Secondary battery pack

Abstract

To provide a secondary battery pack in which a part where a connection tab is electrically welded and bonded to a battery cell and a part where the connection tab is electrically welded and bonded to a bus bar are separated to an upper part and a side surface position of a holder and a BMS circuit and the bus bar can be electrically connected to each other stably.SOLUTION: A secondary battery pack according to one example includes a holder in which a plurality of accommodation spaces are formed inside, a plurality of unit cells inserted into the accommodation spaces, a battery connection tab that electrically connects the unit battery cells in the holder, a plurality of bus bar connection tabs that are coupled to edges of an upper part and a lower part of the holder, electrically connected to a part of the unit cells, and have their bent fixed pieces projecting to a side surface of the holder, a bus bar including a connection projection part that is electrically connected to the fixed piece of the bus bar connection tab and bends and extends to the upper part of the holder, and a BMS circuit provided at the upper part of the holder and electrically connected to the connection projection part.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 power sources for wireless mobile devices. These batteries are also 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, there is a need to efficiently control the charging and discharging of the battery and manage the battery 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] The BMS is electrically connected to the battery of the secondary battery pack via a bus bar to manage the battery's condition and performance. When connecting the BMS to the bus bar, a portion of the bus bar is bent to electrically connect it to the BMS.

[0006] However, the first position where the bent portion of the busbar is electrically connected to the BMS and the second position where the tab that connects the busbar to the battery cell is connected are unstable, resulting in an unstable electrical connection and reduced 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 in which the portion where the connection tab is electrically welded to the battery cell and the portion where the connection tab is electrically welded to the bus bar are separated at the top and side positions of the holder, respectively, thereby enabling a stable electrical connection between the BMS circuit and the bus bar. [Means for solving the problem]

[0008] One embodiment of the present invention includes a holder having a plurality of accommodating spaces formed therein; a plurality of unit battery cells to be inserted into the plurality of accommodating spaces; battery connection tabs electrically connecting the plurality of unit battery cells in the holder; a plurality of bus bar connection tabs coupled to each of the upper and lower edges of the holder, electrically connected to portions of the plurality of unit battery cells, and having fixing pieces that bend and protrude from side surfaces of the holder; a bus bar electrically connected to the fixing pieces of the bus bar connection tabs, and including connecting protrusions that bend and extend to the upper part of the holder; and a BMS circuit provided on the upper part of the holder and electrically connected to the connecting protrusions.

[0009] The battery connection tabs may include a plurality of first connection tabs that electrically connect the lower portions of the plurality of unit battery cells at the lower portion of the holder, and a plurality of second connection tabs that electrically connect the upper portions of the plurality of unit battery cells at the upper portion of the holder.

[0010] The holder may include a first holder having a plurality of first accommodating spaces formed therein for accommodating some of the unit battery cells and a first connection tab provided at a lower portion thereof, and a second holder provided above the first holder having a plurality of second accommodating spaces formed therein for accommodating other parts of the unit battery cells and a second connection tab provided at an upper portion thereof.

[0011] A first insertion groove into which the fixing piece of the bus bar connection tab is inserted and fixed can be formed on the side surface of the first holder.

[0012] A plurality of first insertion grooves may be formed on the side surface of the first holder along the first direction.

[0013] A second insertion groove may be formed on the side surface of the second holder, into which the fixing piece of the bus bar connection tab is inserted and fixed.

[0014] A plurality of second insertion grooves may be formed on the side surface of the second holder along the first direction.

[0015] The first connection tab may include a plurality of first tab plates arranged on the lower part of the first holder, and a plurality of first tab protrusions protruding from the edges of the first tab plates and electrically connected to the unit battery cells.

[0016] The second connection tab may include a plurality of second tab plates arranged on the top of the second holder, and a plurality of second tab protrusions protruding from the edge of the second tab plate and electrically connected to the unit battery cells.

[0017] The busbar connection tabs can include a third connection tab electrically connected to the plurality of unit battery cells at the lower edge of the first holder and a portion extending therefrom to be electrically connected to the BMS circuit, and a fourth connection tab electrically connected to the plurality of unit battery cells from the upper edge of the second holder and a portion extending therefrom to be electrically connected to the BMS circuit.

[0018] The third connection tab may include a third tab plate disposed on a lower edge of the first holder; a plurality of third tab protrusions protruding from one edge of the third tab plate and electrically connecting to the unit battery cells; and a first fixing piece bent from the other edge of the third tab plate toward the side of the first holder, inserted into the plurality of first insertion grooves, and formed with first fixing holes that are fixed by fastening members.

