Battery device and method for manufacturing a battery device

Abstract

The present invention provides a battery device in which excessive heat generation is suppressed and performance is improved, as well as a method for manufacturing such a battery device. [Solution] A battery device according to one embodiment of the present disclosure includes a plurality of battery cells 110, each having a plurality of electrode leads 111; busbar members 120a, 120b, 120c connected to the plurality of electrode leads; and a busbar frame 130 supporting the busbar members, wherein the busbar frame includes a support surface 131 facing the busbar members, and the support surface may include at least one cooling groove 132.

Description

Technical Field

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[0001] The present disclosure relates to a battery device and a method for manufacturing the battery device.

Background Art

[0002] Batteries are widely used not only in small electronic devices such as mobile phones and laptop computers, but also in medium and large mechanical devices such as electric vehicles (EVs) and energy storage devices, and have the advantage of being rechargeable and reusable.

[0003] An electrode assembly including a positive electrode plate and a negative electrode plate can be housed in a case selected according to the purpose of use, such as a pouch type, a square type, or a cylindrical type, and an electrolytic solution can be injected to manufacture a battery cell.

[0004] A battery device can be configured by connecting a plurality of battery cells to a bus bar. The battery device can be, for example, a battery module and / or a battery pack.

[0005] The region where the battery cell and the bus bar are connected can generate heat. If the heat generation continues and the temperature of the battery device becomes higher than the appropriate level, the performance of the battery device may deteriorate. Furthermore, the electrical stability and the safety in use of the battery device may deteriorate.

Summary of the Invention

Problems to be Solved by the Invention

[0006] According to one aspect of the present disclosure, there are provided a battery device in which excessive heat generation is suppressed and the performance is improved, and a method for manufacturing such a battery device.

[0007] Also, according to one aspect of the present disclosure, there are provided a battery device in which the electrical stability and the safety in use are improved, and a method for manufacturing such a battery device.

[0008] Furthermore, this disclosure can be widely applied to green technology fields such as solar power generation and wind power generation.

[0009] Furthermore, this disclosure can be applied to environmentally friendly devices such as eco-friendly electric vehicles and hybrid vehicles that suppress air pollution and greenhouse gas emissions and prevent climate change. [Means for solving the problem]

[0010] A battery device according to one embodiment of the present disclosure includes a plurality of battery cells, each having a plurality of electrode leads; a busbar member connected to the plurality of electrode leads; and a busbar frame supporting the busbar member, wherein the busbar frame includes a support surface facing the busbar member, and the support surface may include at least one cooling groove.

[0011] In one embodiment, the plurality of battery cells include an outer casing that houses an electrode assembly, and a plurality of electrode leads connected to the electrode assembly and extended to the outside of the outer casing, wherein the support surface and the at least one cooling groove do not face the outer casing.

[0012] In one embodiment, the at least one cooling groove may be positioned above the plurality of electrode leads in the height direction of the battery cell in the width direction cross-section of the battery cell.

[0013] In one embodiment, the present invention may further include a heat insulating member disposed in the at least one cooling groove.

[0014] In one embodiment, the outer shape of the at least one cooling groove may be polygonal in the cross-section in the thickness direction of the battery cell.

[0015] In one embodiment, the outer shape of the at least one cooling groove can include a curve in the cross-section in the thickness direction of the battery cell.

[0016] In one embodiment, the busbar frame may further include at least one exhaust groove connected to the at least one cooling groove and extending toward an area not facing the busbar member.

[0017] In one embodiment, the at least one exhaust groove may include a first exhaust groove connected to one side of the at least one cooling groove and extending in a direction parallel to the thickness direction of the battery cell, and a second exhaust groove connected to the other side of the at least one cooling groove and extending in a direction intersecting the first exhaust groove.

[0018] In one embodiment, at least one of the first exhaust groove and the second exhaust groove can extend to the edge of the busbar frame.

[0019] In one embodiment, the busbar member may include a plurality of connecting busbar members arranged on one and the other side of the battery cell to connect a pair of adjacent electrode leads; a first outermost busbar member arranged on one or the other side of the battery cell to connect to a first outermost battery cell located on the outermost side of the plurality of battery cells; and a second outermost busbar member arranged on one or the other side of the battery cell to connect to a second outermost battery cell located on the outermost side of the plurality of battery cells.

[0020] In one embodiment, the at least one cooling groove includes a plurality of cooling grooves, and the plurality of cooling grooves can face the first outermost busbar member and the second outermost busbar member.

[0021] In one embodiment, in the height direction of the battery cell, the heights of the first outermost bus bar member and the second outermost bus bar member may be higher than the height of at least one of the plurality of connection bus bar members.

[0022] In one embodiment, the at least one cooling groove may include a region that exceeds the height of the at least one connection bus bar member in the height direction of the battery cell.

[0023] In one embodiment, the at least one cooling groove includes a plurality of cooling grooves, and the plurality of cooling grooves can face the plurality of connection bus bar members.

[0024] On the other hand, as another aspect of the present disclosure, there is provided a method for manufacturing a battery device including a plurality of battery cells each including a plurality of electrode leads, a bus bar member connected to the plurality of electrode leads, and a bus bar frame supporting the bus bar member.

[0025] The method for manufacturing a battery device according to an embodiment of the present disclosure may include a preparation step of preparing the bus bar frame in which at least one cooling groove is formed on a support surface supporting the bus bar member, and an electrode lead connection step of connecting the plurality of electrode leads to the bus bar member.

Effects of the Invention

[0026] According to one aspect of the present disclosure, it is possible to provide a battery device in which excessive heat generation is suppressed and performance is improved, and a method for manufacturing such a battery device.

[0027] Also, according to one aspect of the present disclosure, it is possible to provide a battery device in which electrical stability and safety in use are improved, and a method for manufacturing such a battery device.

