Battery pack having cell edge cooling structure and device including same

Abstract

A battery pack according to an embodiment of the present invention includes: a cell module assembly including a battery cell stack including a plurality of stacked battery cells, and a bus bar frame covering both side surfaces of the battery cell stack; and a pack frame in which the cell module assembly is seated, wherein a gap is formed between the pack frame and the upper end of the cell module assembly and between the pack frame and the lower end of the cell module assembly, and air is introduced into the gap through holes formed in the bus bar frame to cool the edge portion of the battery cells.

Description

Battery pack having cell edge cooling structure and device including same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0084584, filed June 27, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack having a cell edge cooling structure, and more specifically, to a battery pack having a cooling path formed through upper and lower spaces of a battery cell stack to implement a cell edge cooling structure, and a device including the same.

[0004] Secondary batteries are attracting attention as a power source for electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, which are being proposed as a solution to solve air pollution problems caused by conventional vehicles using fossil fuels, diesel vehicles, etc.

[0005] While small mobile devices use one or two or three battery cells per device, medium- to large-sized devices such as automobiles use medium- to large-sized battery modules that electrically connect multiple battery cells due to the need for high output and large capacity.

[0006] Since mid- to large-sized battery modules are preferably manufactured with the smallest possible size and weight, square batteries and pouch-type batteries, which can be stacked with high integration and have a small weight-to-capacity ratio, are primarily used as battery cells in mid- to large-sized battery modules. In particular, pouch-type batteries, which use aluminum laminate sheets as external components, have recently attracted considerable attention due to their advantages such as light weight, low manufacturing costs, and ease of shape modification.

[0007] The battery cells that make up these medium- to large-sized battery modules are composed of rechargeable secondary batteries. Therefore, these high-output, high-capacity secondary batteries generate a large amount of heat during the charging and discharging process. In particular, pouch-type secondary batteries, widely used in battery modules, generate heat during repeated charging and discharging. Because these pouch-type secondary batteries are densely packed in a battery module, the temperature of the battery module can rise significantly during operation. If the battery module temperature exceeds the appropriate level, its performance may deteriorate, and in severe cases, there is a risk of explosion or fire. Therefore, securing a cooling method is crucial when constructing a battery module.

[0008] Generally, water cooling and air cooling can be used for cooling systems, but air cooling tends to be widely used due to issues such as leakage current and waterproofing of secondary batteries.

[0009] Many conventional air-cooled battery modules are designed to have a structure in which a gap is provided between battery cells that are stacked in one direction to secure a flow path and allow air to pass through the flow path. For example, Korean Patent Publication No. 10-2013-0035192 discloses a technology for cooling battery cells by providing a gap between unit cells to allow air to flow between the unit cells, and Korean Patent Publication No. 10-2014-0144781 discloses a technology for indirectly cooling battery cells by cooling fins cooled by air by contacting two cooling fins between battery cells and providing a flow path between the two cooling fins to allow air to flow.

[0010] However, conventional air-cooled battery modules, such as those described above, may have low energy densities per unit volume due to the gaps between unit cells required to secure airflow. Furthermore, when subjected to shock or vibration, the unit cells may come into close contact, eliminating the airflow path, or foreign substances may enter the narrow airflow path, potentially blocking it, resulting in poor structural stability. Furthermore, maintaining a consistent gap between unit cells requires additional components, such as cartridges, necessitating additional cartridge assembly processes and increasing costs.

[0011] The problem to be solved by the present invention is to provide a battery pack and device that implements a cell edge cooling structure by forming a cooling path through the upper and lower spaces of a battery cell stack without an additional structure between adjacent battery cells.

[0012] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0013] A battery pack according to one embodiment of the present invention includes a battery cell stack including a plurality of stacked battery cells, a cell module assembly including a bus bar frame covering each of both sides of the battery cell stack, and a pack frame on which the cell module assembly is mounted, wherein a gap is formed between the pack frame and the upper end of the cell module assembly and between the pack frame and the lower end of the cell module assembly, and air is introduced into the gap through a hole formed in the bus bar frame to cool an edge portion of the battery cell.