[0019] A first guide piece that comes into surface contact with a side surface of the first holder can protrude from one edge of the third plate.

[0020] The first fixing hole may be formed in the first fixing piece in the shape of an elongated hole.

[0021] The fourth connection tab may include a fourth tab plate disposed on an upper edge of the second holder; a plurality of fourth tab protrusions protruding from one edge of the fourth tab plate and electrically connected to the unit battery cells; and a second fixing piece bent from the other edge of the fourth tab plate toward the side of the second holder and having second fixing holes formed therein that are inserted into the plurality of second insertion grooves and fixed by fastening members.

[0022] A second guide piece that comes into surface contact with the side surface of the first holder can protrude from one edge of the fourth plate.

[0023] The second fixing hole may be formed in the second fixing piece in the shape of an elongated hole.

[0024] The bus bars can include a first bus bar that electrically connects the third connection tab and the BMS circuit, and a second bus bar that electrically connects the fourth connection tab and the BMS circuit.

[0025] The first bus bar may extend along a first direction on a side surface of the first holder, and may have a bent extension portion formed in part thereof that protrudes to be inserted into the plurality of first insertion grooves of the first holder.

[0026] The bent extension portion may have a first fastening hole formed therein, the first fastening hole being connected to the first fixing hole and being fixed to the first holder by a fastening member.

[0027] The first fastening hole may be elongated.

[0028] A first connection protrusion may protrude from one edge of the first bus bar, extending to an upper portion of the second holder and electrically connected to the BMS circuit.

[0029] The second bus bar extends along the first direction on the side surface of the second holder, and a bent portion may be formed on part of the surface to be inserted into the second insertion groove of the second holder.

[0030] The bent portion may have a second fastening hole formed therein, which, when inserted into the second insertion groove, communicates with the second fixing hole of the fourth connection tab and fixes the fastening member to the second holder.

[0031] The second fastening hole may be elongated.

[0032] A second connection protrusion may protrude from one edge of the second bus bar, extending to the top of the second holder and electrically connected to the BMS circuit.

[0033] The second holder may further include a first support portion that protrudes in multiple directions from an upper portion of the second holder and supports the BMS circuit, and a second support portion that protrudes from an upper portion of the second holder and supports the BMS circuit while being connected to the second connection protrusion of the second bus bar.

[0034] The first support portion may be a plurality of support protrusions that protrude from the second holder and support the BMS circuit in a state spaced apart from the second holder.

[0035] The second support part can include a fastening member that passes through the BMS circuit and is fixed to the holder, a support plate having an insertion hole into which the fastening member is inserted, and a fixing part including a plurality of insertion protrusions that protrude from the edge of the support plate and are inserted and fixed to the BMS circuit.

[0036] The fastening member can pass through the second connection protrusion of the second bus bar and fix it to the second holder. [Effects of the Invention]

[0037] According to one embodiment of the present invention, the connection tabs connected to the battery cells and the bus bars are electrically connected at the side of the holder, and the bus bars and the BMS circuit are electrically connected at the top of the holder, thereby enabling stable connection of the electrical connections and improving durability.

[0038] In one embodiment of the present invention, the portion where the battery cell and connection tab are connected and the portion where the battery cell is connected to the bus bar are located at different positions, thereby minimizing manufacturing tolerances of the secondary battery pack and enabling stable electrical connection. [Brief explanation of the drawings]

[0039] [Figure 1] 1 is a perspective view schematically illustrating a secondary battery pack according to an embodiment of the present invention; [Figure 2] 2 is an exploded perspective view of a main part, schematically illustrating a state in which a BMS circuit of the secondary battery pack of FIG. 1 is separated. FIG. [Figure 3] FIG. 2 is an exploded perspective view schematically showing the secondary battery pack of FIG. 1. [Figure 4] FIG. 10 is a perspective view schematically illustrating a third connection tab according to an embodiment of the present invention. [Figure 5] 5 is a perspective view of a main part, schematically showing a portion where a third tab protrusion of the third connection tab of FIG. 4 is formed. FIG. [Figure 6] FIG. 10 is a perspective view schematically illustrating a fourth connection tab according to an embodiment of the present invention. [Figure 7] 1 is an exploded perspective view of a main part, schematically illustrating a state in which a first bus bar according to an embodiment of the present invention is separated into a first holder. FIG. [Figure 8] 8 is a perspective view schematically illustrating a state in which the first bus bar of FIG. 7 is connected to a third connection tab. FIG. [Figure 9] FIG. 10 is a perspective view schematically illustrating a state in which a second bus bar according to an embodiment of the present invention is connected to a fourth connection tab. [Figure 10] 10 is a perspective view of a main part, schematically illustrating a state in which the second bus bar of FIG. 9 is coupled to a second holder. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0040] 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 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.

