Signal transmission line assembly, CCS assembly and battery module

Abstract

The application relates to the new energy technology field, in particular to a signal transmission line assembly, a CCS assembly and a battery module. The signal transmission line assembly comprises a baseband, a length direction, a width direction and a thickness direction which are perpendicular to each other, a first surface and a second surface which are oppositely arranged in the thickness direction; two cable groups which respectively comprise a plurality of flexible flat cables, each flexible flat cable comprises a first extension section which extends along the length direction and is bonded to the first surface, and a second extension section which extends from the end of the first extension section along the width direction, wherein the first extension sections of the plurality of flexible flat cables are sequentially arranged in a partially laminated manner in the width direction, and the overlapping portions of any two adjacent first extension sections are bonded to each other; and a plurality of through holes which are arranged between the two cable groups in the length direction and are spaced apart from each other.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a signal transmission line assembly, a CCS assembly, and a battery module. 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 modules, such as the voltage and / or temperature of each individual cell in the battery module.

[0003] CCS components come in various configurations, with flexible printed circuit (FPC) and ordinary wire harness being the mainstream, and a small number being flexible flat cable (FFC) structures. Among them, CCS components with FFC structures have many drawbacks that cannot be well resolved, which prevents them from being effectively promoted and used.

[0004] Patent document CN113068297A discloses a CCS assembly with an FFC structure. This assembly obtains multiple relatively independent connecting wires by making multiple cuts and flips on the cable body, thereby ensuring the overall rigidity of the FFC on the CCS assembly. However, the CCS assembly in this document has at least the following drawbacks: 1. When the width of the battery module is fixed, which leads to a limited space between the conductive bars (conductive heads), the width of a single flat cable is limited. Consequently, the number of conductors in the flat cable is limited, resulting in a smaller number of independent connecting wires and a smaller number of conductors in a single connecting wire. Therefore, it may not be suitable for large battery modules with many individual cells, nor for medium or large battery modules that require multiple signal acquisitions (such as acquiring the voltage and temperature of each individual cell).

[0005] 2. This CCS component does not take into account the issue of making way for the explosion-proof valve of a single cell in the battery module.

[0006] 3. The various connecting wires extend outwards from the outside of the flat cable by folding them over, making the connecting wires, especially the folded parts, relatively exposed and more susceptible to damage. Summary of the Invention

[0007] The purpose of this application is to solve at least one of the above-mentioned technical problems by providing a signal transmission line assembly, a CCS assembly, and a battery module.

[0008] In a first aspect, this application provides a signal transmission line assembly, comprising: The baseband includes a length direction, a width direction, and a thickness direction that are perpendicular to each other, and a first surface and a second surface that are disposed opposite to each other in the thickness direction; A plurality of first flexible flat cables, each first flexible flat cable including a first extension segment extending along the length direction and bonded to the first surface, and a second extension segment extending from the end of the first extension segment along the width direction, wherein the first extension segments of the plurality of first flexible flat cables are arranged in a partially stacked manner in the width direction, and the overlapping portions of any two adjacent first extension segments are bonded to each other. A plurality of second flexible flat cables, each second flexible flat cable including a third extension segment extending along the length direction and bonded to the first surface, and a fourth extension segment extending from the end of the third extension segment along the width direction, wherein the third extension segments of the plurality of second flexible flat cables are arranged in a partially stacked manner in the width direction, and the overlapping portions of any two adjacent third extension segments are bonded to each other. Multiple through holes are arranged spaced apart from each other along the length direction between the multiple first flexible flat cables and the multiple second flexible flat cables.

[0009] In some possible implementations, the first extension segment and the second extension segment are formed by folding the first flexible flat cable, and the third extension segment and the fourth extension segment are formed by folding the second flexible flat cable.

