Battery pack and energy storage apparatus

Abstract

A battery pack according to an embodiment of the present invention comprises: a cell module assembly including a battery cell stack in which multiple battery cells are stacked; a pack case for accommodating the cell module assembly; and an outer cover for covering at least one surface of the pack case, wherein the pack case includes a magnet, and the outer cover is magnetically coupled to the magnet included in the pack case.

Description

Battery packs and energy storage devices

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

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0095856, filed July 19, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and an energy storage device, and more particularly, to a battery pack and an energy storage device capable of more easily combining an outer cover that covers the outer surface of a pack case that houses a cell module assembly.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has led to active development of related technologies. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution issues caused by conventional gasoline-powered vehicles, further fueling the growing need for secondary battery development.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0006] These secondary batteries are widely used not only in small devices like portable electronic devices, but also in medium- to large-sized devices like electric vehicles and power storage systems, and their use is rapidly increasing. Furthermore, the use of residential battery packs for power storage has been on the rise recently.

[0007] Meanwhile, a simpler method is needed to join the outer surface of the pack case housing the cell module assembly to the outer cover.

[0008] The present invention aims to provide a battery pack and energy storage device in which an outer cover covering the outer surface of a pack case housing a cell module assembly can be more easily combined.

[0009] 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.

[0010] A battery pack according to one embodiment of the present invention comprises: a cell module assembly including a battery cell stack in which a plurality of battery cells are stacked; a pack case for accommodating the cell module assembly; and an outer cover covering at least one surface of the pack case, wherein the pack case includes a magnet, and the outer cover can be magnetically coupled to the magnet provided in the pack case.

[0011] The pack case includes an outer cover coupling portion in which the magnet is received so as to be coupled with the outer cover, and the outer cover coupling portion includes a magnet receiving portion in which the magnet is mounted, and the magnetic force of the magnet is transmitted to the front surface of the magnet receiving portion so that the outer cover can be attached.

[0012] The above outer cover coupling part further includes a first magnet support part provided in front of the magnet receiving part, and the front surface of the magnet is supported by the first magnet support part, and an insulating distance between the magnet and the outer cover can be secured.

[0013] The first magnet support includes an opening, and the magnetic force of the magnet is transmitted to the outer cover through the opening of the first magnet support, and the front surface of the magnet can be supported by the remaining portion of the first magnet support except for the opening.

[0014] The size of the opening of the first magnet support may be smaller than the size of the large area of ​​the magnet.

[0015] The above outer cover coupling part further includes a second magnet support part provided at the rear of the magnet receiving part, and the rear surface of the magnet can be supported by the second magnet support part.

[0016] The magnet receiving portion has a first separation space in front of the second magnet support portion and a second separation space in the rear of the second magnet support portion, with the magnet being inserted into the first separation space, and when the magnet is inserted, the second magnet support portion can tilt toward the second separation space and then return again.

[0017] In order to prevent the magnet mounted on the magnet receiving portion from being detached, the second magnet support portion may include a catch portion having a protruding shape.

[0018] The magnet can be mounted in the magnet receiving portion in a hook-joining manner by the hooking portion.

[0019] The above outer cover coupling portion may further include a magnet insertion port having an open shape so that the magnet is inserted into the magnet receiving portion.

[0020] The above magnet insertion port can be provided perpendicular to the front surface of the magnet receiving portion.

[0021] At the edge where the two sides of the pack case meet, a plurality of outer cover coupling portions are provided, and a magnetic inlet of one of the plurality of outer cover coupling portions faces the upper part of the battery pack, and a magnetic inlet of another of the plurality of outer cover coupling portions faces the lower part of the battery pack, but the front surfaces of both magnet receiving portions can face the same direction.

[0022] At the edge where the two sides of the pack case meet, a plurality of outer cover coupling portions are provided, and two of the magnet insertion ports among the plurality of outer cover coupling portions each face the side of the battery pack, and the front surfaces of the magnet receiving portions can both face the same direction.

