Rechargeable battery pack

Abstract

Provided is a rechargeable battery pack. The rechargeable battery pack comprises: busbars electrically connecting a plurality of battery cells; a first connection part disposed adjacent to the busbars; and fuse assemblies, each configured such that opposite sides of a fuse are respectively connected to the busbar side and the first connection part side so as to transmit a signal sensed from a busbar to the first connection part, wherein each fuse assembly has stoppers caught on one side of respective strips of the first connection part.

Description

secondary battery pack

[0001] The present invention relates to a rechargeable battery pack, and more specifically, to a rechargeable battery pack in which a busbar is connected to a flexible flat cable (FFC).

[0002] Unlike primary batteries, rechargeable batteries are batteries that undergo repeated charging and discharging. Small-capacity rechargeable batteries are used in portable small electronic devices such as mobile phones, laptop computers, and camcorders.

[0003] Large-capacity and high-density secondary batteries are used as power sources for driving motors in hybrid and electric vehicles or for energy storage. Secondary batteries can be used by forming a secondary battery module comprising multiple battery cells connected in series and / or parallel, so as to drive a motor in, for example, a hybrid vehicle, which requires relatively high energy density.

[0004] The secondary battery module is equipped with a flexible printed circuit (FPC) that detects the voltage of the busbar and transmits the detection signal to check the charge status of the battery cells. In the FPC detection structure, the FPC is soldered to a separate tab, and the tab is welded to an aluminum (Al) busbar.

[0005] One embodiment of the present invention provides a secondary battery pack that applies a flexible flat cable (FFC) to detect voltage and transmit the detection signal to check the charge status of the battery cells through a busbar connecting the battery cells.

[0006] One embodiment of the present invention provides a secondary battery pack that enables accurate seating and contact of a tab to an FFC, prevents misalignment of a fuse assembly to an FFC, and improves the connection strength between the fuse assembly and the FFC.

[0007] One embodiment of the present invention provides a secondary battery pack that improves quality during solder bonding and enables verification of the quality of the solder bond when applying surface mount technology (SMT).

[0008] A secondary battery pack according to one embodiment of the present invention includes a bus bar that electrically connects a plurality of battery cells, a first connection part disposed adjacent to the bus bar, and a fuse assembly having both sides of a fuse connected to the bus bar side and the first connection part side, respectively, to send a signal detected by the bus bar to the first connection part, and a stopper that engages on one side of a strip of the first connection part.

[0009] The first connecting part is formed of a flexible flat cable (FFC), and the fuse assembly may include a first tap and a second tap that are spaced apart from each other and connected to the bus bar and the FFC, respectively, and a second connecting part that electrically connects the first tap and the second tap through the fuse.

[0010] The above FFC may include a first strip to an nth strip that extends in a first direction and has a gap in a second direction intersecting the first direction, and forms a circuit that transmits a detected signal.

[0011] The second tab may have a width formed in the first direction, a length formed in the second direction corresponding to the FFC, and an area set by the width and the length.

[0012] The stopper may include a first stopper to a nth stopper that is integrally provided with the second tab and supports one of the first strip to the nth strip, respectively, corresponding to one side of each of the first strip to the nth strip.

[0013] One of the first to nth strips is exposed, and the exposed strip can be electrically connected by solder paste to a portion connected to one of the first to nth stoppers corresponding to the second tab.

[0014] Each of the first to nth stoppers is cut and bent at the second tab to form a through hole in the second tab, is spaced apart along the elongation direction of the corresponding strip, and can correspond to a plurality of points of the strip that are exposed in response.

[0015] The second tab above can be surface-mounted with solder paste between the correspondingly exposed strips.

[0016] Among the first to nth strips, the strips not connected by solder paste can be electrically insulated from the second tab by the film of the FFC.

[0017] The second connection part is formed of a flexible printed circuit (FPC), and the fuse assembly may further include a plate that mechanically connects both sides of the FPC to the first tab and the second tab.

[0018] The first tab and the second tab are spaced apart from each other and each has a tab through-hole, and the FPC may have a corresponding through-hole corresponding to the tab through-hole.

[0019] The above plate can be formed from a plastic injection molded product.

