Flexible circuit board, electric connection module and installation method, and power battery pack

Abstract

The present application discloses a flexible circuit board, an electric connection module and an installation method, and a power battery pack. The flexible circuit board comprises a first sampling portion, a second sampling portion and a main body portion. The main body portion is separately connected to the first sampling portion and the second sampling portion. At least one of the first sampling portion and the second sampling portion is provided with a sampling point, and the main body portion is provided with a sampling signal output end. In a use state, at least a portion of the main body portion overlaps the first sampling portion and the second sampling portion.

Description

Flexible circuit boards, electrical connection modules and installation methods, and power battery packs

[0001] This application claims priority to Chinese Patent Application No. 202410691952.6, filed with the Chinese Patent Office on May 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power batteries, and in particular to a flexible circuit board, an electrical connection module and installation method, and a power battery pack. Background Technology

[0003] A power battery is a power source that provides power, often referring to the batteries that power electric vehicles, electric trains, and electric bicycles. To improve the safety of power batteries, sampling modules are often installed inside to collect data on the battery's voltage and temperature. Technical issues

[0004] Currently, for dual-row battery modules, a separate flexible printed circuit board (FPC) is often used to sample the two sets of cells separately. The FPC is then connected to a connector to output the sampling signal. The flexible circuit board has different connection parts; one part is connected to the cell, while the other part extends to the outer periphery of the dual-row cell module. In practical applications, the flexible circuit board occupies excessive space on the outer periphery of the dual-row cell module, encroaching on the space occupied by other components in the battery pack, thus increasing the overall size of the battery pack. Technical solutions

[0005] In a first aspect, this application provides a flexible circuit board, including a first sampling section, a second sampling section, and a main body section. The main body section is connected to the first sampling section and the second sampling section respectively. At least one of the first sampling section and the second sampling section is provided with a sampling point. The main body section is provided with a sampling signal output terminal.

[0006] The flexible circuit board is in a working state, in which at least a portion of the main body is stacked with the first sampling unit and the second sampling unit.

[0007] Secondly, this application also provides an electrical connection module, including a first connection component, a second connection component, a third connection component, and a flexible circuit board in the above-described usage state; wherein, the first sampling portion of the flexible circuit board is electrically connected to the first connection component and the second connection component, and the second sampling portion of the flexible circuit board is electrically connected to the second connection component and the third connection component.

[0008] Thirdly, this application also provides a method for installing an electrical connection module, comprising:

[0009] A carrier and a flexible circuit board in an initial state are provided; the flexible circuit board in the initial state includes a first sampling part, a main body part and a second sampling part arranged along a first direction, at least one of the first sampling part and the second sampling part is provided with a sampling point, and the main body part is provided with a sampling signal output terminal;

[0010] Fold the first and second sampling parts 180 degrees toward the first surface of the carrier;

[0011] Fold the main body 180 degrees toward the second surface of the carrier that is opposite to the first surface, so that a part of the main body is stacked with the first sampling part and another part of the main body is stacked with the second sampling part.

[0012] Fourthly, this application also provides a power battery pack, including a dual-row cell module and an electrical connection module as described above. The dual-row cell module is electrically connected to a first connection component, a second connection component, and a third connection component of the electrical connection module. The dual-row cell module is also connected to sampling points on a flexible circuit board.

[0013] Fifthly, this application also provides a power battery pack, including a dual-row cell module and a flexible circuit board. The flexible circuit board includes a first sampling section, a second sampling section, and a main body section. The main body section is connected to the first sampling section and the second sampling section respectively. At least one of the first sampling section and the second sampling section is provided with a sampling point. The main body section is provided with a sampling signal output terminal.

[0014] At least a portion of the main body, the first sampling part, and the second sampling part are disposed in the double-row cell module, and at least a portion of the main body is stacked with the first sampling part and the second sampling part in the double-row cell module. Beneficial effects

[0015] The beneficial effects of the flexible circuit board, electrical connection module, installation method, and power battery pack provided in this application are as follows: The flexible circuit board of this application can be stacked in its usage state, thereby greatly reducing the space occupied by the flexible circuit board on the outer periphery of the dual-row cell module. Even with reasonable stacking of each part of the flexible circuit board, it can occupy almost no space on the outer periphery of the dual-row cell module. This not only facilitates the design of other components, but also, for those skilled in the art, the flexible circuit board is generally thin, and the space occupied by the stacked flexible circuit boards in the cell thickness direction is limited, thus not affecting the cell thickness. At least one of the first and second sampling parts of the flexible circuit board of this application is provided with sampling points capable of collecting parameters of the dual-row cell module. The main body of the flexible circuit board is provided with a sampling signal output terminal. Therefore, this application can collect signals from the dual-row cell module through a single flexible circuit board, ensuring reliable connection between the flexible circuit board and the dual-row cell module, resulting in a safer power battery pack. Attached Figure Description

[0016] Figure 1 is a schematic diagram of a flexible circuit board provided in this application;

[0017] Figure 2 is a structural schematic diagram of the flexible circuit board shown in Figure 1 from another direction;

[0018] Figure 3 is a schematic diagram of a structure of the electrical connection module provided in this application;

[0019] Figure 4 is a structural schematic diagram of the electrical connection module shown in Figure 3 from another direction;

[0020] Figure 5 is a schematic diagram of the structure of the flexible circuit board shown in Figure 1 before it is folded over;

[0021] Figure 6 is a magnified view of a portion of region A shown in Figure 5;

[0022] Figure 7 is a schematic diagram of an electrical connection module after the flexible circuit board shown in Figure 5 has been folded once;

[0023] Figure 8 is a schematic diagram of an electrical connection module after the flexible circuit board shown in Figure 5 has undergone a second folding;

[0024] Figure 9 is an exploded structural diagram of an electrical connection module provided in this application;

[0025] Figure 10 is a flowchart illustrating an installation method for the electrical connection module provided in this application.

[0026] Figure 11 is a structural schematic diagram of a power battery pack provided in this application;

[0027] Figure 12 is a structural schematic diagram of the power battery pack shown in Figure 11 from another direction.

[0028] The reference numerals in the accompanying drawings of this application are explained as follows:

[0029] 1000, Power battery pack; 100, Electrical connection module; 200, Dual-row cell module; 10, Flexible circuit board; 20, First connection component; 30, Second connection component; 40, Third connection component; 50, Electrical signal output port; 60, Carrier; 70, Cover; 11, Main body; 12, First sampling unit; 13, Second sampling unit; 14, First reinforcing member; 15, Second reinforcing member; 16, Third reinforcing member; 61, First surface; 62, Second surface; 1 01. Sampling signal output terminal; 102. First temperature sampling point; 103. Second temperature sampling point; 104. First sampling point; 105. Second sampling point; 106. Third sampling point; 107. Fourth sampling point; 111. Main body section; 112. Extension section; 113. Positioning hole; S. Connection area; L1. First broken line; L2. Second broken line; L3. Third broken line; L4. Fourth broken line; H1. First direction; H2. Second direction; H3. Third direction. Embodiments of the present invention

[0030] Please refer to Figures 1 and 2. Figure 1 is a structural schematic diagram of the flexible circuit board 10 provided in an embodiment of this application, and Figure 2 is a structural schematic diagram of the flexible circuit board 10 shown in Figure 1 from another direction. The flexible circuit board 10 includes a main body 11, a first sampling part 12, and a second sampling part 13.