[0023] The above magnet can be mounted so that its large surface area faces the front of the magnet receiving portion.

[0024] The above outer cover may include a ferromagnetic metal.

[0025] The metal of the above ferromagnetic body may be made of any one of iron, nickel, cobalt, stainless steel, or an alloy or mixture thereof.

[0026] The above outer cover can cover at least the front and both sides of the pack case.

[0027] The above pack case can be made of plastic having high heat resistance and rigidity.

[0028] An energy storage device including a battery pack according to the embodiments described above can be provided.

[0029] According to the present invention, in a battery pack and an energy storage device, an outer cover covering an outer surface of a pack case that houses a cell module assembly can be more easily combined.

[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] Figure 1 is a perspective view of a battery pack according to one embodiment of the present invention.

[0032] Figure 2 is an exploded perspective view of the battery pack of Figure 1.

[0033] Figure 3 is a perspective view of the cell module assembly of Figure 2.

[0034] Figure 4 is an exploded perspective view of the cell module assembly of Figure 2.

[0035] Figure 5 illustrates the outer cover separated from the pack case of the battery pack of Figure 1.

[0036] Figure 6 is a partially enlarged view of the pack case of Figure 5.

[0037] Fig. 7 is a reference drawing of Fig. 6, and illustrates a magnet being mounted on the outer cover joint of Fig. 6.

[0038] Figure 8 is an enlarged view of the outer cover joint, showing detailed components of the outer cover joint.

[0039] Fig. 9 is a reference drawing of Fig. 8, showing the dimensions of the outer cover joint.

[0040] Figure 10 is a reference drawing showing the first outer cover joint from various angles.

[0041] Figure 11 is a reference drawing showing the second outer cover joint from various angles.

[0042] Figure 12 is a reference drawing showing the third outer cover joint from various angles.

[0043] Figure 13 illustrates the outer cover joint and magnet of the battery pack of Figure 1 as a whole.

[0044] Fig. 14 is a modified embodiment of the magnet provided in the battery pack of Fig. 1.

[0045] Figure 15 is a diagram showing the daily use status of the battery pack of Figure 1.

[0046] 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 invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0047] 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.

[0048] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0049] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0050] 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.

[0051] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0052] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0053] Fig. 1 is a perspective view of a battery pack (1) according to one embodiment of the present invention. Fig. 2 is an exploded perspective view of the battery pack (1) of Fig. 1.

[0054] Referring to FIGS. 1 and 2, a battery pack (1) includes a cell module assembly (CMA) 100, a pack case (200) that houses the cell module assembly (100) therein, and an outer cover (300) that covers at least a portion of an outer surface of the pack case (200). In the embodiments of FIGS. 1 and 2, an embodiment is shown in which the outer cover (300) covers the front surface and both side surfaces of the pack case (200). However, the present invention is not limited thereto, and may be implemented by modifying and changing it in various ways, such as covering all surfaces of the pack case (200) or covering the four surfaces of the front, rear, left and right sides of the pack case (200).

[0055] In addition, in some cases, the battery pack (1) may additionally include a power unit (400). The power unit (400) collects and transmits data sensed by the cell module assembly (100) and controls the cell module assembly (100). A description of the power unit (400) refers to a typical BMS, etc., and a detailed description is omitted.

[0056] The cell module assembly (100) is stored in a space inside the pack case (200). When a power unit (400) is provided, the power unit (400) can also be stored inside the pack case (200) together with the cell module assembly (100).

[0057] FIG. 3 is a perspective view of the cell module assembly (100) of FIG. 2, and FIG. 4 is an exploded perspective view of the cell module assembly (100) of FIG. 2.

[0058] The cell module assembly (100) may include one or more battery cells (110). Here, each battery cell (110) may be a secondary battery and include an electrode assembly, an electrolyte, and a battery case. The battery cell (110) included in the cell module assembly (100) may be, for example, a pouch-type secondary battery. Alternatively, depending on the case, other forms of secondary batteries, such as cylindrical batteries or square batteries, may also be employed in the cell module assembly (100) of the present invention.

