Flexible circuit board and maintenance method thereof, integrated busbar, battery pack and vehicle

Abstract

The invention discloses a flexible circuit board and a maintenance method thereof, an integrated busbar, a battery pack and a vehicle, the flexible circuit board comprises a conductive layer, a first covering film and a second covering film, the conductive layer comprises a line, a first fuse and a second fuse, the first fuse is electrically connected with the line, and the second fuse is electrically connected with the first covering film. A gap is formed between the second fuse and the circuit; the first covering film and the second covering film are arranged on the two sides of the conducting layer in the thickness direction respectively and connected with the conducting layer, and the first covering film is provided with a first window, a second window, a third window and a fourth window; wherein the first window and the second window are respectively arranged corresponding to bonding pads at two ends of the first fuse, and the third window and the fourth window are respectively arranged corresponding to bonding pads at two ends of the second fuse. According to the flexible circuit board, the fuse can be maintained, so that the flexible circuit board is prevented from being scrapped due to fusing of the fuse.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and particularly relates to a flexible circuit board and its repair method, an integrated busbar, a battery pack, and a vehicle. Background Art

[0002] Power batteries are the core components of electric vehicles and the energy source of the entire vehicle. As the basic unit for charging and discharging power batteries, battery cells determine the cruising range of the vehicle, and their importance is self-evident. During the use of power batteries, it is necessary to ensure that the voltage of each battery cell is at the same level to avoid overcharging or over-discharging of a single battery cell. However, due to reasons such as materials, environment, and manufacturing processes, there are differences between battery cells. Therefore, during the use of battery cells, it is necessary to collect the voltage and temperature of the battery cells in real time to detect the status of the battery cells. The signals collected are transmitted to the battery management system through a sampling wire harness for monitoring and diagnosing whether the battery cells are abnormal. The reliability of the sampling wire harness will directly affect the performance of the battery cells and determine the service life of the battery cells, which is of great significance.

[0003] In power batteries, multiple battery cells are often connected in series through a busbar to obtain a larger battery capacity to meet the performance requirements of the entire vehicle. At the same time, an FPC (Flexible Printed Circuit) is arranged beside the busbar. The FPC is connected to the busbar through a nickel sheet to realize the voltage acquisition of the battery cells. The FPC is connected to the BMS (Battery Management System) through a wire harness to realize signal transmission. Inside the FPC, a fuse is arranged on each voltage acquisition loop. When a short circuit or abnormal current occurs in the battery cell, the fuse can quickly blow when the current is greater than a preset value to protect the battery cell and prevent thermal runaway and thermal spread.

[0004] Currently, the FPC includes a conductive layer, a first cover film, and a second cover film, and the conductive layer is arranged between the first cover film and the second cover film. Among them, the fuse is arranged on the conductive layer. When the fuse blows, since the first cover film and the second cover film respectively block both sides of the fuse, it is impossible to repair the fuse, resulting in the scrapping of the FPC. Moreover, since the FPC and the busbar are mostly connected by welding, it is very difficult to separate the FPC from the busbar, resulting in the inability to remove the entire FPC and replace it with a new one. This leads to the scrapping of the entire battery pack with the FPC after the fuse of the FPC blows, increasing the repair cost of the vehicle with the battery pack. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, the present invention provides a flexible circuit board to enable replacement of the fuse of the flexible circuit board.

[0007] The flexible circuit board of the present invention includes a conductive layer, a first cover film, and a second cover film. The conductive layer includes a circuit, a first fuse, and a second fuse. The first fuse is electrically connected to the circuit, and there is a gap between the second fuse and the circuit. The first cover film and the second cover film are respectively disposed on both sides of the conductive layer in the thickness direction and are connected to the conductive layer. The first cover film is provided with a first window, a second window, a third window, and a fourth window. Among them, the first window and the second window are respectively disposed corresponding to the pads at both ends of the first fuse, and the third window and the fourth window are respectively disposed corresponding to the pads at both ends of the second fuse.

[0008] Optionally, the pads at both ends of the first fuse are respectively a first pad and a second pad. The first window is disposed corresponding to the first pad, and the second window is disposed corresponding to the second pad. The projection of the first pad on the first cover film is located within the first window, and the projection of the second pad on the first cover film is located within the second window; and / or, the pads at both ends of the second fuse are respectively a third pad and a fourth pad. The third window is disposed corresponding to the third pad, and the fourth window is disposed corresponding to the fourth pad. The projection of the third pad on the first cover film is located within the third window, and the projection of the fourth pad on the first cover film is located within the fourth window.

