Battery Pack with Excellent Impact Resistance

Abstract

The present invention relates to a battery pack having excellent impact resistance, and specifically, to a battery pack including a frame portion including a rectangular outer frame forming a housing space and a support frame positioned along the longitudinal direction inside one side edge of the outer frame, a battery cell housed in the housing space, a BMU having one surface facing the upper surface of the support frame and electrically connected to the battery cell, and a BMU cover having a cover plate positioned on the other surface of the BMU, wherein the frame portion is composed of a first mounting portion and a second mounting portion thicker than the first mounting portion.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0018619, filed on February 13, 2023, and all the contents disclosed in the Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery module having excellent impact resistance, and more particularly, to a battery module having excellent impact resistance that can minimize damage to a BMU by preventing a battery pack from being bent by an external force.

Background Art

[0003] Recently, due to air pollution caused by the use of fossil fuels and energy depletion, there has been an increasing demand for secondary batteries that can store electrical energy produced by the development of alternative energy. Rechargeable secondary batteries are closely used in daily life such as mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Secondary batteries used as an energy source for various electronic devices that are essential in modern society have an increasing required capacity due to the increasing use and complexity of mobile devices and the development of electric vehicles and the like. To meet the needs of users, a large number of battery cells are arranged in small devices, but battery modules that electrically connect a large number of battery cells or battery packs having a large number of such battery modules are used in vehicles and the like.

[0005] On the other hand, when the device is a tablet PC, a movable slim TV, or a notebook PC used for portable use, weight reduction is also important, but it must be resistant to impact.

[0006] FIG. 1 is an exploded perspective view of a battery pack according to the prior art. As shown in FIG. 1, the battery pack includes a battery cell 20, a protection circuit module 30 electrically connected to an electrode tab extending from the battery cell, a protection circuit module cover 50, a frame 10 having a cell accommodation portion formed therein for accommodating the battery cell, and a first pressing rib 40 protruding from the frame 10 in a direction opposite to the cell accommodation portion and pressing the electrode tab and the protection circuit module toward each other.

[0007] However, in the case of the battery pack according to the prior art, since a plurality of battery cells are arranged side by side in a rectangular structure, it is a structure that is easily bent by an external force in the longitudinal direction.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] An object of the present invention for solving the above problems is to provide a battery pack having excellent impact resistance that can prevent damage to a battery management unit that may occur when the battery pack is bent by an external force such as an external impact.

[0010] Another object of the present invention is to provide a battery pack that facilitates the assembly of the battery pack and can improve the welding quality.

Means for Solving the Problems

[0011] To achieve the above object, a battery pack according to the present invention includes a rectangular outer frame (110) forming an accommodation space (S), and a frame part (100) including a support frame (120) longitudinally positioned inside one side edge of the outer frame (110), a battery cell (200) accommodated in the accommodation space (S), a BMU (300) having one surface facing the upper surface of the support frame (120) and electrically connected to the battery cell (200), and a BMU cover (400) having a cover plate (410) positioned on the other surface of the BMU (300). The frame part (100) further includes one or more first ribs (140) having one side connected to the outer frame (110) and extending along the width direction, and a second rib (150) having a double rib structure positioned along a longitudinal edge of the support frame (120) and connected to the other side of the first rib (140).

[0012] Also, in the battery pack of the present invention, the support frame (120) is characterized by being composed of a first mounting part (121) and a second mounting part (122) thicker than the first mounting part (121).

[0013] Also, in the battery pack of the present invention, a first opening (121a) is formed in the first mounting part (121), and terminals of the battery cell (200) are mounted therein.

[0014] Also, in the battery pack of the present invention, a printed circuit board (310) of the BMU (300) is mounted in the second mounting part (122).

[0015] Also, in the battery pack of the present invention, a plurality of accommodation parts (130) are provided on the upper surface of the support frame (120) along the longitudinal direction and / or the width direction, and a plurality of insertion parts (430) introduced into the accommodation parts are provided on the cover plate (410).