[0059] A plurality of battery cells (110) are stacked on each other to form a battery cell stack. In the battery cell stack, the plurality of battery cells (110) may be stacked in a horizontal direction (X-axis direction of the drawing) while standing upright in the vertical direction (Z-axis direction of the drawing). Each battery cell (110) may have an electrode lead, and the electrode lead may be located at both ends of each battery cell (110) or at one end. A secondary battery in which the electrode lead protrudes in both directions is called a bidirectional cell, and a secondary battery in which the electrode lead protrudes in one direction is called a unidirectional cell. A bidirectional cell is illustrated in FIG. 3. However, the present invention is not limited by a specific type or form of the secondary battery, and various forms of secondary batteries known at the time of filing of the present invention may be employed in the cell module assembly (100) of the present invention.

[0060] Referring to the embodiments of FIGS. 3 and 4, the cell module assembly (100) can be exemplarily configured as follows. End plates (120) are placed on both sides of a battery cell stack in which a plurality of battery cells (110) are stacked. The battery cell stack and the end plates (120) are connected with straps (130). In addition, a busbar housing assembly (140) is connected to the front and rear sides of the battery cell stack, respectively. However, the present invention is not limited to the above, and the cell module assembly (100) can be configured in various ways according to the specifications of the battery pack (1) according to the present invention and the environment in which the present invention is implemented.

[0061] FIG. 5 illustrates the outer cover (300) separated from the pack case (200) of the battery pack (1) of FIG. 1.

[0062] Referring to FIGS. 1, 2, and 5, the pack case (200) may be configured to have an empty space formed therein to accommodate a cell module assembly (100, see FIG. 2) in the internal space. For example, the pack case (200) may be configured in a box shape as illustrated in FIG. 1.

[0063] The pack case (200) may be composed of an upper case (200-1) covering the front and rear, left and right sides, and the upper surface of the cell module assembly (100), and a lower case (200-2) covering the lower surface of the cell module assembly (100), as illustrated in FIG. 2. However, with respect to the structure and shape of the pack case (200), the present invention is not limited to that illustrated in FIG. 2, and it is sufficient that the cell module assembly (100) is accommodated therein, and at least a portion of the outer surface of the pack case (200) can be covered by being combined with an outer cover (300). The structure and shape of the case may be variously modified and changed to suit the specifications of the present invention, the environment to be implemented, etc.

[0064] The pack case (200) can be manufactured from a plastic having high heat resistance and rigidity. In this case, compared to manufacturing the pack case (200) from metal, manufacturing the pack case (200) is easier and manufacturing costs can be reduced. In other words, the structure and shape of the outer surface of the pack case (200) and the structure and shape of the inner surface can be manufactured in various ways to suit the specifications or design requirements of the battery pack (1).

[0065] For example, in the example of FIG. 5, the pack case (200) may include an outer cover coupling portion (210, see FIG. 6) for coupling the outer cover (300). In addition, it may also include a handle (220) for moving the battery pack (1). In addition, the outer surface of the pack case (200) may additionally include a reinforcing portion (230) having a grid-like protrusion shape as shown in FIGS. 2 and 5 to reinforce rigidity. When the pack case (200) including these components is made of plastic having high heat resistance and rigidity, the manufacture of the pack case (200) is easier. In addition, the manufacture of the storage space for the cell module assembly (100) and / or the electric unit (400), which is the internal storage space of the pack case (200), is also easier.

[0066] In addition, in terms of manufacturing cost, the cost can be reduced when the pack case (200) is manufactured from plastic with high heat resistance and rigidity rather than when the entire pack case (200) is manufactured from metal.

[0067] Meanwhile, according to an embodiment of the present invention, while manufacturing the pack case (200) with a plastic having high heat resistance and rigidity, at least a portion of the outer surface of the pack case (200) is covered with an outer cover (300) as described below, thereby functionally protecting and reinforcing the battery pack (1), while additionally providing an aesthetic function to the exterior of the battery pack (1).

