Rechargeable battery pack

Abstract

There is provided a rechargeable battery pack including: a holder having a plurality of accommodation spaces formed therein; a plurality of unit battery cells inserted into the plurality of accommodating spaces; a battery connection tab electrically connecting the plurality of unit battery cells in the holder; a plurality of bus bar connection tabs coupled to an upper edge and a lower edge of the holder and electrically connected to a portion of the plurality of unit battery cells, and including a fixing member protruding from an edge of the bus bar connection tab and bent to a side surface of the holder; a bus bar electrically connected to the fastener of the bus bar connection tab, and including a connection protrusion extending while being bent to an upper portion of the holder; and a BMS circuit mounted on an upper portion of the holder and electrically connected to the connection protrusion.

Description

Technical Field

[0001] A rechargeable battery pack that enables a stable electrical connection between a bus bar and a BMS circuit and has improved durability. Background Art

[0002] Generally, rechargeable batteries that can be repeatedly charged and discharged are widely used as batteries, and the batteries can be a power source for wireless mobile devices. The batteries can also attract attention as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs), and electric vehicles (EVs) and hybrid electric vehicles (HEVs) are being proposed as potential solutions to air pollution from conventional gasoline vehicles or conventional diesel vehicles that use fossil fuels. Summary of the Invention

[0003] An embodiment relates to a rechargeable battery pack, the rechargeable battery pack including: a holder having a plurality of accommodation spaces formed therein; a plurality of unit battery cells inserted into the plurality of accommodation spaces; battery connection tabs that can electrically connect the plurality of unit battery cells in the holder; a plurality of bus bar connection tabs that can be coupled to upper and lower edges of the holder and can be electrically connected to some of the plurality of unit battery cells, and can include fixing members protruding from an edge of the bus bar connection tab and bent to a side surface of the holder; a bus bar that can be electrically connected to the fixing members of the bus bar connection tabs, and can include connection protrusions extending while being bent to an upper portion of the holder; and a BMS circuit mounted on an upper portion of the holder and electrically connected to the connection protrusions.

[0004] An embodiment may include battery connection tabs, the battery connection tabs including a plurality of first connection tabs and a plurality of second connection tabs, the plurality of first connection tabs electrically connecting lower portions of the plurality of unit battery cells at a lower portion of the holder, and the plurality of second connection tabs electrically connecting upper portions of the plurality of unit battery cells at an upper portion of the holder.

[0005] An embodiment may include a holder, the holder including a first holder and a second holder, a plurality of first accommodation spaces accommodating a part of the unit battery cells being formed in the first holder, and wherein the first connection tabs are mounted at a bottom of the first holder, the second holder is mounted on an upper portion of the first holder, and a plurality of second accommodation spaces accommodating another part of the unit battery cells are formed in the second holder, and wherein the second connection tabs are mounted at an upper portion of the second holder.

[0006] The embodiment may include a plurality of first insertion slots into which the fixing member of the bus bar connection tab is inserted and fixed, and the plurality of first insertion slots are formed on the side surface of the first holder, and the plurality of first insertion slots are formed on the side surface of the first holder along a first direction.

[0007] The embodiment may include second insertion slots into which the fixing member of the bus bar connection tab is inserted and fixed and which are formed on the side surface of the second holder, and the plurality of second insertion slots are formed as a plurality on the side surface of the second holder along the first direction.

[0008] The embodiment may include a first connection tab and a second connection tab. The first connection tab includes a plurality of first connection plates at the bottom of the first holder and a plurality of first tab protrusions protruding from the edge of the first connection plate and electrically connected to the unit battery cells. The second connection tab includes a plurality of second connection plates above the second holder and a plurality of second tab protrusions protruding from the edge of the second connection plate and electrically connected to the unit battery cells.

[0009] The embodiment may include a bus bar connection tab which includes a third connection tab and a fourth connection tab. The third connection tab is electrically connected to a plurality of unit battery cells at the lower edge of the first holder and partially extends and is electrically connected to the BMS circuit. The fourth connection tab is electrically connected to a plurality of unit battery cells at the upper edge of the second holder and partially extends and is electrically connected to the BMS circuit.

[0010] The embodiment may include a third connection tab which includes: a third connection plate on the lower edge of the first holder; a plurality of third tab protrusions protruding from one edge of the third connection plate and electrically connected to the unit battery cells; and a first fixing member bent from the other edge of the plurality of third connection plates toward the side surface of the first holder, inserted into the plurality of first insertion slots, and having a first fixing hole fixed by a fastening member; and a first guide member in surface contact with the side surface of the first holder and protruding from one edge of the third connection plate.

