CCS assembly and battery pack with same

Abstract

The utility model 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] This application relates to the field of new energy technology, and in particular to a CCS module and a battery pack having the same. Background Technology

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

[0003] CCS components come in various configurations, with flexible printed circuits (FPCs) and ordinary wire harnesses being the most common, and flexible flat cables (FFCs) being less common.

[0004] In related technologies, in CCS modules with an FFC structure, all flat conductors within the FFC use the same width to better achieve standardized production. However, when the FFC in this CCS module is used to provide balancing current to the individual cells of the battery pack for energy equalization, the flat conductors carrying the balancing current need to have a large overcurrent capacity. Therefore, each conductor in the FFC is widened. This approach not only increases the material cost of the FFC but also increases the insulation risk between adjacent conductors. Summary of the Invention

[0005] The purpose of this application is to solve at least one of the above-mentioned technical problems by providing a CCS component and a battery pack having therein.

[0006] Firstly, a CCS component is proposed, including:

[0007] Signal acquisition terminals are used to acquire voltage and temperature signals of individual battery cells in the battery pack;

[0008] A flexible flat cable includes a first flat conductor and a second flat conductor spaced apart from each other in the width direction of the flexible flat cable, wherein the first flat conductor is connected to the signal acquisition terminal for extracting the voltage signal and supplying equalizing current to the battery cell via the signal acquisition terminal, and the second flat conductor is connected to the signal acquisition terminal for extracting the temperature signal.

[0009] The width of the second flat conductor is smaller than the width of the first flat conductor.

[0010] In some possible implementations, the signal acquisition terminal includes a first pad for connecting to the 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 the two ends of the thermistor to output the temperature signal.

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

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

[0013] In some possible implementations, the signal acquisition terminal is configured with a plurality of first flat conductors, second flat conductors and third flat conductors defining conductor groups, and the flexible flat cable includes a plurality of the conductor groups, the plurality of conductor groups being arranged in the width direction and respectively connected to the plurality of signal acquisition terminals.

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

[0015] A slit is provided on the insulating film between adjacent conductor groups, extending along the length direction of the flexible flat cable. Based on the slit, the conductor group is bent perpendicular to the length direction to the corresponding signal acquisition terminal.

[0016] In some possible implementations, it also includes:

[0017] The second signal acquisition terminal is used to acquire the voltage signal of the second battery cell in the battery pack, and includes a fourth pad for connecting to the electrode of the second battery cell to output the voltage signal of the second battery cell.

[0018] The flexible flat cable also includes:

[0019] The fourth flat conductor, spaced apart from the first flat conductor, the second flat conductor, and the third flat conductor in the width direction, and soldered to the fourth pad, is used to lead out the voltage signal of the second battery cell and supply equalization current to the second battery cell via the second signal acquisition terminal.

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

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

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

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

[0025] In some possible implementations, the flexible flat cable has a lead-out end that is remote from the signal acquisition terminal and the second signal acquisition terminal;

[0026] At the lead-out end, in the length direction, the tips of the second flat conductor and the third flat conductor are positioned further inward than the tips of the first flat conductor and the fourth flat conductor.

[0027] Secondly, a battery pack is proposed, comprising:

[0028] A battery stack composed of multiple individual battery cells;

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

[0030] According to the CCS assembly provided in this application, by setting the width of the first portion of the flat conductors in the flexible flat cable to be smaller than the width of the second portion of the flat conductors, the width of the first portion of the flat conductors can be reduced as much as possible while ensuring the overcurrent capacity of the second portion of the flat conductors. This helps to save material costs for the flexible flat cable and also helps to reduce the overall width of the flexible flat cable, thus reducing its footprint on the side of the stack. Furthermore, given a fixed overall width of the flexible flat cable, this design can increase the electrical isolation distance between adjacent flat conductors, reducing insulation risks. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0032] Figure 1 This is a top view schematic diagram of a portion of the battery pack provided in an embodiment of this application. For the reader's convenience in understanding this technology, [the diagram is shown here]. Figure 1 In the image, dashed lines are used to indicate the obscured edges of the relevant battery cells and plastic supports.

[0033] Figure 2 yes Figure 1 An enlarged schematic diagram of a portion thereof, in Figure 2 In the middle, the aforementioned dotted lines have been removed.

[0034] Figure 3 yes Figure 1 A top-view diagram of the CCS component.

[0035] Explanation of reference numerals in the attached figures:

[0036] DL - Length direction, DW - Width direction;

[0037] 1000-battery pack;

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

[0039] 1A, 1B, 1C, 1D, 1E, 1F, 1G - individual 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-pads, 36-thermistor;

[0043] 4A, 4B, 4C, 4D - Conductor busbars;

[0044] 5- Flexible flat cable;

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

[0046] 51 - Insulating film;

[0047] 5OT - Lead-out terminal. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0049] In the description of this application, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects, and, for example, the term "first element" itself does not imply the existence of a "second element," nor does the term "second element" itself imply the existence of a "first element." Furthermore, words such as "a" or "one" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates not less than two.

