KR20240051548A - Battery pack and device including the same - Google Patents

Abstract

A battery pack according to an embodiment of the present invention includes a battery module including a plurality of battery cells; a pack housing that stores the battery module; and a plurality of vertical beams disposed on the bottom of the pack housing so as to be perpendicular to one surface of the bottom of the pack housing. The battery module is disposed between the vertical beams, and flange portions protruding from side surfaces of the battery module are fastened to the vertical beams.

Description

Battery pack and device including the same {BATTERY PACK AND DEVICE INCLUDING THE SAME}

The present invention relates to a battery pack and a device including the same, and more specifically, to a battery pack that has improved structural stability and can control swelling of battery cells and a device including the same.

In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras becomes routine, the development of technologies in fields related to the above mobile devices is becoming more active. In addition, secondary batteries that can be charged and discharged are a way to solve air pollution from existing gasoline vehicles that use fossil fuels, and are used in electric vehicles (EV), hybrid electric vehicles (HEV), and plug-in hybrid electric vehicles ( As it is used as a power source for batteries such as P-HEV), the need for development of secondary batteries is increasing.

Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries rarely have a memory effect compared to nickel-based secondary batteries, so they can be freely charged and discharged. , it is in the spotlight for its very low self-discharge rate and high energy density.

These lithium secondary batteries mainly use lithium-based oxide and carbon material as positive and negative electrode active materials, respectively. A lithium secondary battery includes an electrode assembly in which positive and negative electrode plates each coated with the positive and negative electrode active materials are disposed with a separator in between, and a battery case that seals and stores the electrode assembly together with an electrolyte.

In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built in a pouch of an aluminum laminate sheet, depending on the shape of the exterior material.

In the case of secondary batteries used in small devices, 2-3 battery cells are placed, but in the case of secondary batteries used in medium to large devices such as automobiles, a battery module is made by electrically connecting multiple battery cells. This is used. These battery modules have improved capacity and output by connecting multiple battery cells in series or parallel to form a battery cell stack. Additionally, one or more battery modules may be mounted together with various control and protection systems such as a Battery Disconnect Unit (BDU), Battery Management System (BMS), and cooling system to form a battery pack.

When constructing a battery pack, it is common to construct the battery pack by first constructing the battery module and then adding other components using the battery module. In the case of conventional battery packs, battery modules are manufactured by placing them in a housing structure such as a pack tray, and these battery packs are mounted on automobiles, etc.

Figure 1 is a perspective view showing a conventional battery module mounted on a pack housing, and Figure 2 is a cross-sectional view taken along the cutting line A-A' of Figure 1.

Referring to Figures 1 and 2, the conventional battery module 10 accommodates a plurality of battery cells 11 in the module frame 20 and then installs an end plate 50 in the open portion of the module frame 20. ) can be manufactured by conjugating. When a plurality of battery modules 10 are gathered together to form a battery pack, or when a battery module is mounted on a car, etc., each battery module 10 may be stored in the pack housing 12 and fixed to the pack housing 12.

At this time, the conventional battery module 10 can be fixed by forming a mounting structure at four corners. Specifically, mounting holes 50H into which the bolt member 13B can be inserted may be formed at both ends of the end plate 50 of the battery module 10. The bolt member 13B is inserted into the mounting hole 50H in a downward direction, and the nut member 13N is coupled to the end of the bolt member 13B, thereby fixing the battery module 10 to the pack housing 12. It can be.

The battery pack must satisfy various functions. For example, first, structural stability against various environments, vibration, shock, etc. must be satisfied. However, the conventional battery module 10 has insufficient structural stability because it has a mounting structure formed at four corners. In particular, in the case of the battery module 10 whose size has been increased to increase capacity, this fixing method may be vulnerable to structural stability.

Second, it must be possible to control the swelling phenomenon of battery cells that occurs during the charging and discharging process of battery cells. During repeated charging and discharging of the battery cells 11, the electrolyte inside them decomposes and gas is generated, which may cause the battery cells 11 to swell, that is, a swelling phenomenon. As indicated by arrow S in FIGS. 1 and 2, the battery cells 11 may be expanded along the stacking direction. If the swelling of the battery cells 11 is not controlled, structural deformation of the battery module 10 in which multiple battery cells 11 are stacked may occur, and the durability and performance of the battery module 10 may be adversely affected. may have an impact.

In particular, recently, pure Si cells and cells with high SiO content are used as battery cells to manufacture high-capacity battery modules and battery packs, and in the case of these cells, the degree of swelling is greater. In other words, in order to manufacture high-capacity battery modules and battery packs, it is essential to effectively control the swelling of the battery cells 11 inside the battery module or battery pack.

Therefore, there is a need to develop technology for battery packs that can improve structural stability and effectively control swelling of battery cells.

The problem to be solved by the present invention is to provide a battery pack that has improved structural stability and can effectively control swelling of battery cells, and a device including the same.

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

A battery pack according to an embodiment of the present invention includes a battery module including a plurality of battery cells; a pack housing that stores the battery module; and a plurality of vertical beams disposed on the bottom of the pack housing so as to be perpendicular to one surface of the bottom of the pack housing. The battery module is disposed between the vertical beams, and flange portions protruding from side surfaces of the battery module are fastened to the vertical beams.

The flange portion may be a plate-shaped member protruding in a direction perpendicular to one surface of the side portion of the battery module, and a mounting hole may be formed in the flange portion, and a bolt member may pass through the mounting hole and be attached to the vertical beam. can be concluded.

A fastening hole with a thread may be formed on the upper surface of the vertical beam, and the bolt member may pass through the mounting hole and be fastened to the fastening hole of the vertical beam.

The battery module includes a battery cell stack in which the battery cells are stacked; and a module frame in which the battery cell stack is accommodated, and the flange portions may be formed on side surfaces of the module frame.

The battery cell may be a pouch cell. The battery cells may be stacked within the battery cell stack while one side of the battery cells is erected parallel to the side portion of the module frame.

The flange portions may include first flange portions protruding from a first side portion of the battery module and second flange portions protruding from a second side portion of the battery module.

One of the second flange parts may be located at a portion corresponding to a midpoint between the first flange parts, based on the width direction between the first side part and the second side part.

One of the first flange parts may be located at a portion corresponding to a midpoint between the second flange parts, based on the width direction between the first side part and the second side part.

The first flange portion and the second flange portion may have the same shape.

The first flange portion and the second flange portion may have a trapezoidal, triangular, or square shape.

The battery module may be composed of a plurality of battery modules, and a first battery module and a second battery module among the plurality of battery modules may be disposed on the bottom of the pack housing. The flange portion of the first battery module and the flange portion of the second battery module may be fastened to one of the vertical beams located between the first battery module and the second battery module.

