Flexible circuit board assembly and battery device

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a flexible circuit board assembly and a battery device, branch lines of the flexible circuit board assembly are not easy to fall and deform, the connection firmness of the branch lines and a main body line is stronger, the branch lines can still be kept flat after being connected with sampling terminals, and when a battery cell is impacted and vibrated, the branch lines are not easy to fall and deform. And the branch lines can reliably protect the main body line. The flexible circuit board assembly comprises a main body circuit and a branch circuit, the main body circuit comprises a plurality of main body acquisition circuits, the branch circuit is electrically connected with at least one main body acquisition circuit, the branch circuit comprises at least one branch acquisition circuit and a sampling terminal, and the sampling terminal is electrically connected with the branch acquisition circuit. In the extension direction of the branch line, the first end of the branch line is electrically connected with the main body line through the first connecting part, the second end of the branch line is electrically connected with the main body line through the second connecting part, and the strength of the first connecting part is greater than that of the second connecting part.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and particularly relates to a flexible circuit board assembly and a battery device. Background Art

[0002] With the continuous development of new energy technologies, as an environmentally friendly energy storage and release device, new energy batteries have been widely used in energy storage power systems such as hydraulic power plants, thermal power plants, wind power plants, and solar power plants, as well as in many technical fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace.

[0003] FPC (Flexible Printed Circuit, abbreviated as FPC) is one of the important accessories of new energy batteries. Compared with traditional wire harnesses, FPC has obvious advantages in terms of safety, process flexibility, and automated production. The main circuit of the FPC is connected with branch circuits, the branch circuits are in a cantilever shape, and the sampling terminals are connected to the branch circuits. Due to the gravity of the sampling terminals, the branch circuits will sag and deform, causing the positions of the sampling terminals to deviate, resulting in difficulties in accurately welding the subsequent sampling terminals to the bus bar, and it is easy to produce problems such as false soldering, affecting the product quality. Summary of the Utility Model

[0004] In view of this, the utility model provides a flexible circuit board assembly and a battery device to solve the problem that the branch circuits of the existing flexible circuit board assembly are prone to sag and deformation, affecting the welding of the sampling terminals to the bus bar.

[0005] In a first aspect, the utility model provides a flexible circuit board assembly, comprising:

[0006] A main circuit, comprising a plurality of main acquisition circuits;

[0007] Branch circuits, electrically connected to at least one of the main acquisition circuits, the branch circuits comprising at least one branch acquisition circuit and sampling terminals, the sampling terminals being electrically connected to the branch acquisition circuits. In the extending direction of the branch circuits, the first end of the branch circuits is electrically connected to the main circuit through a first connection part, and the second end of the branch circuits is electrically connected to the main circuit through a second connection part, and the strength of the first connection part is greater than the strength of the second connection part.

[0008] Beneficial effects: The flexible circuit board assembly of the present utility model includes a main circuit and a branch circuit. In the extending direction of the branch circuit, the first end of the branch circuit is electrically connected to the main circuit through a first connection part, and the second end of the branch circuit is electrically connected to the main circuit through a second connection part. In addition to the connection between the first end of the branch circuit and the main circuit, the second end of the branch circuit is also separately connected to the main circuit through the second connection part, which can significantly enhance the connection strength between the branch circuit and the main circuit, making the branch circuit not easily affected by the gravity of the sampling terminal and not easily sag and deform. After the branch circuit is connected to the sampling terminal, it can still remain flat, facilitating the subsequent welding operation between the sampling terminal and the bus bar, reducing the welding difficulty, reducing the possibility of false soldering, improving the reliability of the structure, and improving the product quality.

[0009] Moreover, the strength of the first connection part is greater than that of the second connection part. When the battery cell is subjected to impact and vibration, compared with the first connection part, the second connection part is more likely to break, forming a cantilever structure for the branch circuit, that is, the second end of the branch circuit can be separated from the main circuit to prevent the main circuit from being torn and damaged, thereby forming a reliable protection for the main circuit.

[0010] In a second aspect, the present utility model further includes a battery device, which includes a box body, a battery pack, and the flexible circuit board assembly as described above. The battery pack is disposed in the box body, and the flexible circuit board assembly is disposed on the upper surface of the battery pack.

