CCS assembly and battery pack with same

Abstract

The invention relates to the technical field of new energy, in particular to a CCS assembly and a battery pack with the same. The CCS assembly comprises a signal acquisition terminal used for acquiring voltage signals and temperature signals of single batteries in a battery pack; and a flexible flat cable including a first flat wire and a second flat wire spaced apart from each other in a width direction of the flexible flat cable, in which the first flat wire is connected to the signal acquisition terminal for leading out the voltage signal and supplying an equalizing current to the battery cells via the signal acquisition terminal, and the second flat wire is connected to the signal acquisition terminal for supplying an equalizing current to the battery cells via the signal acquisition terminal. The second flat wire is connected to the signal acquisition terminal and is used for leading out the temperature signal; wherein the width of the second flat wire is smaller than that of the first flat wire.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a CCS component and a battery pack having the same. Background Art

[0002] In the new energy battery industry, more and more manufacturers use integrated busbars (Cells Contact System, CCS) to collect signals from battery packs, such as collecting the voltage and / or temperature of each battery cell in the battery pack.

[0003] CCS components have a variety of configurations, among which flexible printed circuits (FPC) and ordinary wiring harnesses are the mainstream, and a small number are flexible flat cables (FFC) structures.

[0004] In the related art, in the CCS assembly of the FFC structure, in order to better achieve standardized production, all flat wires in the FFC adopt the same width size. However, when the FFC in the CCS assembly is used to provide balancing current for the battery cells of the battery pack to balance the energy of the battery pack, those flat wires that transmit the balancing current need to have a large overcurrent capacity, so each wire of the FFC will be widened. This practice not only increases the material cost of the FFC, but also increases the insulation risk between adjacent wires. Summary of the invention

[0005] The purpose of the present application is to solve at least one of the above-mentioned technical problems and to provide a CCS component and a battery pack having the same.

[0006] In the first aspect, a CCS component is proposed, comprising:

[0007] Signal acquisition terminal, used to collect voltage signals and temperature signals of battery cells in the battery pack;

[0008] A flexible flat cable, comprising a first flat wire and a second flat wire separated from each other in a width direction of the flexible flat cable, wherein the first flat wire is connected to the signal acquisition terminal for leading out the voltage signal and supplying a balancing current to the battery cell via the signal acquisition terminal, and the second flat wire is connected to the signal acquisition terminal for leading out the temperature signal;

[0009] Wherein, the width of the second flat conductive line is smaller than the width of the first flat conductive line.

[0010] In some possible implementations, the signal acquisition terminal includes a first pad connected to an electrode of the battery cell to output the voltage signal, a thermistor thermally coupled to the battery cell to detect the temperature signal, and a second pad and a third pad respectively connected to both ends of the thermistor to output the temperature signal;

[0011] The flexible flat cable also includes a third flat wire separated from the first flat wire and the second flat wire in the width direction of the flexible flat cable, wherein the first flat wire is welded to the first soldering pad, the second flat wire is welded to the second soldering pad, the third flat wire is welded to the third soldering pad, and the width of the third flat wire (5c, 5g) is smaller than the width of the first flat wire.

[0012] In some possible implementations, the first flat wire, the second flat wire, and the third flat wire are three adjacent flat wires in the flexible flat cable.

[0013] In some possible embodiments, the signal acquisition terminal is configured in plurality, the first flat wire, the second flat wire and the third flat wire define a wire group, the flexible flat cable includes a plurality of the wire groups, the plurality of wire groups are arranged in the width direction and are respectively connected to the plurality of signal acquisition terminals.

[0014] In some possible implementations, the plurality of signal acquisition terminals are spaced apart and arranged in the length direction of the flexible flat cable;

[0015] A slit extending along the length direction of the flexible flat cable is provided on the insulating coating between adjacent wire groups, and based on the slit, the wire group is bent perpendicularly to the length direction to the corresponding signal acquisition terminal.