[0041] FIG. 1 is a perspective view schematically showing a secondary battery pack according to one embodiment of the present invention, FIG. 2 is an exploded perspective view of a main part schematically showing a state in which a BMS circuit of the secondary battery pack of FIG. 1 is separated, and FIG. 3 is an exploded perspective view schematically showing the secondary battery pack of FIG. 1.

[0042] 1 to 3, 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 20 inserted into the plurality of accommodating spaces 11 a, 13 a; battery connection tabs 30, 40 electrically connecting the plurality of unit battery cells 20 in the holder 10; a plurality of bus bar connection tabs 50 coupled to each of the upper and lower edges of the holder 10, electrically connected to portions of the plurality of unit battery cells 20, and having fixing pieces that bend and protrude from the side of the holder 10; a bus bar 60 electrically connected to fixing pieces 51 c, 53 c of the bus bar connection tabs 50, and including connection protrusions 61 b, 63 b that bend and extend to the upper part of the holder 10; and a BMS circuit 90 provided on the upper part of the holder 10 and electrically connected to the connection protrusions.

[0043] The holder 10 has a plurality of receiving spaces 11a, 13a formed therein, and a plurality of unit battery cells 20 can be received therein.

[0044] A plurality of accommodating spaces 11a, 13a are formed inside the holder 10, forming a plurality of columns and rows across the entire area of ​​the holder 10, allowing a plurality of unit battery cells 20 to be inserted into the holder 10 in a plurality of columns and rows.

[0045] Such a holder 10 can include a first holder 11 and a second holder 13 that house a plurality of unit battery cells 20 .

[0046] The first holder 11 may have a plurality of first receiving spaces 11a formed therein to receive some of the unit battery cells 20, and may have first connection tabs 30 provided at the bottom.

[0047] The first holder 11 may have first accommodating spaces 11a formed in a plurality of columns and rows so that some of the plurality of unit battery cells 20 can be accommodated therein.

[0048] A first insertion groove 11b may be formed on the side surface of the first holder 11, into which the first fixing piece 51c is inserted and fixed.

[0049] A plurality of first insertion grooves 11b are formed on the side surface of first holder 11 along a first direction (x-axis direction), and a first fixing piece 51c of a third connection tab 51 constituting a bus bar connection tab 50 (described later) can be inserted into each of the first insertion grooves 11b. This will be described in more detail below while explaining the third connection tab 51.

[0050] Meanwhile, the holder 10 may be provided with battery connection tabs 30, 40 that electrically connect the plurality of unit battery cells 20 together.

[0051] The battery connection tabs 30, 40 may include a plurality of first connection tabs 30 that electrically connect the lower portions of the plurality of unit battery cells 20 at the lower portion of the holder 10, and a plurality of second connection tabs 40 that electrically connect the upper portions of the plurality of unit battery cells 20 at the upper portion of the holder 10.

[0052] The first connection tabs 30 are provided on the lower part of the first holder 11 and are capable of electrically connecting the plurality of unit battery cells 20 together.

[0053] The first connection tab 30 may include a plurality of first tab plates 31 arranged on the lower part of the first holder 11 and a plurality of first tab protrusions 33 protruding from the edges of the first tab plates 31 and electrically connected to the unit battery cells 20.

[0054] A plurality of first tab plates 31 are arranged and fixed to the lower portion of the first holder 11 while being spaced apart from one another, and may be electrically connected to some of the unit battery cells 20 at the lower portion of the first holder 11. A plurality of first tab protrusions 33 may protrude from an edge of the first tab plate 31.

[0055] A plurality of first tab protrusions 33 protrude along the edge of the first tab plate 31 and can be electrically connected to the unit battery cells 20 .

[0056] Depending on the position of the first tab plate 31, the first tab protrusion 33 can be protruded in multiple numbers on each of the opposing sides of the first tab plate 31, or can be protruded in multiple numbers at the edge position on either side.

[0057] The second holder 13 is provided on top of the first holder 11, and a plurality of second accommodating spaces 13a for accommodating the unit battery cells 20 together with the first holder 11 may be formed inside.

[0058] The second holder 13 may have second accommodating spaces 13a formed in a plurality of columns and rows so that some of the unit battery cells 20 can be accommodated therein.

[0059] That is, the second accommodating space 13a can be formed to communicate with the first accommodating space 11a and accommodate the unit battery cells 20 when the first holder 11 and the second holder 13 are positioned one above the other.