[0014] The battery pack further includes cover assemblies that are spaced apart from each other in the stacking direction of the battery cells and cover both sides of the cell module assembly, and each of the cover assemblies may be formed with an inlet through which external air is introduced and an outlet through which air passing through the cell module assembly is discharged.

[0015] Air introduced through the inlet flows along one side of the cell module assembly, and the air is introduced into the gap through a hole formed in the busbar frame, and the air passing through the gap can be discharged through the outlet.

[0016] The above inlet and the above outlet may be arranged diagonally to each other when viewed on a plane.

[0017] A first air channel formed in a straight line with the direction in which the inlet is formed, a second air channel formed between the pack frame and the cell module assembly, and a third air channel formed in a straight line with the direction in which the outlet is formed, wherein the first air channel and the third air channel are formed in the same direction as the stacking direction of the battery cells, and the second air channel can be formed in a direction perpendicular to the stacking direction of the battery cells.

[0018] The above second air path can correspond to the gap into which air flows in through a hole formed in the busbar frame.

[0019] The first side of the battery cell stack on which the cover assembly is formed and the second side of the battery cell stack on which the bus bar frame is formed can intersect each other.

[0020] The battery pack may further include a cover plate positioned between the cover assembly and the first side of the battery cell stack.

[0021] Air introduced through the hole formed in the above bus bar frame can directly contact the electrode leads protruding from the battery cell and cool the electrode leads.

[0022] The electrode lead portion that meets the air introduced through the hole may be located in the space between the bus bar frame and the battery cell stack.

[0023] The above hole includes a middle hole formed in the middle portion of the bus bar frame and a lower hole formed in the lower portion of the bus bar frame, and air introduced through the middle hole can directly contact the electrode lead.

[0024] The battery pack may further include an insulating plate positioned between the bottom portion of the pack frame and the cell module assembly.

[0025] The pack frame includes a bottom frame facing the lower portion of the cell module assembly, an upper frame covering the upper portion of the cell module assembly, and side frames surrounding the left and right sides of the cell module assembly, wherein the side frames can surround the bus bar frame.

[0026] The upper part of the bus bar frame and the upper frame of the pack frame are spaced apart, and the lower part of the bus bar frame and the bottom frame of the pack frame can be in direct contact.

[0027] A device according to another embodiment of the present invention comprises at least one battery pack as described above.

[0028] According to embodiments, the cooling flow rate can be increased by allowing air to flow in through holes formed in the bus bar housing, thereby cooling not only the cell terrace but also the cell lead.

[0029] Additionally, according to embodiments, a space may be formed between the bus bar housing and the pack frame, allowing air to move through the space to cool the cell edges.

[0030] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0031] FIG. 1 is an exploded perspective view illustrating a battery pack according to one embodiment of the present invention.

[0032] Figure 2 is a perspective view showing how air moves in the battery pack of Figure 1.

[0033] FIG. 3 is a perspective view of a battery cell included in the battery pack of FIG. 1.

[0034] FIG. 4 is a perspective view showing a cell module assembly according to one embodiment of the present invention.

[0035] Fig. 5 is a front view showing the bus bar frame viewed in the -x-axis direction of Fig. 1.

[0036] Fig. 6 is a cross-sectional view showing the movement of air along the zx plane of Fig. 1.

[0037] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be implemented in various different forms other than those described below, and the scope of the present invention is not limited by the embodiments described herein.

[0038] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0039] In addition, the size and thickness of each component shown in the drawings are arbitrarily enlarged or reduced for convenience of explanation, so it is obvious that the content of the present invention is not limited to what is shown. In the drawings below, the thickness of each layer is enlarged to clearly express various layers and regions. In addition, in the drawings below, the thickness of some layers and regions is exaggerated for convenience of explanation.

