Secondary battery pack

Abstract

To provide a secondary battery pack capable of stable support and electric connection of a BMS circuit even if a connection part between a bus bar and the BMS circuit is mutually in a non-parallel state.SOLUTION: A secondary battery pack includes: a holder in which an accommodation space is formed; a plurality of unit battery cells that are inserted in the accommodation space; a connection tab that electrically connects the plurality of unit battery cells over the holder; a bus bar that is electrically connected to the connection tab and includes a connection part extending over the holder; a BMS circuit that is electrically connected to the connection part; and a support part that is installed between the connection part and the BMS circuit and supports the BMS circuit to an upper surface of the holder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a secondary battery pack that enables stable electrical connection between a bus bar and a BMS circuit and has improved durability. [Background technology]

[0002] Generally, rechargeable secondary batteries are widely used as the power source for wireless mobile devices. These batteries are attracting attention as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are proposed as a solution to the air pollution caused by conventional gasoline or diesel vehicles that use fossil fuels.

[0003] When such batteries are alternately charged and discharged, the charging and discharging of the battery must be efficiently controlled and managed to maintain proper operating conditions and performance.

[0004] For this reason, a battery management system (BMS) is installed in the battery pack to manage the battery status and performance. The BMS measures the battery current, voltage, temperature, etc. and records them in memory to manage the battery.

[0005] Such a BMS is electrically connected from the secondary battery pack to the battery by a bus bar and manages the condition and performance of the battery.

[0006] However, if the connection between the busbar and the BMS cannot be kept horizontal, it becomes difficult to achieve a stable electrical connection, which reduces durability. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of one embodiment of the present invention is to provide a secondary battery pack that can stably support and electrically connect a BMS circuit even when the connection portions of the bus bar and the BMS circuit are not horizontal to each other. [Means for solving the problem]

[0008] One embodiment of the present invention includes a holder having an accommodating space formed therein; a plurality of unit battery cells to be inserted into the accommodating space; connection tabs that electrically connect the plurality of unit battery cells at an upper portion of the holder; a bus bar including a connection portion electrically connected to the connection tab and extending to an upper portion of the holder; a BMS circuit electrically connected to the connection portion; and a support portion disposed between the connection portion and the BMS circuit and supporting the BMS circuit on an upper surface of the holder.

[0009] The holder may include a first holder having a plurality of accommodating spaces formed therein for accommodating portions of the unit battery cells and a first connection tab provided at a lower portion thereof, and a second holder installed above the first holder, having a plurality of accommodating spaces formed therein for accommodating other portions of the unit battery cells and a second connection tab provided at an upper portion thereof.

[0010] The busbar may include a busbar plate extending in a first direction from a side surface of the holder and fixed by a fastening member, a connection protrusion protruding from an edge of the busbar plate, extending toward the top of the holder, and electrically connected to the connection tab, and a connection portion protruding from the edge of the busbar plate, extending toward the top of the holder, and electrically connected to the BMS circuit.

[0011] The support can include a round block that supports the lower surface of the BMS circuit.

[0012] The round block may have a first side formed with a rounded surface that is supported on the upper side of the connection portion, and a second side opposite the first side formed with a flat surface that is supported on the lower surface of the BMS circuit.

[0013] A support protrusion for supporting the connection portion may protrude from the upper surface of the holder.

[0014] A round support portion for supporting the connection portion can be inserted into the upper portion of the support protrusion.

[0015] The round support portion may include a round portion positioned on the upper portion of the support protrusion and having a rounded surface formed on the upper portion, and a pair of fixing pieces bent on opposite sides of the round portion toward the side of the connection portion.

[0016] The pair of fixing pieces can be inserted into the inside of the side surfaces of the rounded portion.

[0017] The support portion may further include a fixing portion that is fixed to the connection portion of the bus bar and has a portion fixed to the BMS circuit.

[0018] The fixing portion may include a support plate located on the surface of the connection portion of the bus bar, and an insertion protrusion that protrudes from the edge of the support plate and is inserted and fixed into the BMS circuit.

[0019] The round block may have a fastening hole formed therein to which the fastening member is connected, the connection portion may have a first through hole formed therein through which the fastening member passes, and the support plate may have a second through hole formed therein through which the fastening member passes.