[0011] The embodiment may include a fourth connection tab which includes: a fourth connection plate on the upper edge of the second holder; a plurality of fourth tab protrusions protruding from one edge of the fourth connection plate and electrically connected to the unit battery cells; a second fixing member bent from the other edge of the fourth connection plate toward the side surface of the second holder, and inserted into the plurality of second insertion slots and having a second fixing hole fixed by a fastening member; and a second guide member in surface contact with the side surface of the first holder and protruding from one edge of the fourth connection plate.

[0012] An embodiment may include busbars, where the busbars include a first busbar that electrically connects a third connection tab and a BMS circuit and a second busbar that electrically connects a fourth connection tab and the BMS circuit.

[0013] An embodiment may include a first busbar, where the first busbar includes a bent extension portion that extends in a second direction perpendicular to a first direction at a side surface of a first holder and is inserted into a plurality of first insertion slots of the first holder and is formed in a part of the first busbar.

[0014] An embodiment may include a first fastening hole that communicates with a first fixing hole, is fixed to the first holder by a fastening member, and is formed in the bent extension portion.

[0015] An embodiment may include a first connection protrusion that extends to an upper portion of a second holder and is electrically connected to the BMS circuit and protrudes from an edge of the first busbar.

[0016] An embodiment may include a second busbar, where the second busbar includes a bent portion that extends from a side surface of the second holder in the second direction and is inserted into a second insertion slot of the second holder and is formed in a part of the surface of the second busbar.

[0017] An embodiment may include a second fastening hole, where the fastening member is fixed to the second holder through the second fastening hole, and the second fastening hole communicates with a second fixing hole of the fourth connection tab while the bent portion is inserted into the second insertion slot and the second fastening hole is formed in the bent portion.

[0018] An embodiment may include a second connection protrusion that extends to an upper portion of the second holder, is a second connection protrusion electrically connected to the BMS circuit, and protrudes from an edge of the second busbar.

[0019] An embodiment may include a plurality of first support portions that protrude from an upper portion of the second holder and support the BMS circuit, and a second support portion that protrudes on the upper portion of the second holder and supports the BMS circuit while being connected to the second connection protrusion of the second busbar.

[0020] An embodiment may include a plurality of first support portions that protrude into the second holder and support the BMS circuit at a certain distance from the second holder.

[0021] An embodiment may include a second support portion, where the second support portion includes a fastening member and a fixing portion. The fastening member passes through the BMS circuit and is fixed to the holder. The fixing portion includes: a support plate in which an insertion hole is formed, and the fastening member is inserted into the insertion hole; and a plurality of insertion protrusions that protrude at an edge of the support plate and are inserted and fixed into the BMS circuit.

[0022] The embodiment may include a second connection projection passing through the second bus bar and a fastening member fastened to the second holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Features will become apparent to those skilled in the art by describing exemplary embodiments in detail with reference to the drawings.

[0024] Figure 1 is a schematic perspective view of a rechargeable battery pack according to an exemplary embodiment.

[0025] Figure 2 schematically shows Figure 1 a disassembled perspective view of a main part in a state where the BMS circuit of the rechargeable battery pack in

[0026] Figure 3 schematically shows Figure 1 a disassembled perspective view of the rechargeable battery pack of

[0027] Figure 4 is a schematic perspective view showing a third connection tab according to an exemplary embodiment.

[0028] Figure 5 schematically shows the formation of Figure 4 a perspective view of a main part of a portion of a third tab projection forming the third connection tab in

[0029] Figure 6 is a schematic perspective view showing a fourth connection tab according to an exemplary embodiment.

[0030] Figure 7 is a perspective view of a main part schematically showing a state where a first bus bar is separated from a first holder according to an embodiment.

[0031] Figure 8 schematically shows Figure 7 a perspective view of a state where the first bus bar of

[0032] Figure 9 is a schematic perspective view showing a state where a second bus bar is connected to a fourth connection tab according to an exemplary embodiment.

[0033] Figure 10 schematically shows Figure 2 a perspective view of a main part of a state where the second bus bar in DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings. However, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the exemplary embodiments to those skilled in the art.

[0035] In the drawings, the dimensions of layers and regions may be exaggerated for clarity. It will also be understood that when a layer or element is referred to as being “on” another layer or substrate, the layer or element can be directly on the other layer or substrate, or intervening layers or intervening elements may also be present. Additionally, it will be understood that when a layer is referred to as being “under” another layer, the layer can be directly under the other layer, and one or more intervening layers may also be present. Further, it will be understood that when a layer is referred to as being “between” two layers, the layer can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals always refer to like elements.