[0040] Also, when a part such as a layer, membrane, region, or plate is described as being "over" or "on" another part, this should be interpreted to include not only cases where the layer, membrane, region, or plate is "directly over" the other part, but also cases where there are other parts in between. Conversely, when a part such as a layer, membrane, region, or plate is described as being "directly over" another part, this can mean that there are no other parts in between. Furthermore, being "over" or "on" a reference part means being located above or below the reference part, and may not necessarily mean being located "over" or "on" the opposite direction of gravity. Meanwhile, just as describing being "over" or "on" another part, describing being "under" or "beneath" another part can also be understood with reference to the above.

[0041] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0042] Additionally, throughout the specification, when we say "in plan", we mean when the part is viewed from above, and when we say "in cross section", we mean when the part is viewed from the side in a cross-section cut vertically.

[0043] FIG. 1 is an exploded perspective view illustrating a battery pack according to one embodiment of the present invention. FIG. 2 is a perspective view illustrating air movement in the battery pack of FIG. 1. FIG. 3 is a perspective view illustrating a battery cell included in the battery pack of FIG. 1. FIG. 4 is a perspective view illustrating a cell module assembly according to one embodiment of the present invention.

[0044]

[0045] Referring to FIGS. 1 to 4, a cell module assembly (100) according to one embodiment of the present invention includes a battery cell stack (120) in which a plurality of battery cells (110) including electrode leads (111, 112) protruding in opposite directions are stacked, a holding band (125) for fixing the battery cell stack (120), and a bus bar frame (150) arranged on one surface of the battery cell stack (120) in one direction (x-axis direction) in which the electrode leads (111) protrude.

[0046] First, referring to FIG. 3, it is preferable that the battery cell (110) be a pouch-type battery cell. For example, the battery cell (110) according to the present embodiment has a structure in which two electrode leads (111, 112) face each other and protrude from one end (114a) and the other end (114b) of the cell body (113), respectively. More specifically, the electrode leads (111, 112) are connected to an electrode assembly (not shown) and protrude from the electrode assembly (not shown) to the outside of the battery cell (110).

[0047] Meanwhile, the battery cell (110) can be manufactured by bonding the two ends (114a, 114b) of the cell case (114) and one side (114c) connecting them while housing the electrode assembly (not shown) in the cell case (114). In other words, the battery cell (110) according to the present embodiment has a total of three sealing portions (114sa, 114sb, 114sc), and the sealing portions (114sa, 114sb, 114sc) have a structure in which they are sealed by a method such as heat fusion, and the remaining other side can be formed as a connecting portion (115). The cell case (114) can be formed of a laminate sheet including a resin layer and a metal layer.

[0048] In addition, the connecting portion (115) may be extended along one edge of the battery cell (110), and a protrusion (110p) of the battery cell (110), called a bat-ear, may be formed at the end of the connecting portion (115). In addition, as the cell case (114) is sealed with the protruding electrode leads (111, 112) interposed therebetween, a terrace portion (116) may be formed between the electrode leads (111, 112) and the cell body (113). That is, the battery cell (110) includes a terrace portion (116) that extends from the cell case (114) in the direction in which the electrode leads (111, 112) protrude.

[0049] According to the present embodiment, the upper and lower portions of the battery cell (110) may correspond to a side portion (114c) and a connection portion (115) connecting the two ends (114a, 114b) of the cell case (114), respectively. The upper and lower portions of the battery cell (110) may be cell edge-cooled portions, which will be described later.

[0050] The battery cell (110) may be configured in multiple units, and the multiple battery cells (110) may be stacked so as to be electrically connected to each other to form a battery cell stack (120). Referring to FIGS. 3 and 4, the battery cells (110) may be stacked along the y-axis direction to form a battery cell stack (120). A bus bar frame (150) may be positioned on one surface of the battery cell stack (120) in the direction in which the electrode leads (111) protrude (x-axis direction). Although not specifically illustrated, a bus bar frame may also be positioned on the other surface of the battery cell stack (120) in the direction in which the electrode leads (112) protrude (-x-axis direction). A battery cell stack (120) and a bus bar frame (150) form a cell module assembly (100), and the movement of battery cells (110) included in the battery cell stack (120) can be prevented by a holding band (125). The cell module assembly (100) according to the present embodiment can form a structure in which the module frame and the end plate are removed. Instead of the module frame, the cell module assembly (100) according to the present embodiment can include a cover plate (300) and a holding band (125).