[0028] Further, the present disclosure can be widely applied in the field of green technologies such as solar power generation and wind power generation.

[0029] Furthermore, this disclosure can be applied to environmentally friendly devices such as eco-friendly electric vehicles and hybrid vehicles that suppress air pollution and greenhouse gas emissions and prevent climate change. [Brief explanation of the drawing]

[0030] [Figure 1] This is a schematic perspective view of a battery device according to one embodiment of the present disclosure. [Figure 2] This figure schematically shows a cross-section along the line I-I' in Figure 1. [Figure 3] This figure schematically shows a cross-section along the line II-II' in Figure 2. [Figure 4] This figure schematically shows a busbar frame, busbar member, and electrode lead according to one embodiment of the present disclosure. [Figure 5] This diagram schematically shows a cross-section along line II-II' of a battery device according to yet another embodiment of the present disclosure. [Figure 6] This diagram schematically shows a busbar frame, busbar member, and electrode lead according to yet another embodiment of the present disclosure. [Figure 7] This diagram schematically shows a busbar frame, busbar member, and electrode lead according to yet another embodiment of the present disclosure. [Figure 8] This diagram schematically shows a busbar frame, busbar member, and electrode lead according to yet another embodiment of the present disclosure. [Figure 9] This is a schematic exploded perspective view of a battery device according to yet another embodiment of the present disclosure. [Figure 10] This diagram schematically illustrates a method for manufacturing a battery device according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0031] To aid in understanding the descriptions of the embodiments of this disclosure, elements indicated by the same reference numerals in the accompanying drawings are the same elements. Some components in the accompanying drawings are exaggerated, omitted, or shown schematically, and the size of each component does not fully reflect its actual size.

[0032] Furthermore, in order to clarify the gist of this disclosure, explanations of elements and technologies that are well known in the prior art will be omitted, and the following will provide a detailed explanation of this disclosure with reference to the attached drawings.

[0033] In the following diagrams, the X-axis represents the thickness direction of the battery cell 110, the Y-axis represents the width direction of the battery cell 110, and the Z-axis represents the height direction of the battery cell 110. However, these directions are arbitrarily set for ease of understanding, and the above directions may be changed.

[0034] Figure 1 is a schematic perspective view of a battery device 100 according to one embodiment of the present disclosure, and Figure 2 shows a schematic cross-section along the line I-I' in Figure 1. In Figure 2, the battery cell 110 and electrode lead 111 are not shown in cross-section.

[0035] As shown in Figures 1 and 2, a battery device 100 according to one embodiment of the present disclosure may include a plurality of battery cells 110, each having a plurality of electrode leads 111, a busbar member 120 connected to the plurality of electrode leads 111, and a busbar frame 130 supporting the busbar member 120. The busbar frame 130 may include a support surface 131 facing the busbar member 120, and the support surface 131 may include at least one cooling groove 132 for cooling the busbar member 120.

[0036] Multiple battery cells 110 may be stacked or arranged in the thickness direction (X direction) of the battery cells 110.

[0037] The battery cell 110 may be a secondary battery, or it may be a lithium-ion battery cell 110. The battery cell 110 may also be a pouch-type battery cell 110. The battery cell 110 may contain an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator membrane, and an electrolyte, inside the outer casing material 112. The outer casing material 112 may be in the form of a film or a sheet, and may be sealed once the electrode assembly and electrolyte are housed inside.

[0038] The battery cell 110 may be a bidirectional battery cell 110 or a unidirectional battery cell 110, depending on the position in which the electrode leads 111 are drawn out from the outer casing material 112.

[0039] In the following explanation, we will use a bidirectional battery cell 110 as an example, in which one electrode lead 111 is drawn out from one side of the outer casing 112, and another electrode lead 111 is drawn out from the other side of the outer casing 112. Here, one of the electrode leads 111 may be connected to a positive electrode plate housed inside the outer casing 112, and the other electrode lead 111 may be connected to a negative electrode plate housed inside the outer casing 112.

[0040] However, the types of battery cells 110 are not necessarily limited by this disclosure, and the battery cells 110 can be transformed into other forms other than secondary batteries, lithium-ion battery cells 110, and pouch-type battery cells 110.

[0041] The busbar frame 130 can support the busbar member 120. The busbar frame 130 may be made of an electrically insulating material. For example, the busbar frame 130 may be an injection molded part. Depending on the circumstances, the busbar frame 130 may be double injection molded or insert injection molded. Double injection molding may be an injection molding method in which multiple resins of different types are injected. However, the molding method for the busbar frame 130 is not necessarily limited by this disclosure.

[0042] The busbar member 120 may be made of an electrically conductive material. There may be multiple busbar members 120. One of the busbar members 120 may be connected to one of the electrode leads 111 connected to the positive electrode plate of the battery cell 110, and another busbar member 120 may be connected to yet another electrode lead 111 connected to the negative electrode plate of the battery cell 110. By this principle, multiple busbar members 120 can be electrically connected to the battery cell 110.

[0043] The busbar member 120 may include a first slot 121 through which the electrode lead 111 passes. The first slot 121 may be a hole, slit, or the like that passing through the busbar member 120. The electrode lead 111 can be bent in a direction toward the busbar member 120 after passing through the first slot 121, and then welded to the busbar member 120. The direction in which the electrode lead 111 is bent is not necessarily limited by this disclosure.

[0044] The busbar member 120 can contact the support surface 131 of the busbar frame 130. Furthermore, if there are multiple busbar members 120, multiple busbar members 120 can contact the support surface 131 of the busbar frame 130. The busbar member 120 may be fixed to the busbar frame 130 by contacting the support surface 131.

[0045] The support surface 131 does not have to face the battery cell 110 or the area in the battery cell 110 where the electrode assembly is housed.