[0020] A groove into which an end of a fastening member is inserted may be formed on the top surface of the round support.

[0021] The edge of the through hole can be formed with a tapered surface that comes into contact with the rounded portion of the support protrusion. [Effects of the Invention]

[0022] According to one embodiment of the present invention, the inclined state of the bus bar electrically connected to the BMS circuit can be stably supported by the support portion above the holder, and the BMS circuit can be supported horizontally above the holder. As a result, the BMS circuit and the bus bar can be electrically connected stably in a horizontal state by the support bar, and durability can be improved. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is an exploded perspective view of a main part that schematically shows a secondary battery pack according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view of a main portion, schematically illustrating a support protrusion and a round support portion that protrude upward from a holder according to a first embodiment of the present invention and support a connection portion of a bus bar. FIG. [Figure 3] 1 is a perspective view of a main part, schematically illustrating a state in which a support portion is provided above a connection portion of a bus bar according to a first embodiment of the present invention. FIG. [Figure 4] 4 is a side view schematically showing a state in which a support portion is provided above the connection portion of the bus bar in FIG. 3. FIG. [Figure 5] 1 is a cross-sectional view of a main part that schematically illustrates a state in which a bus bar connection portion and a BMS circuit are electrically connected by a support portion according to an embodiment of the present invention. FIG. [Figure 6] 1 is a diagram illustrating a main part of a first embodiment of the present invention, showing a state in which an insertion protrusion of a support part is inserted into and fixed to a BMS circuit. [Figure 7] 10 is a cross-sectional view of a main part, schematically showing a state in which a support portion is provided above a connection portion of a bus bar according to a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unnecessary for explanation are omitted, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0025] FIG. 1 is an exploded perspective view showing a main part of a secondary battery pack according to an embodiment of the present invention.

[0026] As shown in FIG. 1 , a secondary battery pack 100 according to an embodiment of the present invention includes a holder 10 having a plurality of accommodating spaces 11 a, 13 a formed therein; a plurality of unit battery cells 12 to be inserted into the plurality of accommodating spaces 11 a, 13 a; connection tabs 20 electrically connecting the plurality of unit battery cells 12 at an upper portion of the holder 10; a bus bar 30 including a connection portion 35 electrically connected to the connection tabs 20 and extending to an upper portion of the holder 10; a BMS circuit 60 disposed at an upper portion of the holder 10 and electrically connected to the connection portion 35; and a support portion 50 disposed between the connection portion 35 and the BMS circuit 60 to support the BMS circuit 60 horizontally relative to the upper surface of the holder 10 by compensating for any inclination between the lower surface of the BMS circuit 60 and the upper surface of the connection portion 35.

[0027] The holder 10 has a plurality of receiving spaces 11a, 13a formed therein, and a plurality of unit battery cells 12 can be received therein.

[0028] A plurality of accommodating spaces 11a, 13a are formed inside the holder 10, and are arranged in a plurality of rows and columns relative to the entire area of the holder 10, so that a plurality of unit battery cells 12 can be inserted into the holder 10 in a plurality of rows and columns.

[0029] Such a holder 10 can include a first holder 11 and a second holder 13 that house a plurality of unit battery cells 12 .

[0030] The first holder 11 may have a plurality of first accommodating spaces 11a formed therein, each of which accommodates a portion of the unit battery cells 12 .

[0031] The first holder 11 may have first accommodating spaces 11a formed in a plurality of columns and rows so that a portion of the plurality of unit battery cells 12 can be accommodated therein.

[0032] The second holder 13 is installed on the top of the first holder 11, and a plurality of second accommodating spaces 13a for accommodating the unit battery cells 12 together with the first holder 11 may be formed inside.

[0033] The second holder 13 may have second receiving spaces 13a formed in a plurality of columns and rows so that a portion of the plurality of unit battery cells 12 can be received therein.

[0034] Such first holder 11 and second holder 13 may be provided with connection tabs 20 .

[0035] The connection tabs 20 may include a plurality of first connection tabs 21 that electrically connect the upper portions of the plurality of unit battery cells 12 at the upper portion of the holder 10, and a plurality of second connection tabs 23 that electrically connect the lower portions of the plurality of unit battery cells 12 at the lower portion of the holder 10.