The flange portions may include first flange portions protruding from a first side portion of the battery module and second flange portions protruding from a second side portion of the battery module. The first flange portion protruding from the first side portion of the first battery module and the second flange portion protruding from the second side portion of the second battery module are between the first battery module and the second battery module. It can be fastened to one of the vertical beams located at. Along the direction in which the vertical beam extends, the first flange portion of the first battery module and the second flange portion of the second battery module may be alternately positioned.

The second flange portion of the second battery module may fit into the space between the first flange portions of the first battery module, and the first battery may fit into the space between the second flange portions of the second battery module. The first flange portion of the module may fit.

The flange portion may be located closer to the upper surface of the battery module than to the lower surface of the battery module, in the height direction of the battery module.

The device according to this embodiment includes the battery pack.

According to embodiments of the present invention, the battery module can be stably fixed to the pack housing by fastening the flange portion formed on the side surface of the battery module to the vertical beam of the pack housing. At the same time, because the vertical beam of the pack housing presses the side part of the battery module, swelling of the battery cells can be effectively controlled.

Additionally, according to embodiments of the present invention, a plurality of adjacent battery modules are fastened to one vertical beam located between them, thereby improving space utilization.

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.

Figure 1 is a perspective view showing a conventional battery module mounted on a pack housing.
Figure 2 is a cross-sectional view taken along the cutting line A-A' in Figure 1.
Figure 3 is a perspective view of a battery module according to an embodiment of the present invention.
Figure 4 is an exploded perspective view of the battery module of Figure 3.
Figure 5 is a perspective view showing the battery cell stack and the first and second bus bar assemblies included in the battery module of Figure 4.
Figure 6 is a plan view showing one of the battery cells included in the battery cell stack of Figure 5.
Figure 7 is a perspective view showing the first battery cell stack and first bus bar assembly included in the battery module of Figure 5.
Figure 8 is an exploded perspective view of the first battery cell stack and first bus bar assembly of Figure 7.
Figure 9 is a perspective view showing side plates further disposed on the battery cell stack and the first and second bus bar assemblies of Figure 5.
FIG. 10 is an enlarged partial view of A1 in FIG. 5.
Figure 11 is an enlarged partial view of A2 in Figure 5.
Figure 12 is a diagram showing the current movement path between the first battery cell stack and the second battery cell stack.
Figure 13 is a perspective view showing a battery pack according to an embodiment of the present invention.
FIG. 14 is an enlarged partial view showing the flange portion of the battery module of FIG. 13 being mounted on a vertical beam disposed on the pack housing.
Figure 15 is an enlarged plan view of portion A of Figure 3.
Figure 16 is a front view showing a battery pack according to an embodiment of the present invention.
Figure 17 is a plan view showing a battery pack according to an embodiment of the present invention.
Figures 18 (a), (b), and (c) are partial views showing various shapes of the flange portion according to various embodiments of the present invention.

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

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown. In the drawing, the thickness is enlarged to clearly express various layers and areas. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” or “on” another part, this includes not only cases where it is “directly above” another part, but also cases where there is another part in between. . Conversely, when a part is said to be “right on top” of another part, it means that there is no other part in between. In addition, being “on” or “on” a standard part means being located above or below the standard part, and it necessarily means being “on” or “on” the direction opposite to gravity. no.

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

In addition, throughout the specification, when referring to “on a plane,” this means when the target part is viewed from above, and when referring to “in cross-section,” this means when a cross section of the target portion is cut vertically and viewed from the side.

Figure 3 is a perspective view of a battery module according to an embodiment of the present invention. Figure 4 is an exploded perspective view of the battery module of Figure 3. Figure 5 is a perspective view showing the battery cell stack and the first and second bus bar assemblies included in the battery module of Figure 4. Figure 6 is a plan view showing one of the battery cells included in the battery cell stack of Figure 5.

Referring to FIGS. 3 to 6 , a battery pack according to an embodiment of the present invention includes at least one battery module 100. First, the structure of the battery module 100 will be described. The battery module 100 according to an embodiment of the present invention includes a battery cell stack 120 in which a plurality of battery cells 110 are stacked and a module frame 200 that accommodates the battery cell stack 120. can do.

The battery cell stack 120 may include a first battery cell stack 120a and a second battery cell stack 120b. However, as another embodiment of the present invention, it is also possible to store only a single battery cell stack inside the module frame.

The battery cell 110 is a pouch-type battery cell and may include electrode leads 130 protruding in both directions. Such a pouch-type battery cell can be formed by storing an electrode assembly in a pouch case of a laminate sheet including a resin layer and a metal layer, and then bonding the outer periphery of the pouch case. These battery cells 110 may have a rectangular sheet structure. Specifically, the battery cell 110 according to this embodiment has a structure in which two electrode leads 130 each protrude from one end 114a and the other end 114b of the battery body 113. More specifically, the electrode leads 130 may protrude in opposite directions, and one of these electrode leads 130 may be a positive electrode lead and the other may be a negative lead. In this embodiment, the direction between the electrode leads 130 protruding in both directions of the battery cell 110 is referred to as the longitudinal direction of the battery cell 110. For example, referring to Figures 5 and 6, the direction parallel to the x-axis may correspond to the longitudinal direction of the battery cell 110.

The battery cell 110 is manufactured by storing the electrode assembly (not shown) in the battery case 114 and adhering both ends 114a and 114b of the battery case 114 and one side 114c connecting them. It can be. In other words, the battery cell 110 according to an embodiment of the present invention has a total of three sealing parts, and the sealing parts are structured to be sealed by a method such as fusion, and the other side may be made of a folding part 115. .

These battery cells 110 may be composed of a plurality, and the plurality of battery cells 110 are stacked so as to be electrically connected to each other to form the battery cell stack 120. In particular, the battery cells 110 may be stacked in one direction with the battery cells 110 standing upright and one side of the battery body 113 of the battery cells 110 facing each other. More specifically, as shown in FIGS. 3 to 6, one side of the battery body 113 of the battery cell 110 is parallel to the first and second side parts 210 and 220 of the module frame 200, The battery cells 110 may be stacked in an upright direction from one of the first and second side portions 210 and 220 of the module frame 200 to the other. As an example, a plurality of battery cells 110 are shown stacked along a direction parallel to the y-axis. In this way, when a plurality of battery cells 110 are stacked along a direction parallel to the y-axis, the electrode leads 130 in one battery cell 110 may protrude along the x-axis direction and the -x-axis direction, respectively. .

In one area, a plurality of battery cells 110 are stacked along a direction parallel to the y-axis to form a first battery cell stack 120a, and in another area, a plurality of battery cells 110 are parallel to the y-axis. They can be stacked along one direction to form the second battery cell stack 120b. However, this is an exemplary structure, and there is no limit to the number of battery cell stacks included in the battery module 100.