[0068] The outer cover (300) covers at least a portion of the outer surface of the pack case (200). In the embodiment of FIG. 2, the outer cover (300) is exemplarily shown to cover the front and left and right sides of the pack case (200). Which of the six sides of the front and back, left and right sides, and top and bottom of the pack case (200) the outer cover (300) covers can be variously modified and changed to suit the specifications of the present invention, the environment to be implemented, etc.

[0069] The outer cover (300) may be made of a metal material so as to maintain rigidity even during thermal events. Furthermore, as described below, the outer cover (300) may be made of a ferromagnetic material so as to be magnetically coupled to a magnet (500) provided in the pack case (200). The outer cover (300) may be made of, for example, iron, nickel, cobalt, stainless steel, or an alloy or mixture thereof.

[0070] However, the present invention is not limited to the above-described material, and the material of the outer cover (300) may be appropriately selected to suit the environment in which the present invention is implemented, without being limited to the above-described material. For example, the outer cover (300) may be made of metal, although it is not a ferromagnetic substance, or in some cases, may be made of high-strength plastic, and various modifications and changes are possible. In this case, as described below, a ferromagnetic metal or magnet (not shown) may be additionally attached to the outer cover (300) so that the outer cover (300) can be magnetically attached to a magnet (500) provided in the pack case (200).

[0071] In detail, the outer cover (300) itself may be made entirely of ferromagnetic metal and may be attached to the magnet (500) provided in the pack case (200), but the outer cover (300) may additionally be provided with ferromagnetic metal or a magnet and may be attached to the magnet (500) provided in the pack case (200).

[0072] Fig. 6 is a partial enlarged view of the pack case (200) of Fig. 5. Fig. 7 is a reference drawing of Fig. 6, and illustrates a magnet (500) being mounted on the outer cover joint (210) of Fig. 6.

[0073] First, the external cover (300) is attached and bonded to the outer surface of the pack case (200) by the magnetic force between the magnet (500) stored in the external cover joint (210) of the pack case (200) and the external cover (300) made of ferromagnetic metal.

[0074] Referring to FIGS. 6 and 7, the magnet insertion port (211, see FIG. 8) of the first outer cover coupling part (210-1) is provided on the upper surface of the battery pack (1), the magnet insertion port (211) of the second outer cover coupling part (210-2) is provided on the lower surface of the battery pack (1), and the magnet insertion ports (211) of each of the third outer cover coupling part (210-3) and the fourth outer cover coupling part (210-4) are provided on the side surface of the battery pack (1).

[0075] In detail, since the magnet input port (211) of the first outer cover coupling part (210-1) is provided on the upper surface of the battery pack (1), the magnet input port (211) is formed facing upward. Accordingly, the magnet (500) is inserted into the first outer cover coupling part (210-1) from the upper side. In addition, since the magnet input port (211) of the second outer cover coupling part (210-2) is provided on the lower surface of the battery pack (1), the magnet input port (211) is formed facing downward. Accordingly, the magnet (500) is inserted into the second outer cover coupling part (210-2) from the lower side.

[0076] More specifically, a plurality of outer cover coupling portions (210) are provided at the edges where two sides of the pack case (200) meet, and the magnet insertion port (211) of the first outer cover coupling portion (210-1) faces the upper portion of the battery pack (1), and the magnet insertion port (211) of the second outer cover coupling portion (210-2) faces the lower portion of the battery pack (1), but the front surfaces of the magnet receiving portions (S) of the first outer cover coupling portion (210-1) and the second outer cover coupling portion (210-2) both face the same direction. Accordingly, the same outer cover (300; 310) is attached to the first outer cover coupling portion (210-1) and the second outer cover coupling portion (210-2).

[0077] Likewise, since the magnet insertion ports (211) of the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4) are provided on the side of the battery pack (1), the magnet insertion ports (211) are formed toward the side. Accordingly, the magnets (500) are inserted into the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4) from the side, respectively.