[0011] Since the battery device of the present utility model includes the flexible circuit board assembly of the present utility model and has the same beneficial effects as this flexible circuit board assembly, they will not be elaborated herein. Description of the Drawings

[0012] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 It is the front view of the flexible circuit board assembly of the present utility model;

[0014] Figure 2 It is Figure 1 the enlarged schematic view of part A in

[0015] Description of the reference numerals:

[0016] 1. Main circuit; 2. Branch circuit; 201. First end of the branch circuit; 202. Second end of the branch circuit; 203. Connection position; 3. Sampling terminal; 4. First connection part; 5. Second connection part; 6. Third connection part. Detailed implementation mode

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] The following combines Figures 1 to 2 , and describes the embodiments of the flexible circuit board assembly and the battery device of the present utility model.

[0019] According to an embodiment of the present utility model, on the one hand, a flexible circuit board assembly is provided, including: a main circuit 1 and a branch circuit 2. The main circuit 1 includes a plurality of main acquisition circuits. The branch circuit 2 is electrically connected to at least one main acquisition circuit. The branch circuit 2 includes at least one branch acquisition circuit and a sampling terminal 3. The sampling terminal 3 is electrically connected to the branch acquisition circuit. In the extending direction of the branch circuit 2, the first end 201 of the branch circuit is electrically connected to the main circuit 1 through a first connection part 4, and the second end 202 of the branch circuit is electrically connected to the main circuit 1 through a second connection part 5. The strength of the first connection part 4 is greater than that of the second connection part 5.

[0020] In this flexible circuit board assembly, in addition to the connection between the first end 201 of the branch circuit and the main circuit 1, the second end 202 of the branch circuit is also respectively connected to the main circuit 1 through the second connection part 5, which can significantly enhance the connection strength between the branch circuit 2 and the main circuit 1, making the branch circuit 2 not easily affected by the gravity of the sampling terminal 3 and not easily sag and deform. After the branch circuit 2 is connected to the sampling terminal 3, it can still remain flat, facilitating the subsequent welding operation of the sampling terminal 3 and the bus bar, reducing the welding difficulty, reducing the possibility of false soldering, improving the reliability of the structure, and improving the product quality.

[0021] Moreover, the strength of the first connection part 4 is greater than that of the second connection part 5. When the battery cell is subjected to impact and vibration, compared with the first connection part 4, the second connection part 5 is more likely to break, making the branch circuit 2 form a cantilever structure, that is, the second end 202 of the branch circuit can be separated from the main circuit 1 to prevent the main circuit 1 from being torn and damaged, thereby forming a reliable protection for the main circuit 1.

[0022] A flexible printed circuit board assembly, i.e., FPC, includes a main circuit 1 and branch circuits 2. Among them, the main circuit 1 is the main structure of the flexible printed circuit board assembly. The main circuit 1 includes multiple main acquisition circuits, and the main acquisition circuits are arranged inside the main circuit 1. The main acquisition circuits are used to transmit acquisition information. As Figure 2 shown, in Figure 2 this perspective, the extending direction of the main circuit 1 is the left-right direction, i.e., the direction indicated by the arrow x.

[0023] The branch circuits 2 are branch structures of the flexible printed circuit board assembly. The branch circuits 2 are electrically connected to at least one main acquisition circuit. For example, the branch circuits 2 can be electrically connected to one, two, three, etc. main acquisition circuits. The branch circuits 2 include at least one branch acquisition circuit and sampling terminals 3. The branch acquisition circuits are arranged inside the branch circuits 2. One, two, five, etc. branch acquisition circuits can be arranged inside the branch circuits 2. The branch acquisition circuits are used to transmit acquisition information. The sampling terminals 3 are electrically connected to the branch acquisition circuits, and the sampling terminals 3 are also electrically connected to the battery cells. The sampling terminals 3 are used to acquire information such as the temperature and voltage of the battery cells.

[0024] The function of the branch circuits 2 is that when the battery device is subjected to an external impact, the branch circuits 2 can break relative to the main circuit 1 to protect the main circuit 1 from breaking and being damaged. Usually, the second ends 202 of the branch circuits break relative to the main circuit 1. There are multiple branch circuits 2, and the multiple branch circuits 2 are arranged at intervals along the extending direction of the main circuit 1. The specific number of the branch circuits 2 is set according to the size of the main circuit 1 and the requirements of the battery circuit. The overall width of the branch circuits 2 is narrower than the overall width of the main circuit 1. As Figure 2 shown, in Figure 2 this perspective, the extending direction of the branch circuits 2 is the left-right direction, i.e., the direction indicated by the arrow x, that is, the extending direction of the branch circuits 2 is parallel to the extending direction of the main circuit 1.