The battery case 114 generally has a laminate structure of a resin layer/metal thin film layer/resin layer. For example, when the battery case surface is made of an O (oriented)-nylon layer, when multiple battery cells are stacked to form a medium to large-sized battery module, it tends to slip easily due to external impact. Therefore, in order to prevent this and maintain a stable stacked structure of the battery cells, an adhesive member such as an adhesive such as a double-sided tape or a chemical adhesive that is bonded by a chemical reaction during adhesion is attached to the surface of the battery case to form the first battery cell. A stack 120a and a second battery cell stack 120b can be formed.

Meanwhile, along the direction perpendicular to the direction in which the battery cells 110 in the first battery cell stack 120a or the second battery cell stack 120b are stacked, the first battery cell stack 120a and the second battery cell stack 120b are stacked. Two battery cell stacks 120b are disposed. In other words, the first battery cell stack 120a and the second battery cell stack 120b may be arranged along the direction in which the electrode leads 130 protrude with respect to the battery cell 110. That is, the first battery cell stack 120a and the second battery cell stack 120b are arranged along the longitudinal direction of the battery cell 110. For example, as shown in Figure 5, a plurality of battery cells 110 are stacked along a direction parallel to the y-axis to form a first battery cell stack 120a and a second battery cell stack 120b. When doing so, the first battery cell stack 120a and the second battery cell stack 120b may be positioned along a direction parallel to the x-axis.

The module frame 200 may be used to protect the battery cell stack 120 and the electrical equipment connected thereto from external physical shock. The battery cell stack 120 and the electrical components connected thereto may be accommodated in the internal space of the module frame 200. The module frame 200 may include a first side portion 210, a second side portion 220, an upper surface portion 230, and a lower surface portion 240. Flange portions 200F, which will be described later, are formed on the first side portion 210 and the second side portion 220.

The structure of the module frame 200 may vary. According to one embodiment of the present invention, the structure of the module frame 200 may be a mono frame structure. Here, the mono frame may be in the form of a metal plate in which the first side portion 210, the second side portion 220, the upper surface portion 230, and the lower surface portion 240 are integrated. Monoframes can be manufactured by extrusion molding.

However, the structure of the module frame 200 is not limited to this, and in another embodiment, the module frame 200 may have a structure in which a U-shaped frame and an upper plate are combined. In this case, the U-shaped frame may have a first side portion 210, a second side portion 220, and a lower surface portion 240, and the upper plate may be a plate-shaped upper surface portion 230. At this time, each frame or plate constituting the U-shaped frame may be manufactured by press molding. Additionally, the structure of the module frame 200 may be provided as an L-shaped frame in addition to a mono frame or U-shaped frame, and may also be provided in various structures not described in the above example.

The module frame 200 may be open on both sides. More specifically, the module frame 200 may be provided in an open form along the longitudinal direction of the battery cell 110. In this case, the front and back sides of the battery cell stack 120 may not be covered by the module frame 200. The front and rear sides of the battery cell stack 120 may be covered by the first and second bus bar assemblies 300a and 300b, the sealing assembly 400, or the end plate 500, which will be described later, through which the battery cells The front and back sides of the laminate 120 may be protected from external physical shock, etc.

The battery module 100 includes first bus bar assemblies 300a located on one side and the other of the first battery cell stack 120a, respectively, and located on one side and the other of the second battery cell stack 120b. It may include second bus bar assemblies 300b. Specifically, the first bus bar assemblies 300a may be located in a direction in which the electrode leads 130 of the battery cells 110 included in the first battery cell stack 120a protrude. Additionally, the second bus bar assemblies 300b may be located in a direction in which the electrode leads 130 of the battery cells 110 included in the second battery cell stack 120b protrude. The first bus bar assembly 300a and the second bus bar assembly 300b may each include a bus bar frame, a bus bar, and a terminal bus bar, which will be described later.

The battery module 100 may include a sealing assembly 400. The sealing assembly 400 may be positioned on both open sides of the module frame 200 to cover the battery cell stack 120. The sealing assembly 400 located on one open side of the module frame 200 is the first sealing assembly 410, and the sealing assembly 400 located on the other open side of the module frame 200 is the second sealing assembly. It may be an assembly 450. That is, the battery module 100 according to this embodiment may further include a first sealing assembly 410 and a second sealing assembly 450 that cover both open sides of the module frame 200, respectively.

The battery module 100 may include an inlet 421 and an outlet 461 for circulating refrigerant inside the module frame 200. The refrigerant may flow into the module frame 200 through the inlet 421 and then be discharged to the outside of the battery module 100 through the outlet 461. An inlet 421 may be formed in the first sealing assembly 410, and an outlet 461 may be formed in the second sealing assembly 450. The refrigerant directly contacts the battery cell stack 120, the first and second bus bar assemblies 300a, 300b, and other electrical components stored inside the module frame 200, and dissipates heat generated therefrom. It can be delivered. The refrigerant may be a fluid. However, since the refrigerant is in direct contact with the battery cell stack 120, the first and second bus bar assemblies 300a and 300b, and other electrical components within the battery module 100, the refrigerant must be electrically insulated. Needs to be. Therefore, the refrigerant may be a material with insulating properties. As an example, the refrigerant may be insulating oil.

The sealing assembly 400 may separate both open sides of the module frame 200 from the external environment. When refrigerant is injected into the module frame 200, the sealing assembly 400 may serve to seal the refrigerant to prevent it from leaking to the outside.

The end plate 500 may be positioned on both open sides of the module frame 200 to cover the sealing assembly 400. The end plate 500 located on one open side of the module frame 200 is the first end plate 510, and the end plate 500 located on the other open side of the module frame 200 is the second end. It may be plate 550.

This end plate 500 can physically protect the battery cell stack 120 and other electrical components from external shock.

Below, the components included in the battery module 100 of this embodiment will be described in detail.

Figure 7 is a perspective view showing the first battery cell stack and first bus bar assembly included in the battery module of Figure 5. Figure 8 is an exploded perspective view of the first battery cell stack and first bus bar assembly of Figure 7. Figure 9 is a perspective view showing side plates further disposed on the battery cell stack and the first and second bus bar assemblies of Figure 5.

Referring to FIGS. 5 and 7 to 9 together, as described above, the battery cell stack 120 includes a first battery cell stack 120a and a second battery cell stack 120a disposed along the longitudinal direction of the battery cell 110. It may include a battery cell stack (120b). In addition, first bus bar assemblies 300a may be located on one side and the other of the first battery cell stack 120a, and second bus bars may be located on each of one side and the other side of the second battery cell stack 120b. Assemblies 300b may be located.