[0036] The first connection tab 21 may include a plurality of first tab plates 21a arranged on the lower part of the first holder 11, and a plurality of first tab protrusions 21b protruding from the periphery of the first tab plates 21a and electrically connected to the unit battery cells 12.

[0037] A plurality of first tab plates 21a are arranged and fixed at a distance from each other at the bottom of the first holder 11 and may be electrically connected to some of the unit battery cells 12 at the bottom of the first holder 11. A plurality of first tab protrusions 21b may protrude from the periphery of the first tab plate 21a.

[0038] A plurality of first tab protrusions 21b protrude along the periphery of the first tab plate 21a and can be electrically connected to the unit battery cells 12.

[0039] Depending on the position of the first tab plate 21a, multiple first tab protrusions 21b can be protruded from each of the opposing sides of the first tab plate 21a, or multiple first tab protrusions can be protruded from the peripheral position of either one side.

[0040] A second connection tab 23 may be provided on the top of the second holder 13 to electrically connect the plurality of unit battery cells 12 together.

[0041] The second connection tab 23 may include a plurality of second tab plates 23a arranged on the upper portion of the second holder 13, and a plurality of second tab protrusions 23b protruding from the periphery of the second tab plates 23a and electrically connected to the unit battery cells 12.

[0042] A plurality of second tab plates 23a are arranged and fixed to the upper portion of the second holder 13 while being spaced apart from one another, and can be electrically connected to a portion of the plurality of unit battery cells 12 at the upper portion of the second holder 13. A plurality of second tab protrusions 23b can protrude from the periphery of the second tab plate 23a.

[0043] A plurality of second tab plates 23a are arranged and fixed to the upper portion of the second holder 13 while being spaced apart from one another, and may be electrically connected to some of the unit battery cells 12 at the upper portion of the second holder 13. A plurality of second tab protrusions 23b may protrude from the periphery of the second tab plate 23a.

[0044] A plurality of second tab protrusions 23b protrude along the periphery of the second tab plate 23a and can be electrically connected to the unit battery cells 12.

[0045] Depending on the position where the second tab plate 23a is arranged, multiple second tab protrusions 23b can be protruded on each of the opposing sides of the second tab plate 23a, or multiple second tab protrusions can be protruded at the peripheral position on either side.

[0046] The first connection tab 21 and the second connection tab 23 are respectively installed on the first holder 11 and the second holder 13, and can electrically connect the plurality of unit battery cells 12 to each other.

[0047] On the other hand, the holder 10 may include a bus bar 30 that is electrically connected to the connection tab 20 and includes a connection portion 35 that extends to the top of the holder 10 .

[0048] The bus bars 30 are respectively installed in the first holder 11 and the second holder 13, and can be installed so as to electrically connect the BMS circuit 60 and the unit battery cells 12.

[0049] More specifically, the busbar 30 includes a busbar plate 31 extending from the side of the holder 10 in a first direction (x-axis direction) and fixed by a fastening member, and a connection portion 35 protruding from the periphery of the busbar plate 31, extending toward the top of the holder 10, and electrically connected to the BMS circuit 60.

[0050] The bus bar plate 31 can be installed on a side surface of the holder 10 including the first holder 11 or the second holder 13 in a state where it extends a long length in the first direction.

[0051] The bus bar plate 31 may have a connecting protrusion 33 protruding from a peripheral edge extending in the first direction from the side surface of the holder 10, the connecting protrusion 33 being electrically connected to the connecting tab 20.

[0052] The connection protrusion 33 extends in a bent state from the periphery of the busbar plate 31 to the position where the connection tab 20 is formed, and can be electrically connected to the connection tab 20 by a fastening member 15 such as a bolt.

[0053] A plurality of connection protrusions 33 may be protruded to stably fix the bus bar plate 31 to the side surface of the holder 10 and to stably connect the bus bar plate 31 to the connection tab 20 .

[0054] On the other hand, the bus bar plate 31 can have protruding connection portions 35 that are connected to the BMS circuit 60 .

[0055] The connection portion 35 has one side connected to the periphery of the bus bar plate 31 and the other side extending toward the upper portion of the holder 10 and can be electrically connected to the BMS circuit 60.