[0016] Further, in the battery pack of the present invention, the accommodating portion (130) is provided at one side edge portion in the width direction of the support frame (120), is located at a predetermined distance from the inner surface of the outer frame (110) having a predetermined height, and includes a first accommodating plate (131a) having a first fastening hole (131a'), and a first connecting portion (131b) connecting the first accommodating plate (131a) and the outer frame (110), and is a first accommodating portion (131). The inserting portion (430) includes a first inserting plate (431a) extending vertically from one side edge portion in the width direction of the cover plate (410), and a first hook (431b) formed on the inner surface of the first inserting plate (431a) and fastened to the first fastening hole (131a').

[0017] Further, in the battery pack of the present invention, the accommodating portion (130) is provided at one side edge portion in the longitudinal direction of the support frame (120), is located at a predetermined distance from the inner surface of the outer frame (110) having a predetermined height, and includes a second accommodating plate (132a) having a second fastening hole (132a'), and a pair of second connecting portions (132b) connecting the second accommodating plate (132a) and the outer frame (110), and is a second accommodating portion (132). The inserting portion (430) includes a second inserting plate (432a) extending vertically from the edge portion of the cover plate (410), and a second hook (432b) formed on the inner surface of the second inserting plate (432a) and fastened to the second fastening hole (132a').

[0018] Also, in the battery pack of the present invention, the housing part (130) is provided at the other side edge in the width direction of the support frame (120), is positioned at a predetermined distance from the inner surface of the outer frame (110) having a predetermined height, and includes a third housing plate (133a) provided with a third fastening hole (133a'), and a third connecting part (133b) that connects the third housing plate (133a) and the outer frame (110). The third housing part (133) includes the third insertion part (433) including a third insertion plate (433a) extending vertically from the other side edge in the width direction of the cover plate (410), and a third hook (433b) formed on the inner surface of the third insertion plate (433a) and fastened to the third fastening hole (133a').

[0019] Also, in the battery pack of the present invention, the second rib (150) is characterized by having a lattice structure.

[0020] Also, in the battery pack of the present invention, third ribs (420) are provided along the width direction and / or the longitudinal direction on the inner surface of the cover plate (410) facing the other surface of the BMU (300).

[0021] Also, in the battery pack of the present invention, one or more second openings (411) are formed in the cover plate (410).

Advantages of the Invention

[0022] As described above, according to the battery pack with excellent impact resistance according to the present invention, the support frame where the electrode terminal, BMU, and BMU cover are located has a thickness deviation, so that it is possible to suppress an increase in the thickness of the battery pack while minimizing the phenomenon of bending in the longitudinal direction and the width direction.

[0023] `Moreover, according to the battery pack with excellent impact resistance according to the present invention, since the support frame includes a large number of accommodating portions along the longitudinal direction and the width direction, and the BMU cover includes insertion portions to be inserted into the respective accommodating portions, there is an advantage that the BMU can be protected from external impacts and bending phenomena.

[0024] Also, according to the battery pack with excellent impact resistance according to the present invention, since the second ribs of the lattice structure are located at positions spaced apart from each other by a predetermined interval in the respective accommodating portions and facing each other, there is an advantage that the phenomenon of bending around the interface of the battery cells that are vulnerable to bending deformation in the longitudinal direction can be minimized.

[0025] Furthermore, according to the battery pack with excellent impact resistance according to the present invention, since the BMU cover includes a large number of second openings, there is an advantage that the heat dissipation effect can be improved without interfering with the elements mounted on the printed circuit board.

Brief Description of the Drawings

[0026]

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Embodiments for Carrying Out the Invention

[0027] Hereinafter, based on the accompanying drawings, embodiments that enable a person having ordinary knowledge in the technical field to which the present invention pertains to easily implement the present invention will be described in detail. However, when explaining in detail the operating principle of a preferred embodiment of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0028] Also, the same reference numerals are used for parts having similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only the case where they are directly connected but also the case where they are indirectly connected with other elements interposed therebetween. Also, including a certain component means, unless otherwise specified to the contrary, not excluding other components and further including other components.