[0031] The main body 11 is connected to the first sampling unit 12 and the second sampling unit 13. The main body 11 is provided with a sampling signal output terminal 101. At least one of the first sampling unit 12 and the second sampling unit 13 is provided with a sampling point. For example, at least one of the first sampling unit 12 and the second sampling unit 13 is provided with a temperature sampling point for collecting the temperature of the dual-row battery cell module 200. The first sampling unit 12 is provided with a first temperature sampling point 102, and the second sampling unit 13 is provided with a second temperature sampling point 103. The flexible circuit board 10 is in a working state. In the working state, at least a portion of the main body 11 is stacked with the first sampling unit 12 and the second sampling unit 13.

[0032] As can be understood, as shown in Figures 1 and 2, in the usage state, the first sampling unit 12 and the second sampling unit 13 are disposed along the first direction H1 and are both bent and connected to the main body 11 to form a connection area S. At least a portion of the main body 11 is disposed on the first side of the first sampling unit 12 and the second sampling unit 13 in the second direction H2, and a portion of the main body 11 is stacked with at least one of the first sampling unit 12 and the second sampling unit 13 in the second direction H2. The main body 11, the first sampling unit 12, and the second sampling unit 13 are all disposed on the same side of the connection area S along the third direction H3. The first direction H1, the second direction H2, and the third direction H3 are all different. For example, they can be perpendicular to each other. The first direction H1 can be the width direction of the flexible circuit board 10 or the electrical connection module 100. The second direction H2 is the stacking direction from the main body 11 of the flexible circuit board 10 to the first sampling part 12 or the second sampling part 13. The second direction H2 can be the thickness direction of the flexible circuit board 10. The third direction H3 is the extension direction of the first sampling part 12 and the second sampling part 13. The third direction H3 can be the length direction of the flexible circuit board 10.

[0033] It is understood that in some embodiments, in the usage state, a portion of the main body 11 is stacked with the first sampling portion 12, and the remaining portion of the main body 11 is stacked with the second sampling portion 13. In this case, the main body 11 can be completely stacked with the first sampling portion 12 and the second sampling portion 13, resulting in a smaller size of the flexible circuit board 10 on the plane containing the first sampling portion 12 and the second sampling portion 13. Of course, in other embodiments, in the usage state, a portion of the main body 11 is stacked with the first sampling portion 12, a portion of the main body 11 is stacked with the second sampling portion 13, and a portion of the main body 11 is disposed between the first sampling portion 12 and the second sampling portion 13. In this case, the first sampling portion 12 and the second sampling portion 13 can be spaced apart, and the three connecting components of the electrical connection module 100 (described later) can be electrically connected to the two sampling portions, thereby enabling the flexible circuit board 10 of this application to adapt to and sample the dual-row battery cell module 200.

[0034] It is understood that, referring to Figures 1 and 2, and further referring to Figures 3 and 4, Figure 3 is a structural schematic diagram of the electrical connection module 100 provided in an embodiment of this application, and Figure 4 is a structural schematic diagram of the electrical connection module 100 shown in Figure 3 from another direction. The flexible circuit board 10 in its usage state is applied to the electrical connection module 100, which is electrically connected to the dual-row battery cell module 200. The electrical connection module 100 includes a first connection component 20, a second connection component 30, and a third connection component 40 arranged at intervals along a first direction H1. When the flexible circuit board 10 in its usage state is assembled to the electrical connection module 100, the main body 11 of the flexible circuit board 10 is located on one side of the electrical connection module 100, and the first sampling part 12 and the second sampling part 13 are located on the other side of the electrical connection module 100 along a second direction H2. The first sampling part 12 is located between the first connection component 20 and the second connection component 30 and is electrically connected to the first connection component 20 and the second connection component 30. The second sampling unit 13 is located between the second connecting component 30 and the third connecting component 40 and is electrically connected to the second connecting component 30 and the third connecting component 40.

[0035] In the usage state, at least a portion of the main body 11 of the flexible circuit board 10 of this application is stacked with the first sampling portion 12 and the second sampling portion 13. Compared with the related art where the flexible circuit board 10 extends excessively beyond the periphery of the double-row cell module 200, the flexible circuit board 10 of this application can be stacked in the usage state, which can greatly reduce the space occupied by the flexible circuit board 10 on the periphery of the double-row cell module 200. Even with reasonable stacking of each part of the flexible circuit board 10, it can occupy almost no space on the periphery of the double-row cell module 200. This not only benefits the design of other components, but also, for those skilled in the art, the flexible circuit board 10 is generally thin, and the space occupied by the stacked flexible circuit board 10 in the thickness direction of the double-row cell module 200 is limited, and it will not affect the thickness of the double-row cell module 200. Therefore, the flexible circuit board 10 of this application embodiment is smaller in size. This application can utilize the characteristics of the flexible circuit board 10 to reduce the space of the dual-row cell module 200 and improve the panelization utilization rate of the flexible circuit board 10. Furthermore, at least one of the first sampling part 12 and the second sampling part 13 of the flexible circuit board 10 of this application is provided with sampling points that can collect parameters of the dual-row cell module 200, and the main body 11 of the flexible circuit board 10 is provided with a sampling signal output terminal 101. Thus, this application can collect signals from the dual-row cell module 200 through a single flexible circuit board 10, and the connection between the flexible circuit board 10 and the dual-row cell module 200 is reliable, resulting in better safety of the final power battery pack 1000.

[0036] In some embodiments, the flexible circuit board 10 can be formed into the structure shown in FIG1 by folding twice. Referring to FIG1 to FIG4 and FIG5, FIG5 is a schematic diagram of the structure of the flexible circuit board 10 shown in FIG1 before folding. As shown in FIG5, the flexible circuit board 10 also has an initial state.

[0037] The flexible circuit board 10, in its initial state before being folded, can be approximated as an elongated strip extending along the first direction H1. In the initial state, the first sampling section 12, the main body section 11, and the second sampling section 13 are arranged and connected sequentially along the first direction H1. At this time, the flexible circuit board 10 is relatively long in the first direction H1. Referring to Figure 5 and Figure 6, which is a partial enlarged view of region A in Figure 5, the main body section 11 includes a first fold line L1, a third fold line L3, a fourth fold line L4, and a second fold line L2 arranged sequentially at intervals along the first direction H1. The first fold line L1 and the second fold line L2 are perpendicular to the first direction H1, while the third fold line L3 and the fourth fold line L4 are inclined to the first direction H1.