[0046] In one embodiment, the support surface 131 may be provided with at least one cooling groove 132. The cooling groove 132 may be a groove formed in a concave shape on the support surface 131 in a direction toward at least one of the following: the center of gravity of the busbar frame 130, the centroid of the busbar frame 130, and the region in the battery cell 110 in which the electrode assembly is housed.

[0047] The centroid of the busbar frame 130 may be the centroid of the rectangle in the XZ plane, which is perpendicular to or intersects the thickness direction of the battery cell 110, when the outline of the busbar frame 130 is rectangular.

[0048] However, since the busbar frame 130 is a polyhedron having a constant width in the width direction (Y direction) of the battery cell 110, the centroid of the busbar frame 130 can be located at a position moved by a certain distance from the above plane (XZ plane) or support surface 131 in the +Y direction, in the direction toward the battery cell 110, or away from the support surface 131.

[0049] The busbar frame 130 can be separated from the busbar member 120 in the region where the cooling groove 132 is located on the support surface 131. The cooling groove 132 separates the busbar frame 130 from the busbar member 120 and allows airflow. Therefore, the cooling groove 132 can cool the busbar member 120. Thus, excessive heat generation of the battery device 100 can be suppressed. This can contribute to improving the electrical performance and electrical stability of the battery device 100.

[0050] Furthermore, it is possible to prevent the busbar frame 130 from being carbonized or melted due to excessive heat generation from the busbar member 120.

[0051] In one embodiment, the busbar member 120 may include a plurality of connecting busbar members 120c arranged on one side 10a and the other side 10b of the battery cell 110, respectively, connecting a pair of adjacent electrode leads 111; a first outermost busbar member 120a arranged on one side 10a or the other side 10b of the battery cell 110 and connected to a first outermost battery cell 114 located on the outermost side of one of the plurality of battery cells 110; and a second outermost busbar member 120b arranged on one side 10a or the other side 10b of the battery cell 110 and connected to a second outermost battery cell 115 located on the outermost side of the other of the plurality of battery cells 110.

[0052] In one embodiment, there may be multiple busbar frames 130. One of the multiple busbar frames 130 may be located on one side 10a of the battery cell 110, and another busbar frame 130 may be located on the other side 10b of the battery cell 110. Each support surface 131 of the multiple busbar frames 130 does not have to face the battery cell 110 or the area in the battery cell 110 where the electrode assembly is housed. Alternatively, each support surface 131 of the multiple busbar frames 130 does not have to face the area in the exterior material 112 where the electrode assembly is housed. However, each support surface 131 of the multiple busbar frames 130 can face the battery cell 110 or the area in the battery cell 110 where the electrode assembly is housed. Here, "opposing" can mean that, in the cross-section (YZ plane) in the thickness direction of the busbar frame 130, any component (for example, the inner surface 131a of the busbar frame) is placed between each support surface 131 of the multiple busbar frames 130 and the region in which the electrode assembly of the battery cell 110 is housed, and that the support surfaces 131 of the multiple busbar frames 130 and the region in which the electrode assembly of the battery cell 110 is housed do not directly face each other.

[0053] In other words, the support surfaces 131 of each of the multiple busbar frames 130 can face each other across the battery cell 110 or the region in the battery cell 110 where the electrode assembly is housed, with the respective inner surfaces 131a of the multiple busbar frames 130 in between. Also, in the cross-section in the thickness direction (YZ plane) of the busbar frame 130, the respective inner surfaces 131a of the multiple busbar frames 130 may be positioned between the support surfaces 131 of the multiple busbar frames 130 and the space 113 where the electrode assembly is housed.

[0054] A pair of adjacent electrode leads 111 can be adjacent to each other in the thickness direction (X direction) of the battery cell 110. A pair of electrode leads 111 can be adjacent to each other on one side 10a of the battery cell 110, and a pair of electrode leads 111 can also be adjacent to each other on the other side 10b of the battery cell 110. A pair of adjacent electrode leads 111 on one side 10a of the battery cell 110 can be connected to each other by one of the busbar members 120, and a pair of adjacent electrode leads 111 on the other side 10b of the battery cell 110 can be further connected to each other by another busbar member 120.

[0055] With respect to one battery cell 110, one side 10a of the battery cell 110 may be a region from which one electrode lead 111 is drawn, and the other side 10b of the battery cell 110 may be a region from which yet another electrode lead 111 is drawn. In a bidirectional battery cell 110, one electrode lead 111 and the other electrode lead 111 do not have to face each other. Also, in a bidirectional battery cell 110, a region containing an electrode assembly may be located between one electrode lead 111 and the other electrode lead 111.

[0056] In one embodiment, multiple battery cells 110 can be connected in series. Furthermore, on one side 10a of the battery cell 110, the respective electrode leads 111 of a pair of adjacent battery cells 110 can be connected by one connecting busbar member 120c. Additionally, on the other side 10b of the battery cell 110, the respective electrode leads 111 of a pair of adjacent battery cells 110 can be connected by yet another connecting busbar member 120c.

[0057] In one embodiment, the multiple electrode leads 111 connected to a single connecting busbar member 120c on one side 10a of the battery cell 110 can have electrically different polarities. For example, on one side 10a of the battery cell 110, of a pair of adjacent battery cells 110, the electrode leads 111 of one battery cell 110 may be connected to the positive electrode plate, while the electrode leads 111 of the other battery cell 110 may be connected to the negative electrode plate. Also, on the other side 10b of the battery cell 110, of a pair of adjacent battery cells 110, the electrode leads 111 of one battery cell 110 may be connected to the positive electrode plate, while the electrode leads 111 of the other battery cell 110 may be connected to the negative electrode plate.

[0058] In this case, in a pair of battery cells 110 where the electrode leads 111 are connected by a single connecting busbar member 120c on one side 10a of the battery cell 110, the electrode leads 111 on the other side 10b of the battery cell 110 may not be connected to each other by the connecting busbar member 120c.