[0029] Also, the X-axis direction shown in the drawings is defined as the longitudinal direction, the Y-axis direction is defined as the width direction, and the Z-axis direction is defined as the height direction.

[0030] Also, when the Z-axis direction is taken as a reference, one surface and the other surface are surfaces facing each other, and when the X-axis direction or the Y-axis direction is taken as a reference, one side surface and the other side surface mean side surfaces facing each other.

[0031] Hereinafter, a battery pack with excellent impact resistance according to the present invention will be described with reference to the accompanying drawings.

[0032] The battery pack of the present invention can be mounted on a tablet PC, a notebook PC, or a slim-type TV, and is preferably mounted on a tablet PC, but is not necessarily limited thereto.

[0033] FIG. 2 is a perspective view of the battery pack according to a preferred embodiment of the present invention viewed in one direction, FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2, and FIG. 4 is a perspective view of a battery cell constituting the battery pack of the present invention.

[0034] As shown in FIGS. 2 to 4, the battery pack according to the present invention may include a frame portion 100, a plurality of battery cells 200 housed in the frame portion 100, a BMU 300 electrically connected to the battery cells 200, a BMU cover 400 for protecting the BMU 300, a first packaging member 500 located on one surface of the frame portion 100, and a second packaging member 600 located on the other surface of the frame portion 100.

[0035] The frame portion 100 is configured to house and fix the battery cells 200, the BMU 300, and the BMU cover 400 and protect them from external impacts. The overall outer shape is substantially square, and a detailed description thereof will be given later.

[0036] The battery cell 200 housed in the frame portion 100 is preferably a pouch-type battery cell. Such a pouch-type battery cell may include a cell case 210, an electrode assembly (not shown) housed in the cell case 210, and a pair of electrode terminals 220, one side of which is connected to a tab bundle of the electrode assembly and the other side of which is positioned to protrude outside the cell case 210.

[0037] Here, the cell case 210 is composed of a first case and a second case, and a pocket-shaped accommodating portion is formed in one or more of the first case and the second case so that an electrode assembly (not shown) can be accommodated. Such a cell case 210 forms the accommodating portion using a laminate sheet composed of an outer resin layer, a metal layer, and an inner resin layer.

[0038] The outer resin layer is located on the outermost contour of the cell case 210, and a heat-resistant polymer excellent in tensile strength, moisture permeability prevention, and air permeability prevention can be used so as to ensure heat resistance and chemical resistance while protecting the electrode assembly. As an example, nylon or polyethylene terephthalate can be used, but it is not limited thereto.

[0039] The metal layer in contact with the outer resin layer corresponds to a barrier layer that prevents moisture and various gases from penetrating into the battery from the outside. As a suitable material for such a metal layer, an aluminum thin film that is light and has excellent moldability can be used.

[0040] And since the inner resin layer is in direct contact with the electrode assembly, it must have insulating properties and electrolytic resistance. Also, for sealing with the outside, that is, the sealing portion where the inner layers are thermally adhered to each other must have excellent thermal adhesion strength. As a material for such an inner resin layer, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which are excellent in chemical resistance and have good sealing properties, can be selected, but it is not limited thereto. Polypropylene, which is excellent in mechanical physical properties such as tensile strength, rigidity, surface hardness, and impact resistance, and chemical resistance, is most preferred.

[0041] The electrode assembly (not shown) has a structure in which a negative electrode and a positive electrode are alternately laminated multiple times with a separation membrane interposed therebetween. A pair of electrode terminals 220 including a negative electrode tab and a positive electrode tab are electrically connected to the negative electrode tab and the positive electrode tab, and then are exposed to the outside of the cell case 210.