[0010] In some possible implementations, the folded portion of the first flexible flat cable includes a first portion formed on the first extension and a second portion formed on the second extension, wherein the first portion and the second portion are stacked. The folded portion of the second flexible flat cable includes a third portion formed on the third extension and a fourth portion formed on the fourth extension, wherein the third portion and the fourth portion are stacked.

[0011] In some possible implementations, the first part is bonded to the second part, and the third part is bonded to the fourth part.

[0012] In some possible implementations, for any two adjacent first extensions corresponding to two first flexible flat cables, the first extension of one first flexible flat cable covers the fold and second extension of the other first flexible flat cable. For any two adjacent third extensions corresponding to two second flexible flat cables, the third extension of one second flexible flat cable covers the fold and fourth extension of the other second flexible flat cable.

[0013] In some possible implementations, for any two adjacent first extension segments corresponding to two first flexible flat cables, the portion of one first flexible flat cable that does not overlap with the other first flexible flat cable is directly bonded to the first surface. For any two adjacent third extension segments corresponding to the two second flexible flat cables, the portion of one second flexible flat cable that does not overlap with the other second flexible flat cable is directly bonded to the first surface.

[0014] In some possible implementations, both the second extension and the fourth extension are adhered to the first surface; For any two adjacent first extension segments corresponding to two first flexible flat cables, the first extension segment of one first flexible flat cable covers the first or second portion of the other first flexible flat cable. For any two adjacent third extensions corresponding to two second flexible flat cables, the third extension of one second flexible flat cable covers the third or fourth portion of the other second flexible flat cable.

[0015] In some possible implementations, the baseband has a first side and a second side disposed opposite to each other in the width direction, the second extension extending to the outside of the first side, and the fourth extension extending to the outside of the second side; On the outer side of the first side, a plurality of second extension segments are arranged spaced apart from each other along the length direction; On the outer side of the second side, a plurality of the fourth extension segments are arranged spaced apart from each other along the length direction.

[0016] Secondly, this application proposes a CCS component, comprising: Support plate; The signal transmission line assembly as described in the first aspect is disposed on the support plate; Multiple first conductive bars are disposed on the support plate and arranged at intervals along the length direction. A plurality of second conductive bars are disposed on the support plate and spaced apart along the length direction, and the plurality of second conductive bars are spaced apart from the plurality of first conductive bars in the width direction; The second surface or the first surface is disposed on the support plate, the first extension and the third extension are located between the plurality of first conductive bars and the plurality of second conductive bars, the second extension is connected to the first conductive bar, and the fourth extension is connected to the second conductive bar.

[0017] Thirdly, this application proposes a battery module, including: Multiple individual cells, each of which has an explosion-proof valve and electrode terminals arranged on a first side of the battery module; The CCS component as described in the second aspect is installed on the first side; The plurality of explosion-proof valves are arranged at intervals along the length direction, and the plurality of through holes are respectively provided at the plurality of explosion-proof valves. The first conductive bar and the second conductive bar are electrically connected to the electrode terminals.

[0018] According to the signal transmission line assembly provided in this application, by bonding multiple flexible flat cables that are sequentially partially stacked on the baseband, a large number of signal lines for transmitting signals can be arranged in a small space, enabling the CCS assembly to collect multiple signals from a larger number of individual cells. Furthermore, the flat structure of the flexible flat cables allows for secure bonding to the surface of the baseband and above adjacent flexible flat cables. The baseband maintains the relative positions of the various flexible flat cables, improving the neatness of the wiring and providing pressure relief and explosion-proof holes. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a perspective view of a battery module provided in an embodiment of this application. For clarity, the second flexible flat cable is omitted from the view.

[0021] Figure 2 yes Figure 1 A top view of the signal transmission component.

[0022] Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the structure at the first flexible flat cable.

[0023] Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the structure at the second flexible flat cable.

[0024] Figure 5 yes Figure 2The diagram shows a partial enlarged view of the structure at the three adjacent first flexible flat cables.

[0025] Figure 6 yes Figure 2 The diagram shows a partial enlarged view of the structure at the two adjacent second flexible flat cables.