[0060] The side surface of the second holder 13 may be formed with a second insertion groove 13b into which the second fixing piece 53c is inserted and fixed.

[0061] A plurality of second insertion grooves 13b are formed on the side surface of second holder 13 along the first direction, and second fixing pieces 53c of fourth connection tabs 53 constituting bus bar connection tabs 50 (described later) can be inserted into the second insertion grooves 13b. This will be described in more detail below while explaining the fourth connection tabs 53.

[0062] The second connection tabs 40 are provided on the top of the second holder 13 and are capable of electrically connecting the plurality of unit battery cells 20 together.

[0063] The second connection tab 40 may include a plurality of second tab plates 41 arranged on the top of the second holder 13, and a plurality of second tab protrusions 43 protruding from the edges of the second tab plates 41 and electrically connected to the unit battery cells 20.

[0064] A plurality of second tab plates 41 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 20 at the upper portion of the second holder 13. A plurality of second tab protrusions 43 may protrude from an edge of the second tab plate 41.

[0065] The second tab protrusions 43 protrude in multiple numbers along the edge of the second tab plate 41 and can be electrically connected to the unit battery cells 20 .

[0066] Depending on the position of the second tab plate 41, the second tab protrusion 43 can be protruded in multiple numbers on each of the opposing sides of the second tab plate 41, or can be protruded in multiple numbers at the edge position on either side.

[0067] The first connection tab 30 and the second connection tab 40 described above are provided on the first holder 11 and the second holder 13, respectively, and are capable of electrically connecting the plurality of unit battery cells 20 to one another.

[0068] On the other hand, the second holder 13 may be provided with busbar connection tabs 50 for connecting the unit battery cells 20 electrically connected by the first connection tabs 30 and the second connection tabs 40 to the busbars 60.

[0069] The busbar connection tabs 50 are coupled to the edges of the first holder 11 and the second holder 13 and electrically connected to the upper portions of some of the unit battery cells 20, and the first fixing pieces 51c and the second fixing pieces 53c can protrude in a bent state from the edges onto the side surfaces of the first holder 11 and the second holder 13.

[0070] More specifically, the busbar connection tabs 50 may include a third connection tab 51 electrically connected to the plurality of unit battery cells 20 at the lower edge of the first holder 11 and extending in part to be electrically connected to the BMS circuit 90, and a fourth connection tab 53 electrically connected to the plurality of unit battery cells 20 at the upper edge of the second holder 13 and extending in part to be electrically connected to the BMS circuit 90.

[0071] FIG. 4 is a perspective view schematically showing a third connection tab according to one embodiment of the present invention, and FIG. 5 is a perspective view schematically showing a main part of the third connection tab of FIG. 4 where a third tab protrusion is formed.

[0072] As shown in Figures 4 and 5, the third connection tab 51 may include a third tab plate 51a disposed on the lower edge of the first holder 11, multiple third tab protrusions 51b protruding from one edge of the third tab plate 51a and electrically connecting to the unit battery cells 20, and first fixing pieces 51c bent from the other edge of the third tab plate 51a toward the side of the first holder 11, inserted into multiple first insertion grooves 11b, and formed with first fixing holes 51d that are fixed by fastening members.

[0073] The third tab plate 51 a is disposed on the edge of the first holder 11 , and has a plurality of third tab protrusions 51 b protruding from one side thereof, which can be electrically connected to a plurality of unit battery cells 20 .

[0074] A first fixing piece 51c that extends in a bent state toward the side surface of the second holder 13 can protrude from the edge of the third tab plate 51a.

[0075] The first fixing piece 51c protrudes from the edge of the third tab plate 51a and can be inserted into a first insertion groove 11b formed in the side surface of the first holder 11.

[0076] The first fixing pieces 51c protrude from the edge of the third tab plate 51a in a number corresponding to the number of the first insertion grooves 11b, and can be inserted into the first insertion grooves 11b.

[0077] The first fixing piece 51c may have a first fixing hole 51d formed therein, which has an elongated hole shape.

[0078] The first fixing hole 51d is for fixing the first connecting protrusion 61b of the busbar 60, which is inserted into the first insertion groove 11b together with the first fixing piece 51c, to the side of the second holder 13 using a fastening member such as a bolt member.

[0079] The first fixing hole 51d is formed in an elongated hole shape, so that when fixing is performed using a fastening member, the installation position of the first connecting protrusion 61b can be appropriately changed.

[0080] On the other hand, a first guide piece 51e can protrude from the edge of the third tab plate 51a so that the third tab plate 51a is stably positioned on the first holder 11.