[0038] In some embodiments, the entire flexible circuit board 10, initially in its unfolded state, is folded 180 degrees along the third fold line L3 toward the second side of the first sampling section 12 and the second sampling section 13 to form the first sampling section 12 in the usage state shown in FIG1. ​​In other embodiments, the entire flexible circuit board 10, initially in its unfolded state, is folded 180 degrees along the fourth fold line L4 toward the second side of the first sampling section 12 and the second sampling section 13 to form the second sampling section 13 in the usage state shown in FIGS. 1 and 2. At this time, as shown in Figure 7, which is a structural schematic diagram of the electrical connection module 100 after the flexible circuit board 10 shown in Figure 5 has completed one fold, the first sampling unit 12 can be located between the first connecting component 20 and the second connecting component 30 and collect the signal (e.g. voltage signal) of the double-row battery cell module 200 electrically connected to the two connecting components. The second sampling unit 13 can be located between the second connecting component 30 and the third connecting component 40 and collect the signal (e.g. voltage signal) of the double-row battery cell module 200 electrically connected to the two connecting components. The flexible circuit board 10 can be a U-shaped structure, and the flexible circuit board 10 has completed the first fold.

[0039] Next, the main body 11 of the flexible circuit board 10, which has undergone one fold, is folded a second time by 180 degrees along the first fold line L1 and the second fold line L2 toward the first side of the first sampling section 12 and the second sampling section 13, thus forming the main body 11 in the usage state as shown in FIG8. FIG8 is a schematic diagram of the structure of the electrical connection module 100 after the flexible circuit board 10 shown in FIG5 has undergone two folds. At this time, a part of the main body 11 (e.g., the extension section 112 mentioned later) can extend to the outside of the electrical connection module 100 to transmit signals. Based on this, the flexible circuit board 10 in the initial state of this application can be formed into the flexible circuit board 10 in the usage state through a two-fold folding operation.

[0040] It is understandable that, considering that the dual-row battery cell module 200 and the electrical connection module 100 are often square structures, in this embodiment, the third fold line L3 of the flexible circuit board 10 can form a 45-degree angle with the first direction H1, and the first sampling part 12 is folded along the 45-degree angle and then set perpendicular to the main body 11. At this time, the bent first sampling part 12 is precisely positioned between the first connecting component 20 and the second connecting component 30 and is parallel to them. Similarly, in some embodiments, the fourth fold line L4 of the flexible circuit board 10 can form a 45-degree angle with the first direction H1, and the second sampling part 13 is folded along the 45-degree angle and then set perpendicular to the main body 11, so that the bent second sampling part 13 is precisely positioned between the second connecting component 30 and the third connecting component 40 and is parallel to them.

[0041] It should be noted that the third fold line L3 and the fourth fold line L4 can also form other angles with the first direction H1, such as, but not limited to, 30 degrees, 60 degrees, etc., and this application does not limit this. Furthermore, in addition to being formed by the secondary folding method provided in this application, the flexible circuit board 10 in the usage state can also be formed by other methods, such as, but not limited to, integral injection molding or integral cutting in the manufacturing process. The embodiments of this application do not limit the formation method of the flexible circuit board 10 in the usage state.

[0042] It should be noted that, when the flexible circuit board 10 of this embodiment is assembled onto the electrical connection module 100, it can either be formed into a usable flexible circuit board 10 by the two-folding method provided in this application, or the flexible circuit board 10 in its initial state can be formed into the usable flexible circuit board 10 shown in FIG. 1 first, and then assembled onto the electrical connection module 100. In other words, the usable flexible circuit board 10 of this application can be formed by two folds, and the flexible circuit board 10 can also be pre-formed into its final shape by the manufacturing process.

[0043] As shown in Figure 8, in the usage state, at least a portion of the main body 11 of the flexible circuit board 10 of this embodiment is stacked with the first sampling portion 12 and the second sampling portion 13. Compared to the flexible circuit board 10 shown in Figure 7, which extends excessively beyond the periphery of the double-row cell module 200, the flexible circuit board 10 shown in Figure 8, after being folded twice, can be stacked in the usage state. This greatly reduces the space occupied by the flexible circuit board 10 on the periphery of the double-row cell module 200. Even with reasonable stacking of each part of the flexible circuit board 10, it can occupy almost no space on the periphery of the double-row cell module 200. This not only benefits the design of other components, but also, for those skilled in the art, the flexible circuit board 10 is generally thin, and the space occupied by the stacked flexible circuit board 10 in the thickness direction of the double-row cell module 200 is limited, and it will not affect the thickness of the double-row cell module 200. Therefore, the flexible circuit board 10 of this application embodiment has a smaller volume. This application embodiment can utilize the characteristics of the flexible circuit board 10 to reduce the space of the double-row cell module 200 and improve the panelization utilization rate of the flexible circuit board.

[0044] Referring to Figures 1 to 8, the main body 11 of the flexible circuit board 10 may include a main body segment 111 and an extension segment 112.

[0045] The main body segment 111 is bent and connected to the first sampling unit 12 and the second sampling unit 13 respectively. A portion of the main body segment 111 is stacked with the first sampling unit 12, and a portion of the main body segment 111 is stacked with the second sampling unit 13. One end of the extension segment 112 is connected to the main body segment 111, and the other end of the extension segment 112 is bent relative to the main body segment 111 and extends along the first direction H1. The sampling signal output terminal 101 can be disposed in the extension segment 112, and the sampling signal output terminal 101 can be disposed at the end of the extension segment 112 away from the main body segment 111. A portion of the extension segment 112 is stacked with either the first sampling unit 12 or the second sampling unit 13.

[0046] It is understandable that, as shown in Figure 5, in the initial state where the flexible circuit board 10 is not folded, the extension segment 112 can be located on the same side of the main body segment 111 as the first sampling part 12. At this time, both the extension segment 112 and the first sampling part 12 extend along the first direction H1 and there is a gap between them. Of course, the extension segment 112 can also be located on the same side of the main body segment 111 as the second sampling part 13. Both the extension segment 112 and the second sampling part 13 extend along the first direction H1 and there is a gap between them. Among them, the length of the extension segment 112 along the first direction H1 can be relatively long, so that in the use state, the extension segment 112 and the sampling signal output terminal 101 can extend to the outside of the electrical connection module 100, and the sampling signal output terminal 101 can be more easily connected to the signal sampling point port of the sampling module. In the initial state, the flexible circuit board 10 of this embodiment is approximately elongated. The shape of the flexible circuit board 10 is relatively regular, the panel utilization rate of the flexible circuit board 10 is high, and the transportation is also more convenient.