[0016] In some possible implementations, the following further includes:

[0017] a second signal acquisition terminal, used to acquire a voltage signal of a second battery cell in the battery pack, and comprising a fourth pad used to be connected to an electrode of the second battery cell to output the voltage signal of the second battery cell;

[0018] The flexible flat cable further comprises:

[0019] a fourth flat wire, arranged in the width direction apart from the first flat wire, the second flat wire and the third flat wire, and welded to the fourth pad, for leading out the voltage signal of the second battery cell and supplying a balancing current to the second battery cell via the second signal acquisition terminal;

[0020] The widths of the second flat wire and the third flat wire are smaller than the width of the fourth flat wire.

[0021] In some possible implementations, the second signal acquisition terminal and the fourth flat wire are respectively configured in plurality, and the plurality of the signal acquisition terminals and the plurality of the second signal acquisition terminals are alternately arranged in the length direction, and the plurality of the fourth flat wires and the plurality of the wire groups are alternately arranged in the width direction;

[0022] A slit extending along the length direction of the flexible flat cable is provided on the insulating coating between the fourth flat wire and the wire group adjacent to the fourth flat wire. Based on the slit, the wire group is bent perpendicularly to the length direction and extends to the signal acquisition terminal, and the fourth flat wire is bent perpendicularly to the length direction and extends to the second signal acquisition terminal.

[0023] In some possible implementations, for each of the wire groups, in the width direction, the first flat wire is arranged between the second flat wire and the third flat wire;

[0024] In all of the fourth flat wires and all of the wire groups, the width of the first flat wire is the same as that of the fourth flat wire, and the width of the second flat wire is the same as that of the third flat wire.

[0025] In some possible implementations, the flexible flat cable has a lead-out terminal away from the signal collection terminal and the second signal collection terminal;

[0026] At the lead end, the tips of the second flat wire and the third flat wire are arranged on the inner side than the tips of the first flat wire and the fourth flat wire in the longitudinal direction.

[0027] In a second aspect, a battery pack is provided, comprising:

[0028] A battery stack formed by stacking a plurality of battery cells;

[0029] The CCS assembly as described in the first aspect is arranged on one side of the battery stack.

[0030] According to the CCS assembly provided by the present application, by setting the width of the first part of the flat wire in the flexible flat cable to be smaller than the width of the second part of the flat wire, the width of the first part of the flat wire can be reduced as much as possible while ensuring the overcurrent capacity of the second part of the flat wire, thereby helping to save the material cost of the flexible flat cable, and helping to reduce the width of the flexible flat cable as a whole, and reducing its occupied area on the side of the stack. In addition, when the width of the flexible flat cable as a whole is constant, such a design can increase the electrical isolation distance between adjacent flat wires and reduce insulation risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0032] Figure 1 This is a schematic top view of a portion of a battery pack provided in an embodiment of the present application. To facilitate readers to understand the present technology, Figure 1 In the figure, dotted lines are used to illustrate the edge contours of the relevant battery cells and plastic brackets that are not visible due to being blocked.

[0033] Figure 2 yes Figure 1 An enlarged schematic diagram of a portion of Figure 2 The aforementioned dotted lines are removed.

[0034] Figure 3 yes Figure 1 Schematic diagram of the top view of the CCS components.

[0035] Description of reference numerals:

[0036] DL-length direction, DW-width direction;

[0037] 1000-battery pack;

[0038] 100-CCS module, 200-battery stack;

[0039] 1A, 1B, 1C, 1D, 1E, 1F, 1G - battery cells;

[0040] 2-Plastic bracket;

[0041] 3A, 3B, 3C, 3D-signal acquisition terminals;

[0042] 31-PCB board, 32-metal sheet, 33, 34, 35, 37-soldering pads, 36-thermistor;

[0043] 4A, 4B, 4C, 4D-conductive bars;

[0044] 5-Flexible flat cable;

[0045] 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h - flat wire;

[0046] 51-insulation coating;

[0047] 5OT-lead-out terminal. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0049] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects, and, for example, the term "first element" itself does not mean the existence of the "second element", and the term "second element" itself does not mean the existence of the "first element". In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one, and "multiple" means not less than two.