[0025] In this embodiment, the side of the main circuit 1 has a notch, and the branch circuits 2 are arranged at the notch. And for the regularity of the overall structure of the flexible printed circuit board assembly, the outer sides (the sides away from the main circuit 1) of the branch circuits 2 are flush with the sides of the main circuit 1.

[0026] In this embodiment, the branch circuits 2 are in a strip-like structure. The branch circuits 2 have a first end 201 and a second end 202 of the branch circuits. In the extending direction of the branch circuits 2, the first end 201 and the second end 202 of the branch circuits are oppositely arranged. In Figure 2From this perspective, the first end 201 of the branch line is the left end of the branch line 2, and the second end 202 of the branch line is the right end of the branch line 2. Both the first end 201 and the second end 202 of the branch line are electrically connected to the main line 1. Since the first end 201 and the second end 202 of the branch line are oppositely arranged, the connection point between the first end 201 of the branch line and the main line 1 and the connection point between the second end 202 of the branch line and the main line 1 are also oppositely arranged.

[0027] Specifically, in the extending direction of the branch line 2, the first end 201 of the branch line is electrically connected to the main line 1 through the first connecting part 4, that is, one end of the first connecting part 4 is connected to the first end 201 of the branch line, and the other end of the first connecting part 4 is connected to the main line 1. As Figure 2 shown, the extending direction of the first connecting part 4 is the left - right direction, that is, the direction indicated by the arrow x. The extending direction of the first connecting part 4 is also the connecting direction between the first connecting part 4 and the branch line 2, which is named the first direction. In this embodiment, the first direction is the left - right direction.

[0028] In the extending direction of the branch line 2, the second end 202 of the branch line is electrically connected to the main line 1 through the second connecting part 5, that is, one end of the second connecting part 5 is connected to the second end 202 of the branch line, and the other end of the second connecting part 5 is connected to the main line 1. As Figure 2 shown, the extending direction of the second connecting part 5 is the left - right direction, that is, the direction indicated by the arrow x. The extending direction of the second connecting part 5 is also the connecting direction between the second connecting part 5 and the branch line 2, that is, the first direction, and the first direction is parallel to the extending direction of the branch line 2.

[0029] Optionally, the connection point between the second connecting part 5 and the second end 202 of the branch line should be as close as possible to the middle position of the second end 202 of the branch line to improve the connection strength between the second connecting part 5 and the second end 202 of the branch line.

[0030] The width of the first connecting part 4 is less than the width of the first end 201 of the branch line, the width of the second connecting part 5 is less than the width of the second end 202 of the branch line, and the width of the first connecting part 4 is greater than the width of the second connecting part 5. The strength of the first connecting part 4 is greater than the strength of the second connecting part 5. The first end 201 of the branch line is the main connection position between the branch line 2 and the main line 1. Therefore, the width of the first connecting part 4 is set wider to ensure the connection strength between the first end 201 of the branch line and the main line 1. When the battery cell is subjected to impact and vibration, compared with the first connecting part 4, the second connecting part 5 is more likely to break, making the branch line 2 form a cantilever structure, that is, the second end 202 of the branch line can be separated from the main line 1 to prevent the main line 1 from being torn and damaged, thereby forming a reliable protection for the main line 1.

[0031] In this embodiment, the second connecting portion 5 is a connecting rib.

[0032] Of course, the flexible circuit board assembly further includes other structural components, such as output terminals, etc. The flexible circuit board assembly can be electrically connected to the battery management assembly (such as a connector) through the output terminal to achieve the transmission of electrical signals, which will not be elaborated here.

[0033] Further, the width of the second connecting portion 5 is a, and the width of the first connecting portion 4 is c. The ratio range of c:a is 2 - 8.

[0034] As Figure 2 shown, the width of the second connecting portion 5 is a, and the width of the first connecting portion 4 is c. The width of the first connecting portion 4 is greater than the width of the second connecting portion 5 to ensure the connection strength between the first end 201 of the branch line and the main line 1.

[0035] If the ratio of c:a is too small, the width of the first connecting portion 4 is close to the width of the second connecting portion 5, and the connection strength between the first end 201 of the branch line and the main line 1 cannot be ensured, or when subjected to external impact, the second connecting portion 5 is not easily broken; while if the ratio of c:a is too large, the difference between the width of the first connecting portion 4 and the width of the second connecting portion 5 is large, and the connection strength between the branch line 2 and the main line 1 cannot be guaranteed, making the branch line 2 easily deformed downward under the influence of the gravity of the sampling terminal 3.