[0081] The first guide piece 51e can be bent at an angle of approximately 90 degrees so as to bend at the edge of the third tab plate 51a and come into surface contact with the side surface of the first holder 11.

[0082] The first guide piece 51e protrudes from a position between the multiple first fixing pieces 51c at the edge of the third tab plate 51a and can come into surface contact with the side surface of the first holder 11. Therefore, the third connection tab 51 can be stably fixed in a fixed position at the edge position of the first holder 11 by the guiding action of the multiple first guide pieces 51e.

[0083] The first guide piece 51e is rounded and protrudes from the edge of the third tab plate 51a, making it possible to minimize interference with adjacent components.

[0084] Meanwhile, the fourth connection tab 53 is electrically connected to the plurality of unit battery cells 20 at the upper edge of the second holder 13 , and a portion of it can extend to be electrically connected to the BMS circuit 90 .

[0085] FIG. 6 is a perspective view schematically illustrating a fourth connection tab according to an embodiment of the present invention, and FIG. 7 is an exploded perspective view of essential parts schematically illustrating a state in which a first bus bar according to an embodiment of the present invention is separated from a first holder.

[0086] Explaining more specifically with reference to Figures 6 and 7, the fourth connection tab 53 may include a fourth tab plate 53a disposed on the upper edge of the second holder 13, a plurality of fourth tab protrusions 53b protruding from one edge of the fourth tab plate 53a and electrically connecting to the unit battery cells 20, and a second fixing piece 53c bent from the other edge of the fourth tab plate 53a toward the side of the second holder 13, inserted into a plurality of second insertion grooves 13b, and formed with second fixing holes 53d that are fixed by fastening members.

[0087] The fourth tab plate 53 a is disposed on the edge of the second holder 13 , and has a plurality of fourth tab protrusions 53 b protruding from one side thereof, which can be electrically connected to a plurality of unit battery cells 20 .

[0088] A second fixing piece 53c that extends in a bent state toward the side of the second holder 13 can protrude from the edge of the fourth tab plate 53a.

[0089] The second fixing piece 53c protrudes from the edge of the fourth tab plate 53a and can be inserted into the second insertion groove 13b formed in the side surface of the second holder 13.

[0090] The second fixing pieces 53c protrude from the edge of the fourth tab plate 53a in a number corresponding to the number of the second insertion grooves 13b, and can be inserted into the second insertion grooves 13b.

[0091] The second fixing piece 53c may have a second fixing hole 53d formed therein, which has an elongated hole shape.

[0092] The second fixing hole 53d is for fixing the second connection protrusion 63b of the busbar 60, which is inserted into the second insertion groove 13b together with the second fixing piece 53c, to the side of the second holder 13 using a fastening member such as a bolt member.

[0093] The second fixing hole 53d is formed in an elongated hole shape, and when fixing using a fastening member, the installation position of the second connecting protrusion 63b can be appropriately changed.

[0094] A second guide piece 53e protrudes from the edge of the fourth tab plate 53a, so that the fourth tab plate 53a can be stably positioned on the second holder 13.

[0095] The second guide piece 53e can be bent at an angle of approximately 90 degrees so as to come into surface contact with the side surface of the second holder 13 at the edge of the fourth tab plate 53a.

[0096] The second guide piece 53e protrudes from the edge of the fourth tab plate 53a at a position between the plurality of second fixing pieces 53c, and can come into surface contact with the side surface of the second holder 13. Therefore, the fourth connection tab 53 can be fixed in a stably positioned state at the edge position of the second holder 13 by the guiding action of the plurality of second guide pieces 53e.

[0097] The second guide piece 53e may protrude in a rounded shape from the edge of the fourth tab plate 53a to minimize interference with adjacent components.

[0098] Meanwhile, the bus bars 60 are provided on the first holder 11 and the second holder 13, respectively, and can be installed so as to electrically connect the BMS circuit 90 and the unit battery cells 20.

[0099] More specifically, the bus bar 60 may include a first bus bar 61 that electrically connects the third connection tab 51 and the BMS circuit 90, and a second bus bar 63 that electrically connects the fourth connection tab 53 and the BMS circuit 90.

[0100] FIG. 8 is a perspective view that schematically illustrates a state in which the first bus bar of FIG. 7 is connected to a third connection tab.

[0101] As shown in FIG. 8, the first bus bar 61 extends along the first direction (x-axis direction) on the side of the first holder 11, and a portion of the first bus bar 61 may have a bent extension portion 61a formed thereon that protrudes so as to be inserted into a plurality of first insertion grooves 11b of the first holder 11.

