CN220628165U - FPC acquisition device and battery module - Google Patents

Abstract

The application provides a FPC collection system and battery module, FPC collection system includes: the FPC board is in a strip shape and comprises a first FPC section, a second FPC section and a third FPC section which are sequentially connected along the length direction of the FPC board, the first FPC section is attached to the first surface of the battery module body, the second FPC section is formed after being folded and bent relative to the first FPC section, the second FPC section is attached to the second surface of the battery module body, the third FPC section is formed after being folded and bent relative to the second FPC section, and the third FPC section is attached to the third surface of the battery module body; the signal acquisition sheet is arranged at the first FPC segment; the signal output interface is arranged at the third FPC segment. The application does not need to adopt the FPC board similar to the Z shape, but adopts the strip FPC board instead, thereby reducing the material cost for manufacturing the FPC board.

Description

FPC acquisition device and battery module

Technical field

This application relates to the field of battery technology, specifically to FPC collection devices and battery modules.

Background technique

In related technology, most of the FPC boards (Flexible Printed Circuit, flexible circuit boards) in battery modules are set on the side of the battery module body. By bending a portion of the FPC board at 90° to the upper surface of the battery module body, surface, and then bend part of the FPC segment on the upper surface at 90° to the front surface of the battery module body, so that the signals collected by the FPC board can be output from the front surface of the battery module body.

However, the plane shape of this kind of FPC board is generally similar to a "Z" shape. When making this kind of FPC board, it is necessary to use a die to cut off a large area of FPC material without wiring, which will cause a waste of FPC material and thus increase the cost. Material cost for making FPC board.

Therefore, how to reduce the material cost of making FPC boards is an urgent technical problem that needs to be solved for current battery modules.

Utility model content

Embodiments of the present application provide an FPC collection device and a battery module, which can reduce the material cost of making FPC boards.

In a first aspect, embodiments of the present application provide an FPC collection device. The FPC collection device includes:

The FPC board is in the shape of a long strip and includes a first FPC segment, a second FPC segment and a third FPC segment connected in sequence along the length direction of the FPC board. The first FPC segment, the second FPC segment and the The third FPC segment is integrally formed, the first FPC segment is attached to the first surface of the battery module body, and is folded and bent relative to the first FPC segment to form the second FPC segment. The second FPC segment is attached to the second surface of the battery module body, and is folded and bent relative to the second FPC segment to form the third FPC segment. The third FPC segment is attached to the The third surface of the battery module body, the first surface, the second surface and the third surface are mutually adjacent surfaces;

A signal acquisition piece is arranged at the first FPC segment;

A signal output interface is provided at the third FPC segment.

In one embodiment, the folding direction of the second FPC segment relative to the first FPC segment is inclined to the length direction of the FPC board, and the folding direction of the third FPC segment relative to the second FPC segment Inclined to the length direction of the FPC board.

In one embodiment, the angle formed by the direction of the fold when the second FPC segment is folded relative to the first FPC segment and the length direction of the FPC board is 45°, and the third FPC segment The angle formed by the direction of the fold when the second FPC segment is folded and the length direction of the FPC board is 45°.

In one embodiment, the first FPC segment is provided with a groove on one side facing the second surface, the first FPC segment includes an “S”-shaped connector, and the “S”-shaped connector is provided with In the groove, the "S"-shaped connector includes a first end and a second end, the first end is fixed to the first side wall of the groove, and the signal collection piece is fixed at the second end.

In one embodiment, the cross section of the first FPC segment includes a first protective film layer, an FPC substrate layer, a cover film layer and a second protective film layer that are stacked in sequence, and the first protective film layer is located at the The first FPC segment is close to one side of the battery module body, and one end of the signal collection piece is fixed between the FPC base material layer and the cover film layer at the second end.

In one embodiment, the second end is connected to the second side wall of the groove through a micro-connection section, and the second side wall is opposite to the first side wall.