[0051] As the module frame and end plates are removed, complex processes requiring precise control, such as the process of accommodating the battery cell stack (120) inside the module frame or the process of assembling the module frame and the end plates, are unnecessary. In addition, the weight of the cell module assembly (100) can be significantly reduced by the amount of the removed module frame and end plates. In addition, the cell module assembly (100) according to the present embodiment has the advantage of being advantageous in terms of reworkability during the battery pack assembly process due to the removal of the module frame, which can be compared to the conventional method in which rework is impossible even if a defect occurs due to the welding structure of the module frame.

[0052] The cover plate (300) is a plate-shaped member and is positioned on both sides of the battery cell stack (120) to supplement the rigidity of the cell module assembly (100). This cover plate (300) has elastic properties and may include a plastic material manufactured by injection molding, and in some cases, a plate spring material may be applied.

[0053] The holding band (125) is a member that wraps around the battery cell stack (120) at both ends of the battery cell stack (120), and can serve the function of fixing a plurality of battery cells (110) constituting the battery cell stack (120) and the cover plate (300). Specifically, a groove is formed on one surface of the cover plate (300), and after the end of the holding band (125) is seated in the groove, the end of the holding band (125) and the cover plate (300) can be coupled through a fixing member (not shown). Two pairs of holding bands (125) can be directly applied to one cell module assembly (100), and one pair of holding bands (125) can wrap around the upper part of the cell module assembly (100) (a surface facing the cell module assembly in the -z-axis in FIG. 4), and the other pair of holding bands (125) can wrap around the lower part of the cell module assembly (100) (a surface facing the cell module assembly in the z-axis direction in FIG. 4).

[0054] This holding band (125) may be made of a material having a predetermined elasticity, and specifically, a plate spring structure may be applied. The holding band (125) may be formed of a metal strap.

[0055] In this way, after fixing the battery cell stack (120) and the cover plate (300) through the holding band (125), the bus bar frame (150) can be positioned on the front and rear sides of the battery cell stack (120) corresponding to the direction in which the electrode leads (111) protrude. A groove for fastening a fixing member (155) can be formed at the end of the cover plate (300) overlapping the bus bar frame (150), and the bus bar frame (150) and the cover plate (300) can be coupled through the fixing member (155) to form a cell module assembly (100).

[0056] Referring to FIG. 1, a battery pack according to the present embodiment includes a battery cell stack (120) including a plurality of battery cells (110), a cell module assembly (100) including a bus bar frame (150) covering both sides of the battery cell stack (120), a pack frame (350) on which the cell module assembly (100) is mounted, a cover plate (300) positioned on both sides of the battery cell stack (120) in the stacking direction of the battery cells (110), and a cover assembly (200) covering the cover plate (300). A terminal cover portion (220) covering a terminal portion (not shown) may be coupled to the cover assembly (200).

[0057] The pack frame (350) may include a bottom frame (400), an upper frame (500), and a side frame (570). The bottom frame (400) faces the lower portion of the cell module assembly (100), the upper frame (500) covers the upper portion of the cell module assembly (100), and the side frame (570) may surround the left and right sides of the cell module assembly (100). The side frame (570) according to the present embodiment may be arranged to face the bus bar frame (150).

[0058] According to this embodiment, the upper frame (500) and the side frame (570) can be formed integrally.

[0059] At least two cell module assemblies (100) of FIG. 4 are arranged along the y-axis direction, and the cell module assemblies (100) can be mounted on the bottom frame (400) of the pack frame. In FIG. 1, four cell module assemblies (100) are illustrated as being arranged, but this is not limited thereto.

[0060] In the battery pack according to the present embodiment, an insulating plate (550) may be placed between the bottom frame (400) and the cell module assembly (100). At this time, the lower part of the cell module assembly (100) may be in contact with the upper part of the insulating plate (550). The insulating plate (550) maintains electrical insulation between the battery cells (110) included in the cell module assembly (100) and the bottom frame (400).