[0056] The connection portion 35 can be fixed to and electrically connected to the BMS circuit 60 by a fastening member 15 while being inserted between the BMS circuit 60 and the upper portion of the holder 10 .

[0057] The lower part of the connecting part 35 can be supported by a support protrusion 42 on the upper side of the holder 10 .

[0058] FIG. 2 is a perspective view of a main part, schematically showing a support protrusion and a round support portion that protrude upward from the holder according to the embodiment of the present invention and support the connection portion of the bus bar.

[0059] 2, the support protrusion 42 protrudes in a cylindrical shape from the upper side of the second holder 13, and may be formed on the upper side of the second holder 13 so that the connection part 35 is supported while being spaced apart from the upper surface of the second holder 13. The support protrusion 42 is not necessarily limited to a cylindrical shape, and may be changed to a polygonal pillar shape, etc.

[0060] The round support portion 40 can be inserted into the upper portion of such a support protrusion 42 .

[0061] The round support portion 40 supports the flat lower surface of the connection portion 35 of the busbar 30 and can be inserted into the support protrusion 42 to provide stable support in accordance with the inclination of the connection portion 35.

[0062] More specifically, the round support portion 40 may include a round portion 41 positioned on the top of the support protrusion 42 and having a rounded surface formed on the top, and a pair of fixing pieces 43 bent from opposite sides of the round portion 41 toward the side of the connection portion 35 and inserted into the side of the support protrusion 42.

[0063] The rounded portion 41 protrudes from the upper portion of the support protrusion 42, and may have a rounded upper surface.

[0064] The rounded portion 41 has a rounded surface that supports the lower surface of the connection portion 35 of the busbar 30, and the upper surface is formed in a round shape with a constant curvature, allowing for stable support in accordance with the inclination of the connection portion 35. The rounded portion 41 may be formed with a groove 41a into which the end of the fastening member 15 is inserted.

[0065] Fixing pieces 43 may be formed by bending the rounded portion 41 on both opposing sides.

[0066] The fixing pieces 43 are formed by bending the opposite sides of the round portion 41 toward the side of the support protrusion 42, and can be pressed and fixed in place while inserted into the opposite sides of the support protrusion 42 during the process of fixing the round support portion 40 to the top of the support protrusion 42.

[0067] The fixing piece 43 may be installed in a state where it is inserted into the inside of the side surface of the support protrusion 42. That is, an insertion groove (not shown) into which the fixing piece 43 can be inserted may be formed on both opposing sides of the support protrusion 42.

[0068] Therefore, the fixing piece 43 is installed inside the side of the support protrusion 42 while being inserted into the insertion groove, so that the fixing piece 43 does not interfere with adjacent parts and can be installed stably.

[0069] Meanwhile, the connection part 35 can be inserted at an angle to a position between the BMS circuit 60 and the holder 10. Therefore, to ensure a stable connection between the connection part 35 and the BMS circuit 60, a support part 50 can be installed between the BMS circuit 60 and the holder 10. A first through hole 35a for fixing the fastening member 15 can be formed in the connection part 35.

[0070] The support part 50 is inserted between the connection part 35 and the BMS circuit 60, and when the connection part 35 and the BMS circuit 60 are installed at different inclinations, the support part 50 can be installed to stably support the BMS circuit 60 at an upper position of the holder 10 while ensuring a stable electrical connection between the bus bar 30 and the BMS circuit 60.

[0071] FIG. 3 is a perspective view of a main part, schematically illustrating a state in which a support part is provided above the connection part of a busbar according to one embodiment of the present invention. FIG. 4 is a side view of a main part, schematically illustrating a state in which a support part is provided above the connection part of the busbar of FIG. 3. FIG. 5 is a cross-sectional view of a main part, schematically illustrating a state in which the connection part of the busbar and a BMS circuit are electrically connected by the support part according to one embodiment of the present invention. FIG. 6 is a drawing of a main part, schematically illustrating a state in which an insertion protrusion of the support part according to one embodiment of the present invention is inserted into and fixed in the BMS circuit.