[0059] In yet another embodiment, multiple electrode leads 111 connected to a single connecting busbar member 120c may have the same electrical polarity. For example, the electrode leads 111 of a pair of battery cells 110 adjacent to each other on one side 10a of the battery cell 110 may be connected to a positive electrode plate, and electrode leads 111 connected to a positive electrode plate may be connected to a single connecting busbar member 120c.

[0060] Furthermore, the electrode leads 111 of a pair of adjacent battery cells 110 on the other side 10b of the battery cell 110 may be connected to the negative electrode plate, and the electrode leads 111 connected to the negative electrode plate can be further connected to another connecting busbar member 120c.

[0061] As described above, the multiple battery cells 110 may be connected in parallel or in series, but the method of connecting the multiple battery cells 110 is not necessarily limited by this disclosure.

[0062] In one embodiment, the first outermost busbar member 120a and the second outermost busbar member 120b can be located on one side 10a of the battery cell 110. For example, the first outermost busbar member 120a can be connected to the positive electrode lead 111 connected to the positive electrode plate of the first outermost battery cell 114, and the second outermost busbar member 120b can be connected to the negative electrode lead 111 connected to the negative electrode plate of the second outermost battery cell 115. However, these connection relationships may be substituted for each other.

[0063] Specifically, the multiple battery cells 110 may include a first outermost battery cell 114 located on one side (+X direction) in the stacking direction of the battery cells 110 when the multiple battery cells 110 are stacked, and a second outermost battery cell 115 located on the other side (-X direction) in the stacking direction of the battery cells 110.

[0064] In multiple battery cells 110, the remaining busbar members 120, excluding the first outermost busbar member 120a and the second outermost busbar member 120b, may be connecting busbar members 120c. The connecting busbar members 120c may be connected to electrode leads 111 that are not connected to the first outermost busbar member 120b and electrode leads 111 that are not connected to the second outermost busbar member 120b.

[0065] In the first outermost battery cell 114, any other electrode leads 111 that are not connected to the first outermost busbar member 120a may be connected to a connecting busbar member 120c on the other side 10b of the battery cell 110. Then, any one electrode lead 111 of any other battery cell 110 adjacent to the first outermost busbar member 120a in the -X direction can be connected to the connecting busbar member 120c.

[0066] In the second outermost battery cell 115, any other electrode leads 111 that are not connected to the second outermost busbar member 120b may be connected to a connecting busbar member 120c on the other side 10b of the battery cell 110. Then, any one electrode lead 111 of any other battery cell 110 adjacent to the second outermost busbar member 120b in the +X direction can be connected to the connecting busbar member 120c.

[0067] As an example, a single connecting busbar member 120c may be provided with a pair of first slots 121. Electrode leads 111 of different battery cells 110 may be inserted into each first slot 121. This allows a pair of adjacent battery cells 110 to be electrically connected.

[0068] In the cross-section (XY plane) of the battery cell 110 in the thickness direction, multiple electrode leads 111 can be connected to different busbar members 120 with respect to one battery cell 110. For example, in the first outermost battery cell 114, one electrode lead 111 may be connected to the first outermost busbar member 120a, while other electrode leads 111 may be connected to a connecting busbar member 120c.

[0069] Furthermore, using another battery cell 110 adjacent to the first outermost busbar member 120a in the -X direction as a reference, one electrode lead 111 can be connected to a connecting busbar member 120c on the other side 10b of the battery cell 110 to which the electrode lead 111 of the first outermost battery cell 114 is connected, and another electrode lead 111 can be connected to yet another connecting busbar member 120c on one side 10a of the battery cell 110. By this principle, multiple battery cells 110 can be connected in series.

[0070] In one embodiment, the at least one cooling groove 132 may include a plurality of cooling grooves 132. The plurality of cooling grooves 132 can face the first outermost busbar member 120a and the second outermost busbar member 120b, respectively. Here, "facing" means that in the cross-section (YZ plane) in the thickness direction of the busbar frame 120, no other components are arranged between the cooling groove 132 and the first outermost busbar member 120a, or between the cooling groove 132 and the second outermost busbar member 120b, and at least one surface of the cooling groove 132 and the first outermost busbar member 120a directly faces each other. Alternatively, it means that at least one surface of the cooling groove 132 and the second outermost busbar member 120b directly faces each other.

[0071] In such cases, the multiple cooling grooves 132 may be provided on the support surface 131 of the busbar frame 130 that supports the first outermost busbar member 120a and the second outermost busbar member 120b. The multiple cooling grooves 132 can be spaced apart from each other in the stacking direction (X direction) of the battery cells 110.

[0072] According to this, the first outermost busbar member 120a and the second outermost busbar member 120b can be easily cooled. Therefore, the busbar member 120 can be cooled in areas where heat generation is relatively intense.

[0073] The cooling groove 132 can have a certain volume. The area opened by the cooling groove 132 can face the first outermost busbar member 120a and the second outermost busbar member 120b. Air can flow through the cooling groove 132. This allows the first outermost busbar member 120a and the second outermost busbar member 120b to be air-cooled.

[0074] Figure 3 schematically shows a cross-section along the line II-II' in Figure 2. In Figure 3, the battery cell 110 and electrode lead 111 are not shown in cross-section.

[0075] As shown in Figures 1 to 3, in one embodiment of the present disclosure, a plurality of battery cells 110 may include an outer casing 112 that houses an electrode assembly and a plurality of electrode leads 111 connected to the electrode assembly and extended to the outside of the outer casing 112. Here, the support surface 131 of the busbar frame 130 and the at least one cooling groove 132 do not have to face the outer casing 112.