[0042] More specifically, regarding the electrode assembly, it can be a jelly roll type cell assembly having a structure in which a separation membrane is interposed between a long sheet-like positive electrode and a negative electrode and then wound up, a stack type cell assembly composed of unit cells having a structure in which a separation membrane is interposed and laminated between rectangular positive electrodes and negative electrodes, a stack folding type cell assembly in which unit cells are wound up by a long separation film, or a lamination stack type cell assembly in which unit cells are laminated with a separation membrane interposed therebetween and adhered to each other, etc., but is not limited thereto.

[0043] For example, in FIGS. 2 and 3, three battery cells 200 are shown as being mounted on the frame portion 100, but it is not necessarily limited thereto, and it can be two or four or more.

[0044] The BMU (Battery Management Unit) 300 known as a battery management unit is configured to control the operation of the battery cell 200, and includes a printed circuit board 310, a BMU cable 320, and a BMU connector 330. Specifically, the positive electrode terminal and the negative electrode terminal of the battery cell 200 are electrically / mechanically connected to the printed circuit board 310, and it controls the power supply supplied to a device (not shown) via the cable 320 and the connector 330, recognizes overcharging, over-discharging, over-current, etc., and functions to prevent overheating and explosion that may occur thereby. Of course, it goes without saying that it can be provided with an element (not shown) for maintaining the charge / discharge voltage and / or current and preventing an overcharged state and / or an over-discharged state. Since such a BMU 300 corresponds to a known device, a more specific description is omitted.

[0045] Next, the BMU cover 400 is disposed on one surface of the BMU 300, that is, on the upper surface of the BMU 300 when viewed in the drawing, in order to prevent the BMU 300 from being damaged. When the frame part 100 bends in the longitudinal direction (X-axis direction) or the width direction (Y-axis direction) due to various causes such as external forces, the BMU 300 also bends together, and breakage or failure of the components constituting the BMU 300 may occur. Therefore, in order to protect the BMU 300 from external forces, it is preferable to provide the BMU cover 400.

[0046] The BMU cover 400 that performs the above functions preferably has a size that completely covers the BMU 300, and more preferably is made of an insulating material for preventing short circuits. Specific descriptions of such a BMU cover 400 will be described later.

[0047] The first packaging member 500 is mounted so as to cover one surface of the frame part 100, that is, the upper surface of the frame part 100 when referring to FIG. 3. Here, the first packaging member 500 is preferably a thin sheet that covers the entire upper surface of the frame part 100, and more preferably includes a number of fixing parts 510 that extend to a partial area of the other surface of the frame part 100 along the edge so that it cannot be easily removed after being attached to the frame part 100. Here, an adhesive layer may be provided on the entire inner surface of the first packaging member 500 or the inner surface of the fixing part 510.

[0048] The second packaging member 600 is attached to the other surface of the frame part 100, that is, the lower surface of the frame part 100, and is a thin sheet having a size that covers the entire lower surface of the frame part 100, and may be made of the same material as the first packaging member 500.

[0049] Here, an adhesive layer is preferably formed on the inner surface of the second packaging member 600, that is, the surface that contacts the lower surface of the frame part 100.

[0050] In this way, the first packaging member 500 and the second packaging member 600 are respectively positioned on the upper and lower surfaces of the frame portion 100, and the frame portion 100, the battery cell 200, the BMU 300, and the BMU cover 400 are fixed so as not to be able to move freely and are protected from external impacts. Of course, it is also possible to prevent the penetration of external foreign matters and moisture.

[0051] FIG. 5 is a perspective view of the frame portion constituting the battery pack of the present invention as viewed in one direction, and FIG. 6 is a perspective view of the frame portion shown in FIG. 5 as viewed in the other direction.

[0052] The frame portion 100 according to the present invention includes an outer frame 110, a support frame 120, a plurality of accommodating portions 130, a first rib 140, and a second rib 150.