[0020] The above plate is provided with a coupling projection corresponding to the corresponding through hole and the tap through hole, and after being coupled to the corresponding through hole and the tap through hole, it can be fixed by a hot stacking method.

[0021] The above fuse is provided with a first terminal and a second terminal at both ends, and when the coupling projection is coupled to the corresponding through hole and the tab through hole, the first terminal and the second terminal can be electrically connected to the first tab and the second tab.

[0022] The second connection part is formed of a flexible printed circuit (FPC), the first tap is connected to the bus bar, the second tap is connected to the FPC, the first tap and the second tap are connected to the FPC, and the fuse assembly may further include a reinforcing member that mechanically reinforces the electrical connection between the first tap and the second tap by the FPC.

[0023] The above fuse may have a width formed by repeating the sequence of the second direction, the positive first direction, the second direction, and the negative first direction with respect to the first direction in which the strip of the FFC extends and the second direction intersecting the first direction.

[0024] The above fuse has a first terminal and a second terminal provided at both ends formed as a rectangle having a width wider than the width, and can be connected to the first tab and the second tab.

[0025] The above second tab can be formed as a nickel tab.

[0026] A secondary battery pack according to one embodiment of the present invention may further include a bottom film covering the plurality of battery cells, and a top film disposed on the bus bar, the first connecting part, and the fuse assembly and attached to the bottom film by hot pressing.

[0027] The top film may have an opening corresponding to the opening of the bottom film.

[0028] In one embodiment, a secondary battery pack eliminates the intermediate step of forming modules with battery cells, thereby forming the pack directly with the battery cells. At this time, a busbar and a first connector (e.g., an FFC) are connected to a fuse assembly, and the first and second taps of the fuse assembly are connected to the busbar and the FFC (flexible flat cable), respectively, and the first and second taps are connected to the fuse of the fuse assembly, so that a cell contact system for detecting voltage according to the charge state of the battery cells can be implemented at a low cost. The FFC is connected to a Battery Management System (BMS).

[0029] In a secondary battery pack of one embodiment, the stopper of the second tab enables accurate seating and contact of the second tab with respect to the strip of the FFC. The strip of the second tab prevents misalignment of the fuse assembly with respect to the FFC and improves the connection strength between the fuse assembly and the FFC. Thus, the strip of the second tab enables connection to a low-cost single FFC without connecting to a high-cost double FFC.

[0030] In a secondary battery pack of one embodiment, the portion connected to the stopper at the second tab is pre-applied with solder paste to improve the quality of the solder joint during soldering, and when surface mount technology (SMT) is applied, the through hole of the second tab is used as a vision hole so that the quality of the solder joint can be verified.

[0031] FIG. 1 is a partially exploded perspective view of a secondary battery pack according to one embodiment of the present invention.

[0032] FIG. 2 is an exploded perspective view of the bottom film, bus bar, first connection part (as an example, FFC), fuse assembly and top film of FIG. 1.

[0033] FIG. 3 is a partial perspective view in which a busbar and an FFC placed on the bottom film of FIG. 1 are connected to a fuse assembly.

[0034] Figure 4 is a partial plan view of a busbar and an FFC placed on the bottom film of Figure 1 and connected to a fuse assembly.

[0035] Figure 5 is an exploded perspective view of the fuse assembly of Figures 3 and 4.

[0036] FIG. 6 is a plan view of the connection state between a fuse assembly and a first connection part (e.g., FFC).

[0037] Figure 7 is a cross-sectional view taken along the line Ⅶ-Ⅶ of Figure 6.

[0038] Figure 8 is a cross-sectional view taken along line VIII-VIII of Figure 6.

[0039] FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 6, in which a first stopper is caught on a first strip and the part connected to the first stopper is connected to solder paste.

[0040] FIG. 10 is a cross-sectional view taken along the line IX-IX of FIG. 6, showing a state in which a second stopper is caught on the second strip and the part connected to the second stopper is connected with solder paste.

[0041] FIG. 11 is a cross-sectional view taken along the line IX-IX of FIG. 6, in which the 12th stopper is caught on the 12th strip and the part connected to the 12th stopper is connected with solder paste.

[0042] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals have been used throughout the specification for identical or similar components.