[0036] When the ratio of c:a is within the above range, the widths of both the first connecting portion 4 and the second connecting portion 5 are relatively appropriate. It can not only ensure the connection strength and prevent the branch line 2 from being deformed downward, but also when subjected to external impact, the second connecting portion 5 can be smoothly broken to effectively protect the main line 1.

[0037] For example, the ratio of c:a can be 2, 2.3, 3, 4.5, 6, 8, etc.

[0038] Further, the width range of the first connecting portion 4 is 4mm - 8mm, and the width range of the second connecting portion 5 is 1mm - 2mm.

[0039] If the width of the first connecting portion 4 is too small, the connection strength between the branch line 2 and the main line 1 cannot be guaranteed, while if the width of the first connecting portion 4 is too large, it will occupy a large installation space, which is not conducive to the structural layout.

[0040] In this embodiment, the width of the first connecting portion 4 is in the range of 4mm - 8mm. Within the above range, the width of the first connecting portion 4 is relatively appropriate, neither too large nor too small. It can ensure the connection strength between the branch line 2 and the main line 1, and has a small volume, will not occupy a large installation space, and is conducive to the structural layout.

[0041] For example, the width of the first connecting portion 4 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc.

[0042] If the width of the second connecting portion 5 is too small, the connection strength between the branch line 2 and the main line 1 cannot be guaranteed. If the width of the second connecting portion 5 is too large, when subjected to an external force impact, the second connecting portion 5 is not easily broken, and the branch line 2 cannot effectively protect the main line 1, increasing the risk of the main line 1 of the flexible circuit board assembly being torn.

[0043] In this embodiment, the width range of the second connecting portion 5 is 1 mm - 2 mm. Within the above range, the width of the second connecting portion 5 is relatively appropriate, neither too large nor too small, which can guarantee the connection strength between the branch line 2 and the main line 1, effectively fix the branch line 2, and when subjected to an external force impact, the second connecting portion 5 can deform or tear, so that the branch line 2 can effectively protect the main line 1, thereby reducing the risk of the main line 1 being torn and improving safety.

[0044] For example, the width of the second connecting portion 5 can be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, etc.

[0045] Optionally, the width range of the second connecting portion 5 is 1 mm - 1.5 mm. For example, 1 mm, 1.2 mm, 1.35 mm, 1.5 mm.

[0046] Furthermore, the setting position of the sampling terminal 3 is closer to the second end 202 of the branch line than the first end 201 of the branch line.

[0047] The sampling terminal 3 can be electrically connected to the battery cell to collect information such as the temperature and voltage of the battery cell. The sampling terminal 3 is made of a metal material, such as nickel, so the sampling terminal 3 has a certain weight. The sampling terminal 3 is integrally in a thin sheet structure, and the sampling terminal 3 is connected to the branch line 2, usually by welding.

[0048] As Figure 2 shown, the setting position of the sampling terminal 3 is closer to the second end 202 of the branch line than the first end 201 of the branch line. Therefore, compared with the first end 201 of the branch line, the second end 202 of the branch line requires stronger connection strength to ensure that the branch line 2 is not easily deformed by the gravity of the sampling terminal 3 and sag.

[0049] Furthermore, the branch line 2 is also connected to the main line 1 through a third connecting portion 6. The connection position 203 between the branch line 2 and the third connecting portion 6 is located between the first end 201 and the second end 202 of the branch line and is closer to the second end 202.

[0050] The branch line 2 is also connected to the main line 1 through the third connecting portion 6. That is, one end of the third connecting portion 6 is connected to the branch line 2, and the other end of the third connecting portion 6 is connected to the main line 1. As Figure 2 shown, the extending direction of the third connecting portion 6 is the up-and-down direction, that is, the direction indicated by the arrow y. The extending direction of the third connecting portion 6 is also the connecting direction between the third connecting portion 6 and the branch line 2, which is named the second direction. In this embodiment, the second direction is the up-and-down direction.

[0051] In this embodiment, the third connecting portion 6 is a connecting rib. And, the first direction is perpendicular to the second direction.