[0036] Hereinafter, the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. As will be recognized by those skilled in the art, the described embodiments may be modified in various different ways, all without departing from the scope of the present disclosure. The drawings and the description are to be regarded as illustrative rather than restrictive. Throughout the specification, like reference numerals represent like elements.

[0037] Figure 1 is a schematic perspective view of a rechargeable battery pack according to an example embodiment. Figure 2 schematically shows Figure 1 a disassembled perspective view of a main part in a state where the BMS circuit of the rechargeable battery pack in Figure 3 schematically shows Figure 1 a disassembled perspective view of the rechargeable battery pack of

[0038] As Figures 1 to 3As shown in , the rechargeable battery pack 100 according to an exemplary embodiment may include: a holder in which a plurality of accommodation spaces 11a, 13a are formed; a plurality of unit battery cells 20 inserted into the plurality of accommodation spaces 11a, 13a; 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 electrically connected to some of the plurality of unit battery cells 20 by being coupled to the upper and lower edges of the holder and having protruding fixing parts bent from the side surface of the holder 10; a bus bar 60 including fixing parts 51c, 53c electrically connected to the bus bar connection tabs 50 and having connection protrusions 61b and 63b extending in a bent manner to the upper part of the holder 10; and a BMS circuit 90 mounted on the upper part of the holder 10 and electrically connected to the connection protrusions.

[0039] A plurality of accommodation spaces 11a, 13a may be formed inside the holder 10, and a plurality of unit battery cells 20 may be accommodated inside the plurality of accommodation spaces 11a, 13a.

[0040] A plurality of accommodation spaces 11a, 13a may be formed inside the holder 10 and may be formed in columns and rows over the entire area of the holder 10. Accordingly, a plurality of unit battery cells 20 may be inserted into the holder 10 in a plurality of columns and rows. The holder 10 may include a first holder 11 and a second holder 13 that accommodate the plurality of unit battery cells 20.

[0041] In the first holder 11, a plurality of first accommodation spaces 11a in which a part of the unit battery cell 20 may be accommodated therein may be formed, and the first connection tab 30 may be mounted at the bottom. The first holder 11 may be formed with a plurality of columns and rows in the first accommodation spaces 11a such that a part of the plurality of unit battery cells 20 may be accommodated therein.

[0042] A first insertion groove 11b (see Figure 7 ) into which the first fixing part 51c is inserted and fixed may be formed on the side surface of the first holder 11. The first insertion groove 11b may be formed as a plurality along a first direction (x-axis direction) on the side surface of the first holder 11, and thus the first fixing part 51c of the third connection tab 51 constituting the bus bar connection tab 50 to be described later may be inserted. This will be described in more detail when the third connection tab 51 is described below. Meanwhile, the battery connection tabs 30, 40 electrically connecting the plurality of unit battery cells 20 may be mounted in the holder 10.

[0043] The battery connection tabs 30, 40 may include a plurality of first connection tabs 30 and a plurality of second connection tabs 40. The first connection tabs 30 may electrically connect the lower portions of the plurality of unit battery cells 20 from the lower part of the holder 10, and the second connection tabs 40 may electrically connect the upper portions of the plurality of unit battery cells 20 from the upper part of the holder 10. The first connection tabs 30 may be mounted at the bottom of the first holder 11 and may electrically connect the plurality of unit battery cells 20.

[0044] The first connection tabs 30 may include a plurality of first connection plates 31 in the lower part of the first holder 11 and a plurality of first tab protrusions 33 protruding from the edges of the plurality of first connection plates 31 and electrically connected to the unit battery cells 20.

[0045] The plurality of first connection plates 31 may be spaced apart from each other and fixed to the lower part of the first holder 11, and they may be electrically connected to the portions of the plurality of unit battery cells 20 in the lower part of the first holder 11. The plurality of first tab protrusions 33 may protrude at the edges of the plurality of first connection plates 31. The plurality of first tab protrusions 33 may protrude along the edges of the plurality of first connection plates 31 and may be electrically connected to the unit battery cells 20.

[0046] Optionally, the plurality of first tab protrusions 33 may protrude on each of the opposite sides of the plurality of first connection plates 31 according to the arrangement positions of the plurality of first connection plates 31, or may protrude at the edge positions on either side.

[0047] The second holder 13 may be mounted on the upper part of the first holder 11, and a plurality of second accommodation spaces 13a for accommodating the unit battery cells 20 together with the first holder 11 may be formed inside.