At this time, the first battery cell stack 120a and the first bus bar assembly 300a may be collectively referred to as the first sub-module 100a, and the second battery cell stack 120b and the second bus The bar assembly 300b may be collectively referred to as the second sub-module 100b. Specifically, the battery module 100 according to this embodiment may be one in which the first sub-module 100a and the second sub-module 100b disposed inside the module frame 200 are electrically coupled to each other.

First, the first sub-module 100a may include a first battery cell stack 120a and a first busbar assembly 300a. First bus bar assemblies 300a may be located on one side and the other side of the first battery cell stack 120a, respectively. The first bus bar assemblies 300a may be located in a direction in which the electrode leads 130 of the battery cells 110 included in the first battery cell stack 120a protrude. Additionally, a first flexible printed circuit board (FPCB) 350a may be provided that is electrically connected to the first bus bar assemblies 300a.

The first battery cell stack 120a includes a plurality of battery cells 110, at least one first cooling fin 210a located between the plurality of battery cells 110, and the first battery cell 110. It may include a first compression pad 250a provided on one side of the battery cell 110 located on the outside.

The first cooling fin 210a may be located between the plurality of battery cells 110. For example, the first cooling fin 210a may be located between two battery cells 110. Specifically, one first cooling fin 210a and the other adjacent first cooling fin 210a may be positioned with two battery cells 110 between them.

The first cooling fin 210a may include a first plate 211a in contact with one side of the battery cell 110. Here, one side of the battery cell 110 is one side of the battery body 113 (see FIG. 6) of the battery cell 110, and may be one side of the battery cell 110 extending along the longitudinal direction (x-axis direction). there is.

One side of the first plate 211a may be in contact with one side of the battery cell 110 that faces one side of the first plate 211a. The other surface of the first plate 211a may be in contact with one surface of another adjacent battery cell 110 that faces the other surface of the first plate 211a. In this case, although not specifically shown, an adhesive member is interposed between the side of the battery cell 110 and the first plate 211a, so the battery cell 110 and the first plate 211a can be fixed by adhesive. there is. For example, the adhesive member may be an insulating tape.

The upper surface (z-axis direction) of the first plate 211a may be in contact with the upper surface portion 230 of the module frame 200, and the lower surface of the first plate 211a may be in contact with the lower surface portion 240 of the module frame 200. ) can be contacted. As a result, the first cooling fin 210a can be fixedly positioned within the module frame 200, and as a result, the battery cell 110 attached to the first cooling fin 210a can also be positioned within the module frame 200. It can be positioned fixedly.

When the size of the first plate 211a is larger than the size of the battery cell 110, the upper and lower portions of the battery cell 110 are spaced at a certain distance from the upper and lower surfaces 230 and 240 of the module frame 200. It can be positioned while having . Specifically, when the height of the first plate 211a is longer than the height of the battery cell 110, the battery cell 110 may be positioned at the center of the first plate 211a and fixed by adhesive. In this case, the upper and lower parts of the battery cell 110 may be positioned at a constant distance from the upper and lower surfaces 230 and 240 of the module frame 200. Here, the height of the battery cell 110 and the first plate 211a refers to the length in the z-axis direction.

The first cooling fin 210a may further include a first plate 211a and a first protrusion 213a where one end of the first plate 211a protrudes. For example, the first cooling fin 210a may have an L shape. Specifically, referring to FIG. 8, the first cooling fin 210a includes a first plate 211a having a side corresponding to or larger than one side of the battery cell 110, and one end of the first plate 211a. It may include a first protrusion 213a protruding parallel to the stacking direction (y-axis direction) of the first battery cell stack 120a.

The first protrusion 213a is an area that protrudes in a direction perpendicular to the first plate 211a and may contact at least one of the upper surface 230 or the lower surface 240 of the module frame 200. Specifically, one surface of the first protrusion 213a may be positioned facing the upper or lower surface of the battery cell 110, and the other surface of the first protrusion 213a may be positioned against the lower surface 240 or the lower surface of the module frame 200. It may be in contact with the upper surface 230.

For example, one surface of the first protrusion 213a is located facing the lower surface of the battery cell 110, and the upper and lower surfaces of the battery cell 110 are aligned with the upper surface 230 and the lower surface of the module frame 200 ( It may be positioned at a certain height from 240 and adhesively fixed to the first plate 211a. That is, a certain space may be provided between one surface of the first protrusion 213a and the lower surface of the battery cell 110, and between the upper surface 230 of the module frame 200 and the upper surface of the battery cell 110. In this case, the distance between one surface of the first protrusion 213a and the lower surface of the battery cell 110 may correspond to the distance between the upper surface 230 of the module frame 200 and the upper surface of the battery cell 110. .

The other surface of the first protrusion 213a may contact the lower surface 240 of the module frame 200. Specifically, the other surface of the first protrusion 213a may be adhesively fixed while contacting the lower surface 240 of the module frame 200, whereby the first cooling fin 210a is fixed within the module frame 200. can be located.

However, the shape of the first cooling fin 210a is not limited to this drawing, and may be a flat plate shape, and any shape is possible as long as it can fix the battery cell 110 while contacting the battery cell 110. .

The first cooling fin 210a may be metal. Specifically, the first cooling fin 210a may be made of a metal with high thermal conductivity. Accordingly, the first cooling fin 210a can directly receive heat generated in the battery cell 110 by charging and discharging the battery. When heat is generated, the heat is transferred to the first cooling fin (210a) in contact with the side of the battery cell 110 and is primarily cooled, and the above-mentioned refrigerant directly contacts the upper and lower parts of the battery cell 110, causing 2 Cooling may be performed sequentially. As a result, direct cooling is possible even in the upper and lower areas of the battery cell, which were relatively difficult to cool in the past, and cooling efficiency can be improved.

The first compression pad 250a may be located on the outermost side of the first battery cell stack 120a. This first compression pad 250a may serve to absorb swelling of the battery cells 110 due to charging and discharging. Specifically, the first compression pad 250a prevents the battery case 114 (see FIG. 6) of the battery cells 110 from breaking by pushing the side portion of the module frame 200 as the battery cells 110 swell. , the safety of the battery module 100 can be improved.

However, the first compression pad 250a is not limited to being located only on the outermost side of the first battery cell stack 120a, and is located between the battery cells 110 constituting the first battery cell stack 120a. It can also be located in

The first bus bar assembly 300a may include a first bus bar frame 310a and a first bus bar 330a mounted on the first bus bar frame 310a.

The first bus bar frame 310a is located on one side of the first battery cell stack 120a, covering one side of the first battery cell stack 120a and at the same time forming the first battery cell stack 120a. It may be intended to guide connection with external devices. The first bus bar frame 310a may be located on one side and the other side of the first battery cell stack 120a.