[0026] Figure 7 This is a schematic diagram of the cross-section of a flexible flat cable.

[0027] Figure 8 This is a top view of a CCS component provided in another embodiment of this application.

[0028] Figure 9 yes Figure 8 The diagram shows a partial enlarged view of the structure at the two adjacent first flexible flat cables.

[0029] Explanation of reference numerals in the attached figures: F1 - Length direction, F2 - Width direction, F3 - Thickness direction; The overlapping area between S-flexible flat cables; 1000-CCS module, 2000-single cell; 100 - Signal transmission line assembly, 100A - First end, 100B - Second end, 100C - First side, 100D - Second side; 1-First flexible flat cable, 1A-First extension, 1Aa-First section, 1B-Second extension; 2-Second flexible flat cable, 2A-Third extension, 2Aa-Third section, 2B-Fourth extension; 3-Baseband, 3A-First side, 3B-Second side; 4-Through hole; 6-First conductive busbar; 7-Second conductive busbar; 8-First signal lead; 9-Second signal lead; 10-Strap; 11-Hot riveting column; 12 - First welding terminal; 13-Second welding terminal; 14-Support plate; 15-Conductor; 16-film layer. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Figures 1 to 7 A battery module according to an embodiment of this application is shown. The battery module includes a plurality of single cells 2000 and a CCS component 1000.

[0035] The CCS assembly 1000 includes a support plate 14, a signal transmission line assembly 100, a plurality of first conductive bars 6, and a plurality of second conductive bars 7. The signal transmission line assembly 100 includes a baseband 3, which includes a length direction F1, a width direction F2, and a thickness direction that are perpendicular to each other.

[0036] Multiple individual cells 2000 are stacked along the aforementioned length direction F1 and secured by two annular straps 10 surrounding them. Each individual cell 2000 has an explosion-proof valve (obscured in the figure) and two electrode terminals, a positive terminal and a negative terminal, spaced apart in the width direction F2. Furthermore, the explosion-proof valve and electrode terminals of each individual cell 2000 are arranged within the battery module... Figure 1 On the upper side (first side), the electrode terminals of these single cells 2000 are arranged in two rows on the upper side of the battery module, one row of electrode terminals is on Figure 1 The upper left side of the battery module is arranged at intervals F1 along the length direction, and another row of electrode terminals is located at... Figure 1 The upper right side of the battery module is arranged at intervals F1 along the length direction.

[0037] The CCS assembly 1000 is mounted on the upper side of the battery module, thereby being close to the electrode terminals of each individual cell 2000 to facilitate the connection of relevant components (such as conductive bars) on the CCS assembly 1000 to the electrode terminals.

[0038] The support plate 14 is a one-piece structure made of plastic, which can be manufactured using injection molding or vacuum forming processes. The support plate 14 has a relatively flat front (…). Figure 1 The middle side facing the observer) and the back side ( Figure 1 (The side facing away from the observer), where the back side faces the aforementioned single cell 2000, and the back side faces away from the single cell 2000.

[0039] Multiple first conductive bars 6 are fixedly disposed on the front side of the support plate 14 and arranged in a row at intervals along the length direction F1. These first conductive bars 6 cover one of the aforementioned two rows of electrode terminals and are electrically connected to that row of electrode terminals by welding. Multiple second conductive bars 7 are also fixedly disposed on the front side of the support plate 14 and arranged in a row at intervals along the length direction F1. These second conductive bars 7 cover the other row of the aforementioned two rows of electrode terminals and are electrically connected to that row of electrode terminals by welding. In detail, the support plate 14 has welding holes extending from its front side to its back side at the positions of each first conductive bar 6 and second conductive bar 7. A portion of the first conductive bar 6 and the second conductive bar 7 is inserted into the corresponding welding holes and protrudes from the back side of the support plate 14. The electrode terminals contact and are welded to the exposed portions of the conductive bars from the back side of the support plate 14. In addition, the size of the welding holes is smaller than the size of the first conductive bars 6 and the second conductive bars 7, so that the support plate 14 surrounding the welding holes can support the first conductive bars 6 and the second conductive bars 7.