[0009] Optionally, the conductive layer includes a circuit area and a non-circuit area. The circuit and the first fuse are both disposed in the circuit area, and the second fuse is disposed in the non-circuit area.

[0010] Optionally, the non-circuit area is provided with multiple pieces of reinforcing metal. The second fuse is disposed between the multiple pieces of reinforcing metal, and there is a gap between the second fuse and the reinforcing metal.

[0011] Optionally, the number of the circuit, the first fuse, and the second fuse is multiple. There is a gap between adjacent two first fuses, and there is a gap between adjacent two second fuses; adjacent two first fuses are connected in series to the same circuit, and / or, adjacent two first fuses are respectively electrically connected to two circuits.

[0012] Optionally, the flexible circuit board further includes a first insulating layer and a second insulating layer. The first insulating layer and the second insulating layer are separably connected to the first cover film. The first insulating layer seals the first window, and the second insulating layer seals the second window; and / or, the flexible circuit board further includes a third insulating layer and a fourth insulating layer. The third insulating layer and the fourth insulating layer are separably connected to the first cover film. The third insulating layer seals the third window, and the fourth insulating layer seals the fourth window.

[0013] The present invention also provides a repair method for the flexible circuit board described in any one of the above.

[0014] The repair method for the flexible circuit board of the present invention includes the following steps: determining whether the first fuse is blown;

[0015] When the first fuse is blown, the pads at both ends of the first fuse are electrically connected to the pads at both ends of the second fuse by using a wire, so that the second fuse is electrically connected to the circuit.

[0016] The present invention also provides an integrated busbar.

[0017] The integrated busbar of the present invention includes a bracket, a plurality of busbars, and a flexible circuit board. The busbars are connected to the bracket;

[0018] A flexible circuit board, which is the flexible circuit board described in any one of the above, and the circuit is electrically connected to the busbar.

[0019] The present invention also provides a battery pack.

[0020] The battery pack of the present invention includes a plurality of battery cells and an integrated busbar. The integrated busbar is the integrated busbar described in any one of the above, and the busbar is electrically connected to the battery cells.

[0021] The present invention also provides a vehicle.

[0022] The vehicle of the present invention includes the battery pack described in any one of the above.

[0023] For the flexible circuit board of the present invention, by disposing a first cover film and a second cover film on both sides of the conductive layer in the thickness direction, the first cover film and the second cover film can play an insulating and protective role for the conductive layer. By providing a first fuse electrically connected to the circuit, the first fuse can quickly blow when the current in the circuit is greater than a preset value. By providing a second fuse spaced from the circuit, the second fuse is insulated from the circuit. By providing a first window, a second window, a third window, and a fourth window on the first cover film, and the first window and the second window are respectively provided corresponding to the pads at both ends of the first fuse, and the third window and the fourth window are respectively provided corresponding to the pads at both ends of the second fuse, the pads at both ends of the first fuse can be exposed through the first window and the second window respectively, and the pads at both ends of the second fuse can be exposed through the third window and the fourth window respectively. Thus, when the first fuse blows, the pads at both ends of the first fuse can be electrically connected to the pads at both ends of the second fuse by using a wire, so that the second fuse is electrically connected to the circuit, and the blown first fuse is replaced with the second fuse. That is, the repair of the fuse of the flexible circuit board is realized, thereby avoiding the flexible circuit board from being scrapped due to the blowing of the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a flexible circuit board according to an embodiment of the present invention.

[0025] Figure 2 is a partial structural schematic diagram of the conductive layer of a flexible circuit board according to an embodiment of the present invention.

[0026] Figure 3 is Figure 2 a partial enlarged view of

[0027] Figure 4 is a partial structural schematic diagram of the first cover film of a flexible circuit board according to an embodiment of the present invention.