[0102] The first bus bar 61 extends a long length along the side of the first holder 11 in a first direction, and has multiple bent extension portions 61a protruding from one edge, and a first connection protrusion 61b protruding from the other edge for connecting to the BMS circuit 90.

[0103] The bent extension portion 61a may have a second fastening hole 61d formed therein.

[0104] The second fastening hole 61d can be formed in the bent extension portion 61a so that when the bent extension portion 61a is inserted into the first insertion groove 11b formed in the first holder 11, it is connected to the first fixing hole 51d formed in the first fixing piece 51c.

[0105] Therefore, when the bent extension portion 61a is inserted into the first insertion groove 11b and is in face contact with the first fixing piece 51c, the fastening member passes through the first fixing hole 51d and the second fastening hole 61d to be fastened to the first holder 11 and fixed to the second holder 13.

[0106] The bent extension portions 61 a can protrude from the edge of the first bus bar 61 in the same number as the number of first insertion grooves 11 b formed on the side surface of the first holder 11 .

[0107] That is, the bent extension portion 61a can be inserted into the first insertion groove 11b and electrically connected to the first fixing piece 51c in a state of surface contact with the first fixing piece 51c.

[0108] The first bus bar 61 can have a first connecting protrusion 61b protruding from the edge thereof.

[0109] The first connecting protrusion 61b has one side connected to the edge of the first bus bar 61 and the other side extending upwardly of the second holder 13 and capable of being electrically connected to the BMS circuit 90.

[0110] On the other hand, by electrically connecting the fourth connection tab 53 and the BMS circuit 90, a portion of the second bus bar 63 can be inserted in the longitudinal direction into the second insertion groove 13b into which the second fixing piece 53c is inserted, and the second bus bar 63 can be fixed by a fastening member.

[0111] FIG. 9 is a perspective view schematically illustrating a state in which a second bus bar according to an embodiment of the present invention is connected to a fourth connection tab, and FIG. 10 is a perspective view of a main part schematically illustrating a state in which the second bus bar of FIG. 9 is coupled to a second holder.

[0112] As shown in Figures 9 and 10, the second bus bar 63 extends along the first direction on the side of the second holder 13, and a bent portion 63a that is inserted into the second insertion groove 13b of the second holder 13 may be formed on part of the surface.

[0113] The bent portion 63a allows a portion of the second bus bar 63 to be bent in a second direction (y-axis direction) perpendicular to the first direction and inserted into the second insertion groove 13b.

[0114] The bent portion 63a may have a second fastening hole 63d formed therein that communicates with the second fixing hole 53d formed in the fourth connection tab 53 when inserted into the second insertion groove 13b.

[0115] Fastening members such as bolt members can be inserted into such first fixing holes 51d and second fastening holes 63d to fix the second holder 13, and the second bus bar 63 can be fixed to the second holder 13 while being electrically connected to the fourth connection tab 53.

[0116] In other words, the fastening member is fastened to the second holder 13 after passing through the first fixing hole 51d and the second fastening hole 63d, thereby stably fixing the second bus bar 63 to the side of the second holder 13.

[0117] The first fixing hole 51d and the second fastening hole 63d are elongated holes formed in the fourth connection tab 53 and the bending portion 63a, respectively, which allows adjustment of the position at which the second bus bar 63 is fixed to the side of the second holder 13, allowing for more stable installation of the second bus bar 63.

[0118] Such second bus bar 63 may have a second connection protrusion 63b protruding from one edge thereof, which extends to the top of second holder 13 and is electrically connected to BMS circuit 90.

[0119] The second connection protrusion 63b has one side electrically connected to the edge of the second bus bar 63 and the other side extending to the top of the second holder 13 and can be electrically connected to the BMS circuit 90.

[0120] As described above, the bus bar 60 includes the first bus bar 61 that connects the third connection tab 51 and the BMS circuit 90, and the second bus bar 63 that connects the fourth connection tab 53 and the BMS circuit 90. This allows the multiple unit battery cells 20 housed in the holder 10 to be stably electrically connected to each other and to the BMS circuit 90.

[0121] On the other hand, a first support portion 70 can be formed that protrudes in multiple directions from the upper portion of the second holder 13 and supports the BMS circuit 90, and a second support portion 80 can be formed that protrudes from the upper portion of the second holder 13 and supports the BMS circuit 90 while being connected to the second connection protrusion 63b of the second bus bar 63.

[0122] The first support portion 70 may be a plurality of support protrusions that protrude from the second holder 13 and support the BMS circuit 90 while spaced apart from the second holder 13. Hereinafter, the first support portion and the support protrusions will be referred to by the same reference numerals.