[0040] Corresponding to the arrangement of the electrode terminals, the column where the first conductive bar 6 is located and the column where the second conductive bar 7 is located are separated by a certain distance in the width direction F2, thereby leaving space between them for arranging the signal transmission line assembly 100.

[0041] In this embodiment, both the first conductive busbar 6 and the second conductive busbar 7 are fixed to the support plate 14 by thermal riveting. Specifically, the support plate 14 has a plurality of thermal riveting posts 11 protruding from its front side, and the first conductive busbar 6 and the second conductive busbar 7 have thermal riveting holes for the corresponding thermal riveting posts 11 to be inserted through. During manufacturing, after the thermal riveting posts 11 of the support plate 14 are inserted through the thermal riveting holes of the conductive busbars, the protruding portions of the thermal riveting posts 11 are thermally melted and expanded in diameter, thereby joining the conductive busbars to the support plate 14.

[0042] The first conductive busbar 6 and the second conductive busbar 7 can be aluminum busbars or copper busbars.

[0043] The signal transmission line assembly 100 is arranged on the front side of the support plate 14 and is located between the first conductive bar 6 and the second conductive bar 7. The signal transmission line assembly 100 also includes a plurality of through holes 4, and a plurality of first flexible flat cables 1 and a plurality of second flexible flat cables 2 bonded to the baseband 3. The baseband 3 includes a first surface 3A and a second surface 3B arranged opposite to each other in the thickness direction F3, and a first side 100C and a second side 100D arranged opposite to each other in the width direction F2.

[0044] The material forming the baseband 3 can be high-temperature resistant PI (Polyimide) or PC (Polycarbonate), and the surface of the baseband 3 can have an adhesive layer. Furthermore, the desired structural strength can be achieved by setting the thickness of the baseband 3 (e.g., 1 mm), thereby improving the structural integrity of the signal transmission line assembly 100.

[0045] Each first flexible flat cable 1 includes a first extension segment 1A extending along the length direction F1 and a second extension segment 1B extending from the end of the first extension segment 1A along the width direction F2. The first extension segment 1A is bonded to the first surface 3A of the base strip 3. Furthermore, the first extension segments 1A of the plurality of first flexible flat cables 1 are arranged in a partially stacked manner in the width direction F2, and the overlapping portions of any two adjacent first extension segments 1A are bonded to each other. The second extension segment 1B extends to the outside of the first side 100C of the base strip 3, and the portion (end) of the second extension segment 1B extending to the outside of the first side 100C is welded to the first conductive bus 6 via a first welding terminal 12. Additionally, on the outside of the first side 100C, the respective second extension segments 1B are spaced apart along the length direction F1, thereby corresponding to the positions of the respective first conductive bus 6.

[0046] Similar to the first flexible flat cable 1, each second flexible flat cable 2 includes a third extension segment 2A extending along the length direction F1 and a fourth extension segment 2B extending from the end of the third extension segment 2A along the width direction F2. The third extension segment 2A is bonded to the first surface 3A of the base strip 3. Furthermore, the first extension segments 1A of the plurality of second flexible flat cables 2 are arranged sequentially in a partially stacked manner along the width direction F2, and the overlapping portions of any two adjacent first extension segments 1A are bonded to each other. The fourth extension segment 2B extends to the outside of the second side 100D of the base strip 3, and the portion (end) of the fourth extension segment 2B extending to the outside of the second side 100D is welded to the second conductive bus 7 via a second welding terminal 13. Additionally, on the outside of the second side 100D, the fourth extension segments 2B are arranged at intervals F1 along the length direction, corresponding to the positions of the respective second conductive bus 7.