[0043] FIG. 1 is a partially exploded perspective view of a secondary battery pack according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the bottom film, bus bar, first connection part (as an example, an FFC), fuse assembly and top film of FIG. 1. Referring to FIG. 1 and FIG. 2, a secondary battery pack of one embodiment includes a plurality of battery cells (10) formed as secondary batteries, a bus bar (30), a first connection part, and a fuse assembly (50). As an example, the first connection part may be formed of an FFC (flexible flat cable) (40) or a PCB (printed circuit board) (not shown) disposed adjacent to the bus bar (30).

[0044] Additionally, a secondary battery pack of one embodiment may further include a bottom film (20) and a top film (60). The bottom film (20) and the top film (60) may be replaced by a molding structure. For convenience, one embodiment is described including the bottom film (20) and the top film (60).

[0045] A secondary battery pack includes a cell contact system that contacts a plurality of battery cells (10). The cell contact system includes a bottom film (20), a bus bar (30), a flexible flat cable (FFC) (40), a fuse assembly (50), and a top film (60).

[0046] The secondary battery pack of one embodiment may have various structures, but a detailed description of this configuration is omitted and described as an example. A plurality of battery cells (10) are formed as prismatic secondary batteries and stacked in a first direction (x-axis direction).

[0047] The wide side of the battery cells (10) faces the first direction (x-axis direction), and the narrow side faces the second direction (y-axis direction) which intersects the first direction (x-axis direction). The battery cells (10) form a row along the first direction (x-axis direction) and arrange another row adjacently in the second direction (y-axis direction) to form two parallel rows overall. That is, the battery cells (10) form a secondary battery pack of two rows.

[0048] The bottom film (20) includes a busbar support (21) for connecting and insulating electrode terminals (not shown) of a plurality of battery cells (10), and a vent (22) for discharging gas discharged from a vent of the battery cells (10) to the outside. The vent (22) is spaced apart from the busbar support (21) in a second direction (y-axis direction).

[0049] The busbar support (21) covers the parts other than the electrode terminals of the battery cells (10) while supporting a busbar (30) that connects the electrode terminals of adjacent unit cells (10) in series or parallel by exposing the electrode terminals of the battery cells (10) in a third direction (z-axis direction) that intersects the second direction (y-axis direction).

[0050] A busbar (30) is placed on a bottom film (20) and electrically connects battery cells (10) through an opening (211) formed in the bottom film (20). An opening (211) is formed in the busbar support (21) to expose the electrode terminals of the battery cells (10).

[0051] A flexible flat cable (FFC) (40) is placed on a bottom film (20). The FFC (40) is attached to a busbar (30) and is configured to detect the voltage flowing according to the charge state of the battery cells (10) in the busbar (30), which electrically connects the electrode terminals of the battery cells (10), and to send the detection signal to a battery management system (BMS).

[0052] The fuse assembly (50) has both sides of the fuse (54) electrically connected to the busbar (30) and the FFC (40), respectively, so as to send a voltage signal detected by the busbar (30) to the FFC (40). The fuse assembly (50) will be described in detail below.

[0053] The top film (60) is placed on the busbar (30), FFC (40), and fuse assembly (50) and attached to the bottom film (20) by hot press. The top film (60) has an opening corresponding to the opening of the bottom film (20). That is, the opening of the top film (60) partially opens each part of the busbars (30) and the vent part (22). The busbar cover part (61) corresponding to the busbar support part (21) opens each part of the busbars (30) to enable heat dissipation of the busbars (30), and the vent part (62) prevents the operation of the bottom film (20) vent part (22) from being obstructed.

[0054] FIG. 3 is a partial perspective view of a busbar and an FFC connected to a fuse assembly placed on the bottom film of FIG. 1, FIG. 4 is a partial plan view of a busbar and an FFC connected to a fuse assembly placed on the bottom film of FIG. 1, FIG. 5 is an exploded perspective view of the fuse assembly of FIG. 3 and FIG. 5. Referring to FIG. 3 to FIG. 5, the fuse assembly (50) has both sides of a fuse (54) connected to the busbar (30) side and the FFC (40) side, respectively, to send a signal detected by the busbar (30) to the FFC (40), and is equipped with a stopper that engages on one side of the strip of the FFC (40).