[0050] In the description of this application, the terms "comprising" or "having" indicate the presence of the said features, numbers, operations, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, and / or combinations thereof.

[0051] In the description of this application, references to "one embodiment" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

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

[0053] Figure 1 The double-dotted line in the figure represents a cutoff line, which cuts off another part of the battery pack 1000 and omits the depiction of that other part.

[0054] Please combine Figure 2 and Figure 3 ,in Figure 2 It shows Figure 1 Part of CCS Component 100 Figure 3 It shows Figure 2 Part of the CCS assembly 100. The CCS assembly 100 includes a plastic support 2, multiple conductive bars 4A, 4B, 4C, 4D, multiple 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, signal acquisition terminals 3A, 3B, 3C, 3D and flexible flat cable 5 together, so that the CCS component 100 can be stored, transported and sold as a whole before being installed into the battery pack 1000, reducing the workload of the battery pack manufacturer.

[0056] The plastic bracket 2 has a plurality of holes spaced apart along its length. Conductive bars 4A, 4B, 4C, and 4D cover these holes separately, and are fixed to the plastic bracket 2 by screws (not shown). Because the holes are covered and obstructed by the conductive bars 4A, 4B, 4C, and 4D, [the following text is missing: "cannot be seen"] Figure 1 and Figure 2 It is shown in the image. Figure 1In the diagram, the back side (facing the paper) of the rightmost conductive busbar 3D is welded to the positive terminal of the rightmost battery cell 1G, thus functioning as the overall positive conductive busbar of the battery pack 1000. The back sides of each of the remaining conductive buses 3A, 3B, and 3C are welded to the positive and negative terminals of two adjacent battery cells (e.g., the positive terminal of battery cell 1A and the negative terminal of battery cell 1B), respectively, to electrically connect adjacent battery cells in series. It can be seen that the aforementioned holes provide connection channels between conductive buses 4A, 4B, 4C, and 4D and the electrode terminals of battery cells 1A, 1B, 1C, 1D, 1E, 1F, and 1G, allowing the back sides of conductive buses 4A, 4B, 4C, and 4D to contact and weld with the electrode terminals of battery cells 1A, 1B, 1C, 1D, 1E, 1F, and 1G.

[0057] In addition, Figure 1 and Figure 2 The diagram omits other conductive bars located opposite to the multiple conductive bars 4A, 4B, 4C, and 4D shown in the figure. One of these other conductive bars is welded to the negative terminal of the rightmost battery cell 1A, thus functioning as the overall negative conductive bar for the battery pack. The remaining conductive bars are welded to the positive and negative terminals of two adjacent battery cells (e.g., the positive terminal of battery cell 1B and the negative terminal of battery cell 1C), respectively, to electrically connect the adjacent battery cells in series. Because the aforementioned other conductive bars... Figure 1 The conductive busbars 4A, 4B, 4C, and 4D shown have essentially the same structure and function, therefore, their depiction is omitted.

[0058] Multiple signal acquisition terminals 3A, 3B, 3C, and 3D are respectively soldered to the aforementioned multiple conductive bars 4A, 4B, 4C, and 4D, thereby acquiring the signals of the corresponding battery cells 1A, 1C, 1E, and 1G through the corresponding conductive bars 4A, 4B, 4C, and 4D.

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

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

[0061] More specifically, the metal plates 32 of the signal acquisition terminals 3B and 3D are respectively soldered to the conductive bus 4B and 4D, and the conductive bus 4B and 4D are respectively soldered to the electrode posts of the battery cells 1C and 1G. Therefore, the signal acquisition terminals 3B and 3D can acquire the voltage signals of the battery cells 1C and 1G through the conductive bus 4B and 4D, and output the voltage signals of the battery cells 1C and 1G using the pad 37. The metal plates 32 of the signal acquisition terminals 3A and 3C are respectively soldered to the conductive bus 4A and 4C, and the conductive bus 4A and 4C are respectively soldered to the electrode posts of the battery cells 1A and 1E. The thermistor 36 is thermally coupled to the battery cells 1A and 1E through the conductive bus 4A and 4C. The conductive bus 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. Therefore, the signal acquisition terminals 3A and 3C can acquire the voltage signal and temperature signal of the battery cells 1A and 1E through the conductive bus 4A and 4C, respectively, and output the voltage signal of the battery cells 1A and 1E using the pad 33, and output the temperature signal of the battery cells 1A and 1E using the pads 34 and 35.