[0047] The surfaces where the first flexible flat cable 1, the second flexible flat cable 2, and the first surface 3A and adjacent cables are bonded are the flat surfaces of the cables, that is, one side surface of the flexible flat cable along the thickness direction F3.

[0048] Multiple through holes 4 are arranged spaced apart from each other along the length direction F1 between the aforementioned multiple first flexible flat cables 1 and multiple second flexible flat cables 2. Furthermore, each through hole 4 is respectively provided at the explosion-proof valve of each individual battery 2000 to provide a pressure relief channel when the explosion-proof valve is in operation. Additionally, in the width direction F2, each through hole 4 is positioned at the middle of the third spacing.

[0049] By bonding multiple partially stacked flexible flat cables to the baseband 3, numerous signal lines for transmitting signals can be arranged in a smaller space, enabling the CCS module 1000 to acquire a greater number of diverse signals from individual cells 2000. Furthermore, the flat structure of the flexible flat cables allows for secure bonding to the surface of the baseband 3 and above adjacent flexible flat cables. The baseband 3 maintains the relative positions of the various flexible flat cables, improving the neatness of the wiring and providing pressure relief and explosion-proof holes.

[0050] In this embodiment, the first extension segment 1A and the second extension segment 1B are formed by vertically folding the first flexible flat cable 1. For details, please refer to... Figure 5 The first flexible flat cable 1 is vertically folded at a predetermined position in the middle to form a first extension 1A and a second extension 1B. The folded portion of the first flexible flat cable 1 includes a first part 1Aa of a triangle formed on the first extension 1A (which is obscured and not visible in the figure) and a second part of a triangle formed on the second extension 1B. The first part 1Aa is stacked on top of the second part, that is, the second part is closer to the first part 1Aa than the first part 1Aa.

[0051] Similarly, the third extension 2A and the fourth extension 2B are formed by vertically folding the second flexible flat cable 2. For details, please refer to... Figure 6 The second flexible flat cable 2 is vertically folded at a predetermined position in the middle to form a third extension 2A and a fourth extension 2B. The folded portion of the second flexible flat cable 2 includes a third part 2Aa of a triangle formed on the third extension 2A (which is obscured and not visible in the figure) and a fourth part of a triangle formed on the fourth extension 2B. The third part 2Aa is stacked on top of the fourth part, that is, the third part 2Aa is closer to the first part 1Aa than the fourth part.

[0052] In other embodiments, the second portion is stacked on top of the first portion 1Aa, and the fourth portion is stacked on top of the third portion 2Aa.

[0053] In other embodiments, the first surface 3A of the baseband 3 is disposed facing the support plate 14, thereby covering the main body portions of the first flexible flat cable 1 and the second flexible flat cable 2 below the baseband 3.

[0054] Please see also Figure 3 and Figure 5 For any two adjacent first extension segments 1A corresponding to two first flexible flat cables 1, the portion of one first flexible flat cable 1 that is not overlapped with the other first flexible flat cable 1 is directly bonded to the first surface 3A of the baseband 3.

[0055] Similar to the first flexible flat cable 1, please refer to [the documentation / reference]. Figure 4 and Figure 6 For any two adjacent third extension segments 2A corresponding to two second flexible flat cables 2, the portion of one second flexible flat cable 2 that is not overlapped with the other second flexible flat cable 2 is directly bonded to the first surface 3A of the baseband 3.

[0056] Figure 7 The cross-sectional structures of a first flexible flat cable 1 and a second flexible flat cable 2 are schematically shown. Similar to conventional flexible flat cables, each of the first flexible flat cable 1 and the second flexible flat cable 2 includes a plurality of spaced-apart linear conductors 15 and an insulating film covering these linear conductors 15. The insulating film comprises two insulating film layers stacked in the thickness direction F3 and fixed together by an adhesive, with the linear conductors 15 sandwiched between these two film layers. In this way, the insulating film maintains the relative positions of the individual linear conductors 15, ensuring electrical isolation between them.