[0048] In the second holder 13, the plurality of second accommodation spaces 13a may be formed in a plurality of columns and rows so that a part of the plurality of unit battery cells 20 can be accommodated therein.

[0049] That is, the plurality of second accommodation spaces 13a may accommodate the unit battery cells 20 by communicating with the plurality of first accommodation spaces 11a in a state where the first holder 11 and the second holder 13 are positioned above and below each other. The second insertion groove 13b may be on one side of the second holder 13, and the second fixing member 53c may be inserted and fixed into the second insertion groove 13b.

[0050] The second insertion grooves 13b may be formed in a plurality along the first direction on the side surface of the second holder 13, and thus the second fixing members 53c of the fourth connection tabs 53 forming the bus bar connection tabs 50 to be described later may be inserted. This will be described in more detail when the fourth connection tabs 53 are described below.

[0051] The second connection tab 40 can be installed in the upper part of the second holder 13 and electrically connect a plurality of unit battery cells 20. The second connection tab 40 can include a plurality of second connection plates 41 on the second holder 13 and a plurality of second tab protrusions 43 protruding from the edges of the plurality of second connection plates 41 and electrically connected to the unit battery cells 20.

[0052] The plurality of second connection plates 41 can be fixed to the upper part of the second holder 13 and spaced apart from each other, and can be electrically connected to the parts of the plurality of unit battery cells 20 in the upper part of the second holder 13. The plurality of second tab protrusions 43 can protrude at the edges of the plurality of second connection plates 41.

[0053] The plurality of second tab protrusions 43 can protrude along the edges of the plurality of second connection plates 41 and be electrically connected to the unit battery cells 20. According to the positions of the plurality of second connection plates 41, the plurality of second tab protrusions 43 can protrude on both sides of the plurality of second connection plates 41, and can also protrude at the edge positions on either side.

[0054] The above-mentioned first connection tab 30 and second connection tab 40 can be installed on the first holder 11 and the second holder 13 respectively, and thus the plurality of unit battery cells 20 can be electrically connected to each other.

[0055] Meanwhile, a bus bar connection tab 50 that can electrically connect the first connection tab 30 and the second connection tab 40 can be installed in the first holder 11 and the second holder 13 to connect the unit battery cells 20 to the bus bar 60.

[0056] The bus bar connection tab 50 can be coupled to the edges of the first holder 11 and the second holder 13, and can be electrically connected to the upper and lower parts of some of the plurality of unit battery cells 20, and the first fixing member 51c and the second fixing member 53c can protrude from the edges of the bus bar connection tab 50 while being bent to the side surfaces of the first holder 11 and the second holder 13.

[0057] More specifically, the bus bar connection tab 50 can include a third connection tab 51 and a fourth connection tab 53. The third connection tab 51 is electrically connected to a plurality of unit battery cells 20 at the lower edge of the first holder 11 and partially extends and is electrically connected to the BMS circuit 90. The fourth connection tab 53 is electrically connected to a plurality of unit battery cells 20 at the upper edge of the second holder 13 and partially extends and is electrically connected to the BMS circuit 90.

[0058] Figure 4 is a schematic perspective view showing a third connection tab according to an exemplary embodiment. Figure 5is a perspective view schematically showing a main part of a third tab projection of a third connection tab formed in Figure 4 .

[0059] As shown in Figure 4 and Figure 5 , the third connection tab 51 may include a plurality of third connection plates 51a on the lower edge of the first holder 11. A plurality of third tab projections 51b may protrude from one edge of the plurality of third connection plates 51a and be electrically connected to the unit battery cells. The first fixing member 51c may bend in the direction of the side surface of the first holder 11 at the other edge of the plurality of third connection plates 51a, may be inserted into the plurality of first insertion grooves 11b, and may have a first fixing hole 51d fixed by a fastening member.

[0060] The plurality of third connection plates 51a may be at the edge of the first holder 11, and the plurality of third tab projections 51b may protrude on one side and be electrically connected to the plurality of unit battery cells 20.

[0061] The first fixing member 51c may extend in the direction of the side surface of the second holder 13 in a bent state and may protrude at the edge of the plurality of third connection plates 51a. The first fixing member 51c may protrude from the edge of the plurality of third connection plates 51a and may be inserted into the first insertion groove 11b formed on the side surface of the first holder 11.

[0062] The first fixing member 51c may protrude from the edge of the plurality of third connection plates 51a in a number corresponding to the plurality of first insertion grooves 11b and may be inserted into the first insertion groove 11b. The first fixing hole 51d having a slit shape may be formed in the first fixing member 51c.