In one embodiment, a positioning hole is provided on the side of the groove away from the "S"-shaped connector, and the positioning hole penetrates the first protective film layer, the FPC base material layer, and the Covering the film layer and the second protective film layer, the positioning hole is used for the positioning post on the battery module body to pass through.

In one embodiment, the signal acquisition piece includes a first signal acquisition segment and a second signal acquisition segment, and the first signal acquisition segment and the second signal acquisition segment are connected in sequence along the length direction of the signal acquisition piece. , the first signal acquisition segment is disposed on the first surface, and the end of the first signal acquisition segment away from the second signal acquisition segment is fixed to the second end, relative to the first signal acquisition segment A signal collection segment is bent to form the second signal collection segment, the second signal collection segment is attached to the second surface, and the end of the second signal collection segment away from the first signal collection segment A bus bar fixed on the second surface.

In one embodiment, the distance between the fold and the second end when the second signal collection segment is bent relative to the first signal collection segment is greater than or equal to a preset distance.

In a second aspect, embodiments of the present application provide a battery module. The battery module includes a battery module body and an FPC collection device as described in any one of the above. The FPC collection device is used to collect the Battery status signal in the main body of the battery module.

Beneficial effects of the embodiments of the present application:

In the embodiment of the present application, a strip-shaped FPC board is used, and the strip-shaped FPC board is divided into three FPC segments. Through folding and bending between the FPC segments, one of the FPC segments is pasted Combined to other adjacent surfaces of the battery module body, the signal collected by the FPC board can finally be output from the third FPC segment that is attached to the third surface of the battery module body without using a "Z" shape. Compared with FPC boards similar to the "Z" shape, long FPC boards waste less material, thereby reducing the material cost of making FPC boards.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the overall structure of the FPC collection device and the main body of the battery module provided by the embodiment of the present application;

Figure 2 is a detailed structural diagram of area A in Figure 1;

Figure 3 is a schematic diagram of the unfolded structure of the FPC board in Figure 1;

Figure 4 is a schematic structural diagram of the FPC board in Figure 1 after folding and bending;

Figure 5 is a detailed structural diagram of area B in Figure 1;

Figure 6 is a schematic plan view of some structures in the first FPC segment of Figure 5;

Figure 7 is a schematic diagram of the stacked structure in a cross-section of the first FPC segment;

FIG. 8 is another detailed structural diagram of area B in FIG. 1 .

Explanation of reference symbols:

1. FPC acquisition device; 10. FPC board; 11. First FPC fragment; 12. Second FPC fragment; 13. Third FPC fragment; 14. First dotted line; 15. Second dotted line; 16. Third dotted line; 17. Fourth dotted line; 18. Groove; 181. First side wall; 182. Second side wall; 183. Positioning hole; 19. "S" shaped connector; 191. First end; 192. Second End; 193. Micro-connection section; 111. First protective film layer; 112. FPC base material layer; 113. Covering film layer; 114. Second protective film layer; 20. Signal collection piece; 21. First signal collection Fragment; 22. Second signal collection fragment; 23. The crease when the second signal collection fragment 22 is bent relative to the first signal collection fragment 21; 30. Signal output interface; 2. Battery module body; 3. Positioning column ; 4. Bus bar.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of this application. In addition, it should be understood that the specific embodiments described here are only used to illustrate and explain the application, and are not used to limit the application. In this application, unless otherwise specified, the directional words used such as "upper" and "lower" usually refer to the upper and lower positions of the device in actual use or working conditions, specifically the direction of the drawing in the drawings. ; while “inside” and “outside” refer to the outline of the device.

In order to reduce the material cost of making FPC boards, embodiments of the present application provide an FPC collection device and a battery module, which adopts a long FPC board and divides the long FPC board into three FPC segments. Through the FPC segments and Folding and bending between FPC segments, one of the FPC segments is attached to other adjacent surfaces of the battery module body, and finally the signal collected by the FPC board can be collected from the third surface that is attached to the third surface of the battery module body. Three FPC segments are output to the outside without using a "Z"-shaped FPC board. Compared with a "Z"-shaped FPC board, a long FPC board wastes less material, thereby reducing the cost of making FPC boards. The material cost is reduced, and redundant cutting processes are not required, which reduces the processing cycle of the FPC board. Please refer to the detailed description below for specific solutions.