[0050] In the description of the present application, the terms “including”, “having” indicate the existence of the described features, numbers, operations, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, numbers, operations, elements and / or their combinations.

[0051] In the description of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the present specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0052] Figure 1A schematic diagram of a portion of a battery pack 1000 provided in an embodiment of the present application in a top view direction, the battery pack 1000 includes a plurality of battery cells 1A, 1B, 1C, 1D, 1E, 1F, 1G and a CCS assembly 100. The plurality of battery cells 1A, 1B, 1C, 1D, 1E, 1F, 1G are stacked and arranged in a straight line direction DL to form a battery stack 200, and the CCS assembly 100 covers one side of the battery stack 200 and is engaged therewith, and is used to collect relevant signals of the battery cells 1A, 1C, 1E, 1G, and transmit the collected signals to a battery management system BMS (not shown).

[0053] Figure 1 The two-dot chain line in denoted by FIG. 1 represents a cutoff line, which cuts off another part of the battery pack 1000 and omits the depiction of the other part.

[0054] Please combine again Figure 2 and Figure 3 ,in Figure 2 Shows Figure 1 A portion of the CCS assembly 100, Figure 3 Shows Figure 2 The CCS assembly 100 includes a plastic bracket 2, a plurality of conductive bars 4A, 4B, 4C, 4D, a plurality of signal acquisition terminals 3A, 3B, 3C, 3D and a flexible flat cable 5.

[0055] The plastic bracket 2 is formed into a roughly rectangular plate-like configuration, which is used to integrate the conductive bars 4A, 4B, 4C, 4D, the signal acquisition terminals 3A, 3B, 3C, 3D and the flexible flat cable 5, so that the CCS component 100 can be stored, transported and sold as a complete component before being installed in the battery pack 1000, thereby reducing the workload of the battery pack manufacturer.

[0056] The plastic bracket 2 has a plurality of holes arranged at intervals along its length, and the conductive bars 4A, 4B, 4C, and 4D cover the holes separately from each other, and the conductive bars 4A, 4B, 4C, and 4D are fixed to the plastic bracket 2 via screws (not shown). Figure 1 and Figure 2 In the Figure 1In the figure, the back side (the side facing the paper) of the rightmost conductive bar 3D is welded to the positive pole of the rightmost battery cell 1G, thereby functioning as the total positive conductive bar of the battery pack 1000, and the back side of each of the remaining conductive bars 3A, 3B, and 3C is respectively welded to the positive pole and negative pole of two adjacent battery cells (for example, the positive pole of battery cell 1A and the negative pole of battery cell 1B) to electrically connect the adjacent battery cells in series. It can be seen that the aforementioned holes provide connection channels for the conductive bars 4A, 4B, 4C, and 4D and the electrode poles of the battery cells 1A, 1B, 1C, 1D, 1E, 1F, and 1G, so that the back side of the conductive bars 4A, 4B, 4C, and 4D can contact and weld with the electrode poles of the battery cells 1A, 1B, 1C, 1D, 1E, 1F, and 1G.

[0057] In addition, Figure 1 and Figure 2 Some other conductive bars that are opposite to the multiple conductive bars 4A, 4B, 4C, and 4D shown in the figure are omitted. One of the other conductive bars is welded to the negative pole of the rightmost battery cell 1A, thereby functioning as the total negative conductive bar of the battery pack. The remaining conductive bars of the other conductive bars are respectively welded to the positive pole and negative pole of two adjacent battery cells (for example, the positive pole of battery cell 1B and the negative pole of battery cell 1C) to electrically connect the adjacent battery cells in series. Figure 1 The conductive bars 4A, 4B, 4C, and 4D shown in FIG. 4 have substantially the same structure and function, and therefore, their description is omitted.