[0072] 3 to 6, the support part 50 will be described in more detail. The support part 50 may include a fixing part 51 that is fixed to the connection part 35 of the busbar 30 and a portion of which is fixed to the BMS circuit, and a round block 53 that is fixed to the fixing part 51 and supports the lower surface of the BMS circuit 60.

[0073] The fixing portion 51 can be installed so that a portion thereof can be fixed to the BMS circuit 60 while being positioned on the upper surface of the connection portion 35 of the bus bar 30.

[0074] Such a fixing portion 51 may include a support plate 51a located on the surface of the connection portion 35 of the busbar 30, and an insertion protrusion 51b that protrudes from the periphery of the support plate 51a and is inserted and fixed into the BMS circuit 60.

[0075] The support plate 51a may have a flat surface formed on its lower surface and may be positioned in surface contact with the upper surface of the connection portion 35. A second through-hole 51c for the fastening member 15 to pass through may be formed in the support plate 51a.

[0076] The support plate 51a is formed in a substantially rectangular or regular square planar shape, and an insertion protrusion 51b can protrude from the periphery.

[0077] A plurality of insertion protrusions 51b protrude from the periphery of support plate 51a and can be inserted into BMS circuit 60. Insertion protrusions 51b protrude like pins from each of the four corner positions of the rectangular planar shape of support plate 51a and can be inserted and fixed into BMS circuit 60.

[0078] Meanwhile, a round block 53 may be installed on the upper part of the support plate 51a. When positioned on the upper part of the support plate 51a, the round block 53 can be installed to stably support the BMS circuit 60 in a horizontal state even if the inclination of the connection portion 35 of the bus bar 30 changes.

[0079] More specifically, the round block 53 has a first side formed with a round surface 53a that is supported on the surface of the support plate 51a, and a second side opposite the first side that can be supported on the lower surface of the BMS circuit 60.

[0080] In other words, the round block 53 has a lower surface, which is the first side that contacts the support plate 51a, formed as a rounded surface 53a, and a second side opposite the first side that can be formed as a flat surface 53b that comes into surface contact with the BMS circuit 60.

[0081] Therefore, when the round block 53 is placed between the BMS circuit 60 and the support plate 51a, the inclination of the connection portion 35 allows the round surface 53a to be changed to a portion that comes into contact with the support plate 51a, and the BMS circuit 60 can be stably supported in a horizontal position.

[0082] The round block 53 may have a fastening hole 53c formed therein to which the fastening member 15 is coupled.

[0083] Therefore, the fastening member 15 is coupled to the fastening hole 53c of the round block 53, with a portion passing through the first through-hole 35a of the connecting portion 35 and the second through-hole 51c of the support plate 51a, thereby fixing the round block 53 to the upper side of the connecting portion 35. The end of such a fastening member 15 can be inserted into the groove 41a formed in the round portion 41.

[0084] As a result, the fastening member 15 is fastened through the fastening hole 53c, the first through hole 35a, and the second through hole 51c, thereby stably connecting the connection portion 35 of the busbar 30 between the holder 10 and the BMS circuit 60 and stably supporting the BMS circuit 60 in a horizontal state.

[0085] As described above, in the secondary battery pack 100 of this embodiment, the inclined state of the bus bar 30 that electrically connects the connection tab 20 provided on the holder 10 and the BMS circuit 60 can be stably supported by the support portion 50, and the BMS circuit 60 can be stably supported in a horizontal state above the holder 10.

[0086] Therefore, the BMS circuit 60 and the bus bar 30 can be electrically connected stably by the support portion 50, and durability can be improved.

[0087] 7 is a cross-sectional view of a main part of a busbar according to a second embodiment of the present invention, showing a state in which a support part is provided above the connection part. The same reference numbers as those in FIGS. 1 to 6 refer to the same or similar parts with the same or similar functions. Hereinafter, detailed explanations of the same reference numbers will be omitted.

[0088] As shown in FIG. 7, in the connection portion 35 of the bus bar 30 according to the second embodiment of the present invention, a tapered surface 35b may be formed on the periphery of the first through hole 35a.

[0089] When the connecting portion 35 is fixed to the rounded portion 41 at the top of the support protrusion 42, the tapered surface 35b can increase the area where the first through hole 35a of the connecting portion 35 comes into contact with the rounded portion 41. Therefore, the connecting portion 35 is fixed to the rounded portion 41 with a larger contact area, allowing for more stable fixing.