[0076] The outer casing 112 may house an electrode assembly inside, and the area of ​​the outer casing 112 in which the electrode assembly is housed may be an electrode assembly housing space 113. The electrode assembly housing space can be sealed by sealing the outer casing 112. The outer casing 112 can be sealed in the area from which the electrode leads 111 are drawn out and in the side sealing portion 116.

[0077] Areas where there are no areas sealed by the exterior material 112, and where the exterior material 112 is folded or includes the folding line of the exterior material 112, can be the bottom surface 117 of the exterior material 112. The bottom surface of the exterior material 112 can face the side sealing portion 116 in the height direction (Z direction) of the battery cell 110.

[0078] Although Figure 3 shows only one electrode lead 111 of a single battery cell 110, a single battery cell 110 may have a structure that is symmetrical to the structure shown in Figure 3.

[0079] The busbar frame 130 may include a support surface 131 that does not face the exterior material 112, and an inner surface 131a that faces the support surface 131 and faces the exterior material 112. The inner surface 131a does not have to face the busbar member 120. The cooling groove 132 may have a certain depth in the thickness direction of the busbar frame 130. The cooling groove 132 does not have to be connected to the inner surface 131a. This makes it possible to cool the busbar member 120 while preventing a decrease in the rigidity or strength of the busbar frame 130.

[0080] For example, the support surface 131 of the busbar frame 130 and the at least one cooling groove 132 do not have to directly face the exterior material 112 or the electrode assembly housing space 113, which is the space in the exterior material 112 where the electrode assembly is housed, in the Y-direction in the cross-section (YZ plane) of the busbar frame 130. In this case, the inner surface 131a of the busbar frame 130 can be located between the support surface 131 of the busbar frame 130 and the electrode assembly housing space 113, and between the at least one cooling groove 132 and the electrode assembly housing space 113.

[0081] Furthermore, in the cross-section (YZ plane) in the thickness direction of the busbar frame 130, the support surface 131 and the inner surface 131a of the busbar frame 130 may be opposing surfaces. In this case, the space between the support surface 131 and the inner surface 131a of the busbar frame 130 may be filled with the material constituting the busbar frame 130.

[0082] The cooling groove 132 may be formed by partially removing material from the busbar frame 130 in the thickness direction cross-section (YZ plane) of the busbar frame 130. For example, the cooling groove 132 may be formed by at least a portion of the support surface 131 of the busbar frame 130 being recessed toward the electrode assembly housing space 113. The cooling groove 132 may contain a certain volume, and a fluid such as air may be present in the cooling groove 132. Alternatively, the cooling groove 132 may be filled with a material for thermal insulation.

[0083] Furthermore, the first outermost busbar member 120a can extend with its end bent. The end of the first outermost busbar member 120a can extend away from the exterior material 112. The second outermost busbar member 120b can also have the same shape as the first outermost busbar member 120a.

[0084] The first outermost busbar member 120a and the second outermost busbar member 120b may be used to electrically connect multiple battery devices 100 to each other. The first outermost busbar member 120a and the second outermost busbar member 120b may have different electrical polarities and may be connected to other first outermost busbar members 120a and second outermost busbar members 120b of even more adjacent battery devices 100. This facilitates the expansion or modularization of multiple battery devices 100. However, the shapes of the first outermost busbar member 120a, the second outermost busbar member 120b, and the connecting busbar member 120c are not necessarily limited by this disclosure.

[0085] The busbar frame 130 may include a second slot 134 through which the electrode lead 111 passes. The second slot 134 may face a first slot 121 formed in the busbar member 120. The electrode lead 111 may pass through the second slot 134 and the first slot 121 and be bent on the outer surface of the busbar member 120 in the -Y direction. The end of the electrode lead 111 may be in contact with the busbar member 120.

[0086] In one embodiment, at least one cooling groove 132 may be positioned above the plurality of electrode leads 111 in the height direction of the battery cell 110 in the width direction cross-section of the battery cell 110.

[0087] In the cross-section of the battery cell 110 in the width direction (YZ plane), the first height H1, which is the height of the cooling groove 132, may be higher than the second height H2, which is the height of the electrode lead 111. The first height H1 and the second height H2 may be the height from the bottom surface 117 of the battery cell 110. The first height H1 may be the height from the bottom surface 117 to the lowest point of the cooling groove 132 in the -Z direction in the cross-section of the battery cell 110 in the width direction.

[0088] The second height H2 may be the height from the bottom surface 117 to the highest point of the electrode lead 111 in the +Z direction in the widthwise cross-section of the battery cell 110.

[0089] Furthermore, as an example, the second height H2 can exceed the height of the first slot 121 in the Z-axis direction and the height of the second slot 134 in the Z-axis direction. This allows for the provision of a cooling groove 132 without interfering with the electrode lead 111.

[0090] Figure 4 schematically shows a busbar frame 130, a busbar member 120, and an electrode lead 111 according to one embodiment of the present disclosure.

[0091] As shown in Figures 3 and 4, the first outermost busbar member 120a and the second outermost busbar member 120b may include a region where the width in the thickness direction (X direction) of the battery cell 110 is narrower than the width in the thickness direction (X direction) of the connecting busbar member 120c. The narrower region in the first outermost busbar member 120a and the second outermost busbar member 120b can generate relatively more heat compared to the wider region.

[0092] Therefore, by having at least a portion of the cooling groove 132 located in the narrower region of the first outermost busbar member 120a and the second outermost busbar member 120b, the cooling efficiency of the first outermost busbar member 120a and the second outermost busbar member 120b can be increased.

[0093] In one embodiment, at least one cooling groove 132 may have a polygonal outline OL in the cross-section (XZ plane) in the thickness direction of the battery cell 110.

[0094] As an example, at least one cooling groove 132 may have a rectangular outline OL in the cross-section (XZ plane) in the thickness direction of the battery cell 110. This allows for maximizing the area of ​​the cooling groove 132 within the same area.

