worker or the like can remove the mold.

[0161] Therefore, in this embodiment, by forming the pack case using the filling member 500 made of the potting resin, the assembly process of the battery pack 1 can be simplified compared to the conventional case in which the pack case is formed as a complex assembly of multiple plates, and manufacturing costs can be significantly reduced, ensuring cost competitiveness.

[0162] In addition, in this embodiment, the pack case structure formed by the filling member 500 can reduce the overall size of the battery pack 1 and significantly increase the energy density compared to a conventional cell frame structure composed of an assembly of multiple plates.

[0163] FIG. 13 is a diagram illustrating a battery pack according to another embodiment of the present invention, and FIG. 14 is an exploded perspective view of the battery pack of FIG.

[0164] 13 and 14, a battery pack 2, similar to the battery pack 1 of the above-described embodiment, can be installed in an electric vehicle or a hybrid vehicle as an energy source.

[0165] Since the battery pack 2 according to this embodiment is similar to the battery pack 1 according to the above-described embodiment, the following description of the battery pack 2 according to this embodiment will focus on the differences from the battery pack 1 according to the above-described embodiment.

[0166] The battery pack 1 may include a plurality of battery cells 105 and a busbar assembly 205.

[0167] The plurality of battery cells 105 may be provided as cylindrical secondary batteries, as in the above-described embodiment. Each battery cell 105 will be described in more detail below with reference to the following related drawings.

[0168] 15 is a diagram for explaining a battery cell of the battery pack of FIG. 14, FIG. 16 is a partial cross-sectional view showing the internal structure of the battery cell of FIG. 15, FIG. 17 is a partial cross-sectional view showing the upper structure of the battery cell of FIG. 15, FIG. 18 is a partial cross-sectional view showing the lower structure of the battery cell of FIG. 15, and FIG. 19 is a bottom view of the battery cell of FIG. 15.

[0169] 15 to 19, the battery cell 105 includes an electrode assembly 10, a battery can 20, a cap plate 30, and a first electrode terminal 40. In addition to the above-mentioned components, the battery cell 105 may further include an insulating gasket 50 and / or an upper current collecting plate and / or an insulating plate 70 and / or a lower current collecting plate and / or a sealing gasket 90.

[0170] The electrode assembly 10 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 first electrode plate is a positive or negative electrode plate, and the second electrode plate corresponds to an electrode plate having the opposite polarity to the first electrode plate.

[0171] The electrode assembly 10 may have, for example, a jelly-roll shape. That is, the electrode assembly 10 may be manufactured by sequentially stacking a first electrode plate, a separator, and a second electrode plate at least once to form a stack, and then winding the stack around a winding center C. In this case, a separator may be provided on the outer periphery of the electrode assembly 10 to insulate it from the battery can 20.

[0172] The first electrode plate includes a first electrode current collector and a first electrode active material applied to one or both sides of the first electrode current collector. An uncoated portion where the first electrode active material is not applied exists at one end of the first electrode current collector in the width direction (direction parallel to the Z axis). The uncoated portion functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper part in the height direction (direction parallel to the Z axis) of the electrode assembly 10 housed in the battery can 20.

[0173] The second electrode plate includes a second electrode current collector and a second electrode active material applied to one or both sides of the second electrode current collector. An uncoated portion where the second electrode active material is not applied exists at the other end of the second electrode current collector in the width direction (direction parallel to the Z axis). The uncoated portion functions as a second electrode tab 12. The second electrode tab 12 is provided at the lower part in the height direction (direction parallel to the Z axis) of the electrode assembly 10 housed in the battery can 20.

[0174] The battery can 20 is a cylindrical container having an opening at the bottom and is made of a conductive metal material. The side and top of the battery can 20 are integrally formed. The top of the battery can 20 has a substantially flat shape. The battery can 20 accommodates the electrode assembly 10 and an electrolyte through the opening at the bottom.

[0175] The battery can 20 is electrically connected to the second electrode tab 12 of the electrode assembly 10. Therefore, the battery can 20 has the same polarity as the second electrode tab 12.