[0055] To this end, the fuse assembly (50) includes a first tap (51), a second tap (52), and a second connection part. For example, the second connection part may be formed of a flexible printed circuit (FPC) (53) or a printed circuit board (PCB) (not shown).

[0056] The first tap (51) and the second tap (52) are spaced apart from each other in the second direction (y-axis direction) and are connected to the bus bar (30) and the FFC (40), respectively. The FPC (53) electrically connects the first tap (51) and the second tap (52) to each other and is equipped with a fuse (54). Thus, the bus bar (30) and the FFC (40) are electrically connected to each other through the fuse (54).

[0057] The first tap (51) is connected to the busbar (30) by welding. That is, the first tap (51) and the busbar (30) are electrically and mechanically connected. Below, the electrical and mechanical connection between the second tap (52) and the FFC (40) will be described.

[0058] FIG. 6 is a plan view of the connection state between a fuse assembly and a first connection part (e.g., FFC), FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6, and FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 6. Referring to FIG. 6 to FIG. 8, the first connection part, the FFC (40), is extended in a first direction (x-axis direction) and has a gap (G) in a second direction (y-axis direction) that intersects the first direction (x-axis direction), and includes a first strip (S1) to an n-th strip (Sn) as a strip that forms a circuit for transmitting a detected signal.

[0059] In one embodiment, the FFC (40) includes a first strip (S1) to a twelfth strip (S12). For convenience, in FIGS. 1, 2, 3, 4 and 6, a film (41, 42, see FIGS. 7 and 8) covering the first strip (S1) to the twelfth strip (S12) is not shown.

[0060] The second tab (52) has a width (W) formed in the first direction (x-axis direction), a length (L) formed in the second direction (y-axis direction) corresponding to the FFC (40), and an area (W*L) set by the width (W) and length (L). The area (W*L) allows the second tab (52) to be stably supported because it is positioned over the entire first strip (S1) to the twelfth strip (S12) and comes into contact with a large area.

[0061] The stopper is integrally provided in the second tab (52) and is provided with a first stopper (T1) to a n-th stopper (Tn) that supports one of the first strip (S1) to the n-th strip (Sn) respectively, corresponding to one side of each of the first strip (S1) to the n-th strip (Sn). One of the strips of the first strip (S1) to the n-th strip (Sn) is exposed, and the exposed strip is electrically connected by solder paste (SD) to a portion connected to one of the stoppers of the first stopper (T1) to the n-th stopper (Tn) corresponding in the second tab (52).

[0062] One of the first strip (S1) to the nth strip (Sn) is exposed, and the exposed strip is connected to the second tab (52) by applying solder paste (SD) to the portion connected to one of the first stoppers (T1) to the nth stoppers (Tn) corresponding to the second tab (52) and connecting to the second tab (52) by solder bonding.

[0063] Each of the first stopper (T1) to the nth stopper (Tn) is cut and bent at the second tab (52) to form a through hole in the second tab (52), is spaced apart along the elongation direction of the corresponding strip, and corresponds to a plurality of points of the strip that are correspondingly exposed. The through hole includes a first through hole (H1) to the nth through hole (Hn) corresponding to the first stopper (T1) to the nth stopper (Tn).

[0064] The area (W*L) based on width (W) and length (L), the first stopper (T1) to the nth stopper (Tn), and the first through holes (H1) to the nth through holes (Hn) enable the second tab (52) to be shared. That is, the second tab (52) can be connected to any one of the first strip (S1) to the twelfth strip (S12). One of the first stopper (T1) to the nth stopper (Tn) of the second tab (52) supports one side of one of the corresponding first strip (S1) to the twelfth strip (S12).

[0065] To this end, the solder paste (SD) in the second tab (52) must be provided corresponding to all of the first strip (S1) to the twelfth strip (S12). For convenience, the solder paste (SD) in the second tab (52) of the present embodiment is provided corresponding to only one of the first strip (S1) to the twelfth strip (S12).