In a first aspect, embodiments of the present application provide an FPC collection device. Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of the overall structure of the FPC collection device 1 and the battery module body 2. Figure 2 is a detailed structural diagram of area A in Figure 1. As can be seen from Figures 1 and 2, the FPC acquisition device 1 includes a signal acquisition piece 20, an FPC board 10 and a signal output interface 30. The signal acquisition piece 20 is generally a nickel piece. The signal acquisition piece 20 is used to collect the battery status signal in the battery module body 2. The battery status signal is generally a signal that records the current voltage of the battery, the current temperature of the battery, etc. The FPC board 10 is used to transmit the battery status signal collected by the signal acquisition chip 20 to the signal output interface 30 so as to output the battery status signal from the signal output interface 30 to the outside. For example, the signal output interface 30 can be connected to a BMS outside the battery module. (Battery Management System, battery management system) to facilitate the BMS to monitor and manage the status of the battery in the battery module body 2. The battery module body 2 houses a battery, and the battery is used to provide electric energy to the outside, for example, to provide electric energy to an electric vehicle.

Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the unfolded structure of the FPC board 10 in Figure 1. Figure 4 is a schematic structural diagram of the FPC board 10 in Figure 1 after being folded and bent. It can be seen from Figure 3 that the unfolded FPC board 10 is in a long strip shape and includes a first FPC segment 11, a second FPC segment 12 and a third FPC segment 13 connected in sequence along the length direction of the FPC board 10, and the first FPC segment The segment 11, the second FPC segment 12 and the third FPC segment 13 are integrally formed. In this way, a long strip of FPC board 10 can be cut directly with a die, thereby avoiding the waste of FPC materials. The length direction of the FPC board 10 is exemplified as the direction from right to left in FIG. 3 .

Referring to Figures 2 and 4, the first FPC segment 11 is bonded to the first surface of the battery module body 2, the second FPC segment 12 is bonded to the second surface of the battery module body 2, and the third FPC segment 13 is bonded to On the third surface of the battery module body 2, in this way, by arranging the signal collection piece 20 at the first FPC segment 11 and the signal output interface 30 at the third FPC segment 13, it is possible to realize the acquisition from the battery module body 2 The third surface outputs the battery status signal to the outside. The first surface, the second surface and the third surface are mutually adjacent surfaces. In Figure 2, the first surface is an example of a side surface of the battery module body 2, and the second surface is an example of the upper surface of the battery module body 2. An example of the third surface is the front surface of the battery module body 2 . In order to describe the FPC collection device in the embodiment of the present application more specifically, one side surface, the upper surface and the front surface of the battery module body 2 shown in Figure 2 are used instead of the first surface, the second surface and the third surface. Describe the following content, as follows:

Referring to FIGS. 3 and 4 , the second FPC segment 12 is formed after being folded and bent relative to the first FPC segment 11 . The second FPC segment 12 is attached to the upper surface of the battery module body 2 , where folding refers to bending. After folding, they overlap at least partially, that is, the bending angle is 180°, and bending means that they do not overlap after bending, but form a certain angle, that is, the bending angle is less than 180°. In FIG. 3 , since the first FPC segment 11 is attached to one side of the battery module body 2 , the second FPC segment 12 can be folded relative to the first FPC segment 11 along the first dotted line 14 first, and then the second FPC segment 12 can be folded along the first dotted line 14 . The two FPC segments 12 are bent along the second dotted line 15 relative to the first FPC segment 11, forming the relative positional relationship between the second FPC segment 12 and the first FPC segment 11 in Figure 4, so that the second FPC segment 12 fits on the upper surface of the battery module body 2.