[0176] The battery can 20 may have a beading portion 21 and a crimping portion 22 formed at its lower end. The beading portion 21 is formed at the bottom of the electrode assembly 10. The beading portion 21 is formed by pressing the outer circumferential surface of the battery can 20. The beading portion 21 prevents the electrode assembly 10, which has a size corresponding to the width of the battery can 20, from coming out of the opening at the lower end of the battery can 20 and may function as a support portion on which the cap plate 30 is placed.

[0177] The crimping portion 22 is formed below the beading portion 21. The crimping portion 22 extends and is bent to surround the outer circumferential surface of the cap plate 30 disposed below the beading portion 21 and a portion of the lower surface of the cap plate 30.

[0178] The cap plate 30 is a component made of a conductive metal material and covers an opening formed at the bottom of the battery can 20. That is, the cap plate 30 forms the bottom surface of the battery cell 105. The cap plate 30 is placed on a beading portion formed on the battery can 20 and fixed by a crimping portion 22. An airtight gasket 90 for ensuring airtightness of the battery can 20 may be interposed between the cap plate 30 and the crimping portion of the battery can 20.

[0179] The cap plate 30 may further include a vent portion 31 formed to prevent an increase in internal pressure due to gas generated inside the battery can. The vent portion 31 corresponds to a region of the cap plate 30 that is thinner than the surrounding region. The vent portion 31 is structurally weaker than the surrounding region. Therefore, if an abnormality occurs in the battery cell 105 and the internal pressure increases above a certain level, the vent portion 31 ruptures, thereby releasing the gas generated inside the battery can 20.

[0180] The battery cell 105 according to an embodiment of the present invention has a structure in which both a positive electrode terminal and a negative electrode terminal are present at the upper portion, and therefore the structure of the upper portion is more complicated than the structure of the lower portion. Therefore, in order to smoothly exhaust gas generated inside the battery can 20, a vent portion 31 may be formed in a cap plate 30 forming a lower surface of the battery cell 105.

[0181] The vent portion 31 may be formed in a continuous circular shape on the cap plate 30. However, the present invention is not limited thereto, and the vent portion 31 may be formed in a discontinuous circular shape on the cap plate 30, or may be formed in a linear shape or in any other shape.

[0182] The first electrode terminal 40 is made of a conductive metal material, passes through the top surface of the battery can 20, and is electrically connected to the first electrode tab 11 of the electrode assembly 10. Therefore, the first electrode terminal 40 has a first polarity. The first electrode terminal 40 is electrically insulated from the battery can 20, which has a second polarity.

[0183] The first electrode terminal 40 includes an exposed terminal portion 41 and an inserted terminal portion 42. The exposed terminal portion 41 is exposed to the outside of the battery can 20. The exposed terminal portion 41 is located at the center of the upper surface of the battery can 20. The inserted terminal portion 42 penetrates the center of the upper surface of the battery can 20 and is electrically connected to the first electrode tab 11. The inserted terminal portion 42 may be rivet-connected to the inner surface of the battery can 20.

[0184] The upper surface of the battery can 20 and the first electrode terminal 40 have opposite polarities and face the same direction. In addition, a step may be formed between the first electrode terminal 40 and the upper surface of the battery can 20. Specifically, when the upper surface of the battery can 20 is entirely flat or has a shape that protrudes upward from the center, the exposed terminal portion 41 of the first electrode terminal 40 may protrude above the upper surface of the battery can 20. Conversely, when the upper surface of the battery can 20 has a shape that is concave downward from the center, i.e., toward the electrode assembly 10, the upper surface of the battery can 20 may protrude above the exposed terminal portion 41 of the electrode terminal 40.

[0185] The insulating gasket 50 is interposed between the battery can 20 and the first electrode terminal 40 to prevent the battery can 20 and the first electrode terminal 40, which have opposite polarities, from contacting each other. As a result, the upper surface of the battery can 20, which has a substantially flat shape, can function as the second electrode terminal of the battery cell 105.