[0047] Referring to Figures 1 to 8, at least one of the first sampling unit 12 and the second sampling unit 13 may be configured to collect voltage sampling points for the voltage parameters of the dual-row battery cell module 200. These voltage sampling points may include at least one of the first sampling point 104 to the fourth sampling point 107.

[0048] The first sampling section 12 is provided with one or more first sampling points 104 and one or more second sampling points 105. The first sampling points 104 and the second sampling points 105 can be disposed on opposite sides of the first sampling section 12. The first sampling point 104 is in contact with and electrically connected to the first connecting component 20, and the second sampling point 105 is in contact with and electrically connected to the second connecting component 30. The first connecting component 20, the first sampling section 12 and the second connecting component 30 can form an electrical connection path. Similarly, the second sampling section 13 is provided with one or more third sampling points 106 and one or more fourth sampling points 107. The third sampling points 106 and the fourth sampling points 107 can be disposed on opposite sides of the second sampling section 13. The third sampling point 106 is in contact with and electrically connected to the second connecting component 30, and the fourth sampling point 107 is in contact with and electrically connected to the third connecting component 40. The second connecting component 30, the second sampling section 13 and the third connecting component 40 can form an electrical connection path. The number of first sampling points 104 to fourth sampling points 107 can be adapted to the structure of the first connecting components 20 to the third connecting components 40. For example, in this embodiment, the first connecting component 20 includes four aluminum busbar structures, the second connecting component 30 includes six aluminum busbar structures, and the third connecting component 40 includes three aluminum busbar structures. In this case, the first sampling unit 12 may include four first sampling points 104 and two second sampling points 105, and the second sampling unit 13 may include four third sampling points 106 and three fourth sampling points 107. It should be noted that in other embodiments, this application may include other numbers of first sampling points 104 to fourth sampling points 107.

[0049] As can be understood, referring to Figures 1 through 8, the first sampling unit 12 may also have one or more first temperature sampling points 102, and the second sampling unit 13 may also have one or more second temperature sampling points 103. The first sampling unit 12 may include one or more first springs spaced apart from its body along a second direction H2, and the second sampling unit 13 may include one or more second springs spaced apart from its body along a second direction H2. Along the second direction H2, there is a height difference between the first springs and the body of the first sampling unit 12, and a height difference between the second springs and the body of the second sampling unit 13. A first temperature sampling point 102 may be located on one first spring, and a second temperature sampling point 103 may be located on one second spring. When the dual-row cell module 200 of the power battery pack 1000 is assembled with the electrical connection module 100 on the side of the first sampling part 12 and the second sampling part 13 away from the main body part 11, the first temperature sampling point 102 abuts against the dual-row cell module 200 and collects the cell temperature under the action of the first spring foot, and the second temperature sampling point 103 abuts against the dual-row cell module 200 and collects the cell temperature under the action of the second spring foot.

[0050] It is understood that the first temperature sampling point 102 and the second temperature sampling point 103 can be, but are not limited to, thermistor structures. The number of the first temperature sampling points 102 and the second temperature sampling points 103 can be designed according to the number of cells, cell distribution, temperature acquisition method, etc. included in the dual-row cell module 200. The number of the first temperature sampling points 102 and the second temperature sampling points 103 is not necessarily equal to the number of cells. In the embodiments of this application, the first sampling unit 12 and the second sampling unit 13 use spring feet to support the first temperature sampling points 102 and the second temperature sampling points 103. On the one hand, under the action of elastic force, the multiple temperature sampling points are in closer contact with the cells, and the collected temperature data is more accurate. On the other hand, the first temperature sampling points 102 and the second temperature sampling points 103 are spaced apart from the flexible circuit board 10 and the first connecting component 20 to the third connecting component 40, which can avoid the influence of these structures on the temperature sampling point acquisition data.

[0051] It is understandable that through holes and other structures can also be formed on the flexible circuit board 10. For example, as shown in Figures 1 to 8, the main body section 111 of the main body 11 is provided with a positioning hole 113, which can be adapted to the positioning post on the electrical connection module 100 to fix the flexible circuit board 10 onto the components such as the carrier 60 or the cover 70 described later. As another example, the first sampling section 12 and the second sampling section 13 of the flexible circuit board 10 can be provided with fixing holes, through which the connector can fix the dual-row battery cell module 200 to the electrical connection assembly.

[0052] In the usage state, at least a portion of the main body 11 of the flexible circuit board 10 is stacked with the first sampling unit 12 and the second sampling unit 13. This significantly reduces the space occupied by the flexible circuit board 10 on the outer periphery of the dual-row cell module 200, reduces the space of the dual-row cell module 200, facilitates the design of other components of the power battery pack 1000, and improves the utilization rate of the flexible circuit board. Furthermore, this application can collect signals from the dual-row cell module 200 with just one flexible circuit board 10, ensuring reliable connection between the flexible circuit board 10 and the dual-row cell module 200, resulting in a more secure power battery pack 1000.

[0053] Referring again to Figures 1 to 8, the flexible circuit board 10 may further include a first reinforcing member 14. This first reinforcing member 14 is disposed in the connection area S between the main body 11 and the first sampling part 12. For example, the first reinforcing member 14 may be disposed in relation to the third fold line L3. In some embodiments, the first reinforcing member 14 may be disposed between the main body 11 and the first sampling part 12 and be attached to the side of the main body 11 closest to the first sampling part 12. The main body 11, the first reinforcing member 14, and the first sampling part 12 are stacked along the second direction H2. The first reinforcing member 14 can reinforce the area at the third fold line L3 of the flexible circuit board 10 to increase the structural strength of the main body 11. In other embodiments, the first reinforcing member 14 may be disposed and connected to the side of the main body 11 facing away from the first sampling part 12. The first reinforcing member 14, the main body 11, and the first sampling part 12 are stacked along the second direction H2. Of course, in some other embodiments, the first reinforcing member 14 can be disposed between the main body 11 and the first sampling part 12 and be attached to the side of the main body 11 close to the first sampling part 12, or it can be disposed and connected to the side of the main body 11 away from the first sampling part 12.

[0054] Referring again to Figures 1 to 8, the flexible circuit board 10 may further include a second reinforcing member 15. The second reinforcing member 15 is disposed corresponding to the connection area S between the main body 11 and the second sampling part 13. For example, the second reinforcing member 15 may be disposed corresponding to the fourth fold line L4. In some embodiments, the second reinforcing member 15 may be disposed between the main body 11 and the second sampling part 13 and be attached to the side of the main body 11 near the second sampling part 13. The main body 11, the second reinforcing member 15, and the second sampling part 13 are stacked along the second direction H2. The second reinforcing member 15 can reinforce the area at the fourth fold line L4 of the flexible circuit board 10 to increase the structural strength of the main body 11. In other embodiments, the second reinforcing member 15 may be disposed and connected to the side of the main body 11 facing away from the second sampling part 13. The second reinforcing member 15, the main body 11, and the second sampling part 13 are stacked along the second direction H2. Of course, in some other embodiments, the second reinforcing member 15 may be disposed between the main body 11 and the second sampling part 13 and be attached to the side of the main body 11 close to the second sampling part 13, or it may be disposed and connected to the side of the main body 11 away from the second sampling part 13.