[0090] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made within the scope of the claims, the detailed description of the invention, and the accompanying drawings, and it is natural that these also fall within the scope of the present invention. [Explanation of symbols]

[0091] 10 Holder 11 First Holder 11a First Storage Space 12 unit battery cells 13 Second Holder 13a Secondary Storage Space 15 Fastening members 20 Connections tab 21 First Connection Tab 21a First tab plate 21b First tab protrusion 23 Second Connection Tab 23a Second tab plate 23b Second tab protrusion 30 Busbar 31 Busbar plate 33 Connection protrusion 35 Connection 35a First through hole 35b tapered surface 40 round support 41 Round Section 41a Groove 42 Support protrusion 43 Fixed piece 50 Support part 51 Fixed part 51a Support plate 51b Insertion protrusion 51c Second through hole 53 Round Block 53a Round surface 53b flat surface 53c fastening hole 60 BMS circuit

Claims

1. a holder having an internal storage space; a plurality of unit battery cells inserted into the accommodating space; a connection tab that electrically connects the plurality of unit battery cells to each other at an upper portion of the holder; a bus bar electrically connected to the connection tab and including a connection portion extending to an upper portion of the holder; a BMS circuit electrically connected to the connection portion; a support portion disposed between the connection portion and the BMS circuit and configured to support the BMS circuit on an upper surface of the holder; a secondary battery pack including:

2. The holder is a first holder having a plurality of receiving spaces formed therein for receiving portions of the unit battery cells and having first connection tabs provided at a lower portion thereof; a second holder disposed on the first holder, the second holder having a plurality of receiving spaces formed therein for receiving other portions of the unit battery cells, and the second holder having second connection tabs formed thereon; The secondary battery pack according to claim 1 , comprising:

3. The bus bar is a bus bar plate extending in a first direction from a side surface of the holder and fixed by a fastening member; a connecting protrusion protruding from an edge of the bus bar plate, extending upward toward the holder, and electrically connected to the connecting tab; 3. The secondary battery pack according to claim 2, further comprising: a connection portion protruding from an edge of the bus bar plate, extending toward an upper portion of the holder, and electrically connected to the BMS circuit.

4. The secondary battery pack according to claim 1 , wherein the support portion includes a round block that supports a lower surface of the BMS circuit.

5. The round block is 5. The secondary battery pack according to claim 4, wherein a first side surface has a rounded surface supported by an upper side of the connection portion, and a second side surface opposite the first side surface has a flat surface supported by a lower surface of the BMS circuit.

6. The secondary battery pack according to claim 4 , wherein a support protrusion for supporting the connection portion protrudes from an upper surface of the holder.

7. The secondary battery pack according to claim 6 , wherein a round support portion that supports the connection portion is inserted into an upper portion of the support protrusion.

8. The round support portion is a rounded portion located on an upper portion of the support protrusion and having a rounded surface formed on an upper portion thereof; a pair of fixing pieces bent from opposite sides of the rounded portion toward the side surfaces of the connecting portion; The secondary battery pack according to claim 7 , comprising:

9. The secondary battery pack according to claim 8 , wherein the pair of fixing pieces are inserted into the inside of the side surfaces of the rounded portion.

10. The support portion is The secondary battery pack according to claim 8 , further comprising a fixing portion fixed to the connection portion of the bus bar, a portion of which is fixed to the BMS circuit.

11. The fixing portion is a support plate located on a surface of the connection portion of the bus bar; An insertion protrusion that protrudes from an edge of the support plate and is inserted and fixed to the BMS circuit; The secondary battery pack according to claim 10 , comprising:

12. 12. The secondary battery pack of claim 11, wherein the round block has a fastening hole to which a fastening member is coupled, the connection portion has a first through hole through which the fastening member passes, and the support plate has a second through hole through which the fastening member passes.

13. The secondary battery pack of claim 12 , wherein a groove into which an end of the fastening member is inserted is formed on an upper surface of the round support.

14. The secondary battery pack according to claim 12 , wherein an edge of the first through hole is formed with a tapered surface that comes into contact with the rounded portion of the support protrusion.

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