[0186] The insulating gasket 50 includes an exposed portion 51 and an inserted portion 52. The exposed portion 51 is interposed between the exposed terminal portion 41 of the first electrode terminal 40 and the battery can 20. The inserted portion 52 is interposed between the inserted terminal portion 42 of the first electrode terminal 40 and the battery can 20. The insulating gasket 50 may be made of, for example, an insulating resin material.

[0187] When the insulating gasket 50 is made of a resin material, the insulating gasket 50 may be bonded to the battery can 20 and the first electrode terminal 40 by heat sealing. In this case, the airtightness at the bonding interface between the insulating gasket 50 and the first electrode terminal 40 and the bonding interface between the insulating gasket 50 and the battery can 20 can be strengthened.

[0188] The entire upper surface of the battery can 20 excluding the area occupied by the first electrode terminal 40 and the insulating gasket 50 corresponds to a second electrode terminal 20 a having an opposite polarity to the first electrode terminal 40 .

[0189] The battery cell 105 according to one embodiment of the present invention has, on one side in its longitudinal direction (direction parallel to the Z axis), a first electrode terminal having a first polarity and a second electrode terminal 20a electrically insulated from the first electrode terminal 40 and having a second polarity, arranged side by side. That is, in the battery cell 105 according to one embodiment of the present invention, the pair of electrode terminals 40, 20a are positioned in the same direction, so that when electrically connecting multiple battery cells 105, electrical connection components such as the bus bar assembly 205 described below can be arranged on only one side of the battery cell 105. This simplifies the structure of the battery pack 2 and improves the energy density.

[0190] Hereinafter, the bus bar assembly 205 for electrically connecting with the plurality of battery cells 105 will be described in more detail.

[0191] 20 is an exploded perspective view of a connection bus bar of the bus bar assembly of the battery pack of FIG. 13, FIG. 21 is an enlarged view of a main portion of a bus bar cover of the connection bus bar of FIG. 20, and FIG. 22 is a diagram for explaining a sub-bus bar of the connection bus bar of FIG. 20.

[0192] 20 to 22 and 14, the bus bar assembly 205 may be provided on one side of the battery cell 105, specifically, on the upper side (+Z-axis direction) of the battery cell 105, and may be electrically connected to the plurality of battery cells 105. The electrical connection of the bus bar assembly 205 may be parallel and / or series connection.

[0193] The bus bar assembly 205 is electrically connected to the first electrode terminal 40 (see FIG. 15) having a first polarity of the plurality of battery cells 105 and the second electrode terminal 20a (see FIG. 15) having a second polarity of the battery can 20 (see FIG. 15), and may be electrically connected to an external charge / discharge line, etc., via a connector terminal, etc. Here, the first polarity may be a positive pole, and the second polarity may be a negative pole.

[0194] The configuration of the bus bar assembly 205 will be described in more detail below.

[0195] The bus bar assembly 205 may include main bus bars 215, 225, a connecting bus bar 235, and connectors 260, 270.

[0196] The main bus bars 215, 225 are provided in pair and may be electrically connected to the battery cells 105 arranged at the outermost sides in the longitudinal direction (X-axis direction) of the battery pack 2. The pair of main bus bars 215, 225 may be electrically connected to the connectors 260, 270.

[0197] The connection bus bar 235 may be provided on the upper side of the plurality of battery cells 105 and may be sized to cover all of the plurality of battery cells 105 .

[0198] Such a connecting bus bar 235 may include a bus bar cover 280 and a sub-bus bar 290 .

[0199] The bus bar cover 280 covers the upper sides (+Z-axis direction) of the plurality of battery cells 105 and may be provided in a substantially flat plate shape. The bus bar cover 280 may cover sub-bus bars 290, which will be described later. The shape and size of the bus bar cover 280 may vary depending on the number and capacity of battery cells 105 required for the battery pack 2.

[0200] The bus bar cover 280 may be made of an insulating material. For example, the bus bar cover 280 may be made of a polyimide film. However, the bus bar cover 280 is not limited thereto, and it goes without saying that the bus bar cover 280 may be made of other insulating members.