[0055] It is understood that the flexible circuit board 10 may include one or two of the first reinforcing member 14 and the second reinforcing member 15. Among them, at least one of the first reinforcing member 14 to the second reinforcing member 15 may be, but is not limited to, a general-purpose special rubber (CR foam).

[0056] It is understood that the shape of the first reinforcing member 14 can be adapted to the shape of the connection area S between the main body 11 and the first sampling part 12, and the shape of the second reinforcing member 15 can be adapted to the shape of the connection area S between the main body 11 and the second sampling part 13. For example, the first reinforcing member 14 and the second reinforcing member 15 can be triangular to adapt to the third broken line L3 and the fourth broken line L4 which are at a 45-degree angle to the first direction H1.

[0057] The flexible circuit board 10 of this application embodiment is provided with at least one of a first reinforcing member 14 and a second reinforcing member 15. The reinforcing member can strengthen and protect the bent area of ​​the flexible circuit board 10, and can improve the structural strength of the bent area of ​​the flexible circuit board 10.

[0058] Referring again to Figures 1 to 8, the flexible circuit board 10 may further include a third reinforcing member 16. The third reinforcing member 16 is disposed on the side of the main body 11 facing away from the second sampling unit 13, and is spaced apart from the first reinforcing member 14 and the second reinforcing member 15. The third reinforcing member 16 can increase the structural strength of the main body 11 and protect the main body 11.

[0059] It is understandable that the projected area of ​​the third reinforcing member 16 on the flexible circuit board 10 can be larger than the projected area of ​​the first reinforcing member 14 or the second reinforcing member 15 on the flexible circuit board 10, and the third reinforcing member 16 provides greater protection for the main body 11. The flexible circuit board 10 may include one or more (two or more) third reinforcing members 16. For example, as shown in Figure 3, the flexible circuit board 10 includes three third reinforcing members 16: one third reinforcing member 16 is disposed on the side of the main body segment 111 of the main body 11 facing away from the second sampling section 13, and the other two third reinforcing members 16 are disposed on the side of the extension segment 112 of the main body 11 facing away from the second sampling section 13. Multiple third reinforcing members 16 can better protect the flexible circuit board 10.

[0060] It is understood that the third reinforcing member 16 may be, but is not limited to, CR foam. The thickness of the third reinforcing member 16 along the second direction H2 is greater than the thickness of at least one of the first reinforcing member 14 and the second reinforcing member 15 along the second direction H2. For example, the first reinforcing member 14 and the second reinforcing member 15 may be 1mm CR foam, and the third reinforcing member 16 may be 2mm CR foam. The thicker third reinforcing member 16 provides better protection for the flexible panel. Furthermore, when the dual-row cell module 200 and the electrical connection module 100 are assembled to form the power battery pack 1000, the third reinforcing member 16 can be located on the back of the power battery pack 1000. The thicker third reinforcing member 16 can also prevent the cover 70 of the electrical connection module 100 from contacting other objects, thereby protecting the power battery pack 1000.

[0061] It is understood that the flexible circuit board 10 of this application may be, but is not limited to, a double-sided FPC structure. Along the second direction H2, the flexible circuit board 10 may sequentially include a positive electrode line protection film layer, a line surface layer + substrate surface layer, a reverse line protection film layer, and an epoxy glass cloth laminate layer (FR4 reinforcement layer).

[0062] In this embodiment, the flexible circuit board 10 in its usable state is formed by folding the initial state of the elongated flexible circuit board 10 twice. The flexible circuit board 10 has a simple structure, regular shape, and higher panel utilization. Simultaneously, a single flexible circuit board 10 can collect signals from the dual-row cell module 200, ensuring reliable connection between the flexible circuit board 10 and the dual-row cell module 200, resulting in better safety for the final power battery pack 1000. Furthermore, this application provides at least one of the first to third reinforcing members 14 in the folding area and the main body 11 area of ​​the flexible circuit board 10, further enhancing the structural strength of the flexible circuit board 10.

[0063] Based on the structure of the flexible circuit board 10 provided in this application, this application embodiment also provides an electrical connection module 100, as shown in Figures 3 and 4. The electrical connection module 100 includes a first connection component 20, a second connection component 30, a third connection component 40, and the flexible circuit board 10 in its usage state as provided in this application embodiment. The first sampling portion 12 of the flexible circuit board 10 is electrically connected to the first connection component 20 and the second connection component 30, and the second sampling portion 13 is electrically connected to both the second connection component 30 and the third connection component 40.

[0064] It is understood that the first connecting component 20, the second connecting component 30, and the third connecting component 40 can be arranged at intervals along the first direction H1. The first connecting component 20, the second connecting component 30, and the third connecting component 40 are electrically connected to the dual-row battery cell module 200. In the usage state, the main body 11 of the flexible circuit board 10 is disposed on one side of the electrical connection module 100. The first sampling unit 12 and the second sampling unit 13 are located on the same side of the main body 11 as the first connecting component 20 to the third connecting component 40 and are disposed on the other side of the electrical connection module 100 along the second direction H2. The first sampling unit 12 is disposed between the first connecting component 20 and the second connecting component 30 and electrically connected to both. The second sampling unit 13 is disposed between the second connecting component 30 and the third connecting component 40 and electrically connected to both.

[0065] It is understood that, referring again to Figures 1 to 8, the first connecting component 20 to the third connecting component 40 can be, but is not limited to, aluminum busbars. Of course, the three connecting components can also be other conductive structures. Each connecting component can include multiple connecting modules. For example, the first connecting component 20 can include four spaced-apart aluminum busbars, the second connecting component 30 can include six spaced-apart aluminum busbars, and the third connecting component 40 can include three spaced-apart aluminum busbars. The three connecting components include a total of 13 aluminum busbars, which can correspond one-to-one with the 13 sampling points on the flexible circuit board 10.

[0066] It is understood that the electrical connection module 100 also includes an electrical signal output port 50. In some embodiments, both the sampling signal output terminal 101 and the electrical signal output port 50 are located on the side of the first connection component 20 away from the second connection component 30. For example, two electrical signal output ports 50 extending outward from the first connection component 20 are provided on the side of the two aluminum busbars of the first connection component 20 away from the second connection component 30, and the extension segment 112 of the main body 11 of the flexible circuit board 10 can extend outward from the first connection component 20 in the direction of the first connection component 20, so that the sampling signal output terminal 101 and the electrical signal output port 50 are located on the same side of the first connection component 20. The two electrical signal output ports 50 can be positive and negative ports, and the two electrical signal output ports 50 can be connected to the corresponding aluminum busbars through springs, so as to facilitate the connection of the electrical signal output ports 50 with power ports, power boards, and other structures.