[0061] The cover plate (300) according to the present embodiment is formed on each side of the battery cell stack (120) spaced apart from each other in the stacking direction of the battery cells (110) (y-axis direction in FIG. 1) so as to cover the battery cell stack (120).

[0062] The cover assembly (200) according to the present embodiment may be formed on each side of the cell module assembly (100) spaced apart from each other in the stacking direction of the battery cells (110) (y-axis direction in FIG. 1) to cover the cover plate (300). The first side of the battery cell stack (120) on which the cover assembly (200) is formed and the second side of the battery cell stack on which the bus bar frame (150) included in the cell module assembly (100) is formed may intersect each other. In other words, with respect to the cell module assembly (100), the side on which the cover assembly (200) is formed and the side on which the bus bar frame (150) is formed may be perpendicular to each other.

[0063] According to the present embodiment, the cover assembly (200) may be formed with an inlet (250) through which external air is introduced and an outlet (260) through which air passing through the cell module assembly (100) is discharged. Specifically, the inlet (250) is formed in the cover assembly (200) covering one side of the cell module assembly (100), and the outlet (260) is formed in the cover assembly (200) covering the other side of the cell module assembly (100). According to the present embodiment, the inlet (250) and the outlet (260) may be arranged diagonally from each other when viewed from a plan view. Here, when viewed from a plan view, it may refer to an arrangement when the battery pack is viewed along the z-axis direction in FIG. 2.

[0064] Fig. 5 is a front view showing the bus bar frame viewed in the -x-axis direction of Fig. 1.

[0065] Referring to FIG. 5, the bus bar frame (150) according to the present embodiment is positioned on one side of the battery cell stack (120), and can cover the battery cell stack (120) and simultaneously guide the connection between the battery cell stack (120) and an external device. For example, the bus bar frame (150) may be equipped with a bus bar (130), a terminal bus bar (not shown), and an inter bus bar (not shown). The battery cells (110) included in the battery cell stack (120) may be connected in series or in parallel by the bus bar (130), the terminal bus bar, or the inter bus bar, and the battery cells (110) may be electrically connected to an external device or circuit through the terminal bus bar exposed to the outside of the cell module assembly (100).

[0066] The bus bar frame (150) may include an electrically insulating material. The bus bar frame (150) may prevent a short circuit by limiting contact between the bus bar (130) or the terminal bus bar and the battery cells (110) except for the portion where the bus bar (130) or the terminal bus bar is connected to the electrode leads (111, 112).

[0067] At least one hole (150H) may be formed in the bus bar frame (150) according to the present embodiment. After external air is introduced into the pack frame (350) through the inlet (250) illustrated in FIG. 2 included in the battery pack according to the present embodiment, the air may be introduced into a space formed above the battery cell stack (120) and / or below the battery cell stack (120) through the hole (150H) formed in the bus bar frame (150). The air introduced in this way may act as a coolant that cools the heat generated in the battery cells (110). The path through which the coolant moves and the process of cooling the battery cells (110) according to the present embodiment will be described later.

[0068] The hole (150H) according to the present embodiment may include a middle hole (150MH) formed in the middle portion based on the height in FIG. 5 and a lower hole (150LH) formed at the bottom of the bus bar frame (150).

[0069] Referring to FIGS. 2 and 6 below, the movement path of the refrigerant and the battery cell cooling process according to one embodiment of the present invention will be described.

[0070] Fig. 6 is a cross-sectional view showing the movement of air along the zx plane of Fig. 1.

[0071] Referring to FIGS. 2 and 6, external air can be introduced into the pack frame (350) through the inlet (250). The air introduced through the inlet (250) can flow along one side of the cell module assembly (100). For example, the air introduced through the inlet (250) can move along the first air flow path (F1). The first air flow path (F1) can be formed in a straight line with the direction in which the inlet (250) is formed. The direction in which air is introduced into the inlet (250) corresponds to the y-axis direction in FIG. 2, and the first air flow path (F1) can extend along the y-axis direction.