[0201] The bus bar covers 280 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 2. Here, a sub-bus bar 290, which will be described later, may be inserted between the pair of bus bar covers 280.

[0202] The bus bar cover 280 may be provided with a bus bar hole 285 .

[0203] The busbar holes 285 may guide electrical connection between the battery cells 105 and sub-busbars 290, which will be described later. The busbar holes 285 may have an opening space of a predetermined size and may be provided in plurality. A positive electrode connection part 294 and a negative electrode connection part 296, which will be described later, may be disposed in each of the plurality of busbar holes 285. The busbar holes 285 may be formed to have an opening space larger than the combined size of the positive electrode connection part 294 and the negative electrode connection part 296, which will be described later, in order to improve process operability and injection efficiency of the filler member 500, which will be described later.

[0204] The busbar holes 285 may include a main hole 287 and an auxiliary hole 288 .

[0205] The main hole 287 may be formed to have an opening space of a predetermined size within the bus bar cover 280. The main hole 287 may have a substantially circular shape and may be formed to have an opening space larger than the positive electrode connection part 294. Specifically, the main hole 287 may be formed to have an opening space larger than the combined size of the positive electrode connection part 294 and the negative electrode connection part 296. The positive electrode connection part 294 and an inner portion of an upper edge of a battery cell 105, which will be described later, may be disposed in the main hole 287.

[0206] The auxiliary hole 288 may extend from one end of the main hole 287 and may be formed to have a groove-shaped opening space of a predetermined size. The opening space of the auxiliary hole 288 may be at least the same as or larger than the size of a negative electrode connecting part 296, which will be described later. The negative electrode connecting part 296, which will be described later, and a portion of an upper edge of the battery cell 105 may be disposed in the auxiliary hole 288.

[0207] The positive electrode connection portion 294 and the negative electrode connection portion 296 of the sub-busbar 290 described later, which are opposed to each other in the longitudinal direction (X-axis direction) of the connection busbar 235, can be simultaneously placed in the internal opening space of the main hole 287 and the auxiliary hole 288 of such a busbar hole 285.

[0208] The sub-busbar 290 is for electrically connecting to the first electrode terminal 20a, which is the positive electrode, and the second electrode terminal 20a, which is the negative electrode, of the plurality of battery cells 105, and may be provided on the upper side of the busbar cover 280 or may be inserted into a pair of busbar covers 280.

[0209] The sub-busbar 290 may be provided as a single layer in the form of a strip having a predetermined length and width. In the following, in this embodiment, the description will be limited to the sub-busbar 290 inserted into the pair of busbar covers 280.

[0210] The connection between the sub-busbar 290 and the positive electrode 40 of the battery cell 105 and the connection between the sub-busbar 290 and the negative electrode 20 a of the battery cell may be performed in the open space of the busbar hole 285 .

[0211] Hereinafter, the sub-busbar 290 according to this embodiment will be described in more detail.

[0212] A plurality of such sub-bus bars 290 may be provided, each of which may include a bus bar bridge 292, a positive electrode connection portion 294, and a negative electrode connection portion 296.

[0213] The bus bar bridge 292 may be provided in a strip shape having a predetermined length and width. The bus bar bridge 292 may be inserted into the pair of bus bar covers 280 and formed to have a predetermined length along the width direction (Y-axis direction) of the battery pack 2. The bus bar bridge 292 may have a shape corresponding to the arrangement structure of the battery cells 105 in the width direction (Y-axis direction) of the battery pack 2 to improve the efficiency of electrical connection with the battery cells 105. Therefore, in this embodiment, the bus bar bridge 292 may be arranged in a zigzag shape in the width direction (Y-axis direction) of the battery pack 2.

[0214] The bus bar bridge 292 may be made of a conductive material. For example, the bus bar bridge 292 may be made of a metal material such as aluminum or copper. However, the bus bar bridge 292 is not limited thereto, and may be made of other materials for electrical connection.