[0058] The plurality of signal acquisition terminals 3A, 3B, 3C, 3D are respectively welded to the aforementioned plurality of conductive bars 4A, 4B, 4C, 4D, so as to respectively acquire the signals of the corresponding battery cells 1A, 1C, 1E, 1G via the corresponding conductive bars 4A, 4B, 4C, 4D.

[0059] Specifically, the signal acquisition terminals 3A and 3C each include a PCB board 41 and a metal sheet 32 ​​connected to the PCB board 31, and the metal sheet 32 ​​may be, for example, a nickel sheet. For the signal acquisition terminals 3B and 3D, a thermistor 36 and three pads 33, 34, and 35 are provided on the PCB board thereof, wherein the pad 33 is connected to the metal sheet 32, and the pads 34 and 35 are respectively connected to the two ends of the thermistor 36. For the signal acquisition terminals 3A, 3C, 3E, 3G, and 3I, no thermistor is provided on the PCB board 31 thereof, but a pad 37 connected to the metal sheet 32 ​​is provided.

[0060] The resistance of the thermistor 36 will change according to the change of its temperature. The pad 34, the thermistor 36 and the pad 35 form a series path. Therefore, by measuring the voltage across the thermistor 36, that is, the voltage drop between the pad 34 and the pad 35, the current resistance of the thermistor 36 can be determined, and then the temperature information of the thermistor 36 and the corresponding battery cell can be determined.

[0061] More specifically, the metal sheets 32 of the signal acquisition terminals 3B and 3D are respectively welded to the conductive bars 4B and 4D, which are in turn welded to the electrode columns of the battery cells 1C and 1G. Therefore, the signal acquisition terminals 3B and 3D can respectively collect the voltage signals of the battery cells 1C and 1G via the conductive bars 4B and 4D, and output the voltage signals of the battery cells 1C and 1G using the welding pads 37. The metal sheets 32 of the signal acquisition terminals 3A and 3C are respectively welded to the conductive bars 4A and 4C, which are in turn welded to the electrode posts of the battery cells 1A and 1E, respectively. The thermistor 36 is thermally coupled with the battery cells 1A and 1E via the conductive bars 4A and 4C. The conductive bars 4A and 4C transfer the heat of the battery cells 1A and 1E to the thermistor 36 of the signal acquisition terminals 3A and 3C, respectively. Therefore, the signal acquisition terminals 3A and 3C can respectively acquire the voltage signals and temperature signals of the battery cells 1A and 1E via the conductive bars 4A and 4C, and output the voltage signals of the battery cells 1A and 1E using the welding pads 33, and output the temperature signals of the battery cells 1A and 1E using the welding pads 34 and 35.

[0062] The flexible flat cable 5 includes a plurality of flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h arranged in a spaced relationship from each other in the width direction DW of the flexible flat cable 5 and an insulating coating 51 covering the flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h. Among them, the three adjacently arranged flat conductors 5a, 5b, 5c correspond to the signal acquisition terminal 3A, the other three adjacently arranged flat conductors 5e, 5f, 5g correspond to the signal acquisition terminal 3C, and the flat conductor 5d and the flat conductor 5g correspond to the signal acquisition terminal 3B and the signal acquisition terminal 3D, respectively.

[0063] For the sake of convenience of description, the three flat wires 5a, 5b, and 5c are called a wire group, the three flat wires 5e, 5f, and 5g are called another wire group, and the middle flat wire in each wire group, i.e., the flat wires 5b and 5f, are called the first flat wire, and the other two flat wires are respectively called the second flat wire (such as, flat wires 5a and 5e) and the third flat wire (such as, flat wires 5c and 5g), and in addition, the flat wires 5d and 5g are called fourth flat wires.