[0052] The position where the branch line 2 is connected to the third connecting portion 6 is the connection position 203. The connection position 203 is located between the first end 201 and the second end 202 of the branch line. That is to say, in the area between the first end 201 and the second end 202 of the branch line, the branch line 2 is also connected to the main line 1, so that the connection positions of the whole branch line 2 and the main line 1 are evenly arranged, which is more conducive to improving the connection strength between the branch line 2 and the main line 1 and making the branch line 2 better fixed.

[0053] The connection position 203 between the branch line 2 and the third connecting portion 6 is closer to the second end 202 of the branch line and farther from the first end 201 of the branch line. That is, the distance between the connection position 203 and the second end 202 of the branch line is closer than the distance between the connection position 203 and the first end 201 of the branch line. Affected by the setting position of the subsequent sampling terminal 3, compared with the first end 201 of the branch line, the second end 202 of the branch line needs to enhance the connection strength and firmness more. And for the above setting, the connection between the branch line 2 and the main line 1 through the third connecting portion 6 has a better effect on enhancing the connection strength of the second end 202 of the branch line, making the second end 202 of the branch line not easy to sag and deform.

[0054] The connection position 203 is arranged on the side of the branch line 2 facing the main line 1. As Figure 2 shown, specifically, the connection position 203 between the branch line 2 and the third connecting portion 6 is arranged on the side of the branch line 2 facing the main line 1. The branch line 2 has two sides. One side facing the main line 1 is the inner side, and the other side away from the main line 1 is the outer side plate. The inner side and the outer side are arranged oppositely.

[0055] The inner side of the branch line 2 faces the main line 1, and there is a spaced arrangement between the inner side of the branch line 2 and the main line 1. The connection position 203 is set on the inner side, which is the position on the branch line 2 closest to the main line 1 between the first end 201 and the second end 202 of the branch line, facilitating the setting of the third connection part 6, and enabling the structure of the flexible circuit board assembly to be more compact and rationally utilize the setting space.

[0056] Furthermore, the extension line of the connection direction between the third connection part 6 and the branch line 2 passes through the sampling terminal 3.

[0057] The connection direction between the third connection part 6 and the branch line 2, that is, the second direction, in Figure 2 it, the second direction is set along the up and down direction, and the extension line of the second direction passes through the sampling terminal 3. That is to say, the sampling terminal 3 has a certain width, and the distance between its left and right sides is its width. Between the first end 201 and the second end 202 of the branch line, the connection position 203 is within the area formed by extending a certain distance upward from the left and right sides of the sampling terminal 3.

[0058] Since the sampling terminal 3 has a certain weight, after the sampling terminal 3 is set on the branch line 2, under the action of the gravity of the sampling terminal 3, the branch line 2 is prone to sag and deform. Therefore, at the position where the sampling terminal 3 is set on the branch line 2, it is more necessary to strengthen the connection strength and firmness. Therefore, the connection position 203 is set at this area position.

[0059] Furthermore, the width range of the third connection part 6 is 1mm - 2mm.

[0060] If the width of the third connection part 6 is too small, the connection strength between the branch line 2 and the main line 1 cannot be guaranteed. If the width of the third connection part 6 is too large, when subjected to an external impact, the third connection part 6 is not easily broken, and the branch line 2 cannot effectively protect the main line 1, increasing the risk of the main line 1 of the flexible circuit board assembly being torn.

[0061] In this embodiment, the width range of the third connection part 6 is 1mm - 2mm. Within the above range, the width of the third connection part 6 is more appropriate, neither too large nor too small, which can guarantee the connection strength between the branch line 2 and the main line 1, effectively fix the branch line 2, and when subjected to an external impact, the third connection part 6 can deform or tear, so that the branch line 2 can effectively protect the main line 1, thereby reducing the risk of the main line 1 being torn and improving safety.

[0062] For example, the width of the third connection part 6 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc.

[0063] Optionally, the width range of the third connecting portion 6 is 1 mm - 1.5 mm, for example, 1 mm, 1.2 mm, 1.35 mm, 1.5 mm.

[0064] Furthermore, the connection direction of the third connecting portion 6 and the branch line 2 intersects with the extending direction of the branch line 2.