[0215] The positive electrode connection portion 294 may extend and protrude integrally from the bus bar bridge 292 and may be disposed in a main hole 287 in the bus bar hole 285. The positive electrode connection portion 294 may be electrically connected to a first electrode terminal 40 (see FIG. 14 ), which is the positive electrode of the battery cell 105. The electrical connection may be performed by a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0216] The connection between the positive electrode connector 294 and the positive electrode 40 of the battery cell 105 is performed in the open space of the main hole 287 of the busbar hole 285, so that during the connection, a welding process or the like for the connection can be performed directly in the open space without any additional process.

[0217] The negative electrode connection portion 296 may extend integrally from the bus bar bridge 292, protrude in the opposite direction from the positive electrode connection portion 294, and be disposed in an auxiliary hole 288 of the bus bar hole 285. The negative electrode connection portion 296 may be electrically connected to a second electrode terminal 20a (see FIG. 14 ), which is the negative electrode of the battery cell 105. The electrical connection may be performed by a welding process for electrical connection, such as laser welding or ultrasonic welding.

[0218] The connection between the negative electrode connection part 296 and the negative electrode 20a of the battery cell 105 is performed in the opening space of the auxiliary hole 288 of the busbar hole 285, so that during the connection, a welding process for the connection can be performed directly in the opening space without any additional process.

[0219] The connectors 260 and 270 are similar to those in the above-described embodiment, and therefore, a duplicated description will be omitted below.

[0220] Hereinafter, the mechanism of injecting the filler material 500 through the busbar hole 285 of the busbar cover 280 of the connection busbar 235 of the busbar assembly 205 of the present invention will be described in more detail.

[0221] 23 and 24 are diagrams for explaining the injection of the filler material through the busbar holes in the busbar covers of the connection busbars of FIG.

[0222] 23 , when the connection bus bar 235 is attached, the connection bus bar 235 may be placed on the upper side of the plurality of battery cells 105. At this time, upper surfaces of the battery cells 105, on which the positive electrodes 40 and negative electrodes 20a of the battery cells 105 are provided, may be disposed in the bus bar holes 285 of the bus bar cover 280 of the connection bus bar 235. In addition, the positive electrode connection portion 294 of the sub-bus bar 290 and the negative electrode connection portion 296 of the sub-bus bar 290, which face each other in the longitudinal direction (X-axis direction) of the connection bus bar 235, may be disposed in the bus bar holes 285 of the bus bar cover 280 of the connection bus bar 235.

[0223] This allows workers to more easily and accurately perform welding processes above the busbar hole 285 when performing welding processes for electrically connecting the positive electrode 40 of the battery cell 105 to the positive electrode connection portion 294 of the sub-busbar 290, and for electrically connecting the negative electrode 20a of the battery cell 105 to the negative electrode connection portion 296 of the sub-busbar 290.

[0224] Therefore, in this embodiment, the busbar hole 285, which allows the positive electrode 40 and negative electrode 20a of the battery cell 105 and the positive electrode connection portion 294 and negative electrode connection portion 296 of the sub-busbar 290 to be all positioned above the connection busbar 235 (in the +Z-axis direction), can significantly improve the efficiency of the welding process.

[0225] 24 , after the bus bar assembly 205 is electrically connected, the worker may inject and apply the filling member 500 from one side (+Z-axis direction) of the bus bar assembly 205, specifically, from the upper side (+Z-axis direction) of the connection bus bar 235 toward the battery cells 105 using a resin injection device (I). Here, the filling member 500 may be filled into the spaces between the battery cells 105 through the bus bar holes 285 from one side (+Z-axis direction) of the bus bar assembly 205, i.e., from the upper side (+Z-axis direction) of the connection bus bar 235.

[0226] In this embodiment, the opening space of the busbar hole 285 of the busbar cover 280 is formed to be large enough to accommodate all of the positive electrode 40 and negative electrode 20a of the battery cell 105 and the positive electrode connecting portion 294 and negative electrode connecting portion 296 of the sub-busbar 290, thereby further ensuring an area for injecting and applying the filler member 500 to the battery cell side, as will be described later. Therefore, in this embodiment, the efficiency of injecting and applying the filler member 500 through the busbar hole 285 can be significantly improved.