[0078] Additionally, the front surfaces of the magnet receiving portions (S) of the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4) both face the same direction. Accordingly, the same outer covers (300; 320) are attached to the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4).

[0079] Meanwhile, for convenience of explanation, the magnet insertion port (211) is classified according to which direction it is located among the top, bottom, and side of the battery pack (1) (i.e., the direction in which the magnet insertion port (211) faces), but the detailed components of the first outer cover joining portion (210-1), the second outer cover joining portion (210-2), the third outer cover joining portion (210-3), and the fourth outer cover joining portion (210-4) are all the same.

[0080] As illustrated in FIGS. 6 and 7, it is advantageous for the outer cover coupling portion (210) to be formed at the edge of the pack case (200) (i.e., the edge where the first and second surfaces of the pack case (200) meet). Accordingly, it is easy to insert the magnet (500) into the magnet insertion port (211) of the outer cover coupling portion (210). However, the present invention is not limited to what is illustrated, and the outer cover coupling portion (210) may be provided at various locations to suit various specifications (structures) of the battery pack (1).

[0081] In addition, the direction in which the magnet insertion port (211) of the outer cover coupling portion (210) faces is not limited to that shown, and can be variously modified and changed to suit the specifications (size, shape, etc.) of the battery pack (1) according to the present invention. The number, position, size, etc. of the outer cover coupling portion (210) are also not limited to that shown, and can be variously modified and changed to suit the specifications (size, shape, etc.) of the battery pack (1) and the environment in which the battery pack (1) of the present invention is implemented.

[0082] Fig. 8 is an enlarged view of the outer cover joint (210), showing detailed components of the outer cover joint (210). Fig. 9 is a reference drawing of Fig. 8, showing the dimensions of the outer cover joint (210).

[0083] Referring to FIG. 8, among the external cover connecting parts (210), the first external cover connecting part (210-1) is representatively (illustratively) illustrated.

[0084] First, as described above, in the first outer cover coupling portion (210-1), the second outer cover coupling portion (210-2), the third outer cover coupling portion (210-3), and the fourth outer cover coupling portion (210-4), the detailed components are all the same except that the direction in which the magnet insertion port (211) faces is different. Therefore, the description of the detailed components of the outer cover coupling portion (210) using the first outer cover coupling portion (210-1) as an example applies equally to the second outer cover coupling portion (210-2), the third outer cover coupling portion (210-3), and the fourth outer cover coupling portion (210-4).

[0085] The detailed components of the outer cover joint (210) are as follows. The magnet insertion port (211) has an open shape so that a magnet (500) can be inserted.

[0086] A magnet (500) inserted into a magnet inlet (211) is mounted in a magnet receiving portion (S). The magnetic force of the magnet (500) is transmitted to the front surface of the magnet receiving portion (S), and the outer cover (300) is attached. The front surface of the magnet receiving portion (S) may be partially open, or the thickness of the front surface of the magnet receiving portion (S) may be thin enough to transmit the magnetic force. In the embodiment of the present invention, a case where the former case is implemented will be exemplarily described. A first magnet support portion (212) is provided in front of the magnet receiving portion (S), and a second magnet support portion (213) is provided in the rear of the magnet receiving portion (S). In addition, a magnet input portion (211) may be provided perpendicular to the front surface (front) of the magnet receiving portion (S).

[0087] The front surface of the magnet (500) mounted on the magnet receiving portion (S) is supported by the first magnet support portion (212). The first magnet support portion (212) includes an opening (212a) so that the magnetic force of the magnet (500) is transmitted to the outer cover (300). The size of the opening (212a) of the first magnet support portion (212) is smaller than the size of the large area of ​​the magnet (500). In addition, the thickness (D) of the first magnet support portion (212)t , see Fig. 9) can secure an insulating distance between the magnet (500) and the outer cover (300).