[0066] The first through holes (H1) are spaced apart along the elongation direction (x-axis direction) of the corresponding first strip (S1) and are formed as long holes in the elongation direction. The second through holes (H2) are spaced apart along the elongation direction (x-axis direction) of the corresponding second strip (S2) and are formed as long holes in the elongation direction. Additionally, the third through holes (H3) to the twelfth through holes (H12) are likewise spaced apart along the elongation direction (x-axis direction) of the corresponding third strip (S3) to the twelfth strip (S12) and are formed as long holes in the elongation direction.

[0067] As each of the first through holes (H1) to the nth through holes (Hn) is formed long in the elongation direction (x-axis direction), the first stopper (T1) to the nth stopper (Tn), which is formed by cutting and bending the first through holes (H1) to the nth through holes (Hn), is also formed long along the elongation direction (x-axis direction).

[0068] FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 6, showing a state in which a first stopper is attached to a first strip and the portion connected to the first stopper is connected with solder paste. Referring to FIG. 7 through FIG. 9, the second tab (52) is surface-mounted with solder paste between corresponding exposed strips. Among the first strip (S1) to the nth strip (Sn), the strips that are not connected with solder paste are electrically insulated from the second tab (52) by an FFC film.

[0069] The second tab (52) is surface-mounted with solder paste (SD) between the first stopper (T1) and the first strip (S1) exposed corresponding to the portion connected thereto. For example, the second tab (52) may be formed as a nickel tab. The nickel tab enables smooth welding with the first strip (S1) to the nth strip (Sn), which are formed of copper.

[0070] To this end, the upper film (41) of the films (41, 42) of the FFC (40) is partially opened to expose the upper surface of the first strip (S1). The first through hole (H1) is used as a vision hole so that the bonding quality of the solder paste (SD) can be checked.

[0071] Among the first strip (S1) to the nth strip (Sn), the strips (S2 to Sn) that are not connected by solder paste (SD) are electrically insulated from the second tab (52) by films (41, 42) of the FFC (40) (see FIG. 9). FIG. 9 illustrates the state in which the second strip (S2) to the twelfth strip (S12) and the second tab (52) are insulated by films (41, 42).

[0072] The first stopper (T1) enables accurate seating and contact of the second tab (52) with respect to the first strip (S1) of the FFC (40). Thus, the first stopper (T1) and the first strip (S1) prevent the fuse assembly (50) from shifting to the FFC (40) and improve the connection strength between the fuse assembly (50) and the FFC (40). Thus, the first stopper (T1) and the first strip (S1) allow connection to a low-cost single FFC without connecting to a high-cost double FFC. Here, "single" means that the tab is connected in one circuit to one strip of the FFC, and "double" means that the tab is connected in two circuits to one strip of the FFC.

[0073] FIG. 10 is a cross-sectional view taken along the line IX-IX of FIG. 6, showing a state in which a second stopper is attached to a second strip and the portion connected to the second stopper is connected with solder paste. Referring to FIG. 10, the second tab (52) is surface-mounted with solder paste (SD) between the second stopper (T2) and the second strip (S2) that is exposed corresponding to the portion connected thereto.

[0074] To this end, the upper film (41) of the films (41, 42) of the FFC (40) is partially opened to expose the upper surface of the second strip (S2). The second through hole (H2) is used as a vision hole, allowing the quality of the soldering to be checked. The first strip (S1), the third strip (S3) to the twelfth strip (S12) and the second tab (52) are shown in a state insulated by the films (41, 42).

[0075] The second stopper (T2) enables accurate seating and contact of the second tab (52) with respect to the second strip (S2) of the FFC (40). Thus, the second stopper (T2) and the second strip (S2) prevent the fuse assembly (50) from shifting to the FFC (40) and improve the connection strength between the fuse assembly (50) and the FFC (40). Thus, the second stopper (T2) and the second strip (S2) allow connection to a low-cost single FFC without connecting to a high-cost double FFC.

[0076] FIG. 11 is a cross-sectional view taken along the line IX-IX of FIG. 6, showing a state in which a 12th stopper is attached to a 12th strip and the portion connected to the 12th stopper is connected with solder paste. Referring to FIG. 11, the 2nd tab (52) is surface-mounted with solder paste (SD) between the 12th stopper (T12) and the 12th strip (S12) that is exposed corresponding to the portion connected thereto.