[0227] Meanwhile, the filling member 500 may be filled to cover the entire upper side (+Z-axis direction) of the busbar assembly 200. However, without being limited thereto, the filling member 500 may be filled only up to an area that can cover the busbar holes 285 of the connection busbars 235 of the busbar assembly 200.

[0228] Referring back to FIG. 14, the battery pack 2 may include a cooling unit 300, an e-structure unit 405, and a filling member 500.

[0229] The cooling unit 300 is substantially the same as or similar to the above-described embodiment, and therefore, a duplicated description will be omitted below.

[0230] The S-structure units 405 may be provided in pairs. The pair of S-structure units 405 may have an accommodation space for accommodating the plurality of battery cells 105. The plurality of battery cells 105 and the cooling unit 300 may be disposed between the pair of S-structure units 405.

[0231] The filling member 500 may be filled in the spaces between the battery cells 105 and at least partially cover the bus bar assembly 205. The filling member 500 may be made of silicone resin, as in the above-described embodiment. The filling member 500 may be filled to form the structure of a pack case of the battery pack 2, as in the above-described embodiment.

[0232] In addition, the filling member 500 may be filled to cover the battery cells and the cooling unit 300 disposed between the S-structure units 405 while exposing the outer surfaces of the S-structure units 405.

[0233] FIG. 25 is a diagram illustrating a vehicle according to an embodiment of the present invention.

[0234] Referring to FIG. 25, the vehicle V may be an electric vehicle or a hybrid vehicle and may include at least one battery pack 1, 2 of the above-described embodiments as an energy source.

[0235] In this embodiment, the battery packs 1 and 2 described above have a compact structure with high energy density, which makes it easy to realize a modular structure of multiple battery packs 1 and 2 when installed in the automobile V, and ensures a relatively high degree of installation freedom even in various shapes of the interior space of the automobile V.

[0236] As described above, according to the various embodiments described above, it is possible to provide a busbar assembly that can increase energy density while ensuring rigidity, and a battery pack and a vehicle including the busbar assembly.

[0237] Furthermore, according to the various embodiments described above, it is possible to provide a busbar assembly that can improve cost competitiveness and manufacturing efficiency, a battery pack including the same, and a vehicle.

[0238] Furthermore, according to the various embodiments described above, it is possible to provide a busbar assembly capable of improving cooling performance, a battery pack including the same, and a vehicle.

[0239] While preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and it goes without saying that various modifications can be made by a person having ordinary skill in the art to which the invention pertains without departing from the gist of the present invention as claimed in the claims, and these modified embodiments should not be understood individually from the technical ideas and perspectives of the present invention. [Explanation of symbols]

[0240] 1 battery pack 2 battery packs 10 Electrode assembly 11 First electrode tab 12 Second electrode tab 20 Battery can, electrode terminal, negative electrode, second electrode terminal 21 Beading section 22 Crimping section 30 Cap Plate 31 Vent section 40 Electrode terminal, first electrode terminal, positive electrode 41 Exposed terminal section 42 Insertion terminal part 50 Insulation gasket 51 Exposed part 52 Insertion section 70 Insulation Plate 90 Airtight gaskets, sealing gaskets 100 Battery Cell Assembly 105 battery cells 150 battery cells 155 battery cells 160 Electrode assembly 162 First electrode tab 164 Second electrode tab 170 Battery can, negative electrode 171 Beading section 172 Crimping section 173 Upper edge 175 positive electrode, top cap 180 Airtight Gasket 185 Current collecting plate 187 leads 190 Insulation Plate 193 Lead Hole 195 Connecting Plate 197 Metal Washer 199 Insulating Washer 200 Busbar Assembly 205 Busbar Assembly 210 Main positive bus bar, main bus bar 215 Main busbar 220 Main negative bus bar, main bus bar 225 Main Busbar 230 connecting busbar 235 connecting busbar 242 Layer Body 246 Electrode connection part, positive electrode connection part 248 Electrode connection part, negative electrode connection part 249 Guide groove 250 Cooling unit insertion slit 260 Positive Connector 270 Negative Connector 280 Busbar Cover 285 Busbar Hall 287 Main Hall 288 Auxiliary Hall 290 Sub-bass bar 292 Busbar Bridge 294 Positive electrode connection 296 Negative electrode connection 300 Cooling Unit 310 Cooling tube 312 Convex part 316 Recess 350 Cooling Channel 352 Upper Channel 354 Lower flow passage 356 Connecting Channel 370 Cooling water inlet / outlet 372 Inlet / Outlet Body 374 Cooling water supply port 376 Cooling water discharge port 390 Connecting Pipe 400 S-Structure Unit 405 S-Structure Unit 450 S-structure bar 500 Filler 600 bottom plate 605 bottom plate 610 Cell mounting part 630 S-structure support rib 650 S-structure support rib 655 S-structure insertion groove