[0057] In addition, the second extension 1B of the first flexible flat cable 1 and the fourth extension 2B of the second flexible flat cable 2 are also bonded to the first surface 3A of the baseband 3. In this way, the position of the first flexible flat cable 1 and the second flexible flat cable 2 on the CCS assembly 1000 can be further stabilized, and the outward warping of the second extension 1B and the fourth extension 2B can be suppressed. Furthermore, this also helps to improve the appearance of the CCS assembly 1000 and the subsequent battery module.

[0058] The signal transmission line assembly 100 also includes a first end 100A and a second end 100B disposed opposite each other in the longitudinal direction F1. An electrical connector (not shown) is disposed at the first end 100A. Each of the first extension 1A and the third extension 2A (specifically, the linear conductor 15 in the extension) is electrically connected to the aforementioned electrical connector. In an implementation, this electrical connector is plugged into another electrical connector led out from the battery management system (BMS), thereby leading the signals (e.g., voltage and temperature signals) collected by the respective first flexible flat cables 1 and second flexible flat cables 2 from the first end 100A of the signal transmission line assembly 100 to the battery management system (BMS).

[0059] Figure 5 and Figure 6 This is a partially enlarged schematic diagram of the signal transmission line assembly 100 described above. It can be seen that for any two adjacent first extension segments 1A corresponding to two first flexible flat cables 1, the first extension segment 1A of one first flexible flat cable 1 covers a corner of the folded portion of the other first flexible flat cable 1 (more specifically, a corner of the first portion 1Aa), but does not cover the second extension segment 1B of that other first flexible flat cable 1; for any two adjacent third extension segments 2A corresponding to two second flexible flat cables 2, the third extension segment 2A of one second flexible flat cable 2 covers a corner of the folded portion of the other second flexible flat cable 2 (more specifically, a corner of the third portion 2Aa), but does not cover the fourth extension segment 2B of that other second flexible flat cable 2.

[0060] In other embodiments, please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of the signal transmission line assembly 100 in another embodiment. Figure 9 for Figure 8A partially enlarged schematic diagram of the signal transmission line assembly 100. In this embodiment, for any two adjacent first extension segments 1A corresponding to two first flexible flat cables 1, the first extension segment 1A of one first flexible flat cable 1 covers the fold (specifically the first portion 1Aa) and the second extension segment 1B of the other first flexible flat cable 1. Furthermore, for any two adjacent third extension segments 2A corresponding to two second flexible flat cables 2, the third extension segments 2A of the two second flexible flat cables 2 cover the fold (specifically the third portion 2Aa) and the fourth extension segment 2B of the other second flexible flat cable 2 (illustration omitted). It can be understood that, compared to... Figure 5 and Figure 6 The configuration shown enhances the conformability of the folded portion of the flexible flat cable as well as the second extension 1B and the fourth extension 2B.

[0061] In addition, this application embodiment also provides a battery pack, which includes a battery module with the above structure, a battery box that houses the battery module therein, and a battery management system (BMS), wherein the other end of the extended section of the flexible flat cable (first extension 1A, third extension 2A) is connected to the battery management system (BMS) via an electrical connector.