Similarly, the third FPC segment 13 is formed after being folded and bent relative to the second FPC segment 12 , and the third FPC segment 13 is attached to the front surface of the battery module body 2 . Specifically, in FIG. 3 , after the second FPC segment 12 is attached to the upper surface of the battery module body 2 , the third FPC segment 13 can first be folded relative to the second FPC segment 12 along the third dotted line 16 . The third FPC segment 13 is then bent along the fourth dotted line 17 relative to the second FPC segment 12, forming the relative positional relationship between the third FPC segment 13 and the second FPC segment 12 in Figure 4, so that the third FPC segment 13 is attached to the front surface of the battery module body 2 .

In some embodiments of the present application, in FIG. 3 , the folding direction of the second FPC segment 12 relative to the first FPC segment 11 (ie, the normal direction of the first dotted line 14 in the plane where the FPC board 10 is located) is inclined to the FPC The length direction of the board 10 is such that the folded second FPC segment 12 can be attached to the upper surface of the battery module body 2 by bending. Similarly, in Figure 3, the folding direction of the third FPC segment 13 relative to the second FPC segment 12 (ie, the normal direction of the third dotted line 16 in the plane where the FPC board 10 is located) is inclined to the length direction of the FPC board 10, So that the folded third FPC segment 13 can be attached to the front surface of the battery module body 2 by bending.

In a further embodiment, in FIG. 3 , the folding direction of the second FPC segment 12 relative to the first FPC segment 11 is parallel to the folding direction of the third FPC segment 13 relative to the second FPC segment 12 , that is, the first dotted line 14 parallel to the third dotted line 16, so that after the second FPC segment 12 is folded and bent from the side of the battery module body 2 and attached to the upper surface of the battery module body 2, the third FPC segment 13 can also be folded from the battery module body 2. The upper surface of the module body 2 is folded and bent to fit to the front surface of the battery module body 2 .

In a further embodiment, in FIG. 3 , the angle between the crease when the second FPC segment 12 is folded relative to the first FPC segment 11 and the length direction of the FPC board 10 is 45°, that is, the first dotted line 14 and The angle formed by the length direction of the FPC board 10 is 45°. In this way, after the second FPC segment 12 is folded and bent from the side of the battery module body 2 and attached to the upper surface of the battery module body 2, the second The FPC segment 12 is parallel or perpendicular to the upper surface edge of the battery module body 2 to facilitate the installation of the second FPC segment 12 . Similarly, in FIG. 3 , the angle between the fold of the third FPC segment 13 when folded relative to the second FPC segment 12 and the length direction of the FPC board 10 is 45°, that is, the angle between the third dotted line 16 and the length direction of the FPC board 10 is 45°. The angle formed in the length direction is 45°. In this way, after the third FPC segment 13 is folded and bent from the upper surface of the battery module body 2 and attached to the front surface of the battery module body 2, the second FPC segment 12 It is parallel or perpendicular to the front surface edge of the battery module body 2 to facilitate the installation of the third FPC segment 13 .

In some embodiments of the present application, in Figure 3, the crease when the second FPC segment 12 is bent relative to the first FPC segment 11 (ie, the second dotted line 15), the third FPC segment 13 relative to the second FPC The creases (i.e., the fourth dotted line 17 ) when the segment 12 is bent are perpendicular to the length direction of the FPC board 10 to facilitate the fitting of the second FPC segment 12 to the upper surface of the battery module body 2 and the third FPC segment 13 Fitted with the front surface of the battery module body 2 .

In some embodiments of the present application, foam is provided at the folded position of the second FPC segment 12 relative to the first FPC segment 11 and the folded position of the third FPC segment 13 relative to the second FPC segment 12 . Specifically, foam is generally placed between two overlapping parts after folding to prevent the FPC from springing back after folding. For example, after the second FPC segment 12 is folded relative to the first FPC segment 11, the second FPC segment 12 at least partially overlaps with the first FPC segment 11. At this time, the overlapping portion of the second FPC segment 12 overlaps with the first FPC segment 12. Foam may be provided between the overlapping portions of segment 11 . For another example, after the third FPC segment 13 is folded relative to the second FPC segment 12, the third FPC segment 13 and the second FPC segment 12 at least partially overlap. At this time, the overlapping portion of the third FPC segment 13 overlaps the second FPC segment 12. Foam may be provided between overlapping portions of the FPC segments 12 . In one example, the length and width of the foam may both be 1 mm.