[0062] The flexible flat cable 5 includes a plurality of flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h arranged spaced apart from each other along the width direction DW of the flexible flat cable 5, and an insulating film 51 covering these flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h. Three adjacent flat conductors 5a, 5b, and 5c correspond to signal acquisition terminal 3A; three adjacent flat conductors 5e, 5f, and 5g correspond to signal acquisition terminal 3C; and flat conductors 5d and 5g correspond to signal acquisition terminals 3B and 3D, respectively.

[0063] For ease of description, the three flat conductors 5a, 5b, and 5c are referred to as one conductor group, and the three flat conductors 5e, 5f, and 5g are referred to as another conductor group. The middle flat conductor in each conductor group, namely flat conductors 5b and 5f, is referred to as the first flat conductor. The other two flat conductors are referred to as the second flat conductor (e.g., flat conductors 5a and 5e) and the third flat conductor (e.g., flat conductors 5c and 5g), respectively. In addition, flat conductors 5d and 5g are referred to as the fourth flat conductor.

[0064] exist Figure 1In this configuration, four signal acquisition terminals 3A, 3B, 3C, and 3D are arranged spaced apart along the length DL of the flexible flat cable 5, while two fourth flat conductors 5d and 5g and two conductor groups are arranged alternately along the width DW of the flexible flat cable 5. This arrangement allows the two fourth flat conductors 5d and 5g and the two conductor groups to be neatly connected to the four signal acquisition terminals 3A, 3B, 3C, and 3D respectively along the flexible flat cable 5.

[0065] Cuts extending along the length direction DL of the flexible flat cable 5 can be provided on the insulating film between the first conductor group and the flat conductor 5d, and on the insulating film between the other conductor group and the flat conductor 5g. Based on these cuts, the two conductor groups are bent perpendicular to the length direction DL and extend to the corresponding signal acquisition terminals 3A and 3C, and the two fourth flat conductors 5d and 5g are bent perpendicular to the length direction DL and extend to the signal acquisition terminals 3B and 3D (second signal acquisition terminals). For the technique of using cuts to bring out the flat conductors in the flexible flat cable, please refer to the patent document with publication number CN113068297A for understanding; it will not be elaborated here.

[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 directions of the flexible flat cable 5 before its flat conductors 5a, 5b, 5c, 5d, 5e, 5f, 5g, and 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, and 1G, the arrangement direction of the multiple signal acquisition terminals 3A, 3B, 3C, and 3D, and the arrangement direction of the multiple conductive bars 4A, 4B, 4C, and 4D.

[0067] For more details, please see Figure 3 and combined Figure 1 and Figure 2In one wire group, flat wires 5a, 5b, and 5c are soldered to pads 34, 33, and 35 of signal acquisition terminal 3A, respectively. In another wire group, flat wires 5e, 5f, and 5g are soldered to pads 34, 33, and 35 of signal acquisition terminal 3C, respectively. Flat wires 5d and 5h are soldered to pads 37 of signal acquisition terminals 3B and 3D, respectively. Therefore, flat wires 5b, 5d, 5f, and 5h are electrically connected to the electrodes of the corresponding battery cells to extract the voltage signals of the corresponding battery cells 1A, 1C, 1E, and 1G. Flat wires 5a and 5c are connected to the two ends of the thermistor 36 in signal acquisition terminal 3A to extract the temperature signal of battery cell 1A. Flat wires 5e and 5g are connected to the two ends of the thermistor 36 in signal acquisition terminal 3C to extract the temperature signal of battery cell 1C. Furthermore, as is known to those skilled in the art, the wires connecting to the electrodes of these battery cells typically serve to supply equalizing current to the battery cells, thereby equalizing the energy of the battery pack. Since the equalizing current is generally several amperes, the flat wires 5b, 5d, 5f, and 5h are required to have sufficient overcurrent capacity. This requirement 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 acquire the terminal voltage of the thermistor 36 do not need to have overcurrent capacity; therefore, the width of the flat wires 5a, 5c, 5e, and 5g can be set to an appropriately small width.

[0068] Therefore, in this embodiment, the widths of the flat conductors 5a, 5c, 5e, and 5g are set to be smaller than the widths of the flat conductors 5b, 5d, 5f, and 5h. This design ensures the overcurrent capacity of the flat conductors 5b, 5d, 5f, and 5h while minimizing the width of the flat conductors 5a, 5c, 5e, and 5g. This helps save on the material cost of the flexible flat cable 5 and reduces the overall width of the flexible flat cable 5, thus decreasing its footprint on the side of the stack 200. Furthermore, given a fixed overall width of the flexible flat cable 5, this design increases the electrical isolation distance between adjacent flat conductors, reducing insulation risks.