Claims

1. A signal transmission line assembly, characterized in that, include: The baseband includes a length direction, a width direction, and a thickness direction that are perpendicular to each other, and a first surface and a second surface disposed opposite to each other in the thickness direction; A plurality of first flexible flat cables, each first flexible flat cable including a first extension segment extending along the length direction and bonded to the first surface, and a second extension segment extending from the end of the first extension segment along the width direction, wherein the first extension segments of the plurality of first flexible flat cables are arranged in a partially stacked manner in the width direction, and the overlapping portions of any two adjacent first extension segments are bonded to each other. A plurality of second flexible flat cables, each second flexible flat cable including a third extension segment extending along the length direction and bonded to the first surface, and a fourth extension segment extending from the end of the third extension segment along the width direction, wherein the third extension segments of the plurality of second flexible flat cables are arranged in a partially stacked manner in the width direction, and the overlapping portions of any two adjacent third extension segments are bonded to each other. Multiple through holes are arranged spaced apart from each other along the length direction between the multiple first flexible flat cables and the multiple second flexible flat cables; The first extension segment and the second extension segment are formed by folding the first flexible flat cable. The folded portion of the first flexible flat cable includes a first part of a triangle formed on the first extension segment and a second part of a triangle formed on the second extension segment, wherein the first part and the second part are stacked. For any two adjacent first extension segments corresponding to two first flexible flat cables, the first extension segment of one first flexible flat cable covers the fold and second extension segment of the other first flexible flat cable.

2. The signal transmission line assembly according to claim 1, characterized in that, The third and fourth extensions are formed by folding the second flexible flat cable.

3. The signal transmission line assembly according to claim 2, characterized in that, The folded portion of the second flexible flat cable includes a third portion of a triangle formed on the third extension and a fourth portion of a triangle formed on the fourth extension, wherein the third portion and the fourth portion are stacked.

4. The signal transmission line assembly according to claim 3, characterized in that, The first part is bonded and fixed to the second part, and the third part is bonded and fixed to the fourth part.

5. The signal transmission line assembly according to claim 3, characterized in that, For any two adjacent third extensions corresponding to two second flexible flat cables, the third extension of one second flexible flat cable covers the fold and fourth extension of the other second flexible flat cable.

6. The signal transmission line assembly according to claim 3, characterized in that, For any two adjacent first extension segments corresponding to two first flexible flat cables, the portion of one first flexible flat cable that does not overlap with the other first flexible flat cable is directly bonded to the first surface. For any two adjacent third extension segments corresponding to the two second flexible flat cables, the portion of one second flexible flat cable that does not overlap with the other second flexible flat cable is directly bonded to the first surface.

7. The signal transmission line assembly according to claim 3, characterized in that, Both the second extension segment and the fourth extension segment are adhered to the first surface; For any two adjacent first extension segments corresponding to two first flexible flat cables, the first extension segment of one first flexible flat cable covers the first or second portion of the other first flexible flat cable. For any two adjacent third extensions corresponding to two second flexible flat cables, the third extension of one second flexible flat cable covers the third or fourth portion of the other second flexible flat cable.

8. The signal transmission line assembly according to any one of claims 1 to 7, characterized in that, The baseband has a first side and a second side disposed opposite to each other in the width direction, the second extension extends to the outside of the first side, and the fourth extension extends to the outside of the second side; On the outer side of the first side, a plurality of second extension segments are arranged spaced apart from each other along the length direction; On the outer side of the second side, a plurality of the fourth extension segments are arranged spaced apart from each other along the length direction.

9. A CCS component, characterized in that, include: Support plate; The signal transmission line assembly as described in any one of claims 1 to 8 is disposed on the support plate; Multiple first conductive bars are disposed on the support plate and arranged at intervals along the length direction. A plurality of second conductive bars are disposed on the support plate and spaced apart along the length direction, and the plurality of second conductive bars are spaced apart from the plurality of first conductive bars in the width direction; The second surface or the first surface is disposed on the support plate, the first extension and the third extension are located between the plurality of first conductive bars and the plurality of second conductive bars, the second extension is connected to the first conductive bar, and the fourth extension is connected to the second conductive bar.

10. A battery module, characterized in that, include: Multiple individual cells, each of which has an explosion-proof valve and electrode terminals arranged on a first side of the battery module; The CCS component as described in claim 9 is mounted on the first side; in, The plurality of explosion-proof valves are arranged spaced apart from each other along the length direction, and the plurality of through holes are respectively provided at the plurality of explosion-proof valves. The first conductive bar and the second conductive bar are electrically connected to the electrode terminals.

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