A first bus bar 330a may be mounted on the first bus bar frame 310a. For a specific example, the inner surface of the first bus bar frame 310a may face the first battery cell stack 120a, and the outer surface of the first bus bar frame 310a may have a first bus bar 330a. Can be installed.

The first bus bar frame 310a may include an electrically insulating material. The first bus bar frame 310a may restrict contact of the first bus bar 330a with other parts of the battery cells 110 other than the part where the first bus bar 330a is joined to the electrode lead (not shown). Accordingly, it is possible to prevent an electrical short from occurring.

The first bus bar 330a is mounted on the outer surface of the first bus bar frame 310a, electrically connects the battery cells 110 included in the first battery cell stack 120a, and connects the first battery cell It may be for electrically connecting the laminate 120a and an external device circuit. The first bus bar 330a is located on the first bus bar frame 310a, and since this first bus bar assembly 300a is covered by the sealing assembly 400 and the end plate 500, which will be described later, external shock It can be protected from the elements, etc., and durability degradation due to external moisture, etc. can be minimized.

The first bus bar 330a may be electrically connected to the first battery cell stack 120a through the electrode lead 130 of the battery cell 110. Specifically, the electrode lead 130 of the battery cell 110 may be bent after passing through a slit formed in the first bus bar frame 310a and connected to the first bus bar 330a. The battery cells 110 included in the first battery cell stack 120a may be electrically connected in series or parallel by the first bus bar 330a. There is no particular limitation on the connection method between the electrode lead 130 and the first bus bar 330a, and for example, welding connection may be applied.

The first flexible printed circuit board 350a extends in the longitudinal direction of the battery cells 110 and is mounted to sense the battery cells 110. That is, as shown in FIGS. 7 and 8, the first flexible printed circuit board 350a is located on the upper surface of the first battery cell stack 120a and senses voltage data or thermal data of the battery cells 110. . In particular, the first flexible printed circuit board 350a may be bent toward the first bus bar frame 310a at one end and electrically connected to the first bus bar 330a. Accordingly, the voltage data of each battery cell 110 can be sensed and transmitted to the outside.

The second sub-module 100b may include a second battery cell stack 120b and a second bus bar assembly 300b, and the second bus bar assembly 300b may include a second bus bar frame 310b and It may include a second bus bar 330b. Additionally, a second flexible printed circuit board 350b may be provided to connect the second bus bar assemblies 300b.

The components including the second sub-module 100b may have the same or similar structure to the components of the first sub-module 100a described above. Therefore, to avoid duplication of explanation, detailed description of the components including the second sub-module 100b will be omitted.

As described above, within the battery module 100, the first sub-module 100a and the second sub-module 100b may be electrically connected to each other. That is, the battery module 100 according to this embodiment corresponds to a twin model battery module having a first sub-module 100a and a second sub-module 100b. However, this corresponds to an exemplary structure of the battery module according to this embodiment.

Meanwhile, side plates 200S may be provided on both sides of the first sub-module 100a and the second sub-module 100b. The side plate 200S may be a plate extending along the longitudinal direction of the battery cell 110. Specifically, the length of the side plate 200S may correspond to the sum of the lengths of the first sub-module 100a and the second sub-module 100b.

The side plate 200S is the outermost battery cell 110 among the battery cells 110 included in the first sub-module 100a and among the battery cells 110 included in the second sub-module 100b. It can be positioned facing the battery cell 110 located on the outermost side. Alternatively, the side plate 200S may be positioned facing the first compression pad 250a included in the first sub-module 100a and the second compression pad 250b included in the second sub-module 100b. .

The side plate 200S may be made of rigid metal. The side plate 200S is the uppermost part of the first sub-module 100a and the second sub-module 100b when the first sub-module 100a and the second sub-module 100b are inserted into the module frame 200. It may serve to protect the outer battery cell 110 or the compression pads 250a and 250b. In addition, the battery module 100 of this embodiment is a twin model having a first battery cell stack 120a and a second battery cell stack 120b, and the battery cell stack 120 is better than a typical battery cell stack 120. Because the length is long, it may not be easy to insert and assemble the module frame 200. In this case, the side plate 200S guides the insertion of the battery cell stack 120 into the module frame 200, allowing the battery module to be easily inserted without damaging the battery cells 110 and the compression pads 250a and 250b. can be assembled.

FIG. 10 is an enlarged partial view of A1 in FIG. 5. Figure 11 is an enlarged partial view of A2 in Figure 5.

Referring to FIGS. 5 and 10, a connection cable 380 is provided between the first sub-module 100a and the second sub-module 100b, thereby connecting the first sub-module 100a and the second sub-module ( 100b) may be electrically connected. The connection cable 380 may be a flexible flat cable (FFC).

The connection cable 380 may connect the first flexible printed circuit board 350a located in the first sub-module 100a and the second flexible printed circuit board 350b located in the second sub-module 100b. The voltage data or thermal data for the first battery cell stack 120a and the voltage data or thermal data for the second battery cell stack 120b are all stored together in a BMS (Battery Management System) external to the battery module 100. can be passed on. That is, a low voltage (LV) connection between the first sub-module 100a and the second sub-module 100b may be made by the connection cable 380. Here, the LV connection may refer to a sensing connection for detecting and controlling the voltage of the battery cell.

In addition, as described above, by connecting the first flexible printed circuit board 350a and the second flexible printed circuit board 350b through the connection cable 380, the overall height of the battery module 100 is reduced, thereby reducing the size of the battery itself. Energy density can be increased. In addition, installation space for the battery module 100 can be secured, and driving performance and fuel efficiency can be improved when the battery module 100 is installed in a device such as a car.

Referring to FIGS. 5 and 11 , the first sub-module 100a and the second sub-module 100b may be electrically connected by connecting electrode leads 130 to each other. Specifically, at least one electrode lead 130a among the battery cells 110 included in the first battery cell stack 120a and among the battery cells 110 included in the second battery cell stack 120b. At least one electrode lead 130b may be electrically connected while overlapping with each other. In this case, the two electrode leads 130a and 130b may be electrically connected while coming into contact with the connection bus bar 330. The two electrode leads 130a and 130b and the connection bus bar 330 may be welded and electrically connected to each other.

The two electrode leads 130a and 130b connected to the connection bus bar 330 are connected to the outermost battery cell 110 in the first battery cell stack 120a and the outermost battery cell 110 in the second battery cell stack 120b, respectively. It may be an electrode lead protruding from the outermost battery cell 110. The connection form of the two electrode leads 130a and 130b and the connection bus bar 330 is shown as being formed only in one area, but the same connection form can be provided in the opposite area based on the stacking direction of the battery cells 110. You can. The electrical connection relationship and the current movement path between the first battery cell stack 120a and the second battery cell stack 120b will be described in more detail below.

Figure 12 is a diagram showing the current movement path between the first battery cell stack and the second battery cell stack.