In some embodiments of the present application, as shown in Figure 5, Figure 5 is a detailed structural diagram of area B in Figure 1. In FIG. 5 , one end of the signal collection piece 20 is connected to the first FPC segment 11 , and the other end is connected to the bus 4 on the upper surface of the battery module body 2 . A battery is connected below the bus 4 so that the signal collection piece 20 Collect battery status signals. However, when the battery expands upward due to factors such as heating, the end of the signal collection piece 20 connected to the bus 4 will also move upward, which may easily cause the signal collection piece 20 to break and affect the collection of battery status signals.

To this end, this embodiment improves some structures in the first FPC segment 11. Specifically, as shown in FIG. 6 , FIG. 6 is a schematic plan view of part of the structure in the first FPC segment 11 of FIG. 5 . In FIG. 6 , the first FPC segment 11 is provided with a groove 18 on one side facing the upper surface of the battery module body 2 . The first FPC segment 11 includes an “S”-shaped connector 19 . The “S”-shaped connector 19 It is arranged in the groove 18, and there is a gap between the "S"-shaped connector 19 and the groove 18. The "S"-shaped connector 19 includes a first end 191 and a second end 192, and the first end 191 is fixed. On the first side wall 181 of the groove 18, the signal collection piece 20 is fixed to the second end 192. In this way, even if the battery expands upward, the "S"-shaped connector 19 can allow the signal collection piece 20 to move upward following the busbar 4. A certain distance avoids breakage of the signal collection piece 20 . Multiple structures shown in FIG. 6 may exist at the same time to connect different signal collection pieces 20 through different “S”-shaped connectors 19 .

In one example, the dimensions of the “S”-shaped connector 19 are illustrated. For example, FIG. 6 shows the distances of six positions: C, D, E, F, G, and H, where C can be 6 mm, D can be 4mm, E can be 10mm, F can be 2mm, G can be 8mm, H can be 7.2mm.

In some embodiments of the present application, the materials of the first FPC segment 11 are described. Referring to FIG. 7 , FIG. 7 is a schematic diagram of the stacked structure in a cross section of the first FPC segment 11 . In FIG. 7 , the first FPC segment 11 includes a first protective film layer 111 , an FPC substrate layer 112 , a covering film layer 113 and a second protective film layer 114 laminated in sequence. The first protective film layer 111 is located in the first FPC segment. 11 is close to the side of the battery module body 2 , and the second protective film layer 114 is located on the side of the first FPC segment 11 away from the battery module body 2 . One end of the signal collection sheet 20 is fixed between the FPC base material layer 112 and the cover film layer 113 at the second end 192 so that the signal collection sheet 20 is in contact with the FPC base material layer 112. In this way, the signal collection sheet 20 The collected battery status signal can be transmitted from the signal collection piece 20 to the FPC base material layer 112 to facilitate the transmission of the battery status signal in the FPC base material layer 112 .

Among them, the FPC base material layer 112 may specifically include a PI (Polyimide Film, polyimide film) reinforcement layer, a base material adhesive glue, and an FPC copper foil laminated in sequence. The PI reinforcement layer is disposed on the FPC base material layer 112 away from the covering layer. On one side of the film layer 113, the FPC copper foil is disposed on the side of the FPC base material layer 112 close to the covering film layer 113. The above-mentioned end of the signal collection piece 20 is specifically fixed between the FPC copper foil and the covering film layer 113. The signal collection The fixation of this end of the chip 20 can be achieved using solder paste and reflow soldering.

In one example, the thickness of the FPC substrate layer 112 may be 0.11 mm, where the thickness of the FPC copper foil is 35 microns, the thickness of the substrate adhesive is 25 microns, and the thickness of the PI reinforcement layer is 50 microns. The thickness of the first protective film layer 111 and the second protective film layer 114 is both 50 microns. The thickness of the adhesive between the film layer 113 and the FPC copper foil is 25 microns, and the total thickness of the first FPC segment 11 is 0.3±0.05 mm.