[0095] In one embodiment, the cooling grooves 132 may be provided in multiple quantities, and the multiple cooling grooves 132 may be provided on the first outermost busbar member 120a and the second outermost busbar member 120b, respectively. In some cases, the first outermost busbar member 120a may be provided with multiple cooling grooves 132, and the second outermost busbar member 120b may be provided with multiple cooling grooves 132.

[0096] Figure 5 schematically shows a cross-section along line II-II' of a battery device 100 according to yet another embodiment of the present disclosure. Line II-II' is shown in Figure 2. However, the battery device 100 shown in Figure 5 may be a different embodiment from the battery device 100 shown in Figure 2. Also, in Figure 5, the battery cell 110 and electrode lead 111 are not shown in cross-section.

[0097] As shown in Figure 5, a battery device 100 according to yet another embodiment of the present disclosure may further include an insulating member 140 disposed in at least one cooling groove 132. The insulating member 140 can help prevent thermal damage to the busbar frame 130 due to heat generated by the busbar member 120.

[0098] The thermal insulation member 140 may include materials with relatively low thermal conductivity. For example, the thermal insulation member 140 may include polystyrene foam (EPS / XPS), polyurethane foam (PUR), fiberglass, or aerogel. This makes it possible to prevent thermal damage to the busbar frame 130 while minimizing the increase in the weight of the battery device 100.

[0099] In some cases, the thermal insulation member 140 may be inserted into the cooling groove 132 and fixed or bonded to the busbar frame 130. However, this is not necessarily limited by the present disclosure.

[0100] Figure 6 schematically shows a busbar frame 130, busbar member 120, and electrode lead 111 according to yet another embodiment of the present disclosure.

[0101] As shown in Figure 6, in yet another embodiment of the present disclosure, at least one cooling groove 132 may have an outline OL that includes a curve in the cross-section (XZ plane) in the thickness direction of the battery cell 110.

[0102] For example, the outline OL of at least one cooling groove 132 may be circular. Also, for example, the shapes of multiple cooling grooves 132 may be the same or different from each other. For instance, the outline OL of a cooling groove 132 facing the first outermost busbar member 120a may be circular, while the outline OL of a cooling groove 132 facing the second outermost busbar member 120b may be polygonal.

[0103] Therefore, the shape of the outer contour line OL of the cooling groove 132 can be appropriately applied, taking into consideration the amount of heat generated by the busbar member 120, the specifications of the battery device 100, and so on.

[0104] Figure 7 schematically shows a busbar frame 130, busbar member 120, and electrode lead 111 according to yet another embodiment of the present disclosure.

[0105] As shown in Figure 7, in yet another embodiment of the present disclosure, the busbar frame 130 may further include at least one exhaust groove 133 connected to at least one cooling groove 132 and extending toward a region not facing the busbar member 120. For example, the at least one exhaust groove 133 may include a region located in the XZ plane between the edge of the busbar member 120 and the edge of the busbar frame 130. Alternatively, for example, the at least one exhaust groove 133 may extend toward the edge of the busbar frame 130. The exhaust groove 133 can connect the edge of the busbar frame 130 to the cooling groove 132.

[0106] In one embodiment, at least one exhaust groove 133 can include multiple exhaust grooves 133. For example, one of the multiple exhaust grooves 133 can connect one edge of the cooling groove 132 to one edge of the busbar frame 130. Another exhaust groove 133 can connect the other edge of the cooling groove 132 to the other edge of the busbar frame 130. For example, multiple exhaust grooves 133 can be connected to a cooling groove 132 facing a first outermost busbar member 120a. Multiple exhaust grooves 133 can also be connected to a cooling groove 132 facing a second outermost busbar member 120b.

[0107] The exhaust channel 133 can serve as a passage through which air that has exchanged heat with the busbar member 120 in the cooling channel 132 can escape to the outside of the busbar member 120 and the busbar frame 130. Conversely, the exhaust channel 133 can also serve as a passage through which relatively cooler air can flow into the exhaust channel 133. This can increase the cooling efficiency of the battery device 100.

[0108] In one embodiment, the at least one exhaust groove 133 may include a first exhaust groove 133a connected to one side of the at least one cooling groove 132 and extending in a direction parallel to the thickness direction of the battery cell 110, and a second exhaust groove 133b connected to the other side of the at least one cooling groove 132 and extending in a direction intersecting the first exhaust groove 133a.

[0109] For example, the first exhaust groove 133a and the second exhaust groove 133b can be connected to the cooling groove 132 facing the first outermost busbar member 120a, and the first exhaust groove 133a and the second exhaust groove 133b can be connected to the cooling groove 132 facing the second outermost busbar member 120b.

[0110] Depending on the circumstances, at least one of the first exhaust grooves 133a and the second exhaust grooves 133b connected to the cooling groove 132 facing the first outermost busbar member 120a may be provided in multiples. Similarly, at least one of the first exhaust grooves 133a and the second exhaust grooves 133b connected to the cooling groove 132 facing the second outermost busbar member 120b may also be provided in multiples. This allows for the construction of diverse air venting paths.

[0111] In one embodiment, at least one of the first exhaust groove 133a and the second exhaust groove 133b may extend to the edge E of the busbar frame 130.

[0112] For example, the first exhaust groove 133a may extend parallel to the thickness direction (X direction) of the battery cell 110, or it may extend toward the second edge E2 of the busbar frame 130. One side of the first exhaust groove 133a may be connected to the cooling groove 132, and the other side may overlap with the second edge E2.

[0113] As an example, the second exhaust groove 133b may be formed intersecting or perpendicular to the first exhaust groove 133a. The second exhaust groove 133b may extend parallel to the height direction (Z direction) of the battery cell 110 and may extend toward the first edge E1 of the busbar frame 130. One side of the second exhaust groove 133b may be connected to the cooling groove 132, and the other side may overlap with the first edge E1.