[0088] The rear surface of the magnet (500) mounted on the magnet receiving portion (S) may further include a second magnet support portion (213) having a protruding shape to prevent the magnet (500) mounted on the magnet receiving portion (S) from being detached. The upper surface of the magnet (500) mounted on the magnet receiving portion (S) may be caught by the catch portion (214) to prevent the magnet (500) from being detached. In other words, the magnet (500) may be mounted in the magnet receiving portion (S) in a hook-joint manner.

[0089] Referring to Fig. 9, the magnet insertion port (211) has a first separation space having a first separation distance (D1) in front of the second magnet support (213) with respect to the second magnet support (213), and a second separation space having a second separation distance (D2) in the rear of the second magnet support (213). A magnet (500) is inserted into the first separation space (a space formed by the first separation distance (D1) of the magnet insertion port (211). At this time, since the second magnet support (213) is provided with a catch (214) having a protrusion shape, it is generally difficult for the magnet (500) to be mounted into the magnet receiving portion (S) by the catch (214). However, according to the present invention, since the second separation space having the second separation distance (D2) is also provided at the rear of the second magnet support (213), when the magnet (500) introduced into the magnet receiving portion (S) passes the catch portion (214) of the second magnet support (213), the second magnet support (213) can be slightly tilted backward toward the second separation space. After the magnet (500) is mounted in the magnet receiving portion (S), the second magnet support (213) returns to its original state.

[0090] Accordingly, even though the magnet support member (213) has a catch member (214), the magnet (500) can be easily inserted into the magnet receiving member (S). On the other hand, once the magnet (500) is mounted in the magnet receiving member (S), it is prevented from being detached to the outside by the catch member (214) provided in the second magnet support member (213) as described above.

[0091] Fig. 10 is a reference drawing illustrating the first outer cover coupling part (210-1) from various angles. Fig. 11 is a reference drawing illustrating the second outer cover coupling part (210-2) from various angles. Fig. 12 is a reference drawing illustrating the third outer cover coupling part (210-3) from various angles. Fig. 13 is a general drawing of the outer cover coupling part (210) and the magnet (500) of the battery pack (1) of Fig. 1.

[0092] Referring to FIGS. 10, 11, and 13, as described above, the magnet input port (211) of the first outer cover coupling portion (210-1) is formed facing upward, and accordingly, the magnet (500) is input from the upper side into the first outer cover coupling portion (210-1). In addition, the magnet input port (211) of the second outer cover coupling portion (210-2) is formed facing downward, and accordingly, the magnet (500) is input from the lower side into the second outer cover coupling portion (210-2).

[0093] A total of four first outer cover connecting portions (210-1) and four second outer cover connecting portions (210-2) are provided on each edge (four corners, for example, in FIG. 13) of the front surface of the pack case (200).

[0094] At this time, in the first outer cover coupling portion (210-1) and the second outer cover coupling portion (210-2), the opening (212a) of the first magnet support portion (212) is provided on the front side of the battery pack (1), and the magnetic force of the magnet (500) is transmitted through the opening (212a) of the first magnet support portion (212), so that the outer cover (310) can be attached (magnetically coupled) to the front side of the battery pack (1).

[0095] In addition, referring to FIGS. 12 and 13, as described above, the magnet input port (211) of the third outer cover coupling portion (210-3) is formed toward the side, and accordingly, the magnet (500) is input into the third outer cover coupling portion (210-3) from the side. Refer to FIG. 12 for an example of the magnet (500) being input into the fourth outer cover coupling portion (210-4).

[0096] A total of four third outer cover connecting portions (210-3) and four fourth outer cover connecting portions (210-4) are provided on each edge of the side of the pack case (200) (both edges as an example in FIG. 13).

[0097] At this time, in the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4), the opening (212a) of the first magnet support portion (212) is provided on the side surface of the battery pack (1), and the magnetic force of the magnet (500) is transmitted through the opening (212a) of the first magnet support portion (212), so that the outer cover (320) can be attached (magnetically coupled) to one side surface of the battery pack (1). The same description applies to the outer cover (330) attached to the other side surface opposite to one side surface of the battery pack (1).