[0063] The first fixing hole 51d may fix the bent extension portion 61a of the bus bar 60 to the side surface of the first holder 11 by a fastening member such as a bolt member. The bent extension portion 61a of the bus bar 60 may be inserted into the first insertion groove 11b together with the first fixing member 51c. Since the first fixing hole 51d may be in a slit shape, the mounting position of the bent extension portion 61a may be appropriately changed when fixed by the fastening member.

[0064] At the same time, the first guide member 51e may protrude at the edge of the plurality of third connection plates 51a so that the plurality of third connection plates 51a may be stably positioned on the first holder 11. The first guide member 51e may bend at the edge of the plurality of third connection plates 51a and may bend to approximately 90° to make surface contact with the side surface of the first holder 11.

[0065] The first guide member 51e can protrude from a position between the plurality of first fixing members 51c at the edge of the plurality of third connection plates 51a and can be in surface contact with the side surface of the first holder 11. Thus, the third connection tab 51 can be stably fixed at the edge position of the first holder 11 by the guiding action of the plurality of first guide members 51e.

[0066] The first guide member 51e can protrude in a rounded shape at the edge of the plurality of third connection plates 51a to minimize interference with adjacent components. At the same time, the fourth connection tab 53 can be electrically connected to the plurality of unit cell monomers 20 at the upper edge of the second holder 13, and a part of the fourth connection tab 53 can extend and be electrically connected to the BMS circuit 90.

[0067] Figure 6 is a schematic perspective view showing a fourth connection tab according to an exemplary embodiment. Figure 7 is a perspective view of a main part schematically showing a state in which a first bus bar is separated from a first holder according to an embodiment.

[0068] Refer to Figure 6 and Figure 7 More specifically, the fourth connection tab 53 can include a fourth connection plate 53a on the upper edge of the second holder 13, a plurality of fourth tab protrusions 53b that can protrude from one edge of the fourth connection plate 53a and be electrically connected to the unit cell monomers 20, and a second fixing member 53c. The second fixing member 53c can be bent from the other edge of the fourth connection plate 53a in the direction of the side surface of the second holder 13, can be inserted into the plurality of second insertion grooves 13b, and can have a second fixing hole 53d that can be fixed by a fastening member.

[0069] The fourth connection plate 53a can be placed at the edge of the second holder 13, and the plurality of fourth tab protrusions 53b can protrude on one side and be electrically connected to the plurality of unit cell monomers 20.

[0070] The second fixing member 53c can extend in a bent state in the direction of the side surface of the second holder 13 and can protrude at the edge of the fourth connection plate 53a. The second fixing member 53c can protrude from the edge of the fourth connection plate 53a and can be inserted into the second insertion groove 13b on the side surface of the second holder 13.

[0071] The second fixing member 53c may protrude from the edge of the fourth wiring board 53a in a number corresponding to the plurality of second insertion grooves 13b, and may be inserted into the second insertion grooves 13b. A second fixing hole 53d having a slit shape may be formed in the second fixing member 53c. The second fixing hole 53d may fix the bent portion 63a of the bus bar 60 to the side surface of the second holder 13 by a fastening member such as a bolt member, and the bent portion 63a of the bus bar 60 is inserted into the second insertion groove 13b together with the second fixing member 53c.

[0072] Since the second fixing hole 53d may be in a slit shape, when fixed using a fastening member, the mounting position of the bent portion 63a may be appropriately changed. Meanwhile, the second guide member 53e may protrude at the edge of the fourth wiring board 53a so that the fourth wiring board 53a is stably positioned on the second holder 13. The second guide member 53e may be bent at the edge of the fourth wiring board 53a and may be bent to approximately 90° to make surface contact with the side surface of the second holder 13.

[0073] The second guide member 53e may protrude from a position between the plurality of second fixing members 53c at the edge of the fourth wiring board 53a and may make surface contact with the side surface of the second holder 13. Accordingly, the fourth connection tab 53 may be stably fixed at the edge position of the second holder 13 by the guiding action of the plurality of second guide members 53e. The second guide member 53e may protrude in a rounded shape at the edge of the fourth wiring board 53a to minimize interference with adjacent components.

[0074] Meanwhile, the bus bar 60 may be respectively mounted in the first holder 11 and the second holder 13, and may enable the BMS circuit 90 and the unit battery cells 20 to be electrically connected. 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.

[0075] Figure 8 is a perspective view schematically showing Figure 7 the state where the first bus bar is connected to the third connection tab. As Figure 7 and 8 shown, the first bus bar 61 may extend from the side surface of the first holder 11 in a first direction (e.g., the x-axis direction), and a bent extension portion 61a may protrude (or extend) in a third direction (e.g., the z-axis direction) perpendicular to the first direction and be inserted into the plurality of first insertion grooves 11b of the first holder 11.