[0064] exist Figure 1In the embodiment, the four signal acquisition terminals 3A, 3B, 3C, and 3D are arranged in a spaced relationship in the length direction DL of the flexible flat cable 5, and the two fourth flat wires 5d and 5g and the two wire groups are arranged alternately in the width direction DW of the flexible flat cable 5. In this way, the two fourth flat wires 5d and 5g and the two wire groups can be neatly connected to the four signal acquisition terminals 3A, 3B, 3C, and 3D in the flexible flat cable 5.

[0065] A slit extending along the length direction DL of the flexible flat cable 5 can be provided on the insulating film between the first wire group and the flat wire 5d and on the insulating film between the other wire group and the flat wire 5g, respectively. Based on the slit, the two wire groups are bent perpendicularly to the length direction DL and extended to the corresponding signal acquisition terminals 3A and 3C, and the two fourth flat wires 5d and 5g are bent perpendicularly to the length direction DL and extended to the signal acquisition terminals 3B and 3D (second signal acquisition terminals). The technology of using slits to lead out the flat wires in the flexible flat cable can be understood by referring to the patent document with publication number CN113068297A (such as Figure 4 or Figure 7 of the document), which will not be described in detail herein.

[0066] It should be understood that the length direction DL and width direction DW of the flexible flat cable 5 mentioned here refer to the direction corresponding to the flexible flat cable 5 before its flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h are bent. When the CCS assembly 100 is assembled to the side of the battery stack 200 to form a battery module 1000, the length direction DL of the flexible flat cable 5 is consistent with the stacking direction of the multiple battery cells 1A, 1B, 1C, 1D, 1E, 1F, 1G, the arrangement direction of the multiple signal acquisition terminals 3A, 3B, 3C, 3D, and the arrangement direction of the multiple conductive bars 4A, 4B, 4C, 4D.

[0067] More specifically, see Figure 3 Combined with Figure 1 and Figure 2, the flat wires 5a, 5b, 5c in one wire group are respectively welded to the pads 34, 33, 35 of the signal acquisition terminal 3A, the flat wires 5e, 5f, 5g in the other wire group are respectively welded to the pads 34, 33, 35 of the signal acquisition terminal 3C, and the flat wires 5d, 5h are respectively welded to the pads 37 of the signal acquisition terminals 3B, 3D. Therefore, the flat wires 5b, 5d, 5f, 5h are electrically connected to the electrodes of the corresponding battery cells, so as to lead out the voltage signals of the corresponding battery cells 1A, 1C, 1E, 1G, the flat wires 5a, 5c are connected to the two ends of the thermistor 36 in the signal acquisition terminal 3A, so as to lead out the temperature signal of the battery cell 1A, and the flat wires 5e, 5g are connected to the two ends of the thermistor 36 in the signal acquisition terminal 3C, so as to lead out the temperature signal of the battery cell 1C. In addition, as known to those skilled in the art, such wires connected to the electrodes of the battery cells usually have to supply balancing current to the battery cells to balance the energy of the battery pack. Since the balancing current is generally as high as several amperes, the flat wires 5b, 5d, 5f, and 5h are required to have sufficient overcurrent capability. Such requirements can be met by using flat wires 5b, 5d, 5f, and 5h with sufficient width. In contrast, the flat wires 5a, 5c, 5e, and 5g used to collect the terminal voltage of the thermistor 36 do not need to have overcurrent capability. Therefore, the width of the flat wires 5a, 5c, 5e, and 5g can be set to be appropriately small.

[0068] In view of this, in the present embodiment, the width of the flat conductors 5a, 5c, 5e, 5g is set to be smaller than the width of the flat conductors 5b, 5d, 5f, 5h. Through such a design, while ensuring the overcurrent capacity of the flat conductors 5b, 5d, 5f, 5h, the width of the flat conductors 5a, 5c, 5e, 5g can be reduced as much as possible, thereby helping to save the material cost of the flexible flat cable 5, and helping to reduce the width of the flexible flat cable 5 as a whole, and reducing its occupied area on the side of the stack 200. In addition, when the width of the flexible flat cable 5 as a whole is constant, through such a design, the electrical isolation distance between adjacent flat conductors can be enlarged to reduce the insulation risk.