In the process of forming the first FPC segment 11 , after welding one end of the signal collection piece 20 to the FPC base material layer 112 and covering it with the covering film layer 113 , it is necessary to stick another layer on the covering film layer 113 at this time. However, due to the structural design of the “S”-shaped connector 19 mentioned above, the “S”-shaped connector 19 may shake, making the second protective film layer 114 unable to fit accurately.

To this end, this embodiment further improves some structures in the first FPC segment 11. Specifically, as shown in FIG. 6 , the second end 192 is connected to the second side wall 182 of the groove 18 through a micro-connection section 193 . The second side wall 182 is opposite to the first side wall 181 . In the micro-connection section 193 Under the constraint, the "S"-shaped connector 19 will not shake, so that the second protective film layer 114 can be accurately fitted, thereby increasing the yield and production efficiency of FPC. In one example, the width of the micro-connection section in a direction perpendicular to the upper surface of the battery module body 2 may be 1 mm, thereby realizing micro-connection.

In some embodiments of the present application, as shown in FIG. 6 , a positioning hole 183 is provided on the side of the groove 18 away from the “S”-shaped connector 19 , and the positioning hole 183 sequentially penetrates the first protective film layer 111 and the FPC substrate. layer 112, the covering film layer 113 and the second protective film layer 114, and the positioning hole 183 is used for the positioning post 3 on the battery module body to pass through. In this way, when the second protective film layer 114 is attached to the "S"-shaped connector 19, the positioning post 3 can also pass through the second protective film layer 114 through the positioning hole 183, so that the positioning post 3 can align the first protective film layer 114 with the second protective film layer 114. The simultaneous positioning of the layer 111 , the FPC base material layer 112 , the covering film layer 113 and the second protective film layer 114 further reduces the difficulty of accurately fitting the second protective film layer 114 .

In some embodiments of the present application, as shown in FIG. 8 , FIG. 8 is another detailed structural diagram of area B in FIG. 1 . In FIG. 8 , the signal collection piece 20 includes a first signal collection section 21 and a second signal collection section 22 . The first signal collection section 21 and the second signal collection section 22 are connected in sequence along the length direction of the signal collection piece 20 . The signal collecting section 21 and the second signal collecting section 22 are integrally formed. The first signal acquisition segment 21 is disposed on the side of the battery module body 2 where the first FPC segment 11 is located, and the end of the first signal acquisition segment 21 away from the second signal acquisition segment 22 is fixed to the second end 192 , and is connected to the second end 192 . The second signal collection section 22 is formed after the first signal collection section 21 is bent, so that the second signal collection section 22 is attached to the upper surface of the battery module body 2 and the second signal collection section 22 is away from the first signal collection section 21 The end is fixed to the bus bar 4 on the upper surface of the battery module body 2 . In this way, the signal collection piece 20 can collect the battery status signal from the bus bar 4 on the upper surface of the battery module body 2 and transmit it to the first FPC segment 11 on the side of the battery module body 2 .

In some embodiments of the present application, the separation distance between the crease 23 and the second end 192 when the second signal collection segment 22 is bent relative to the first signal collection segment 21 is greater than or equal to the preset distance, so that at the fold A certain space is left between the mark and the second end 192. In this way, when the second signal collection segment 22 is bent by the bending jig, the bending jig can utilize the space between the fold and the second end 192 to perform the bending operation without pressing the first signal collecting segment 22 . FPC segment 11 affects the collection of battery status signals. The value of the preset distance is set based on the space required by the bending fixture when performing the bending operation. For example, the value of the preset distance may be 2 mm.