[0077] To this end, the upper film (41) of the films (41, 42) of the FFC (40) is partially opened to expose the upper surface of the 12th strip (S12). The 12th through hole (H12) is used as a vision hole, allowing the quality of the soldering to be checked. The first strip (S1) to the 11th strip (S11) and the second tab (52) are shown in a state insulated by the films (41, 42).

[0078] The 12th stopper (T12) enables accurate seating and contact of the 2nd tab (52) with respect to the 12th strip (S12) of the FFC (40). Thus, the 12th stopper (T12) and the 12th strip (S12) prevent misalignment of the fuse assembly (50) with respect to the FFC (40) and improve the connection strength between the fuse assembly (50) and the FFC (40). Thus, the 12th stopper (T12) and the 12th strip (S12) enable connection to a low-cost single FFC without connecting to a high-cost double FFC.

[0079] Referring again to FIG. 5, the fuse assembly (50) may further include a plate (55). The plate (55) mechanically connects both sides of the second direction (y-axis direction) of the FPC (53) to the first tab (51) and the second tab (52).

[0080] The first tap (51) and the second tap (52) are spaced apart from each other and each has a tap through hole (511, 521). The second connecting part, the FPC (53), has corresponding through holes (531, 532) corresponding to the tap through holes (511, 521). Since the tap through hole (511) of the first tap (51) is formed as two and the tap through hole (521) of the second tap (52) is formed as two, the corresponding through holes (531, 532) of the FPC (53) are formed as four.

[0081] For example, the plate (55) may be formed from a plastic injection molded product. The plate (55) is provided with a coupling projection (551, 552) corresponding to the corresponding through hole (531, 532) and the tap through hole (511, 521), and after being coupled to the corresponding through hole (531, 532) and the tap through hole (511, 521), it is fixed by a hot stacking method.

[0082] The plate (55) acts as a reinforcing member that mechanically reinforces the electrical connection between the first tab (51) and the second tab (52) by the FPC (53). That is, the plate (55) protects the FPC (53) and the fuse (54), which are the mechanically weakest parts of the fuse assembly (50). Thus, the plate (55) prevents the fuse (54) from being broken by mechanical tension, even though it may be broken by overcurrent.

[0083] The fuse (54) of the FPC (53) is provided with a first terminal (541) and a second terminal (542) at both ends. When the coupling protrusions (551, 552) are coupled to the corresponding through holes (531, 532) and the tap through holes (511, 521), the first terminal (541) and the second terminal (542) are electrically connected to the first tap (51) and the second tap (52).

[0084] Referring again to FIG. 6, the fuse (54) has a width (W1) formed by repeating the sequence of the first direction (x-axis direction) and the second direction (y-axis direction) in which the strip of FFC (50) is extended, the second direction (y-axis direction), the first direction (x-axis direction) of positive (+), the second direction (y-axis direction), and the first direction (x-axis direction) of negative (-).

[0085] The fuse (54) is formed with a first terminal (541) and a second terminal (542) provided at both ends, and is formed as a rectangle with a width (W2) wider than the width (W1), and is connected to the first tap (51) and the second tap (52). The narrow width (W1) sets the operating overcurrent value at which the fuse (54) blows. The first and second terminals (541, 542) with a wide width (W2) secure the electrical connection of the first and second taps (51, 52).

[0086] By using a fuse assembly (50) equipped with such a fuse (54) and a flexible flat cable (FFC), a busbar (30) and a battery management system (BMS) are connected, thereby enabling a cell contact system for detecting the charge status of battery cells (10) to be implemented at a low cost.

[0087] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention.

[0088] - Explanation of the symbols -

[0089] 10: Battery cell 20: Bottom film

[0090] 21: Busbar support 22, 62: Vent

[0091] 30: Busbar 40: FFC (flexible flat cable)

[0092] 41, 42: Film 50: Fuse assembly

[0093] 51, 52: 1st and 2nd tabs 53: FPC (flexible printed circuit)

[0094] 54: Fuse 55: Plate

[0095] 60: Top film 61: Busbar cover

[0096] 211: Opening 511, 521: Tap through hole

[0097] 531, 532: Corresponding through holes 541, 542: First and second terminals