[0069] To facilitate standardized and efficient production of the flexible flat cable 5, in this embodiment, the four flat conductors 5a, 5c, 5e, 5g have the same width, and the four flat conductors 5b, 5d, 5f, 5h have the same width.

[0070] The flexible flat cable 5 has an outlet 5OT away from the signal acquisition terminals 3A, 3B, 3C, and 3D, and at the outlet 5OT, the tips of the flat wires 5a, 5c, 5e, and 5g are arranged at a position closer to the inside than the tips of the flat wires 5b, 5d, 5f, and 5h. This design helps to increase the degree of electrical isolation of the flat wires 5b, 5d, 5f, and 5h at the tips, so as to ensure a sufficiently large insulation withstand voltage value within a limited distance.

Claims

1. A CCS assembly (100), characterized in that: include: Signal collection terminals (3A, 3C) for collecting voltage signals and temperature signals of battery cells (1A, 1E) in a battery pack (1000); A flexible flat cable (5), comprising a first flat wire (5b, 5f) and a second flat wire (5a, 5e) separated from each other in a width direction (DW) of the flexible flat cable (5), wherein the first flat wire (5a, 5e) is connected to the signal acquisition terminal (3A, 3C) for leading out the voltage signal and supplying a balancing current to the battery cell (1A, 1E) via the signal acquisition terminal (3A, 3C), and the second flat wire (5a, 5e) is connected to the signal acquisition terminal (3A, 3C) for leading out the temperature signal; The width of the second flat wire (5a, 5e) is smaller than the width of the first flat wire (5b, 5f).

2. The CCS assembly according to claim 1, characterized in that: The signal acquisition terminal (3A, 3C) comprises a first pad (33) for connecting to an electrode of the battery cell (1A, 1E) to output the voltage signal, a thermistor (36) thermally coupled to the battery cell (1A, 1E) to detect the temperature signal, and a second pad (34) and a third pad (35) respectively connected to two ends of the thermistor (36) to output the temperature signal; The flexible flat cable (5) further comprises a third flat wire (5c, 5g) separated from the first flat wire (5b, 5f) and the second flat wire (5a, 5e) in a width direction (DW) of the flexible flat cable (5), wherein the first flat wire (5b, 5f) is welded to the first soldering pad (33), the second flat wire (5a, 5e) is welded to the second soldering pad (34), the third flat wire (5c, 5g) is welded to the third soldering pad (35), and the width of the third flat wire (5c, 5g) is smaller than the width of the first flat wire (5b, 5f).

3. The CCS assembly (100) according to claim 2, characterized in that: The first flat wire (5b, 5f), the second flat wire (5a, 5e) and the third flat wire (5c, 5g) are three adjacent flat wires (5a, 5b, 5c; 5e, 5f, 5g) in the flexible flat cable (5).

4. The CCS assembly (100) according to claim 3, characterized in that: The signal acquisition terminals (3A, 3C) are configured in plurality, the first flat wire (5b, 5f), the second flat wire (5a, 5e) and the third flat wire (5c, 5g) define a wire group (5a, 5b, 5c; 5e, 5f, 5g), the flexible flat cable (5) includes a plurality of the wire groups (5a, 5b, 5c; 5e, 5f, 5g), the plurality of wire groups (5a, 5b, 5c; 5e, 5f, 5g) are arranged in the width direction (DW), and are respectively connected to the plurality of signal acquisition terminals (3A, 3C).