[0114] According to this, the air that has completed heat exchange with the busbar member 120 can be discharged to the outside of the busbar frame 130. Therefore, the cooling performance of the battery device 100 can be improved. The improvement in the cooling performance of the battery device 100 can contribute to the improvement of the electrical stability and safety of use of the battery device 100.

[0115] Furthermore, in one embodiment, in the height direction (Z direction) of the battery cell 110, the heights of the first outermost busbar member 120a and the second outermost busbar member 120b may be higher than the height of at least one of the plurality of connecting busbar members 120c.

[0116] Here, at least one cooling groove 132 may include a region that exceeds the height of the at least one connecting busbar member 120c in the height direction (Z direction) of the battery cell 110. For example, at least one cooling groove 132 may include a region having a height that exceeds the height of the connecting busbar member 120c in the height direction (Z direction) of the battery cell 110. This allows the cooling groove 132 to be placed in regions with relatively high heat generation in the first outermost busbar member 120a and the second outermost busbar member 120b.

[0117] In one embodiment, the bent regions of the first outermost busbar member 120a and the second outermost busbar member 120b may be located in a region that exceeds the height of the connecting busbar member 120c in the Z-axis direction. In such a case, at least a portion of the cooling groove 132 can be located in the bent regions of the first outermost busbar member 120a and the second outermost busbar member 120b.

[0118] Figure 8 schematically shows a busbar frame 130, busbar member 120, and electrode lead 111 according to yet another embodiment of the present disclosure.

[0119] As shown in Figure 8, in yet another embodiment of the present disclosure, at least one cooling groove 132 includes a plurality of cooling grooves 132, and the plurality of cooling grooves 132 can face the plurality of connecting busbar members 120c. For example, one cooling groove 132 can face one connecting busbar member 120c. The number of cooling grooves 132 and the number of connecting busbar members 120c may be the same.

[0120] At least one of the multiple cooling grooves 132 may be a cooling groove 150 of a connecting busbar member facing the connecting busbar member 120c. In one embodiment, there may be multiple cooling grooves 150 of the connecting busbar member. Also, one cooling groove 150 of a connecting busbar member can face one connecting busbar member 120c. This allows for cooling of the connecting busbar member 120c as well.

[0121] As an example, the cooling groove 150 of a connecting busbar member facing one connecting busbar member 120c can be interposed between a pair of electrode leads 111. That is, the cooling groove 150 of the connecting busbar member can face the region located between the pair of electrode leads 111 in the connecting busbar member 120c. This allows for cooling of a region in the connecting busbar member 120c that generates a relatively large amount of heat.

[0122] As an example, the cooling groove 150 of the connecting busbar member can face the centroid of the connecting busbar member 120c. This region can be a region in the connecting busbar member 120c that generates a relatively large amount of heat, thereby effectively cooling the connecting busbar member 120c. Therefore, it is possible to prevent the busbar frame 130 from being damaged by the region of the connecting busbar member 120c that generates a large amount of heat.

[0123] Figure 9 is a schematic exploded perspective view of a battery device 100 according to yet another embodiment of the present disclosure. As shown in Figure 9, in one embodiment of the present disclosure, the busbar frame 130 may include a notch 160 into which a busbar member 120 can be inserted. In the XZ plane, the outline of the notch 160 may correspond to the outline of the busbar member 120. In such a case, the cooling groove 132 may be located in the notch 160.

[0124] The busbar member 120 may include a first busbar member 222a connected to the outermost battery cell 110 on one side of the plurality of battery cells 110, a second busbar member 222b connected to the outermost battery cell 110 on the other side, and a plurality of third busbar members 221 connected to a plurality of battery cells 110 interposed between the plurality of outermost battery cells 110.

[0125] In such a case, the notches 160 may be provided in the areas of the busbar frame 130 that face the first busbar member 222a, the second busbar member 222b, and the third busbar member 221, respectively. Here, there may be multiple cooling grooves 132, with one cooling groove 132 facing the first busbar member 222a and another cooling groove 132 facing the second busbar member 222b.

[0126] The busbar frame 130 can be positioned on one side 10a and the other side 10b of a plurality of battery cells 110, respectively. The busbar frame 130 located on one side 10a of the battery cell 110 can have a first busbar member 222a, a second busbar member 222b, and a third busbar member 221 fixed to it, and the busbar frame 130 located on the other side 10b of the battery cell 110 can have a third busbar member 221 fixed to it. In this case, the busbar frame 130 located on the other side 10b of the battery cell 110 can be provided with a notch 160 having a shape corresponding to the third busbar member 221.

[0127] In one embodiment, the battery device 100 may further include a sensing unit 190. The sensing unit 190 may include a first substrate 191 connected to a busbar member 120 located on one side 10a of the battery cell 110, a second substrate 192 connected to a busbar member 120 located on the other side 10b of the battery cell 110, and a connecting substrate 193 connecting the first substrate 191 and the second substrate 192.

[0128] The first board 191 and the second board 192 may be printed circuit boards (PCBs). The first board 191 and the second board 192 may each include a plurality of connecting terminals 194. The plurality of connecting terminals 194 may be connected to the busbar member 120. This allows for sensing the voltage information of the battery cell 110.

[0129] The connecting board 193 may be a flexible printed circuit board (FPCB).

[0130] In one embodiment, the multiple battery cells 110, sensing unit 190, busbar frame 130, and busbar member 120 may be housed in a case 170 including a housing unit 171. The case 170 can be made of a material having a certain level of rigidity or higher.

[0131] A cover member 180 may be provided on the upper part of the case 170 in the height direction (Z direction) of the battery cells 110. The cover member 180 can cover multiple battery cells 110, a sensing unit 190, a busbar frame 130, and busbar members 120. The cover member 180 can be fixed to the upper part of the case 170.