[0076] The first bus bar 61 may extend along a first direction to a long length from a side surface of the first holder 11. A plurality of bent extension portions 61a may protrude on one edge, and a first connection protrusion 61b that may be connected to the BMS circuit 90 may protrude on the other edge. A first fastening hole 61d may be formed in the bent extension portion 61a.

[0077] When the bent extension portion 61a is inserted into a first insertion groove 11b formed in the first holder 11, the first fastening hole 61d may be formed in the bent extension portion 61a to communicate with a first fixing hole 51d formed in the first fixing member 51c.

[0078] Therefore, since the fastening member may pass through the first fixing hole 51d and the first fastening hole 61d and may be fastened to the first holder 11 while the bent extension portion 61a is inserted into the first insertion groove 11b and is in surface contact with the first fixing member 51c, the bent extension portion 61a may be fixed to the first holder 11.

[0079] The bent extension portions 61a may protrude from an edge of the first bus bar 61 in the same number as the number of the first insertion grooves 11b formed on a side surface of the first holder 11. In an embodiment, the bent extension portions 61a may be inserted into the first insertion grooves 11b and may be electrically connected to the first fixing member 51c in a surface contact state. The first connection protrusion 61b may protrude at an edge of the first bus bar 61.

[0080] The first connection protrusion 61b may have one side connected to an edge of the first bus bar 61 and the other side extending in an upward direction of the second holder 13, and thus may be electrically connected to the BMS circuit 90 by a fastening member passing through a third fastening hole 61c formed therein.

[0081] Meanwhile, the second bus bar 63 may electrically connect the fourth connection tab 53 and the BMS circuit 90, and a part of the length direction of the second bus bar 63 may be inserted into a second insertion groove 13b into which the second fixing member 53c is inserted and may be fixed by a fastening member.

[0082] Figure 9 is a schematic perspective view showing a state in which a second bus bar is connected to a fourth connection tab according to an exemplary embodiment. Figure 10 Schematically shows Figure 2 a main part perspective view of a state in which the second bus bar in

[0083] As in Figure 9 and Figure 10As shown in the figure, the second bus bar 63 can extend from the side surface of the second holder 13 in the first direction, and the bending portion 63a can extend in the third direction (z-axis direction) to be inserted into the second insertion groove 13b of the second holder 13 and can be formed on a part of the surface.

[0084] The bending portion 63a can be inserted into the second insertion groove 13b by bending a part of the second bus bar 63 in the second direction (y-axis direction) perpendicular to the first direction.

[0085] While being inserted into the second insertion groove 13b, in the bending portion 63a, a second fastening hole 63d communicating with the second fixing hole 53d can be formed in the bending portion 63a.

[0086] A fastening member such as a bolt member can be inserted into the second fixing hole 53d and the second fastening hole 63d and can be fixed to the second holder 13, and thus the second bus bar 63 can be fixed to the second holder 13 while being electrically connected to the fourth connection tab 53.

[0087] In other words, the fastening member can be fastened to the second holder 13 while passing through the second fixing hole 53d and the second fastening hole 63d, and thus, the second bus bar 63 can be stably fixed to the side surface of the second holder 13.

[0088] Since the second fixing hole 53d and the second fastening hole 63d can have a slit shape at the fourth connection tab 53 and the bending portion 63a respectively, the position where the second bus bar 63 is fixed to the side surface of the second holder 13 can be adjusted, and thus the second bus bar 63 can be installed more stably.

[0089] In the second bus bar 63, a second connection projection 63b that can extend upward and be electrically connected to the BMS circuit 90 can protrude from one edge of the second holder 13.

[0090] One side of the second connection projection 63b can be electrically connected to the edge of the second bus bar 63, and the other side can extend to the upper part of the second holder 13 and be electrically connected to the BMS circuit 90.

[0091] As described above, since the bus bar 60 can include the first bus bar 61 connecting the third connection tab 51 and the BMS circuit 90 and the second bus bar 63 connecting the fourth connection tab 53 and the BMS circuit 90, the plurality of unit battery cells 20 accommodated in the holder 10 can be stably electrically connected to each other and stably connected to the BMS circuit 90.

[0092] Meanwhile, multiple first support portions 70 can protrude on the upper portion of the second holder 13 and can support the BMS circuit 90, and multiple second support portions 80 can protrude on the upper portion of the second holder 13 and support the BMS circuit 90 while being connected to the second connection protrusion 63b of the second bus bar 63. The multiple first support portions 70 can protrude into the second holder 13 and support the BMS circuit 90 while being spaced apart from the second holder 13.