Claims

1. a plurality of battery cells; a bus bar assembly disposed on one side of the battery cell and electrically connecting the battery cell; Including, The busbar assembly includes: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, The positive electrode connecting portion is disposed in the main hole, and the negative electrode connecting portion is disposed in the auxiliary hole.

2. a plurality of battery cells; a bus bar assembly disposed on one side of the battery cell and electrically connecting the battery cell; Including, The busbar assembly includes: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, The opening space of the main hall is The battery pack is larger than the positive electrode connection portion.

3. a plurality of battery cells; a bus bar assembly disposed on one side of the battery cell and electrically connecting the battery cell; Including, The busbar assembly includes: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, The opening space of the auxiliary hole is: The battery pack has a size at least equal to or larger than the negative electrode connection portion.

4. The battery pack according to any one of claims 1 to 3, further comprising a filling member that fills spaces between the plurality of battery cells and at least partially covers the bus bar assembly.

5. The filling member is The battery pack according to claim 4 , wherein spaces between the battery cells are filled through the busbar holes on one side of the busbar assembly.

6. The battery pack according to any one of claims 1 to 3, wherein the negative electrode connecting portion protrudes in a direction opposite to that of the positive electrode connecting portion.

7. The battery pack according to claim 1 , wherein an inner portion of an upper edge of the battery cell, on which the positive electrode is formed, is disposed in the main hole.

8. The bus bar cover is They are provided in pairs, The sub-busbar is The battery pack according to any one of claims 1 to 3, which is inserted between the pair of bus bar covers.

9. The sub-busbar is The battery pack according to any one of claims 1 to 3, which is provided as a strip-shaped single layer having a predetermined length and width.

10. 1. A busbar assembly for electrical connection of battery cells of a battery pack, comprising: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, the positive electrode connection portion is disposed in the main hole, and the negative electrode connection portion is disposed in the auxiliary hole.

11. 1. A busbar assembly for electrical connection of battery cells of a battery pack, comprising: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, The opening space of the main hall is A bus bar assembly having a size larger than that of the positive electrode connection portion.

12. 1. A busbar assembly for electrical connection of battery cells of a battery pack, comprising: a sub-bus bar for electrically connecting the positive and negative electrodes of the battery cell; a busbar cover covering the sub-busbar and having a busbar hole for guiding an electrical connection between the sub-busbar and the battery cell; Including, The busbar hole is a main hole formed in the bus bar cover to have an opening space of a predetermined size within the bus bar cover; an auxiliary hole extending from one end of the main hole and having a groove-shaped opening space of a predetermined size; Including, the sub-busbars are connected to the positive electrodes of the battery cells and the sub-busbars are connected to the negative electrodes of the battery cells through open spaces of the busbar holes; The sub-busbar is a band-shaped busbar bridge having a predetermined length and width; a positive electrode connection portion that extends integrally from the bus bar bridge and protrudes, and that connects to the positive electrode of the battery cell; a negative electrode connection portion that integrally extends and protrudes from the bus bar bridge and connects to the negative electrode of the battery cell; Including, The opening space of the auxiliary hole is: A busbar assembly having a size at least equal to or larger than the negative electrode connection portion.

13. A motor vehicle comprising at least one battery pack according to any one of claims 1 to 3.

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