5. The CCS assembly (100) according to claim 4, characterized in that: The plurality of signal collection terminals (3A, 3C) are arranged in a spaced-apart manner in the length direction (DL) of the flexible flat cable (5); A slit extending along the length direction (DL) of the flexible flat cable (5) is provided on the insulating coating between adjacent wire groups (5a, 5b, 5c; 5e, 5f, 5g), and based on the slit, the wire groups (5a, 5b, 5c; 5e, 5f, 5g) are bent perpendicularly to the length direction (DL) to the corresponding signal acquisition terminals (3A, 3C).

6. The CCS assembly (100) according to claim 4 or 5, characterized in that: Also includes: A second signal acquisition terminal (3B, 3D) for acquiring a voltage signal of a second battery cell (1C, 1G) in the battery pack (1000), and comprising a fourth pad (37) for connecting to an electrode of the second battery cell (1C, 1G) to output the voltage signal of the second battery cell (1C, 1G); The flexible flat cable (5) further comprises: a fourth flat wire (5d, 5h), which is arranged separately from the first flat wire (5b, 5f), the second flat wire (5a, 5e) and the third flat wire (5c, 5g) in the width direction (DW) and is welded to the fourth welding pad (37), and is used for leading out the voltage signal of the second battery cell (1C, 1G) and supplying a balancing current to the second battery cell (1C, 1G) via the second signal acquisition terminal (3B, 3D); The widths of the second flat wire (5a, 5e) and the third flat wire (5c, 5g) are smaller than the width of the fourth flat wire (5d, 5h).

7. The CCS assembly (100) according to claim 6, characterized in that: The second signal acquisition terminals (3B, 3D) and the fourth flat wires (5d, 5h) are respectively configured in plurality, and the plurality of signal acquisition terminals (3A, 3C) and the plurality of second signal acquisition terminals (3B, 3D) are alternately arranged in the length direction (DL), and the plurality of fourth flat wires (5d, 5h) and the plurality of wire groups (5a, 5b, 5c; 5e, 5f, 5g) are alternately arranged in the width direction (DW); A slit extending along the length direction (DL) of the flexible flat cable (5) is provided on the insulating coating (51) between the fourth flat wire (5d, 5h) and the wire group (5a, 5b, 5c; 5e, 5f, 5g) adjacent to the fourth flat wire (5d, 5h); based on the slit, the wire group (5a, 5b, 5c; 5e, 5f, 5g) is bent perpendicularly to the length direction (DL) and extends to the signal collection terminal (3A, 3C); the fourth flat wire (5d, 5h) is bent perpendicularly to the length direction (DL) and extends to the second signal collection terminal (3B, 3D).

8. The CCS assembly (100) according to claim 7, characterized in that: For each of the wire groups (5a, 5b, 5c; 5e, 5f, 5g), in the width direction (DW), the first flat wire (5b, 5f) is arranged between the second flat wire (5a, 5e) and the third flat wire (5c, 5g); In all of the fourth flat wires (5d, 5h) and all of the wire groups (5a, 5b, 5c; 5e, 5f, 5g), the width of the first flat wire (5b, 5f) is the same as that of the fourth flat wire (5d, 5h), and the width of the second flat wire (5a, 5e) is the same as that of the third flat wire (5c, 5g).

9. The CCS assembly (100) according to claim 8, characterized in that: The flexible flat cable (5) has a lead-out end (5OT) far away from the signal collection terminal (3A, 3C) and the second signal collection terminal (3B, 3D); At the lead end (5OT), in the length direction (DL), the tips of the second flat wires (5a, 5e) and the third flat wires (5c, 5g) are arranged at a position closer to the inside than the tips of the first flat wires (5b, 5f) and the fourth flat wires (5d, 5h).

10. A battery pack (1000), characterized in that: include: A battery stack (200) formed by stacking a plurality of battery cells (1A, 1B, 1C, 1D, 1E, 1F, 1G); The CCS assembly (100) according to any one of claims 1 to 9, arranged on one side of the battery stack (200).

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