[0053] The outer frame 110 has a central opening so as to form an accommodation space S for the battery cell, and forms the overall outer shape of the battery pack. The support frame 120 located inside one side edge portion of the outer frame 110 suppresses bending deformation in the longitudinal direction and the width direction, and is a space in which electrode terminals, a BMU, and a BMU cover are arranged.

[0054] Here, the support frame 120 preferably includes a first mounting portion 121 and a second mounting portion 122 that is relatively thicker than the first mounting portion 121. The electrode terminal of the battery cell 200 is preferably mounted on the first mounting portion 121, and the printed circuit board 310 is more preferably mounted on the second mounting portion 122. Most preferably, a first opening 121a is formed in the first mounting portion 121.

[0055] The thicker the support frame 120 is, the stronger it is against bending deformation in the longitudinal direction and the width direction. However, in this case, the battery pack also inevitably becomes thicker and it is difficult to miniaturize. On the other hand, in the present invention, while suppressing an increase in the thickness of the battery pack, by designing the portion where the electrode terminal is not mounted to be thick and the portion where the electrode terminal is mounted to be relatively thin, it is very effective in preventing bending deformation.

[0056] Also, since each terminal is individually mounted in a state separated by a predetermined distance from the groove-shaped first mounting portion 121, it is possible to contribute to preventing short circuits of the terminals while suppressing the floating of the electrode terminals. Further, since the electrode terminals are exposed to the outside through the first opening 121a of the first mounting portion 121, the welding operation with the printed circuit board 310 is convenient, and the heat generated during operation can be easily released, so it can also contribute to ensuring safety.

[0057] Of course, there is no limitation on the number and position of the first mounting portions 121 shown in FIGS. 5 and 6, and it can be changed as much as possible depending on the number and position of the battery cells accommodated in the outer frame 110.

[0058] The plurality of accommodating portions 130 provided on the upper surface of the support frame 120 are formed in the longitudinal direction and / or the width direction, and can contribute to fixing the BMU cover and increasing the rigidity of the battery pack.

[0059] One side of the first rib 140 is connected to the outer frame 110, and the other side is connected to the support frame 120, more specifically, the second rib 150, thereby suppressing the bending deformation in the width direction while partitioning the accommodation space S of the battery cell. And the second rib 150 is a configuration for minimizing the bending in the longitudinal direction, and its detailed description will be described later.

[0060] On the other hand, the BMU cable 320 and the BMU connector 330 need to protrude outside the outer frame 110 so as to be connected to a device (not shown). Therefore, in a predetermined region, more specifically, the outer frame 110 is provided with a cutout 111 corresponding to these passages.

[0061] FIG. 7 is an enlarged perspective view of part A of FIG. 5, FIG. 8 is an enlarged perspective view of part B of FIG. 5, and FIG. 9 is an enlarged perspective view of part C of FIG. 5.

[0062] The accommodating portion will be described in detail with reference to FIGS. 5 to 9 together.

[0063] The accommodating portion 130 located on the upper surface of the support frame 120 may be composed of a total of four accommodating portions, namely, one first accommodating portion 131, two second accommodating portions 132, and one third accommodating portion 133.

[0064] First, the first accommodating portion 131 is provided at one side edge in the width direction of the support frame 120. The first accommodating portion 131 is located at a predetermined distance from the inner surface of the outer frame 110 having a predetermined height, and includes a first accommodating plate 131a provided with a first fastening hole 131a' and a first connecting portion 131b connecting the first accommodating plate 131a and the outer frame 110 (see FIG. 7).

[0065] Two second accommodating portions 132 are provided at a predetermined interval on one side edge in the longitudinal direction of the support frame 120, and the configurations of the respective second accommodating portions 132 are the same. The second accommodating portion 132 is located at a predetermined distance from the inner surface of the outer frame 110 having a predetermined height, and includes a second accommodating plate 132a provided with a second fastening hole 132a' and a pair of second connecting portions 132b connecting the second accommodating plate 132a and the outer frame 110 (see FIG. 8).