[0132] On the other hand, in another aspect of this disclosure, a method for manufacturing a battery device 100 is provided to manufacture a battery device including a plurality of battery cells 110 each containing a plurality of electrode leads 111, busbar members 120 connected to the plurality of electrode leads 111, and a busbar frame 130 supporting the busbar members 120. Figure 10 schematically shows a method for manufacturing a battery device 100 according to one embodiment of this disclosure. The busbar members 120 may be provided in a plurality. The plurality of busbar members 120 can be connected to the plurality of electrode leads 111.

[0133] As shown in Figures 2 and 10, a method for manufacturing a battery device 100 according to one embodiment of the present disclosure may include a preparation step (S110) of preparing a busbar frame 130 having at least one cooling groove 132 formed on a support surface 131 that supports the busbar member 120 for cooling the busbar member 120, and an electrode lead connecting step (S120) of connecting the electrode leads 111 of the battery cell 110 to the busbar member 120.

[0134] The cooling grooves 132 can be formed in the busbar frame 130 by laser processing or the like. However, the method for forming the cooling grooves 132 is not necessarily limited by this disclosure.

[0135] Furthermore, the busbar frame 130 may have multiple cooling grooves 132 formed therein.

[0136] Furthermore, in the busbar frame 130, cooling grooves 132 can be formed in the region where the busbar frame 130 faces the first outermost busbar member 120a and the second outermost busbar member 120b. This allows the busbar member 120 to be cooled in the region where the heat generation of the busbar member 120 is high, thereby preventing damage to the busbar frame 130.

[0137] In the electrode lead connection stage (S120), the electrode lead 111 can be bent after passing through the busbar frame 130 and the busbar member 120 and being pulled out to the outside of the busbar member 120. In the electrode lead connection stage (S120), the electrode lead 111 can be welded to the busbar member 120.

[0138] In the electrode lead connection step (S120), multiple electrode leads 111 can be connected to multiple busbar members 120.

[0139] The above-described examples are merely illustrative of the application of the principles of this disclosure, and other configurations may be included or substituted without departing from the scope of this disclosure. Furthermore, the above-described embodiments may be applied individually or in combination. [Explanation of symbols]

[0140] 110 Battery cell 120 Busbar component 130 Busbar frame 131 Support surface 132 Cooling groove 133 Exhaust groove 140 Insulation member 150 Cooling groove for connecting busbar member 160 notches 170 cases 180 Cover component 190 Sensing unit

Claims

1. Multiple battery cells, each containing multiple electrode leads, A busbar member connected to the plurality of electrode leads, The busbar frame includes the busbar member that supports the busbar member, The aforementioned busbar frame is Including a support surface facing the busbar member, The aforementioned support surface is A battery device including at least one cooling groove.

2. The aforementioned plurality of battery cells are An outer material that houses the electrode assembly, The electrode assembly includes the plurality of electrode leads connected to the electrode assembly and extended to the outside of the outer casing, The support surface and the at least one cooling groove are The battery device according to claim 1, wherein it does not face the exterior material.

3. The at least one cooling groove is The battery device according to claim 1 or 2, wherein in the cross-section in the width direction of the battery cell, the battery cell is positioned above the plurality of electrode leads in the height direction of the battery cell.

4. The battery device according to any one of claims 1 to 3, further comprising a heat insulating member disposed in the at least one cooling groove.

5. The at least one cooling groove is The battery device according to any one of claims 1 to 4, wherein the outer shape of the cross-section in the thickness direction of the battery cell is polygonal.

6. The at least one cooling groove is The battery device according to any one of claims 1 to 5, wherein the outline of the battery cell in the cross-section in the thickness direction includes a curve.

7. The aforementioned busbar frame is The battery device according to any one of claims 1 to 6, further comprising at least one exhaust groove connected to the at least one cooling groove and extending toward a region not facing the busbar member.

8. The aforementioned at least one exhaust port is A first exhaust groove is connected to one side of the at least one cooling groove and extends in a direction parallel to the thickness direction of the battery cell, The battery device according to claim 7, further comprising: a second exhaust groove connected to the other side of the at least one cooling groove and extending in a direction intersecting the first exhaust groove.

9. At least one of the first exhaust groove and the second exhaust groove is The battery device according to claim 8, extending to the edge of the busbar frame.

10. The aforementioned busbar member is A plurality of connecting busbar members are arranged on one side and the other side of the battery cell, connecting pairs of adjacent electrode leads, A first outermost busbar member is arranged on one or the other side of the battery cell and is connected to the first outermost battery cell, which is located on the outermost side of the plurality of battery cells. A battery device according to any one of claims 1 to 9, comprising: a second outermost busbar member disposed on one or the other side of the battery cell and connected to a second outermost battery cell disposed on the outermost side of the plurality of battery cells.

11. The at least one cooling groove is Includes multiple cooling grooves, The aforementioned multiple cooling grooves are The battery device according to claim 10, facing the first outermost busbar member and the second outermost busbar member.

12. The battery device according to claim 11, wherein in the height direction of the battery cell, the heights of the first outermost busbar member and the second outermost busbar member are greater than the height of at least one of the plurality of connecting busbar members.

13. The at least one cooling groove is The battery device according to claim 12, wherein the height of the battery cell includes a region that exceeds the height of the at least one connecting busbar member.

14. The at least one cooling groove is Includes multiple cooling grooves, The aforementioned multiple cooling grooves are The battery device according to claim 10, which faces the plurality of connecting busbar members.

15. To manufacture a battery device including a plurality of battery cells each containing a plurality of electrode leads, a busbar member connected to the plurality of electrode leads, and a busbar frame supporting the busbar member, A preparation step of preparing the busbar frame having at least one cooling groove formed on the support surface that supports the busbar member, A method for manufacturing a battery device, comprising the step of connecting the plurality of electrode leads to the busbar member.

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