[0098] Meanwhile, in the present invention, the number, position, etc. of each of the first outer cover connecting portion (210-1), the second outer cover connecting portion (210-2), the third outer cover connecting portion (210-3), and the fourth outer cover connecting portion (210-4) are not limited to those illustrated in FIG. 13, and can be variously modified and changed to suit the specifications (size, shape, etc.) of the battery pack (1) and the environment in which the battery pack (1) of the present invention is implemented.

[0099] For example, when the size of the battery pack (1) is larger, the number of each outer cover connecting portion (210) may be increased beyond the number shown in FIG. 13. More specifically, for example, a first outer cover connecting portion (210-1) may be additionally provided along the upper edge of the front surface of the pack case (200), and similarly, a second outer cover connecting portion (210-2) may be additionally provided along the lower edge of the front surface of the pack case (200). Alternatively, when the size of the battery pack (1) is smaller, the number of each outer cover connecting portion (210) may be reduced beyond the number shown in FIG. 13, in some cases.

[0100] In addition, in FIG. 13, the opening (212a) of the first magnet support (212) of each of the first outer cover coupling portion (210-1) and the second outer cover coupling portion (210-2) faces the front of the battery pack (1), but in some cases, the opening (212a) of the first magnet support portion (212) may be configured to face the side of the battery pack (1). Similarly, in FIG. 13, the opening (212a) of the first magnet support portion (212) of each of the third outer cover coupling portion (210-3) and the fourth outer cover coupling portion (210-4) faces the side of the battery pack (1), but in some cases, the opening (212a) of the first magnet support portion (212) may be configured to face the front of the battery pack (1), and various modifications and changes are possible.

[0101] FIG. 14 is a modified embodiment of a magnet (500) provided in the battery pack (1) of FIG. 1. The magnet (500) may have a rectangular parallelepiped shape with chamfered (rounded or chamfered) corners, as illustrated in FIGS. 7 to 13. However, the magnet (500) may also have a rectangular parallelepiped shape, as illustrated in FIG. 14 (a), or a cylindrical (plate) shape, as illustrated in FIG. 14 (b), and any shape that can sufficiently transmit magnetic force to the outer cover (300) with a large surface area of ​​the magnet (500) toward the opening (212a) of the first magnet support (212) is sufficient, and is not limited to that illustrated in the present invention.

[0102] Fig. 15 is a diagram showing a state of use of the battery pack (1) of Fig. 1. The battery pack (1) of Fig. 1 may be used alone, but as illustrated in Fig. 14, a plurality of battery packs (1) may also be provided and used. It goes without saying that a plurality of battery packs (1) may be freely combined in series or parallel. Fig. 14 exemplarily illustrates a case where a plurality of battery packs (1) are stacked vertically to implement an energy storage device (ESS). A base (2) may be provided to protect the battery pack (1) from the ground, etc., and the battery pack (1) may be stacked on the base (2).

[0103] The battery pack according to the above-described embodiments of the present invention may be implemented as an energy storage system (ESS) as described above, may be implemented as a battery rack, and may be applied to various other devices. As such devices, they may be applied to means of transportation such as electric bicycles, electric vehicles, hybrid vehicles, and / or energy storage devices for homes. However, the present invention is not limited thereto, and may be applied to various devices that can use battery modules and battery packs including the same, which also fall within the scope of the present invention.

[0104] 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.