[0072] Air introduced into the first air passage (F1) can be introduced into the space between the pack frame (350) and the cell module assembly (100) through the middle hole (150MH) and the lower hole (150LH) formed in the bus bar frame (150). The space between the pack frame (350) and the cell module assembly (100) may correspond to a gap (350G) formed between the upper frame (500) of the pack frame and the upper end of the cell module assembly (100) and between the bottom frame (400) of the pack frame and the lower end of the cell module assembly (100). At this time, the gap (350G) formed between the upper frame (500) of the pack frame and the upper end of the cell module assembly (100) and the gap (350G) formed between the bottom frame (400) of the pack frame and the lower end of the cell module assembly (100) may each become a second air passage (F2).

[0073] Accordingly, the air introduced into the first air path (F1) can be introduced again into the second air path (F2) to cool the edge portion (110E) of the battery cell (110). The edge portion (110E) of the battery cell (110) may correspond to the upper and lower portions of the battery cell (110), as described in FIG. 3.

[0074] As illustrated in Fig. 6, the second air flow path (F2) at the upper portion of the battery cell (110) can receive air introduced through the empty space between the bus bar frame (150) and the upper frame (500) of the pack frame and air introduced through the middle hole (150MH). That is, the upper portion of the bus bar frame (150) and the upper frame (500) of the pack frame can be spaced apart.

[0075] The second air passage (F2) at the lower end of the battery cell (110) can accommodate air introduced through the middle hole (150MH) and air introduced through the lower hole (150LH). At this time, in order to form the second air passage (F2) at the lower end, the battery cell stack (120) is spaced apart from the bottom frame (400). When an insulating plate (550) is interposed between the bottom frame (400) and the battery cell stack (120), the battery cell stack (120) can be spaced apart from the insulating plate (550). For this purpose, the lower end of the bus bar frame (150) can be in direct contact with the bottom frame (400) of the pack frame. In other words, the level of the bottom end of the bus bar frame (150) can be lower than the level of the bottom end of the battery cell stack (120).

[0076] According to the present embodiment, in the process of the air of the first air path (F1) moving to the second air path (F2) through the central hole (150MH) and the lower hole (150LH) formed in the bus bar frame (150), the air may directly meet the electrode leads (111, 112) protruding from the battery cell (110). The portion of the electrode leads (111, 112) where the air directly meets may be the electrode lead portion located in the space between the bus bar frame (150) and the battery cell stack (120). The electrode lead portion may be different from the electrode lead portion protruding out of the bus bar frame (150) and connected to the bus bar (130) in FIG. 5. Therefore, according to the present embodiment, since air for cooling the battery cell edge portion (110E) can sufficiently be introduced through the hole (150H) of the bus bar frame (150), the cooling efficiency can be improved. Additionally, considerable heat may be generated in the portion of the electrode leads (111, 112) protruding from the battery cell (110) while positioned inside the bus bar frame (150), and cooling efficiency may be further improved by allowing air to pass through this portion for cooling.

[0077] Since there is insufficient space between the bus bar frame (150) and the pack frame (350), the air introduced through the empty space between the bus bar frame (150) and the upper frame (500) of the pack frame is relatively small. Accordingly, the air introduced through the middle hole (150MH) and the lower hole (150LH) formed according to the present embodiment can increase the cooling efficiency of the edge portion (110E) of the battery cell (110).

[0078] After the air moves along the cell edge portion (110E), the air that has been heated by absorbing the heat of the battery cell (110) can be discharged to the third air passage (F3) through the central hole (150MH) and the lower hole (150LH) formed in the bus bar frame (150) adjacent to the outlet (260). The air that has entered the third air passage (F3) can be discharged to the outside of the pack frame (350) through the outlet (260).

[0079] The third air path (F3) may be formed in a straight line with the direction in which the outlet (260) is formed. The direction in which air is discharged to the outlet (260) corresponds to the y-axis direction in FIG. 2, and the third air path (F3) may extend along the y-axis direction.