[0066] In particular, the second accommodating portion 132 is located at a predetermined interval from the second rib 150 having a lattice structure with a double rib structure, more preferably a double rib structure and provided with a plurality of partition walls connecting them to face each other, so that the boundary surface of the battery cell, which is vulnerable to bending deformation in the longitudinal direction, that is, the bending deformation near the first rib 140 can be minimized.

[0067] The third accommodating portion 133 is located at the other side edge in the width direction of the support frame 120, that is, facing the first accommodating portion 131.

[0068] The third accommodating portion 133 is located at a predetermined distance from the inner surface of the outer frame 110 having a predetermined height, and includes a third accommodating plate 133a provided with a third fastening hole 133a' and a third connecting portion 133b connecting the third accommodating plate 133a and the outer frame 110.

[0069] FIG. 10 is a perspective view of a BMU cover forming a battery pack of the present invention as viewed from above, FIG. 11 is a perspective view of the BMU cover shown in FIG. 10 as viewed with the cover, and FIG. 12 is a front view of the BMU cover shown in FIG. 10. Further, FIG. 13 is an enlarged perspective view of part A of FIG. 11, FIG. 14 is an enlarged perspective view of part B of FIG. 11, and FIG. 15 is an enlarged perspective view of part C of FIG. 11.

[0070] With reference to FIGS. 10 to 15, the BMU cover 400 having a number of insertion portions will be described in detail.

[0071] The BMU cover 400 is located above the support frame 120, has a substantially rectangular shape, and includes a cover plate 410, a third rib 420, and four insertion portions 430.

[0072] First, one or more second openings 411 are provided in a predetermined region of the cover plate 410. Such second openings 411 are for preventing direct interference even when an element (not shown) mounted on the printed circuit board 310 jumps up to a certain height and enhancing the heat dissipation effect. Therefore, the position and size of the second opening 411 can be changed as much as possible depending on the size and arrangement structure of the elements on the printed circuit board 310.

[0073] The third rib 420 is provided on the inner surface of the cover plate 410, that is, the surface facing the other surface of the BMU 300, and is arranged so as to intersect in the width direction and / or the longitudinal direction, thereby minimizing the bending deformation in the width direction and the longitudinal direction. Of course, the third rib 420 can also function to press the printed circuit board 310 so that it cannot move.

[0074] The four insertion portions 430 can include one first insertion portion 431, two second insertion portions 432, and one third insertion portion 433.

[0075] First, the first insertion part 431 is inserted into the first accommodation part 131 of the support frame 120. Specifically, it includes a first insertion plate 431a extending vertically from one side edge in the width direction of the cover plate 410, and a first hook 431b formed on the inner surface of the first insertion plate 431a and fastened to the first fastening hole 131a'.

[0076] The second insertion part 432 is inserted into the second accommodation part 132 of the support frame 120, and includes a second insertion plate 432a extending vertically from the edge of the cover plate 410, and a second hook 432b formed on the inner surface of the second insertion plate 432a and fastened to the second fastening hole 132a'. Of course, the configuration of each of the two second insertion parts 432 is the same.

[0077] The third insertion part 433 can be inserted into the third accommodation part 133 of the support frame 120, and includes a third insertion plate 433a extending vertically from the other side edge in the width direction of the cover plate 410, and a third hook 433b formed on the inner surface of the third insertion plate 433a and fastened to the third fastening hole 133a'.

[0078] On the other hand, the first insertion plate 431a, the second insertion plate 432a, and the third insertion plate 433a that constitute each insertion part are connected to each other or provided on the third rib 420 arranged along the edge of the cover plate 410 so as to suppress bending deformation in the longitudinal direction and the width direction.

[0079] Those with ordinary knowledge in the field to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content.