[0105] [Explanation of symbols]

[0106] 1: Battery pack

[0107] 2: Bass section

[0108] 100: Cell module assembly

[0109] 110: Battery cell

[0110] 120: End Plate

[0111] 130: Strap

[0112] 140: Busbar housing assembly

[0113] 200: Pack Case

[0114] 200-1: Upper case

[0115] 200-2: Lower case

[0116] 210: Outer cover joint

[0117] 211: Magnet input slot

[0118] 212: First magnet support

[0119] 212a: Front opening

[0120] 213: Second magnet support

[0121] 214: Hook

[0122] 220: Handle

[0123] 230: Reinforcement

[0124] 300: Outer cover

[0125] 400: Battlefield Unit

[0126] 500: Magnet

Claims

1. A cell module assembly including a battery cell stack in which a plurality of battery cells are stacked; A pack case for storing the above cell module assembly; and Including an outer cover covering at least one side of the pack case, The above pack case includes a magnet, A battery pack, wherein the outer cover is magnetically coupled to a magnet provided in the pack case.

2. In paragraph 1, The pack case includes an outer cover coupling portion in which the magnet is received to be coupled with the outer cover, The outer cover coupling part is a battery pack, wherein the outer cover is attached by including a magnet receiving part in which the magnet is mounted, and the magnetic force of the magnet is transmitted to the front surface of the magnet receiving part.

3. In paragraph 2. The above outer cover joint: Further comprising a first magnet support provided in front of the magnet receiving portion, A battery pack in which the front surface of the magnet is supported by the first magnet support member, and an insulating distance between the magnet and the outer cover is secured.

4. In paragraph 3, The first magnet support includes an opening, The magnetic force of the magnet is transmitted to the outer cover through the opening of the first magnet support, A battery pack in which the front surface of the magnet is supported by the remaining portion excluding the opening of the first magnet support portion.

5. In paragraph 4, A battery pack, wherein the size of the opening of the first magnet support is smaller than the size of the large area of ​​the magnet.

6. In paragraph 2, The above outer cover joint: Further comprising a second magnet support provided at the rear of the magnet receiving portion, A battery pack, wherein the rear surface of the magnet is supported by the second magnet support member.

7. In paragraph 6, The magnet receiving portion has a first space in front of the second magnet support portion and a second space in the rear of the second magnet support portion, based on the second magnet support portion. The magnet is inserted into the first separation space, A battery pack, wherein when the magnet is inserted, the second magnet support can tilt toward the second separation space and then return again.

8. In paragraph 6, A battery pack, wherein the second magnet support portion includes a catch portion having a protruding shape to prevent the magnet mounted on the magnet receiving portion from being detached.

9. In paragraph 8, A battery pack, wherein the magnet is mounted in the magnet receiving portion in a hook-joining manner by the hooking portion.

10. In paragraph 2, The above outer cover joint: A battery pack further comprising a magnet insertion port having an open shape so that the magnet is inserted into the magnet receiving portion.

11. In paragraph 10, A battery pack in which the magnet insertion port is provided perpendicular to the front surface of the magnet receiving portion.

12. In paragraph 10, At the edge where the two sides of the above pack case meet, a plurality of outer cover joining portions are provided, A battery pack, wherein one of the plurality of outer cover coupling portions has a magnetic inlet facing the upper portion of the battery pack, and the other of the plurality of outer cover coupling portions has a magnetic inlet facing the lower portion of the battery pack, and the front surfaces of both magnet receiving portions face the same direction.

13. In paragraph 10, At the edge where the two sides of the above pack case meet, a plurality of outer cover joining portions are provided, A battery pack, wherein two of the plurality of outer cover joints each face a side of the battery pack, and the front surfaces of the magnet receiving portions both face the same direction.

14. In paragraph 2, A battery pack in which the magnet is mounted so that its large surface area faces the front of the magnet receiving portion.

15. In paragraph 1, A battery pack, wherein the outer cover comprises a ferromagnetic metal.

16. In paragraph 15, A battery pack, wherein the metal of the above ferromagnetic body is made of iron, nickel, cobalt, stainless steel, or any one of an alloy or mixture thereof.

17. In paragraph 1, A battery pack, wherein the outer cover covers at least the front and both sides of the pack case.

18. In paragraph 1, A battery pack, wherein the pack case comprises plastic having high heat resistance and rigidity.

19. An energy storage device comprising a battery pack according to paragraph 1.

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