In a second aspect, embodiments of the present application provide a battery module. The battery module includes a battery module body 2 and the FPC collection device 1 as described in any one of the above. The battery module main body 2 includes the above-mentioned battery, the bus bar 4 and the positioning post 3. The FPC acquisition device 1 is used to collect the battery status signal in the battery module main body 2, and realizes the external output of the battery on the front surface of the battery module main body 2. At the same time, the material cost of manufacturing the FPC board 10 is reduced.

The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and the core idea of the present application; at the same time, for Those skilled in the art may make changes in the specific implementation and application scope based on the ideas of the present application. In summary, the contents of this description should not be understood as limiting the present application.

Claims (10)

1. An FPC collection device, characterized in that the FPC collection device includes: The FPC board is in the shape of a long strip and includes a first FPC segment, a second FPC segment and a third FPC segment connected in sequence along the length direction of the FPC board. The first FPC segment, the second FPC segment and the The third FPC segment is integrally formed, the first FPC segment is attached to the first surface of the battery module body, and is folded and bent relative to the first FPC segment to form the second FPC segment. The second FPC segment is attached to the second surface of the battery module body, and is folded and bent relative to the second FPC segment to form the third FPC segment. The third FPC segment is attached to the The third surface of the battery module body, the first surface, the second surface and the third surface are mutually adjacent surfaces; A signal acquisition piece is arranged at the first FPC segment; A signal output interface is provided at the third FPC segment. 2. The FPC collection device according to claim 1, wherein the folding direction of the second FPC segment relative to the first FPC segment is inclined to the length direction of the FPC board, and the third FPC segment The folding direction relative to the second FPC segment is inclined to the length direction of the FPC board. 3. The FPC collection device according to claim 2, wherein the second FPC segment is sandwiched between the direction of the fold when the first FPC segment is folded and the length direction of the FPC board. The angle is 45°, and the angle formed by the direction of the crease when the third FPC segment is folded relative to the second FPC segment and the length direction of the FPC board is 45°. 4. The FPC collection device according to claim 1, wherein a groove is provided on one side of the first FPC segment toward the second surface, and the first FPC segment includes an “S”-shaped connection. The "S"-shaped connector is arranged in the groove. The "S"-shaped connector includes a first end and a second end. The first end is fixed to the groove. The first side wall, the signal collection piece is fixed on the second end. 5. The FPC collection device according to claim 4, wherein the cross section of the first FPC segment includes a first protective film layer, an FPC base material layer, a covering film layer and a second protective film layered in sequence. layer, the first protective film layer is located on the side of the first FPC segment close to the main body of the battery module, and one end of the signal collection piece is fixed to the FPC base at the second end. between the material layer and the covering film layer. 6. The FPC collection device according to claim 5, wherein the second end is connected to the second side wall of the groove through a micro-connection section, and the second side wall is connected to the first side wall. The side walls are arranged oppositely. 7. The FPC collection device according to claim 5, wherein a positioning hole is provided on the side of the groove away from the "S"-shaped connector, and the positioning hole penetrates the first protective film in turn. layer, the FPC base material layer, the covering film layer and the second protective film layer, and the positioning holes are used for the positioning posts on the battery module main body to pass through. 8. The FPC acquisition device according to claim 4, wherein the signal acquisition piece includes a first signal acquisition segment and a second signal acquisition segment, and the first signal acquisition segment and the second signal acquisition segment The signal collection pieces are connected in sequence along the length direction, the first signal collection segment is arranged on the first surface, and the end of the first signal collection segment away from the second signal collection segment is fixed on the The second end portion is bent relative to the first signal collection segment to form the second signal collection segment. The second signal collection segment is attached to the second surface. The second signal collection segment The end portion away from the first signal collection segment is fixed on the bus bar on the second surface. 9. The FPC acquisition device according to claim 8, wherein the distance between the crease of the second signal acquisition segment and the second end when the second signal acquisition segment is bent relative to the first signal acquisition segment is greater than Or equal to the preset distance. 10. A battery module, characterized in that the battery module includes a battery module body, and an FPC collection device as claimed in any one of claims 1 to 9, the FPC collection device being used to collect all Describes the battery status signal in the main body of the battery module.