[0123] The support protrusions 70 protrude in multiple portions of the same length from the top of the second holder 13, and can support the BMS circuit 90 on the top of the second holder 13 at an appropriate distance.

[0124] The second support portion 80 may include a fastening member 81 that passes through the second connection protrusion 63b of the second bus bar 63 and is fixed to the second holder 13, and a fixing portion 83 that supports the BMS circuit 90.

[0125] The fastening member 81 can be installed so as to be fixed to the second holder 13 so as to pass through the BMS circuit 90 in the third direction (z-axis direction).

[0126] The fastening member 81 can be installed so as to fix the second connecting protrusion 63b of the second bus bar 63 and a support plate 83a constituting a fixing portion 83, which will be described later, to each other.

[0127] The fixing portion 83 may include a support plate 83a having an insertion hole through which the fastening member 81 passes, and a plurality of insertion protrusions 83b that protrude from the edge of the support plate 83a and are inserted and fixed into the BMS circuit 90.

[0128] The support plate 83a is located on the upper surface of the second holder 13, and a plurality of insertion protrusions 83b can protrude from the edge.

[0129] The insertion protrusions 83b protrude in multiple ways from the edge of the support plate 83a and are inserted and fixed into the BMS circuit 90, and can protrude into the support plate 83a so as to fix the BMS circuit 90 in a fixed position on top of the second holder 13.

[0130] In this way, the support protrusions 70 and the fixing portions 83 are provided on the upper portion of the second holder 13 to support the BMS circuit 90, so that the BMS circuit 90 can be stably fixed.

[0131] As described above, in the secondary battery pack 100 of this embodiment, the third connection tab 51 and the fourth connection tab 53 are electrically connected to the bus bar 60 at the side positions of the holder 10, and the bus bar 60 is electrically connected to the BMS circuit 90 at the upper position of the holder 10, thereby enabling stable connection of the electrical connections and improving durability.

[0132] Although the preferred embodiment of the present invention has been described above, the present invention is not limited thereto, 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 to be understood that these modifications also fall within the scope of the present invention. [Explanation of symbols]

[0133] 10 Holder 11 First Holder 11a First Storage Space 11b First insertion groove 13 Second Holder 13a Secondary Storage Space 13b Second insertion groove 20 unit battery cells 30 First Connection Tab 31 First tab plate 33 First tab protrusion 40 Second Connection Tab 41 Second tab plate 43 Second tab protrusion 50 Busbar connection tabs 51 Third Connection Tab 51a Third tab plate 51b Third tab protrusion 51c First fixed piece 51d First fixing hole 51e First guide piece 53 Fourth Connection Tab 53a Fourth Tab Plate 53b Fourth tab protrusion 53c Second fixed piece 53d Second fixing hole 53e Second guide piece 60 Busbar 61 First bus bar 61a Bend extension 61b First connecting protrusion 61c First fastening hole 61d Second fastening hole 63 Second busbar 63a Bend part 63b Second connecting protrusion 63c First fastening hole 63d Second fastening hole 70 First support part 80 Second support 81 Fastening members 83 Fixed part 83a Support plate 83b Insertion protrusion 90 BMS circuit 100 Secondary battery pack

Claims

1. a holder having a plurality of storage spaces formed therein; a plurality of unit battery cells inserted into the plurality of accommodating spaces; battery connection tabs in the holder that electrically connect the plurality of unit battery cells; a plurality of bus bar connection tabs coupled to the upper and lower edges of the holder, electrically connected to some of the unit battery cells, and having bent fixing pieces protruding from the side of the holder; a bus bar including a connection protrusion electrically connected to the fixing piece of the bus bar connection tab and extending in a bent manner to an upper portion of the holder; a BMS circuit provided on an upper portion of the holder and electrically connected to the connection protrusion; a secondary battery pack including:

2. The battery connection tab a plurality of first connection tabs electrically connecting lower portions of the plurality of unit battery cells at a lower portion of the holder; a plurality of second connection tabs electrically connecting upper portions of the plurality of unit battery cells at an upper portion of the holder; The secondary battery pack according to claim 1 , comprising:

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

4. a first insertion groove into which the fixing piece of the bus bar connection tab is inserted and fixed is formed on a side surface of the first holder; The secondary battery pack according to claim 3 , wherein the first insertion groove is formed in a plurality of portions along a first direction on a side surface of the first holder.

5. a second insertion groove into which the fixing piece of the bus bar connection tab is inserted and fixed is formed on a side surface of the second holder; The secondary battery pack according to claim 4 , wherein the second insertion groove is formed in a plurality of grooves along the first direction on the side surface of the second holder.