[0098] 551, 552: Connecting protrusions H1~Hn: 1st~nth through holes

[0099] L: Length S1~Sn: 1st~nth strip

[0100] S1~S12: 1st~12th strips SD1, SD2: Solder paste

[0101] W: Width W1, W2: Width

Claims

A busbar that electrically connects multiple battery cells; A first connecting part disposed adjacent to the above busbar; and A fuse assembly having both sides of the fuse connected respectively to the busbar side and the first connection part side to send a signal detected by the busbar to the first connection part, and a stopper engaged on one side of the strip of the first connection part. A secondary battery pack including In paragraph 1, The above first connecting part is formed of an FFC (flexible flat cable), and The above fuse assembly A first tap and a second tap spaced apart from each other and respectively connected to the busbar and the FFC, and A second connecting part that electrically connects the first tap and the second tap via the fuse. A secondary battery pack including In paragraph 2, The above FFC is A secondary battery pack comprising a first strip to an n-th strip that extends in a first direction and has a gap in a second direction intersecting the first direction, and forms a circuit that transmits a detected signal. In paragraph 3, The above second tab is The width formed in the first direction above, A length formed in the above second direction corresponding to the FFC, and A secondary battery pack having an area set with the above width and above length. In paragraph 4, The above stopper is Integrated with the above second tab, A secondary battery pack comprising a first stopper to a nth stopper that supports one of the first strip to the nth strip, corresponding to one side of each of the first strip to the nth strip. In paragraph 5, One of the first to nth strips is exposed, and The exposed strip is A secondary battery pack electrically connected by solder paste to a portion connected to one of the first to nth stoppers corresponding to the second tab. In paragraph 6, Each of the above first to nth stoppers is, The second tab is cut and bent to form a through hole in the second tab, and Spacing along the elongation direction of the corresponding strip, A secondary battery pack corresponding to multiple points of the strip exposed in response. In Paragraph 7, The above second tab is A secondary battery pack surface-mounted with solder paste between the strips exposed in correspondence with the above. In paragraph 6, The strips among the first to nth strips that are not connected by solder paste are A secondary battery pack electrically insulated from the second tab by the film of the above FFC. In paragraph 2, The above second connection part is formed of an FPC (flexible printed circuit), and The above fuse assembly A secondary battery pack further comprising a plate that mechanically connects both sides of the above FPC to the first tab and the second tab. In Paragraph 10, The above first tab and the above second tab are They are spaced apart from each other and each is equipped with a tap through hole, The above FPC is A secondary battery pack having a corresponding through hole corresponding to the above-mentioned tab through hole. In Paragraph 11, The above plate is A secondary battery pack formed from plastic injection molding. In Paragraph 12, The above plate is A secondary battery pack having a coupling projection corresponding to the corresponding through hole and the tab through hole, which is coupled to the corresponding through hole and the tab through hole and then fixed by a hot stacking method. In Paragraph 13, The above fuse is equipped with a first terminal and a second terminal at both ends, and When the above coupling projection is coupled to the corresponding through hole and the tab through hole, A secondary battery pack in which the first terminal and the second terminal are electrically connected to the first tab and the second tab. In paragraph 2, The above second connection part is formed of an FPC (flexible printed circuit), and The first tab above is connected to the busbar, and The above second tap is connected to the above FFC, and The first tab and the second tab are connected to the FPC, and The above fuse assembly A secondary battery pack further comprising a reinforcing member that mechanically reinforces the electrical connection between the first tab and the second tab by the above FPC. In paragraph 2, The above fuse is With respect to the first direction in which the FFC strip extends and the second direction intersecting the first direction, A secondary battery pack having a width formed by repeating the order of the above second direction, the positive first direction, the above second direction, and the negative first direction. In Paragraph 16, The above fuse is The first terminal and the second terminal provided at both ends are formed as a rectangle having a width wider than the width, A secondary battery pack connected to the first tab and the second tab above. In paragraph 2, The above second tab is formed as a nickel tab, in a secondary battery pack. In paragraph 1, A bottom film covering the plurality of battery cells, and A secondary battery pack further comprising the above busbar, the above first connecting part, and a top film disposed on the above fuse assembly and attached to the bottom film by hot pressing. In Paragraph 19, The above top film is A secondary battery pack having an opening corresponding to the opening of the bottom film.

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