Referring to FIG. 12, in the electrically connected first sub-module 100a and the second sub-module 100b, one end is defined in the x-axis direction and the other end is defined in the -x-axis direction, The area where the first sub-module 100a and the second sub-module 100b are electrically connected may be defined as the connection area A3. Below, the connection structure of the electrode leads and the flow of current at one end, the other end, and the connection area A3 will be described in detail. In particular, for convenience of explanation, the electrode lead included in the first sub-module 100a is referred to as a first electrode lead, and the electrode lead included in the second sub-module 100b is referred to as a second electrode lead.

The first outermost electrode lead 130a1 located at one end of the first sub-module 100a and the first electrode lead 130a6 located adjacent thereto are electrically connected to the outside to form the first sub-module 100a. And current may be supplied to the second sub-module 100b. In this case, the current is supplied to the first sub-module 100a from the outside, but since the first electrode lead 130a and the second electrode lead 130b are electrically connected in the connection area A3, the current is supplied to the second sub-module 100a. It may also flow to the module 100b.

In the connection area A3, the first electrode lead 130a located on the outermost side of the first battery cell stack 120a of the first sub-module 100a and the second battery of the second sub-module 100b The second electrode leads 130b located on the outermost side of the cell stack 120b may be electrically connected to each other. Specifically, the outermost first electrode leads 130a2 and 130a3 located at the other end of the first sub-module 100a are the outermost second electrode leads 130b1 and 130b5 located at one end of the second sub-module 100b. ) can be electrically connected to.

In this case, electrode leads excluding the outermost first electrode leads 130a2 and 130a3 and the outermost second electrode leads 130b1 and 130b5 may be electrically connected to adjacent electrode leads. More specifically, at the other end of the first sub-module 100a, the first electrode leads excluding the outermost first electrode leads 130a2 and 130a3 may be electrically connected to adjacent first electrode leads in pairs. . At one end of the second sub-module 100b, similarly, the second electrode leads excluding the outermost second electrode leads 130b1 and 130b5 may be electrically connected to adjacent second electrode leads in pairs.

At one end of the first sub-module 100a excluding the connection area A3, the remaining first electrode leads 130a1 and the adjacent first electrode lead 130a6 are electrically connected to an external power source. The electrode leads may be electrically connected to adjacent first electrode leads. For example, adjacent first electrode leads may be electrically connected in pairs.

The other end of the second sub-module 100b, excluding the connection area A3, may be electrically connected to adjacent second electrode leads. For example, adjacent second electrode leads may be electrically connected in pairs. Here, the second outermost electrode leads 130b2 and 130b4 of the second sub-module 100b may also be electrically connected to each other by pairing with adjacent second electrode leads.

When the electrical connection of the electrode leads 130a and 130b is formed as described above, current may move along the electrical connection of the electrode leads 130a and 130b.

In other words, the arrow in this drawing means the flow of current, and the flow of current is not limited as described in this drawing, and a person skilled in the art can easily change the electrical connection of the electrode lead to facilitate the flow of current. Anything is possible if you change it.

In this embodiment, the first battery cell stack 120a and the second battery cell stack 120b arranged along the longitudinal direction within one battery module 100 are disposed to form a twin model battery module 100. formed. Compared to two battery modules of a single model containing one battery cell stack, the battery modules of the twin model of this embodiment can significantly reduce the space required in the longitudinal direction. That is, the battery module 100 according to this embodiment has the advantage of being able to reduce the number of parts and increase energy density or space utilization as the space required is reduced.

Below, the structure of the battery pack according to an embodiment of the present invention will be described in detail.

Figure 13 is a perspective view showing a battery pack according to an embodiment of the present invention. FIG. 14 is an enlarged partial view showing the flange portion of the battery module of FIG. 13 being mounted on a vertical beam disposed on the pack housing.

Referring to FIGS. 3, 4, 13, and 14 together, a battery pack 1000 according to an embodiment of the present invention includes a battery module 100 including a plurality of battery cells 110; A pack housing (1100) storing the battery module (100); and a plurality of vertical beams 1200 disposed on the bottom 1100F of the pack housing 1100 so as to be perpendicular to one surface of the bottom 1100F of the pack housing 1100. At least one battery module 100 is stored in the pack housing 1100. FIG. 13 shows two battery modules 100-1 and 100-2 being accommodated in the pack housing 1100 as an example. The battery module 100 is disposed between the vertical beams 1200, and the flange portions 200F protruding from the side portions 210 and 220 of the battery module 100 are fastened to the vertical beams 1200.

The pack housing 1100 is a structure with an internal space, and at least one battery module 100 can be accommodated therein. The battery module 100 is disposed between the vertical beams 1200 on the bottom 1100F of the pack housing 1100. Although not specifically shown, a pack cover may be disposed to cover the open top of the pack housing 1100.

At this time, in preparation for external vibration or impact, mounting fixation is required to secure the battery module 100 to the pack housing 1100. In the case of the battery module 100 according to this embodiment, the flange portion 200F is vertical. It is fixed to the beam 1200. The vertical beam 1200 extends along the direction in which the battery module 100 extends from the upper surface of the bottom portion 1100F of the pack housing 1100. Since the direction in which the battery module 100 extends is the same as the longitudinal direction of the battery cell, the vertical beam 1200 also extends along the longitudinal direction.

The flange portion 200F may be a plate-shaped member extending in a direction perpendicular to one surface of the side portions 210 and 220 of the battery module 100. Specifically, the battery module 100 includes a module frame 200 in which the battery cell stack 120 is accommodated, and flange portions 200F are formed on the side portions 210 and 220 of the module frame 200. You can. More specifically, a flange portion 200F may be formed on each of the first side portion 210 and the second side portion 220 of the module frame 200. That is, the flange portions 200F include first flange portions 200F1 protruding from the first side portion 210 of the battery module 100 and second flange portions 200F1 protruding from the second side portion 220 of the battery module 100. It may include flange portions 200F2.

A mounting hole 200MH may be formed in the flange portion 200F, and the bolt member 1300 may pass through the mounting hole 200MH and be fastened to the vertical beam 1200. More specifically, a fastening hole 1200H with a thread may be formed on the upper surface of the vertical beam 1200, and the bolt member 1300 may pass through the mounting hole 200MH of the flange portion 200F to form the vertical beam. It can be fastened to the fastening hole (1200H) of (1200).

In the same manner as above, the flange portion 200F is fastened to the vertical beam 1200 so that the battery module 100 can be fixed inside the battery pack 1000, and the vertical beam 1200 can be connected to the battery module 100 from the outside. It can cushion vibrations or shocks transmitted to the device.