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

[0070] The flexible flat cable 5 has a lead-out terminal 5OT located away from the signal acquisition terminals 3A, 3B, 3C, and 3D. At this lead-out terminal 5OT, the tips of the flat conductors 5a, 5c, 5e, and 5g are positioned further inward than the tips of the flat conductors 5b, 5d, 5f, and 5h. This design helps to increase the electrical isolation of the flat conductors 5b, 5d, 5f, and 5h at their tips, ensuring a sufficiently high insulation withstand voltage over a limited distance.

Claims

1. A CCS assembly (100) characterized by, Comprising: signal acquisition terminals (3A, 3C) for acquiring voltage signals and temperature signals of battery cells (1A, 1E) in a battery pack (1000); a flexible flat cable (5) including first flat wires (5b, 5f) and second flat wires (5a, 5e) spaced apart from each other in a width direction (DW) of the flexible flat cable (5), wherein the first flat wires (5b, 5f) are connected to the signal acquisition terminals (3A, 3C) for leading out the voltage signals and supplying equalization currents to the battery cells (1A, 1E) via the signal acquisition terminals (3A, 3C), and the second flat wires (5a, 5e) are connected to the signal acquisition terminals (3A, 3C) for leading out the temperature signals; wherein a width of the second flat wires (5a, 5e) is smaller than a width of the first flat wires (5b, 5f).

2. The CCS assembly of claim 1, wherein, The signal acquisition terminals (3A, 3C) include first pads (33) for connecting to electrodes of the battery cells (1A, 1E) to output the voltage signals, thermistors (36) thermally coupled to the battery cells (1A, 1E) to detect the temperature signals, and second pads (34) and third pads (35) respectively connected to two ends of the thermistors (36) to output the temperature signals; The flexible flat cable (5) further includes third flat wires (5c, 5g) spaced apart from the first flat wires (5b, 5f) and the second flat wires (5a, 5e) in the width direction (DW) of the flexible flat cable (5), wherein the first flat wires (5b, 5f) are soldered to the first pads (33), the second flat wires (5a, 5e) are soldered to the second pads (34), the third flat wires (5c, 5g) are soldered to the third pads (35), and a width of the third flat wires (5c, 5g) is smaller than the width of the first flat wires (5b, 5f).

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

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

5. The CCS assembly (100) of claim 4, wherein, The plurality of the signal acquisition terminals (3A, 3C) are arranged spaced apart in a length direction (DL) of the flexible flat cable (5); A slit extending in a length direction (DL) of the flexible flat cable (5) is provided on an insulating coating film between adjacent wire groups, and based on the slit, the wire group is bent perpendicularly to the length direction (DL) to the corresponding signal acquisition terminal (3A, 3C).

6. The CCS assembly (100) of claim 5, wherein, Further comprising: 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 including 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) arranged apart 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 welded to the fourth pad (37) for leading out the voltage signal of the second battery cell (1C, 1G) and supplying an equalization current to the second battery cell (1C, 1G) via the second signal acquisition terminal (3B, 3D); wherein the width of the second flat wire (5a, 5e) and the third flat wire (5c, 5g) is smaller than the width of the fourth flat wire (5d, 5h).

7. The CCS assembly (100) of claim 6, wherein, The second signal acquisition terminal (3B, 3D) and the fourth flat wire (5d, 5h) are respectively configured with a plurality of, and a plurality of the signal acquisition terminals (3A, 3C) and a plurality of the second signal acquisition terminals (3B, 3D) are arranged alternately in the length direction (DL), and a plurality of the fourth flat wires (5d, 5h) and a plurality of the wire groups are arranged alternately in the width direction (DW). A slit extending in a length direction (DL) of the flexible flat cable (5) is provided on an insulating coating film between the fourth flat wire (5d, 5h) and the wire group adjacent to the fourth flat wire (5d, 5h), and based on the slit, the wire group is bent perpendicularly to the length direction (DL) to extend to the signal acquisition terminal (3A, 3C), and the fourth flat wire (5d, 5h) is bent perpendicularly to the length direction (DL) to extend to the second signal acquisition terminal (3B, 3D).

8. The CCS assembly (100) of claim 7, wherein, For each of the wire groups, 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, the width of the first flat wire (5b, 5f) is the same as the width of the fourth flat wire (5d, 5h), and the width of the second flat wire (5a, 5e) is the same as the width of the third flat wire (5c, 5g).

9. The CCS assembly (100) of claim 8, wherein, The flexible flat cable (5) has a lead-out end (5OT) distal from the signal collection terminal (3A, 3C) and the second signal collection terminal (3B, 3D); At the lead-out end (5OT), in the length direction (DL), the tips of the second flat conductors (5a, 5e) and the tips of the third flat conductors (5c, 5g) are arranged at a position more inward than the tips of the first flat conductors (5b, 5f) and the tips of the fourth flat conductors (5d, 5h).

10. A battery pack (1000) characterized by, Comprising: a battery stack (200) stacked by 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, is arranged at one side of the battery stack (200).

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