[0067] Referring to Figures 1 to 8 and especially Figure 9, Figure 9 is an exploded structural diagram of the electrical connection module 100 provided in this embodiment. The electrical connection module 100 also includes a carrier 60.

[0068] The first connecting component 20, the second connecting component 30, the third connecting component 40, the first sampling part 12, and the second sampling part 13 are located on the first surface 61 of the carrier 60, and the main body 11 is located on the second surface 62 of the carrier 60 along the second direction H2. The second surface 62 is disposed opposite to the first surface 61. The carrier 60 can be disposed between the main body 11 and other modules provided in this application. The carrier 60 can carry the first connecting component 20, the second connecting component 30, the third connecting component 40, the first sampling part 12, and the second sampling part 13. The carrier 60 can be, but is not limited to, a blister packing cover. The carrier 60 has an insulating structure to avoid structural crosstalk. The carrier 60 can also be a rectangular plate-shaped groove structure, which can confine the first connecting components 20 to 30, the first sampling part 12, and the second sampling part 13 within the groove structure.

[0069] As can be understood, as shown in Figure 9, the electrical connection module 100 also includes a cover 70, which is located on the side of the carrier 60 opposite to the main body 11. The cover 70, carrier 60, and main body 11 can be stacked along the second direction H2. The first connecting component 20, the second connecting component 30, the third connecting component 40, the first sampling part 12, and the second sampling part 13 can be located between the carrier 60 and the cover 70. The cover 70 and the carrier 60 can clamp and limit the first connecting component 20, the second connecting component 30, the third connecting component 40, the first sampling part 12, and the second sampling part 13 between the two housings. The carrier 60 and the cover 70 can also be provided with through-hole structures so that screws or other fasteners can fix the carrier 60, the cover 70, the flexible circuit board 10, the first connecting component 20, the second connecting component 30, and the third connecting component 40.

[0070] In this embodiment, the electrical connection module 100, with its carrier 60 and cover 70, limits and fixes multiple connection components and the flexible circuit board 10, resulting in better stability. The electrical connection module 100 acquires signals from the dual-row battery cell module 200 via a flexible circuit board 10. The connection between the flexible circuit board 10 and the dual-row battery cell module 200 is reliable, and the utilization rate of the flexible circuit board 10's panel layout is higher. Simultaneously, the sampling signal output terminal 101 and the electrical signal output port 50 are located on the same side of the electrical connection module 100, resulting in a smaller size and easier electrical connection with external sampling modules and power boards.

[0071] Based on the structure of the electrical connection module 100 provided in this application, this application embodiment also provides an installation method for the electrical connection module 100, which can assemble the electrical connection module 100. Referring to Figures 1 to 9 and Figure 10, Figure 10 is a schematic flowchart of the first installation method of the electrical connection module 100 provided in this application embodiment, which includes:

[0072] In S101, a carrier 60 and a flexible circuit board 10 in its initial state are provided;

[0073] The flexible circuit board 10 in its initial state can be approximated as an elongated strip extending along the first direction H1. The flexible circuit board 10 in its initial state includes a first sampling section 12, a main body section 11, and a second sampling section 13 arranged along the first direction H1. At least one of the first sampling section 12 and the second sampling section 13 is provided with a sampling point, and the main body section 11 is provided with a sampling signal output terminal 101.

[0074] In S102, the first sampling unit 12 and the second sampling unit 13 are folded 180 degrees toward the first surface 61 of the carrier 60;

[0075] In S103, the main body 11 is folded 180 degrees toward the second surface 62, which is opposite to the first surface 61 of the carrier 60, so that a part of the main body 11 is stacked with the first sampling part 12 and another part of the main body 11 is stacked with the second sampling part 13, and the flexible circuit board 10 can be put into use.

[0076] The flexible circuit board 10 can be transformed from its initial posture to its usage state by two folds. After the first sampling section 12 and the second sampling section 13 are folded toward the first surface 61, the flexible circuit board 10 can be in a first-fold state as shown in FIG. 7. The main body 11 of the flexible circuit board 10, which has completed the first fold, is located at the bottom of the U-shaped structure and is folded a second time by 180 degrees toward the second surface 62 of the carrier 60 to form the flexible circuit board 10 in its usage state as shown in FIG. 8. At this time, a part of the main body 11 (e.g., the extension 112 described later) can extend to the outside of the electrical connection module 100 to transmit signals.

[0077] It is understood that, in some embodiments, folding the main body 11 180 degrees toward the second surface 62 of the carrier 60, which is disposed opposite to the first surface 61, includes: folding the main body 11 180 degrees toward the second surface 62 of the carrier 60 along a first fold line L1 and a second fold line L2. The first fold line L1 and the second fold line L2 are perpendicular to the first direction H1.

[0078] It is understood that, in some embodiments, folding the first sampling section 12 and the second sampling section 13 180 degrees toward the first surface 61 of the carrier 60 includes: folding the first sampling section 12 180 degrees along the third fold line L3 toward the first surface 61 of the carrier 60; folding the second sampling section 13 180 degrees along the fourth fold line L4 toward the first surface 61 of the carrier 60; the third fold line L3 and the fourth fold line L4 are arranged alternately between the first fold line L1 and the second fold line L2.

[0079] It is understood that, in some embodiments, the installation method of the electrical connection module 100 of this application further includes: providing a first connection component 20, a second connection component 30, and a third connection component 40; disposing the first connection component 20 on the side of the first sampling portion 12 away from the second sampling portion 13, disposing the second connection component 30 between the first sampling portion 12 and the second sampling portion 13, and disposing the third connection component 40 on the side of the second sampling portion 13 away from the first sampling portion 12. In this case, the first sampling portion 12 can be located between the first connection component 20 and the second connection component 30 and electrically connected to both, and the second sampling portion 13 can be located between the second connection component 30 and the third connection component 40 and electrically connected to both.

[0080] The installation method of the electrical connection module 100 in this embodiment involves folding the main body 11 of the flexible circuit board 10, the first sampling part 12, and the second sampling part 13 toward different sides of the carrier 60. In the usage state, a portion of the main body 11 of the flexible circuit board 10 is stacked with the first sampling part 12, and another portion of the main body 11 is stacked with the second sampling part 13. This greatly reduces the space occupied by the flexible circuit board 10 on the outer periphery of the double-row cell module 200, reduces the space of the double-row cell module 200, and facilitates the design of other components of the power battery pack 1000. At the same time, the flexible circuit board 10 is small in size, which can improve the utilization rate of the flexible circuit board 10 and make the flexible circuit board 10 occupy less space in the electrical connection module 100 and the power battery pack 1000. The flexible circuit board 10 in this embodiment can achieve miniaturization design.