Meanwhile, during repeated charging and discharging of the battery cells 110, the electrolyte inside them decomposes and gas is generated, which may cause the battery cells 110 to swell, that is, a swelling phenomenon. If the swelling of the battery cells 110 is not controlled, structural deformation of the battery module 100 in which multiple battery cells 110 are stacked may occur, and the durability and performance of the battery module 100 may be adversely affected. may have an impact.

In particular, recently, pure Si cells and cells with high SiO content are used as battery cells to manufacture high-capacity battery modules and battery packs, and in the case of these cells, the degree of swelling is greater. In other words, in order to manufacture high-capacity battery modules and battery packs, it is essential to effectively control the swelling of the battery cells 110 inside the battery module or battery pack.

Pouch-type battery cells 110 usually have a large degree of swelling in the thickness direction. As described above, inside the battery module 100, the battery cell 110 is erected so that one side of the battery cell 110 is parallel to the first side portion 210 and the second side portion 220 of the module frame 200. The structures directly related to swelling control because they are stacked are the first side portion 210 and the second side portion 220 of the module frame 200 disposed on both sides of the battery cell stack 120.

A first compression pad 250a and a second compression pad 250b may be provided inside the battery module 100, but when the degree of swelling of the battery cell 110 is large, the first compression pad 250a and the second compression pad 250b may be provided. 2 Control may be difficult using only the compression pad 250b.

Accordingly, this embodiment is designed to provide flange portions 200F on the side portions 210 and 220 of the battery module 100, and to fasten the flange portion 200F to the vertical beam 1200. The side portions 210 and 220 directly face the vertical beam 1200. That is, the mounting fixation is implemented through the flange portion 200F, and at the same time, the vertical beam 1200 can complement the rigidity and durability of the battery module 100 for swelling control. Even if the battery cells 110 swell in the thickness direction due to swelling of the battery cells 110, the vertical beam 1200 supports the side portions 210 and 220 of the battery module 100, Swelling can be controlled.

Hereinafter, with reference to FIGS. 15 to 17, etc., the positional relationship between the first flange portion 200F1 and the second flange portion 200F2 according to an embodiment of the present invention will be described in detail.

Figure 15 is an enlarged plan view of portion A of Figure 3.

Referring first to FIGS. 3, 13, and 15, as described above, the flange portions 200F are first flange portions 200F1 protruding from the first side portion 210 of the battery module 100 and the battery. It may include second flange parts 200F2 protruding from the second side part 220 of the module 100. At this time, based on the width direction between the first side portion 210 and the second side portion 220, the second flange portion is located in a portion corresponding to the midpoint M1 between the first flange portions 200F1. One of (200F2) may be located. In addition, based on the width direction between the first side portion 210 and the second side portion 220, the first flange portion ( 200F1) may be located. The width direction between the first side portion 210 and the second side portion 220 corresponds to a direction parallel to the y-axis in the drawing.

That is, the first flange parts 200F1 and the second flange parts 200F2 are arranged at regular intervals, but when viewed from the width direction, the first flange parts 200F1 and the second flange parts 200F2 ) do not overlap, and may be arranged misaligned with each other.

Additionally, the first flange portion 200F1 and the second flange portion 200F2 may have the same shape. 13 and 15 show that the first flange portion 200F1 and the second flange portion 200F2 have the same trapezoidal shape.

In this embodiment, by arranging the first flange parts 200F1 and the second flange parts 200F2 to be misaligned, when placing the plurality of battery modules 100, a minimum area is provided on one vertical beam 1200. It can be concluded. This will be explained in more detail along with the drawings.

Figure 16 is a front view showing a battery pack according to an embodiment of the present invention. Figure 17 is a plan view showing a battery pack according to an embodiment of the present invention. In particular, for convenience of explanation, FIG. 16 shows only one of the two battery modules 100-1 and 100-2 mounted on the pack housing 1100, and FIG. 17 shows two battery modules 100. -1, 100-2) are all shown mounted on the pack housing (1100).

Referring to Figure 13 and Figures 15 to 17 together, a plurality of battery modules 100 may be stored in the pack housing 1100. That is, the battery module 100 is composed of a plurality, and among the plurality of battery modules 100, the first battery module 100-1 and the second battery module 100-2 are located on the bottom of the pack housing 1100. (1100F). At this time, the flange portion 200F of the first battery module 100-1 and the flange portion 200F of the second battery module 100-2 are connected to the first battery module 100-1 and the second battery module. It can be fastened to one vertical beam 1200 located between (100-2).

More specifically, the first flange portion 200F1 protrudes from the first side portion 210 of the first battery module 100-1 and the second flange portion 200F1 protrudes from the second side portion 220 of the second battery module 100-2. The second flange portion 200F2 may be fastened to one vertical beam 1200 located between the first battery module 100-1 and the second battery module 100-2.

As described above, the fastening method may be one in which the bolt member 1300 passes through the mounting hole 200MH of the flange portion 200F and is fastened to the vertical beam 1200.

Looking at the first flange portion 200F1 of the first battery module 100-1 and the second flange portion 200F2 of the second battery module 100-2 fastened to one vertical beam 1200, Along the direction in which the vertical beam 1200 extends, the first flange portion 200F1 of the first battery module 100-1 and the second flange portion 200F2 of the second battery module 100-2 alternately can be located Here, the direction in which the vertical beam 1200 extends is the same as the direction in which the battery module 100 extends or the longitudinal direction of the battery cell, as described above, and may be a direction parallel to the x-axis in the drawing.

The first battery module 100-1 and the second battery module 100-2 are battery modules having the same structure. As described above, the first battery module 100-1 and the second battery module 100-2 are, based on the width direction between the first side portion 210 and the second side portion 220, the first battery module 100-1 and the second battery module 100-2. The flange portions 200F1 and the second flange portion 200F2 may have a structure in which they are arranged misaligned with each other without overlapping. According to this structure, the first flange portion 200F1 of the first battery module 100-1 and the second flange portion 200F2 of the second battery module 100-2 are fastened to one vertical beam 1200. are positioned alternately along the direction in which the vertical beam 1200 extends.

According to the above structure, it is possible to design the thickness of the vertical beam 1200 as thin as possible to correspond to the protruding length of one flange portion 200F. The first flange portion 200F1 of the first battery module 100-1 and the second flange portion 200F2 of the second battery module 100-2 are alternately arranged on one vertical beam 1200 to form one Since it is fastened to the upper surface of the vertical beam 1200, the thickness of the vertical beam 1200 can be minimized by the protruding length of the flange portion 200F. As such, in the battery pack 1000 according to this embodiment, by minimizing the thickness in the width direction of the vertical beam 1200, internal space utilization of the battery pack 1000 can be improved and capacity can be increased.