Explanation of Reference Numerals

[0080] 100 Frame part 110 Outer frame 111 Cut part 120 Support frame 121 First mounting part 121a First opening 122 Second mounting part 130 Accommodation part 131 First accommodation part 131a First accommodation plate 131a’ First fastening hole 131b First connecting part 132 Second accommodation part 132a Second accommodation plate 132a’ Second fastening hole 132b Second connecting part 133 Third accommodation part 133a Third accommodation plate 133a’ Third fastening hole 133b Third connecting part 140 First rib 150 Second rib 200 Battery cell 210 Cell case 220 Electrode terminal 300 BMU 310 Printed circuit board 320 BMU cable 330 BMU connector 400 BMU cover 410 Cover plate 411 Second opening 420 Third rib 430 Insertion part 431 First insertion part 431a First insertion plate 431b First hook 432 Second insertion part 432a Second insertion plate 432b Second hook 433 Third insertion part 433a Third insertion plate 433b Third hook 500 First packaging member 510 Fixing part 600 Second packaging member S Accommodation space

Claims

1. a frame part including a rectangular outer frame forming a receiving space and a support frame located inside one side edge of the outer frame along a longitudinal direction; A battery cell accommodated in the accommodation space; a BMU having one surface facing an upper surface of the support frame and electrically connected to the battery cell; a BMU cover having a cover plate located on another side of the BMU; the frame portion further includes one or more first ribs extending in a width direction with one side connected to the outer frame, and a second rib having a double rib structure positioned along an edge of the longitudinal direction of the support frame and connected to the other side of the first rib.

2. The battery pack according to claim 1 , wherein the support frame is composed of a first mounting portion and a second mounting portion that is thicker than the first mounting portion.

3. The battery pack according to claim 2 , wherein the first mounting portion has a first opening, and a terminal of the battery cell is mounted in the first opening.

4. The battery pack according to claim 3 , wherein a printed circuit board of the BMU is mounted in the second mounting portion.

5. 2. The battery pack according to claim 1, wherein the upper surface of the support frame is provided with a plurality of accommodating portions along a longitudinal direction and / or a width direction, and the cover plate is provided with a plurality of insertion portions to be inserted into the accommodating portions.

6. the receiving portion is a first receiving portion including: a first receiving plate provided at one side edge in a width direction of the support frame, the first receiving plate being spaced a predetermined distance from an inner surface of the outer frame having a predetermined height, the first receiving plate having a first fastening hole; and a first connecting portion connecting the first receiving plate and the outer frame, 6. The battery pack of claim 5, wherein the insertion portion is a first insertion portion including: a first insertion plate extending vertically from one widthwise edge of the cover plate; and a first hook formed on an inner surface of the first insertion plate and fastened to the first fastening hole.

7. the receiving portion is a second receiving portion including: a second receiving plate provided at one side edge of the support frame in a longitudinal direction, the second receiving plate being spaced a predetermined distance from an inner surface of an outer frame having a predetermined height, the second receiving plate having a second fastening hole; and a pair of second connecting portions connecting the second receiving plate and the outer frame, 7. The battery pack of claim 6, wherein the insertion portion is a second insertion portion including: a second insertion plate extending vertically from an edge of the cover plate; and a second hook formed on an inner surface of the second insertion plate and fastened to the second fastening hole.

8. the receiving portion is a third receiving portion including: a third receiving plate provided at the other edge portion in the width direction of the support frame, the third receiving plate being spaced a predetermined distance from an inner surface of the outer frame having a predetermined height, and having a third fastening hole; and a third connecting portion connecting the third receiving plate and the outer frame, 7. The battery pack of claim 6, wherein the insertion portion is a third insertion portion including: a third insertion plate extending vertically from the other widthwise edge of the cover plate; and a third hook formed on an inner surface of the third insertion plate and fastened to the third fastening hole.

9. The battery pack according to claim 1 , wherein the second rib is a lattice structure.

10. The battery pack according to claim 1 , wherein a third rib is provided on an inner surface of the cover plate facing the other surface of the BMU so as to intersect with the inner surface along a width direction and / or a length direction.

11. The battery pack according to claim 10 , wherein the cover plate is formed with one or more second openings.

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