[0081] Based on the structure of the flexible circuit board 10 provided in this application, this application embodiment also provides a power battery pack 1000. Please refer to Figures 1 to 9, and specifically Figures 10 and 11. Figure 10 is a structural schematic diagram of the power battery pack 1000 provided in this application embodiment, and Figure 11 is a structural schematic diagram of the power battery pack 1000 shown in Figure 10 from another direction. The power battery pack 1000 includes a dual-row cell module 200 and an electrical connection module 100 provided in this application embodiment.

[0082] The dual-row cell module 200 is electrically connected to the first connection component 20, the second connection component 30, and the third connection component 40 of the electrical connection module 100 to form an electrical signal path. The electrical signal output port 50 can transmit the electrical signal transmitted through this electrical signal path to a power board or other structure. The dual-row cell module 200 is also electrically connected to the first connection component 20, the second connection component 30, the third connection component 40, and the flexible circuit board 10 to form an electrical signal path. For example, the dual-row cell module 200 can be connected to the voltage sampling point of the flexible circuit board 10 via a foil (e.g., aluminum foil). The sampling signal output terminal 101 can transmit the collected electrical signal (e.g., voltage signal) to a sampling module or other structure. The dual-row cell module 200 is also connected to sampling points of the flexible circuit board 10, such as the first temperature sampling point 102 and the second temperature sampling point 103. The flexible circuit board 10 can collect the temperature of the dual-row cell module 200.

[0083] It is understood that the dual-row cell module 200 is connected to the first connecting assembly 20 to the third connecting assembly 40, as well as the first sampling unit 12 and the second sampling unit 13, on the side of the cover 70 facing away from the carrier 60. Specifically, one row of cells in the dual-row cell module 200 is connected to the first connecting assembly 20 and the second connecting assembly 30 and is also connected to the first sampling unit 12; the other row of cells is connected to the second connecting assembly 30 and the third connecting assembly 40 and is also connected to the second sampling unit 13. The dual-row cell module 200 can form a dual-row module with two parallel and twelve serial connections. The first connecting assembly 20 to the third connecting assembly 40 can be provided with a total of 13 aluminum busbars to achieve electrical connection with 12 cells. The first sampling unit 12 and the second sampling unit 13 are provided with a total of 13 sampling points to achieve sampling of the dual-row cell module 200.

[0084] It is understood that during the assembly process of the power battery pack 1000 of this application, the first connecting component 20 to the second connecting component 30 can be first placed in the groove on the front side of the carrier 60; then the elongated flexible circuit board 10 in its initial state is folded once, and the first sampling part 12 is bent between the first connecting component 20 and the second connecting component 30, and the second sampling part 13 is bent between the second connecting component 30 and the third connecting component 40; then the flexible circuit board 10 is folded a second time to form the flexible circuit board 10 in its use state, and the main body is made... Part 11 is attached to the back of the carrier 60; then the cover 70 is placed on the front of the carrier 60, and the carrier 60, cover 70, flexible circuit board 10 and first connecting component 20 to third connecting component 40 are connected and fixed by fasteners to form an electrical connection module 100; next, the double-row cell module 200 is fastened to the front of the carrier 60 and the double-row cell module 200 is connected and electrically connected to the first connecting component 20 to third connecting component 40, as well as the first sampling part 12 and the second sampling part 13, to finally form a power battery pack 1000.

[0085] The power battery pack 1000 of this application embodiment collects electrical and temperature signals from the dual-row cell module 200 through a flexible circuit board 10. The flexible circuit board 10 has a higher panel utilization rate and the electrical connection of the power battery pack 1000 is more reliable.

[0086] Based on the structure of the flexible circuit board 10 provided in this application, this application embodiment also provides a power battery pack 1000. The power battery pack 1000 includes a dual-row cell module 200 and a flexible circuit board 10. The flexible circuit board 10 includes a first sampling part 12, a second sampling part 13, and a main body part 11. The main body part 11 is connected to the first sampling part 12 and the second sampling part 13 respectively. At least one of the first sampling part 12 and the second sampling part 13 is provided with a sampling point. The main body part 11 is provided with a sampling signal output terminal 101. At least a portion of the main body part 11, the first sampling part 12, and the second sampling part 13 are disposed in the dual-row cell module 200, and at least a portion of the main body part 11 is stacked with the first sampling part 12 and the second sampling part 13 in the dual-row cell module 200.

[0087] It is understandable that the main body 11, the first sampling part 12 and the second sampling part 13 can all be disposed in the double-row cell module 200 so that the flexible circuit board 10 hardly occupies any additional peripheral space of the double-row cell module 200.

[0088] In the power battery pack 1000 of this application embodiment, the flexible circuit board 10 can be stacked on the double-row cell module 200, which can greatly reduce the space occupied by the flexible circuit board 10 on the outer periphery of the double-row cell module 200. The embodiment of this application can utilize the characteristics of the flexible circuit board 10 to reduce the space of the double-row cell module 200 and improve the panelization utilization rate of the flexible circuit board.

[0089] It should be noted that the flexible circuit board 10, electrical connection module 100, and power battery pack 1000 of this application are different protected entities under the same inventive concept. Structures not described in detail in the embodiments of electrical connection module 100 and power battery pack 1000 can be referred to the description of the flexible circuit board 10 embodiment. Furthermore, the multiple embodiments provided in this application can be arbitrarily combined without conflict to form new embodiments, which are also within the protection scope of the embodiments of this application.

[0090] Based on the flexible circuit board 10, electrical connection module 100, and power battery pack 1000 provided in this application, the power battery pack 1000 and electrical connection module 100 can collect electrical and temperature signals from the dual-row cell module 200 through a single flexible circuit board 10. This solution eliminates the need for connectors to achieve electrical connection between the flexible circuit board 10 and the dual-row cell module 200, significantly ensuring product reliability. Furthermore, it allows the entire flexible circuit board 10, electrical connection module 100, and power battery pack 1000 to be supplied and installed as a single unit, improving production efficiency. Moreover, the single-fold design in related technologies results in low FPC material utilization; the application of the double-fold flexible circuit board 10 in this application increases FPC material panelization utilization by 30%.

Claims

1. A flexible circuit board, comprising a first sampling part, a second sampling part and a main body part, the main body part being connected with the first sampling part and the second sampling part respectively, at least one of the first sampling part and the second sampling part being provided with a sampling point, and the main body part being provided with a sampling signal output end; wherein the flexible circuit board having a use state, in which at least a part of the main body part is stacked with the first sampling part and the second sampling part.