[0065] The connection direction of the third connecting portion 6 and the branch line 2 is different from the connection directions of the first connecting portion 4 and the second connecting portion 5 with the branch line 2, that is, the first direction and the second direction are different directions. The connection directions of the first connecting portion 4 and the second connecting portion 5 with the branch line 2 are parallel to the extending direction of the branch line 2, that is, the first direction is parallel to the extending direction of the branch line 2. The first direction and the second direction are not parallel but intersect. Specifically, the extension line of the first direction intersects with the extension line of the second direction, so that the branch line 2 is connected to the main line 1 in two directions, with stronger connection firmness, realizing more effective fixation of the branch line 2, further reducing the possibility of the branch line 2 sagging and deforming, enabling the sampling terminal 3 to be conveniently welded to the bus bar, and thus ensuring the welding quality.

[0066] Furthermore, the width of the second connecting portion 5 is the same as the width of the third connecting portion 6.

[0067] To simplify the process steps and difficulty, the width of the second connecting portion 5 is set to be the same as the width of the third connecting portion 6. For example, the widths of both the second connecting portion 5 and the third connecting portion 6 are 1.4 mm.

[0068] This embodiment also provides a battery device, including a box body, a battery pack, and the flexible circuit board assembly as described above. The battery pack is arranged inside the box body, and the flexible circuit board assembly is arranged on the upper surface of the battery pack.

[0069] The box body is a support structure of the battery device, which has an accommodation space inside. The battery pack is suitable for being arranged in this accommodation space, and the flexible circuit board assembly is arranged on the upper surface of the battery pack to facilitate the electrical connection between the flexible circuit board assembly and the battery pack, and to conveniently collect information such as the temperature and voltage of the battery pack by the flexible circuit board assembly.

[0070] Of course, the battery device of this embodiment also has other structures and components that existing battery devices all have, which will not be elaborated here.

[0071] This kind of battery device has the flexible circuit component of this embodiment. The branch line 2 is not easily affected by the gravity of the sampling terminal 3 and is not easily sagging and deforming, so that the branch line 2 can still remain flat after connecting the sampling terminal 3, facilitating the subsequent welding operation between the sampling terminal 3 and the bus bar, reducing the welding difficulty, reducing the possibility of false soldering, improving the reliability of the structure, and improving the product quality. Moreover, when the battery cell is subjected to impact and vibration, the branch line 2 can form a reliable protection for the main line.

[0072] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A flexible circuit board assembly, characterized in that, Comprising: A main circuit (1), including a plurality of main acquisition circuits; A branch circuit (2), electrically connected to at least one of the main acquisition circuits. The branch circuit (2) includes at least one branch acquisition circuit and a sampling terminal (3), and the sampling terminal (3) is electrically connected to the branch acquisition circuit. In the extending direction of the branch circuit (2), the first end (201) of the branch circuit is electrically connected to the main circuit (1) through a first connection part (4), and the second end (202) of the branch circuit is electrically connected to the main circuit (1) through a second connection part (5). The strength of the first connection part (4) is greater than that of the second connection part (5).

2. The flexible circuit board assembly according to claim 1, wherein The width of the second connection part (5) is a, and the width of the first connection part (4) is c. The ratio range of c:a is 2 - 8.

3. The flexible circuit board assembly according to claim 1, wherein, The width range of the first connection part (4) is 4mm - 8mm, and the width range of the second connection part (5) is 1mm - 2mm.

4. The flexible circuit board assembly according to claim 1, characterized in that, The setting position of the sampling terminal (3) is closer to the second end (202) of the branch circuit than the first end (201) of the branch circuit.

5. The flexible circuit board assembly according to any one of claims 1-4, characterized in that The branch circuit (2) is further connected to the main circuit (1) through a third connection part (6). The connection position (203) of the branch circuit (2) and the third connection part (6) is located between the first end (201) and the second end (202) of the branch circuit and is closer to the second end (202) of the branch circuit.

6. The flexible circuit board assembly according to claim 5, wherein The extension line of the connection direction between the third connection part (6) and the branch circuit (2) passes through the sampling terminal (3).

7. The flexible circuit board assembly according to claim 5, wherein, The width range of the third connection part (6) is 1mm - 2mm.

8. The flexible circuit board assembly according to claim 5, wherein, The connection direction between the third connection part (6) and the branch circuit (2) intersects with the extending direction of the branch circuit (2).

9. The flexible circuit board assembly according to claim 5, wherein The width of the second connection part (5) is the same as that of the third connection part (6).

10. A battery device, characterized in that, Comprising a box body, a battery pack, and a flexible circuit board assembly as described in any one of claims 1 - 9. The battery pack is arranged inside the box body, and the flexible circuit board assembly is arranged on the upper surface of the battery pack.

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