[0093] Since the multiple first support portions 70 can protrude on the upper portion of the second holder 13 with the same length, the BMS circuit 90 can be supported in a state where it is appropriately separated at the upper portion of the second holder 13.

[0094] The multiple second support portions 80 can include a fastening member 81 that passes through a fourth fastening hole 63c in 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. The fastening member 81 can be installed to be fixed to the second holder 13 so as to penetrate the BMS circuit 90 in the width direction.

[0095] The fastening member 81 can fasten the second connection protrusion 63b of the second bus bar 63 and a support plate 83a to each other. The support plate 83a forms the fixing portion 83 and will be described later.

[0096] The fixing portion 83 can include a support plate 83a and multiple insertion protrusions 83b. An insertion hole through which the fastening member 81 passes is formed in the support plate 83a. The multiple insertion protrusions 83b can protrude at the edge of the support plate 83a and can be inserted into the BMS circuit 90 and fixed to the BMS circuit 90. The support plate 83a can be on the upper surface of the second holder 13, and the multiple insertion protrusions 83b can protrude at the edge.

[0097] The insertion protrusions 83b can protrude on the edge of the support plate 83a and can be inserted and fixed into the BMS circuit 90, and thus the insertion protrusions 83b can protrude on the support plate 83a to fix the BMS circuit 90 in a position on the upper portion of the second holder 13.

[0098] In this way, the multiple first support portions 70 and the fixing portion 83 can be installed on the upper portion of the second holder 13 to support the BMS circuit 90, thereby being able to stably fix the BMS circuit 90.

[0099] As described above, the rechargeable battery pack 100 of the present embodiment can electrically connect the third connection tab 51, the fourth connection tab 53, and the bus bar 60 at the side position of the holder 10, and can connect the bus bar 60 and the BMS circuit 90 at the upper position of the holder 10, making it possible to stably connect the electrical connection portions, thereby improving durability.

[0100] Although the present invention has been described in connection with presently considered practical embodiments, it will be understood that the invention is not limited to the disclosed embodiments. On the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

[0101] By summary and review, when a battery alternately performs charging and discharging, it may be necessary to effectively control the charging and discharging of the battery to maintain an appropriate operating state and performance. To this end, a battery management system (BMS) for managing the state and performance of the battery may be provided in the battery pack. The BMS can manage the battery by measuring the current, voltage, and temperature of the battery and recording the measured values in a memory.

[0102] The BMS can be electrically connected to the batteries in the rechargeable battery pack through a bus bar, and can manage the state and performance of the batteries. When connecting the BMS and the bus bar, a part of the bus bar can be bent and electrically connected to the BMS.

[0103] However, the first position where the bent portion of the bus bar is electrically connected to the BMS and the second position where the tab to which the bus bar is connected to the battery cell are connected may be unstable, so there may be a problem that the electrical connection may be unstable and the durability may deteriorate.

[0104] Example embodiments have been disclosed herein, and although specific terms have been employed, they have been used and are to be interpreted only in a general and descriptive sense and not for purposes of limitation. In some instances, as will be apparent to those of ordinary skill in the art at the time of filing the present application, unless otherwise expressly indicated, features, characteristics, and / or elements described in connection with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments. Accordingly, those skilled in the art will understand that various changes may be made in form and detail without departing from the scope of the present invention as set forth in the appended claims.

Claims

1. A rechargeable battery pack, comprising: a retainer having a plurality of accommodation spaces formed therein; A plurality of unit battery cells are inserted into the plurality of accommodation spaces; a battery connection tab electrically connecting the plurality of unit battery cells in the holder; a plurality of bus bar connection tabs coupled to upper and lower edges of the holder and electrically connected to some of the plurality of unit battery cells, and including fixing members protruding from edges of the bus bar connection tabs and bent to a side surface of the holder; a bus bar electrically connected to the fixture of the bus bar connection tab and including a connection protrusion extending while being bent to an upper portion of the retainer; as well as A BMS circuit is mounted on an upper portion of the holder and is electrically connected to the connection protrusion.

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

3. The rechargeable battery pack according to claim 2, wherein: The retainer comprises: a first holder in which a plurality of first accommodation spaces accommodating a portion of the unit battery cells are formed, and wherein the first connection tab is mounted at a bottom of the first holder; and A second holder is mounted on an upper portion of the first holder and a plurality of second accommodation spaces for accommodating another portion of the unit cells are formed in the second holder, and wherein the second connection tabs are mounted at an upper portion of the second holder.