2. The flexible circuit board of claim 1, wherein, In the use state, the main body part is arranged on the same side of the first sampling part and the second sampling part, and: a part of the main body part is stacked with the first sampling part, and the remaining part of the main body part is stacked with the second sampling part; or a part of the main body part is stacked with the first sampling part, a part of the main body part is stacked with the second sampling part, and a part of the main body part is located between the first sampling part and the second sampling part. 3.The flexible circuit board according to claim 1, further comprising at least one of a first reinforcing member and a second reinforcing member; wherein the first reinforcing member is arranged corresponding to a connection region of the main body part and the first sampling part and is connected with the main body part; the first reinforcing member corresponding to the positional relationship between the main body part and the first sampling part is any one or a combination of both of the following: the first reinforcing member is arranged between the main body part and the first sampling part; the first reinforcing member is arranged on a side of the main body part away from the first sampling part; the second reinforcing member is arranged corresponding to a connection region of the main body part and the second sampling part and is connected with the main body part; the second reinforcing member corresponding to the positional relationship between the main body part and the second sampling part is any one or a combination of both of the following: the second reinforcing member is arranged between the main body part and the second sampling part; the second reinforcing member is arranged on a side of the main body part away from the second sampling part. 4.The flexible circuit board according to claim 3, further comprising a third reinforcing member, the third reinforcing member being arranged on and connected to a side of the main body part away from the second sampling part.

5. The flexible circuit board of claim 4, wherein, The thickness of the third reinforcing member is greater than the thickness of at least one of the first reinforcing member and the second reinforcing member.

6. The flexible circuit board of claim 1, wherein, The main body part comprises: a main body segment, being bent and connected with the first sampling part and the second sampling part respectively, a part of the main body segment being stacked with the first sampling part, and a part of the main body segment being stacked with the second sampling part; and an extension segment, one end of the extension segment being connected with the main body segment, and the other end of the extension segment extending along a direction in which the first sampling part or the second sampling part is located, so that a part of the extension segment is stacked with the first sampling part or the second sampling part; wherein the sampling signal output end is arranged on the other end of the extension segment.

7. The flexible circuit board of claim 6, wherein, A positioning hole is arranged on the main body segment, and the positioning hole is adapted to a positioning column of an electrical connection module.

8. The flexible circuit board according to any one of claims 1 to 7, further comprising an initial state in which the first sampling portion, the main body portion, and the second sampling portion are sequentially arranged and connected in a first direction.

9. The flexible circuit board of claim 8, wherein, The main body portion comprises a first fold line and a second fold line arranged in the first direction, the first fold line and the second fold line being perpendicular to the first direction; wherein, The main body portion in the initial state is folded by 180 degrees along the first fold line and the second fold line in a direction away from a first side on which the first sampling portion and the second sampling portion are located to form the main body portion in the use state.

10. The flexible circuit board of claim 9, the body portion further comprising any one or a combination of two of a third fold line and a fourth fold line: the body portion further comprising a third fold line spaced apart from the first fold line and the second fold line along the first direction; wherein, The first sampling portion in the initial state is folded by 180 degrees along the third fold line in a direction toward a second side opposite to the first side to form the first sampling portion in the use state. The main body portion further comprises a fourth fold line arranged in the first direction between the first fold line and the second fold line; wherein the second sampling portion in the initial state is folded by 180 degrees along the fourth fold line in a direction toward the second side to form the second sampling portion in the use state.

11. The flexible circuit board of claim 10, wherein, When the main body portion comprises the third fold line, the third fold line forms an angle of 45 degrees with the first direction; When the main body portion comprises the fourth fold line, the fourth fold line forms an angle of 45 degrees with the first direction; When the main body portion comprises the third fold line and the fourth fold line, the third fold line and the fourth fold line form an angle of 45 degrees with the first direction.

12. An electrical connection module comprising a first connection assembly, a second connection assembly, a third connection assembly, and a flexible circuit board in use as claimed in any one of claims 1 to 11; wherein, The first sampling portion of the flexible circuit board is electrically connected with the first connecting component and the second connecting component, and the second sampling portion of the flexible circuit board is electrically connected with the second connecting component and the third connecting component.

13. The electrical connection module according to claim 12, further comprising a carrier, the first connecting component, the second connecting component, the third connecting component, the first sampling portion, and the second sampling portion being located on a first surface of the carrier, and the main body portion being located on a second surface of the carrier opposite to the first surface; wherein, The first connecting component, the second connecting component, and the third connecting component are arranged in the first direction, the first sampling portion is arranged between the first connecting component and the second connecting component, and the second sampling portion is arranged between the second connecting component and the third connecting component.

14. The electrical connection module according to claim 12, further comprising an electrical signal output port, the sampling signal output and the electrical signal output port being located on a side of the first connecting component away from the second connecting component.

15. A method for installing an electrical connection module, comprising: providing a carrier and a flexible circuit board in an initial state, the flexible circuit board in the initial state comprising a first sampling portion, a main body portion, and a second sampling portion arranged in a first direction, at least one of the first sampling portion and the second sampling portion being provided with a sampling point, and the main body portion being provided with a sampling signal output; folding the first sampling part and the second sampling part by 180 degrees towards the first surface of the carrier; folding the main part by 180 degrees towards the second surface of the carrier opposite to the first surface, so that a part of the main part is arranged in a stack with the first sampling part, and another part of the main part is arranged in a stack with the second sampling part.

16. The method of installing an electrical connection module according to claim 15, wherein, The folding of the main part by 180 degrees towards the second surface of the carrier opposite to the first surface comprises: folding the main part by 180 degrees along a first folding line and a second folding line towards the second surface of the carrier; the first folding line and the second folding line are perpendicular to the first direction.

17. The method of installing an electrical connection module according to claim 15, wherein, The folding of the first sampling part and the second sampling part by 180 degrees towards the first surface of the carrier comprises: folding the first sampling part by 180 degrees along a third folding line towards the first surface of the carrier; folding the second sampling part by 180 degrees along a fourth folding line towards the first surface of the carrier; the third folding line and the fourth folding line are arranged between the first folding line and the second folding line.

18. The installation method of the electric connection module according to claim 15, further comprising: providing a first connection assembly, a second connection assembly and a third connection assembly; arranging the first connection assembly on a side of the first sampling part away from the second sampling part, arranging the second connection assembly between the first sampling part and the second sampling part, and arranging the third connection assembly on a side of the second sampling part away from the first sampling part.

19. A power battery pack comprising a double-row battery cell module and the electric connection module according to any one of claims 13 to 16, the double-row battery cell module being electrically connected with the first connection assembly, the second connection assembly and the third connection assembly of the electric connection module, and the double-row battery cell module being further connected with the sampling points of the flexible circuit board.

20. A power battery pack comprising a double-row battery cell module and a flexible circuit board, the flexible circuit board comprising a first sampling part, a second sampling part and a main part, the main part being connected with the first sampling part and the second sampling part respectively, at least one of the first sampling part and the second sampling part being provided with a sampling point, and the main part being provided with a sampling signal output end; wherein at least a part of the main part, the first sampling part and the second sampling part is arranged in the double-row battery cell module, and at least a part of the main part is arranged in a stack with the first sampling part and the second sampling part in the double-row battery cell module.

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