[0080] According to the present embodiment, the first air flow path (F1) and the third air flow path (F3) may be formed in the same direction as the stacking direction of the battery cells (110), and the second air flow path (F2) may be formed in a direction perpendicular to the stacking direction of the battery cells (110).

[0081]

[0082] The battery module and battery pack containing the battery module described above can be applied to various devices. These devices include, but are not limited to, means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles. However, the present invention is not limited thereto and can be applied to various devices that can utilize the battery module and battery pack containing the battery module, which also fall within the scope of the present invention.

[0083]

[0084] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0085]

[0086] 100: Cell module assembly

[0087] 110E: Edge

[0088] 120: Battery cell stack

[0089] 150H: Hall

[0090] 155: Fixed member

[0091] 200: Cover assembly

[0092] 250: Inlet

[0093] 260: Outlet

[0094] 300: Cover plate

[0095] 350: Pack Frame

[0096] 350G: Gap

Claims

1. A cell module assembly including a battery cell stack including a plurality of stacked battery cells, and a bus bar frame covering each of both sides of the battery cell stack, and Includes a pack frame on which the above cell module assembly is mounted, A gap is formed between the pack frame and the upper part of the cell module assembly and between the pack frame and the lower part of the cell module assembly, A battery pack in which air flows into the gap through a hole formed in the bus bar frame to cool the edge portion of the battery cell.

2. In paragraph 1, Further comprising a cover assembly covering both sides of the cell module assembly spaced apart from each other in the stacking direction of the battery cells, A battery pack in which each of the above cover assemblies has an inlet through which external air flows in and an outlet through which air passing through the cell module assembly is discharged.

3. In paragraph 2, A battery pack in which air introduced through the inlet flows along one side of the cell module assembly, the air is introduced into the gap through a hole formed in the busbar frame, and the air passing through the gap is discharged through the outlet.

4. In paragraph 3, A battery pack in which the above inlet and the above outlet are arranged diagonally relative to each other when viewed on a plane.

5. In paragraph 3, It includes a first air passage formed in a straight line with the direction in which the inlet is formed, a second air passage formed between the pack frame and the cell module assembly, and a third air passage formed in a straight line with the direction in which the outlet is formed. A battery pack wherein the first air path and the third air path are formed in the same direction as the stacking direction of the battery cells, and the second air path is formed in a direction perpendicular to the stacking direction of the battery cells.

6. In paragraph 5, The second air path is a battery pack corresponding to the gap into which air flows in through a hole formed in the busbar frame.

7. In paragraph 2, A battery pack in which the first side of the battery cell stack on which the cover assembly is formed and the second side of the battery cell stack on which the bus bar frame is formed intersect each other.

8. In paragraph 7, A battery pack further comprising a cover plate positioned between the cover assembly and the first side of the battery cell stack.

9. In paragraph 1, A battery pack in which air introduced through a hole formed in the above bus bar frame directly meets the electrode leads protruding from the battery cells and cools the electrode leads.

10. In paragraph 9, The electrode lead portion that meets the air introduced through the hole is a battery pack located in the space between the bus bar frame and the battery cell stack.

11. In paragraph 9, The above hole includes a middle hole formed in the middle portion of the bus bar frame and a lower hole formed in the lower portion of the bus bar frame, A battery pack in which air introduced through the above-mentioned middle hole directly contacts the above-mentioned electrode leads.

12. In paragraph 1, A battery pack further comprising an insulating plate positioned between the bottom portion of the pack frame and the cell module assembly.

13. In paragraph 1, The above pack frame is, A bottom frame facing the lower part of the above cell module assembly, An upper frame covering the upper portion of the above cell module assembly, and Includes a side frame that surrounds the left and right sides of the above cell module assembly, The above side frame is a battery pack that surrounds the above bus bar frame.

14. In paragraph 13, A battery pack in which the upper part of the bus bar frame and the upper frame of the pack frame are spaced apart, and the lower part of the bus bar frame and the bottom frame of the pack frame are in direct contact.

15. A device comprising at least one battery pack according to paragraph 1.

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