4. The rechargeable battery pack according to claim 3, wherein: A plurality of first insertion grooves into which the fixing members of the bus bar connection tabs are inserted and fixed are formed on a side surface of the first retainer, and the plurality of first insertion grooves are formed on the side surface of the first retainer along a first direction.

5. The rechargeable battery pack according to claim 4, wherein: A plurality of second insertion grooves into which the fixing members of the bus bar connection tabs are inserted and fixed are formed on the side surface of the second holder, and the plurality of second insertion grooves are formed in plurality along the first direction on the side surface of the second holder.

6. The rechargeable battery pack according to claim 5, wherein: The first connecting terminal comprises: a plurality of first terminal blocks at a bottom of the first holder; and a plurality of first tab protrusions protruding at an edge of the first terminal plate and electrically connected to the unit battery cells, and The second connecting terminal piece comprises: a plurality of second wiring boards above the second retainer; and A plurality of second tab protrusions protrude at an edge of the second terminal plate and are electrically connected to the unit battery cells.

7. The rechargeable battery pack according to claim 6, wherein: The busbar connection lug comprises: a third connection tab electrically connected to the plurality of unit battery cells at a lower edge of the first holder and partially extending and electrically connected to the BMS circuit; and A fourth connection tab is electrically connected to the plurality of unit battery cells at an upper edge of the second holder and partially extends and is electrically connected to the BMS circuit.

8. The rechargeable battery pack according to claim 7, wherein: The third connecting terminal sheet comprises: a third terminal block on the lower edge of the first retainer; a plurality of third tab protrusions protruding on one edge of the third terminal plate and electrically connected to the unit battery cells; a first fixing piece bent from the other edge of the third wiring board toward the side surface direction of the first holder, inserted into the plurality of first insertion grooves, and having a first fixing hole fixed by a fastening member, and A first guide makes surface contact with the side surface of the first holder and protrudes from one edge of the third wiring board.

9. The rechargeable battery pack according to claim 8, wherein: The fourth connecting terminal piece comprises: a fourth terminal block on the upper edge of the second retainer; a plurality of fourth tab protrusions protruding on one edge of the fourth terminal plate and electrically connected to the unit battery cells; a second fixing piece bent from the other edge of the fourth wiring board toward the side surface direction of the second holder and inserted into the plurality of second insertion grooves and having a second fixing hole fixed by a fastening member, and A second guide makes surface contact with the side surface of the first holder and projects from one edge of the fourth wiring board.

10. The rechargeable battery pack according to claim 9, wherein: The bus bar comprises: a first bus bar electrically connecting the third connection tab and the BMS circuit; and The second bus bar electrically connects the fourth connection terminal piece and the BMS circuit.

11. The rechargeable battery pack according to claim 10, wherein: The first bus bar includes a bent extension portion extending in a second direction perpendicular to the first direction at the side surface of the first holder and inserted into the plurality of first insertion grooves of the first holder and formed in a portion of the first bus bar.

12. The rechargeable battery pack according to claim 11, wherein: A first fastening hole communicating with the first fixing hole is fixed to the first retainer using a fastening member, the first fastening hole being formed in the curved extension.

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

14. The rechargeable battery pack according to claim 12, wherein: The second bus bar includes a bent portion extending from the side surface of the second holder in the second direction and inserted into the second insertion groove of the second holder and formed in a portion of a surface of the second bus bar.

15. The rechargeable battery pack according to claim 14, wherein: A second fastening hole is communicated with the second fixing hole of the fourth connection tab while the bent portion is inserted into the second insertion groove and is formed in the bent portion, and a fastening member is fixed to the second retainer through the second fastening hole.

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

17. The rechargeable battery pack according to claim 16, further comprising: a plurality of first support portions protruding from an upper portion of the second holder and supporting the BMS circuit; as well as A second support portion protrudes on 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.

18. The rechargeable battery pack according to claim 17, wherein: The plurality of first support portions protrude to the second holder and support the BMS circuit at a distance from the second holder.

19. The rechargeable battery pack according to claim 18, wherein: The second supporting portion comprises: a fastening member passing through the BMS circuit and fixed to the holder; and The fixing part includes: a support plate in which an insertion hole is formed, and the fastening member is inserted into the insertion hole; and a plurality of insertion protrusions protruding at an edge of the support plate and inserted and fixed into the BMS circuit.

20. The rechargeable battery pack according to claim 19, wherein: The fastening member passes through the second connection protrusion of the second bus bar and is fastened to the second retainer.

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