6. The first connection tab a plurality of first tab plates disposed on a lower portion of the first holder; a plurality of first tab protrusions protruding from an edge of the first tab plate and electrically connected to the unit battery cells; Including, The second connection tab is a plurality of second tab plates disposed on an upper portion of the second holder; a plurality of second tab protrusions protruding from an edge of the second tab plate and electrically connected to the unit battery cells; The secondary battery pack according to claim 5 , comprising:

7. The busbar connection tabs are a third connection tab electrically connected to the plurality of unit battery cells at a lower edge of the first holder, and a portion of the third connection tab extending from the third connection tab to be electrically connected to the BMS circuit; a fourth connection tab electrically connected to the plurality of unit battery cells at an upper edge of the second holder and extending partially to be electrically connected to the BMS circuit; The secondary battery pack according to claim 6 , comprising:

8. The third connection tab is a third tab plate disposed on a lower edge of the first holder; a plurality of third tab protrusions protruding from one edge of the third tab plate and electrically connected to the unit battery cells; a first fixing piece formed with first fixing holes, the first fixing piece being bent at the other edge of the third tab plate toward a side surface of the first holder, the first fixing piece being inserted into the first insertion grooves, and being fixed by fastening members; Including, The secondary battery pack according to claim 7 , wherein a first guide piece that is in surface contact with a side surface of the first holder protrudes from one edge of the third tab plate.

9. The fourth connection tab a fourth tab plate disposed on an upper edge of the second holder; a plurality of fourth tab protrusions protruding from one edge of the fourth tab plate and electrically connected to the unit battery cells; a second fixing piece formed with second fixing holes, the second fixing piece being bent toward a side surface of the second holder at the other edge of the fourth tab plate, the second fixing piece being inserted into the second insertion grooves, and fixed by fastening members; Including, The secondary battery pack according to claim 8 , wherein a second guide piece that is in surface contact with a side surface of the first holder protrudes from one edge of the fourth tab plate.

10. The bus bar is a first bus bar electrically connecting the third connection tab and the BMS circuit; a second bus bar electrically connecting the fourth connection tab and the BMS circuit; The secondary battery pack according to claim 9 , comprising:

11. The first bus bar includes:

11. The secondary battery pack of claim 10, wherein a bent extension portion is formed on a side surface of the first holder, the bent extension portion extending along the first direction and partially protruding to be inserted into the plurality of first insertion grooves of the first holder.

12. The secondary battery pack of claim 11 , wherein the bent extension portion has a second fastening hole formed therein, the second fastening hole communicating with the first fastening hole and fastening the secondary battery pack to the first holder with a fastening member.

13. 13. The secondary battery pack according to claim 12, wherein a first connection protrusion protrudes from one edge of the first bus bar, the first connection protrusion extending to an upper portion of the second holder and electrically connected to the BMS circuit.

14. The second bus bar includes:

13. The secondary battery pack according to claim 12, wherein a bent portion is formed on a side surface of the second holder, the bent portion extending along the first direction and being inserted into the second insertion groove of the second holder.

15. 15. The secondary battery pack of claim 14, wherein the bent portion has a second fastening hole formed therein, the second fastening hole communicating with the second fixing hole of the fourth connection tab when the fourth connection tab is inserted into the second insertion groove, and through which a fastening member is fixed to the second holder.

16. 16. The secondary battery pack according to claim 15, wherein a second connection protrusion protrudes from one edge of the second bus bar, the second connection protrusion extending to an upper portion of the second holder and electrically connected to the BMS circuit.

17. a plurality of first support portions protruding from an upper portion of the second holder and supporting the BMS circuit; a second support portion that protrudes from an upper portion of the second holder and supports the BMS circuit in a state where the second support portion is connected to the second connection protrusion of the second bus bar; The secondary battery pack according to claim 16 , further comprising:

18. 18. The secondary battery pack according to claim 17, wherein the first support portion is a plurality of support protrusions that protrude from the second holder and support the BMS circuit in a state spaced apart from the second holder.

19. The second support portion includes: a fastening member that passes through the BMS circuit and is fixed to the holder; a support plate having an insertion hole into which the fastening member is inserted, and a fixing portion including a plurality of insertion protrusions protruding from an edge of the support plate and inserted and fixed to the BMS circuit; The secondary battery pack according to claim 18 , comprising:

20. The secondary battery pack according to claim 19 , wherein the fastening member passes through the second connection protrusion of the second bus bar and is fixed to the second holder.

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