In addition, because the first flange portion 200F1 and the second flange portion 200F2 may have the same shape, the second battery may be installed in the space between the first flange portions 200F1 of the first battery module 100-1. The second flange portion 200F2 of the module 100-2 may fit, and the first battery module 100-1 may be placed in the space between the second flange portions 200F2 of the second battery module 100-2. The first flange portion 200F1 may fit.

That is, the first flange parts 200F1 of the first battery module 100-1 and the second flange parts 200F2 of the second battery module 100-2 form a gap on the upper surface of the vertical beam 1200. It can be fastened to the upper surface of the vertical beam 1200 in a close contact state so as not to form a shape.

In this way, the upper surface area of the vertical beam 1200 is maximized as a fastening area to minimize the thickness of the vertical beam 1200 because the first flange portions 200F1 and the second flange portions 200F2 are fastened to each other. However, the fixation accuracy can be increased by maximizing the fastening area.

Meanwhile, the flange portion 200F may be located closer to the upper surface portion 230 of the battery module 100 than the lower surface portion 240 of the battery module 100 in the height direction of the battery module 100. Here, the height direction of the battery module 100 is a direction perpendicular to one surface of the upper surface 230 or the lower surface 240 of the battery module 100 and corresponds to a direction parallel to the z-axis. That the flange portion 200F is located closer to the upper surface portion 230 than the lower surface portion 240 in the height direction means that the flange portion 200F is positioned higher than half the height of the battery module 100. . In FIG. 17 , the height h2 of the first flange portion 200F1 is shown to be higher than half the height h1 of the battery module 100.

In order to control the swelling of the battery cell 110, the vertical beam 1200 must cover the side parts 210 and 220 of the battery module 100 over a certain area, and accordingly, the vertical beam 1200 must also cover the side parts 210 and 220 of the battery module 100 at a certain level. Must have height. For effective support, the height of the vertical beam 1200 may be formed to be higher than half the height of the battery module 100, and the flange portion 200F fastened to the upper surface of the vertical beam 1200 naturally supports the battery module 100. It can be located higher than half the height of.

Hereinafter, various shapes of the flange portion according to various embodiments of the present invention will be described with reference to FIG. 18.

Figures 18 (a), (b), and (c) are partial views showing various shapes of the flange portion according to various embodiments of the present invention.

Referring to (a), (b), and (c) of Figure 18, the flange portions (200Fa, 200Fb, 200Fc) according to the present embodiments have a mounting hole (200MH) formed so that they can be fastened to the vertical beam. If possible, there are no particular restrictions on its shape. For example, the flange portions 200Fa, 200Fb, and 200Fc according to the present embodiments may have a trapezoidal, triangular, or square shape. In Figure 18 (a), a flange part 200Fa having a trapezoidal shape is shown, in Figure 18 (b) a triangular flange part 200Fb is shown, and in Figure 18 (c) a rectangular plan is shown. Branch 200Fc is shown.

However, as described above, in order to minimize the thickness of the vertical beam 1200 and maximize the area of the upper surface of the vertical beam 1200 as a fastening area, it is preferable that the first flange portion and the second flange portion have the same shape. .

In this embodiment, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer. .

One or more battery modules according to this embodiment described above may be mounted together with various control and protection systems such as a Battery Management System (BMS), Battery Disconnect Unit (BDU), and a cooling system to form a battery pack.

The battery pack can be applied to various devices. Specifically, it can be applied to transportation such as electric bicycles, electric vehicles, and hybrids, or ESS (Energy Storage System), but is not limited to this and can be applied to various devices that can use secondary batteries.

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 are also possible. falls within the scope of rights.

100: battery module
100-1: first battery module
100-2: Second battery module
110: battery cell
120: Battery cell laminate
200: module frame
210: first side portion
220: second side portion
230: upper surface
240: lower part
200F: Flange part
200F1: First flange portion
200F2: Second flange part
200MH: Mounting hole
1000: Battery pack
1100: pack housing
1100F: Bottom
1200: vertical beam

Claims (15)

A battery module including a plurality of battery cells;
a pack housing that stores the battery module; and
A plurality of vertical beams disposed on the bottom of the pack housing so as to be perpendicular to one surface of the bottom of the pack housing,
The battery module is disposed between the vertical beams,
A battery pack in which flange portions protruding from a side portion of the battery module are fastened to the vertical beam. In paragraph 1:
The flange portion is a plate-shaped member protruding in a direction perpendicular to one surface of the side portion of the battery module,
A mounting hole is formed in the flange portion,
A battery pack in which a bolt member passes through the mounting hole and is fastened to the vertical beam. In paragraph 2,
A fastening hole with a screw thread is formed on the upper surface of the vertical beam,
A battery pack in which the bolt member passes through the mounting hole and is fastened to the fastening hole of the vertical beam. In paragraph 1:
The battery module includes a battery cell stack in which the battery cells are stacked; And a module frame in which the battery cell stack is stored,
A battery pack in which the flange portions are formed on the side surfaces of the module frame. In paragraph 4,
The battery cell is a pouch cell,
A battery pack in which the battery cells are stacked within the battery cell stack, with one side of the battery cells standing upright parallel to the side portion of the module frame. In paragraph 1:
The flange portions include first flange portions protruding from a first side portion of the battery module and second flange portions protruding from a second side portion of the battery module. In paragraph 6:
A battery pack in which one of the second flange parts is located at a portion corresponding to a midpoint between the first flange parts, based on the width direction between the first side part and the second side part. In paragraph 6:
A battery pack in which one of the first flange parts is located at a portion corresponding to a midpoint between the second flange parts, based on the width direction that is the direction between the first side part and the second side part. In paragraph 6:
The first flange portion and the second flange portion have the same shape. In paragraph 9:
The first flange portion and the second flange portion have a trapezoidal, triangular, or square shape. In paragraph 1:
The battery module is composed of a plurality of battery modules, and a first battery module and a second battery module among the plurality of battery modules are disposed on the bottom of the pack housing,
A battery pack in which the flange portion of the first battery module and the flange portion of the second battery module are fastened to one of the vertical beams located between the first battery module and the second battery module. In paragraph 11:
The flange portions include first flange portions protruding from a first side portion of the battery module and second flange portions protruding from a second side portion of the battery module,
The first flange portion protruding from the first side portion of the first battery module and the second flange portion protruding from the second side portion of the second battery module are between the first battery module and the second battery module. is fastened to one of the vertical beams located at,
A battery pack in which the first flange portion of the first battery module and the second flange portion of the second battery module are alternately positioned along the direction in which the vertical beam extends. In paragraph 12:
The second flange part of the second battery module fits into the space between the first flange parts of the first battery module,
A battery pack in which the first flange part of the first battery module fits into the space between the second flange parts of the second battery module. In paragraph 1:
The flange portion is located closer to the upper surface of the battery module than the lower surface of the battery module in the height direction of the battery module. A device comprising the battery pack according to claim 1.