[0028] REFERENCE SIGNS:

[0029] 1, conductive layer; 11, circuit area; 111, circuit; 112, first fuse; 1121, first fuse body; 1122, first pad; 1123, second pad; 1124, first transition portion; 1125, second transition portion; 12, non-circuit area; 121, second fuse; 1211, second fuse body; 1212, third pad; 1213, fourth pad; 1214, third transition portion; 1215, fourth transition portion; 122, reinforcing metal;

[0030] 2, first cover film; 21, first window; 22, second window; 23, third window; 24, fourth window;

[0031] 3. The second cover film. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0033] As Figures 1 to 4 shown, the flexible circuit board of the embodiment of the present invention includes a conductive layer 1, a first cover film 2 and a second cover film 3. The conductive layer 1 includes a circuit 111, a first fuse 112 and a second fuse 121. The first fuse 112 is electrically connected to the circuit 111, and there is a gap between the second fuse 121 and the circuit 111. The first cover film 2 and the second cover film 3 are respectively disposed on both sides of the conductive layer 1 in the thickness direction and are connected to the conductive layer 1. The first cover film 2 is provided with a first window 21, a second window 22, a third window 23 and a fourth window 24. Among them, the first window 21 and the second window 22 are respectively arranged corresponding to the pads at both ends of the first fuse 112, and the third window 23 and the fourth window 24 are respectively arranged corresponding to the pads at both ends of the second fuse 121. Among them, the conductive layer 1 can be a copper foil layer; the first cover film 2 and the second cover film 3 can be PI (Polyimide) layers.

[0034] For the flexible circuit board of the embodiment of the present invention, by respectively disposing the first cover film 2 and the second cover film 3 on both sides of the conductive layer 1 in the thickness direction, the first cover film 2 and the second cover film 3 can play an insulating and protective role for the conductive layer 1. By providing the first fuse 112 electrically connected to the circuit 111, the first fuse 112 can quickly blow when the current in the circuit 111 is greater than a preset value. By providing the second fuse 121 arranged at an interval from the circuit 111, the second fuse 121 is insulated from the circuit 111. By providing the first window 21, the second window 22, the third window 23 and the fourth window 24 on the first cover film 2, and the first window 21 and the second window 22 are respectively arranged corresponding to the pads at both ends of the first fuse 112, and the third window 23 and the fourth window 24 are respectively arranged corresponding to the pads at both ends of the second fuse 121, the pads at both ends of the first fuse 112 can be respectively exposed through the first window 21 and the second window 22, and the pads at both ends of the second fuse 121 can be respectively exposed through the third window 23 and the fourth window 24. Thus, when the first fuse 112 blows, the pads at both ends of the first fuse 112 can be respectively electrically connected to the pads at both ends of the second fuse 121 by using a wire, so that the second fuse 121 is electrically connected to the circuit 111, so as to replace the blown first fuse 112 with the second fuse 121. That is, the repair of the fuse of the flexible circuit board is realized, thereby avoiding the flexible circuit board from being scrapped due to the fuse blowing.

[0035] Actually, the first fuse 112 is the in-use fuse, and the second fuse 121 is the spare fuse. After the in-use fuse melts, it is replaced with the spare fuse to ensure the normal use of the conductive layer 1. Among them, the overcurrent capacity of the second fuse 121 is the same as that of the first fuse 112. That is, both the second fuse 121 and the first fuse 112 melt when the current in the circuit 111 is greater than the preset value.

[0036] As Figure 2 and Figure 3 shown, the first fuse 112 includes a first fuse body 1121, and a first pad 1122 and a second pad 1123 are respectively connected to both ends of the first fuse body 1121. The second fuse 121 includes a second fuse body 1211, and a third pad 1212 and a fourth pad 1213 are respectively connected to both ends of the second fuse body 1211. Among them, the first pad 1122, the second pad 1123, the third pad 1212, and the fourth pad 1213 can be rectangular, circular, diamond-shaped, etc.

[0037] Optionally, as Figure 2 and Figure 3 shown, the conductive layer 1 includes a circuit area 11 and a non-circuit area 12. The circuit 111 and the first fuse 112 are arranged in the circuit area 11, and the second fuse 121 is arranged in the non-circuit area 12.

[0038] It can be understood that in the prior art, both the circuit 111 and the first fuse 112 are arranged in the circuit area 11 of the conductive layer 1. If the second fuse 121 is arranged in the circuit area 11, it will affect the original layout of the circuit area 11 and is not conducive to the layout and manufacturing of the circuit 111 and the first fuse 112 in the circuit area 11.

[0039] By arranging the second fuse 121 in the non-circuit area 12, it is possible to avoid the second fuse 121 affecting the design layout of the circuit 111 and the first fuse 112, thereby facilitating the layout and manufacturing of the conductive layer 1.

[0040] Optionally, as Figure 2 and Figure 3 shown, the non-circuit area 12 is provided with multiple reinforcing metals 122. The second fuse 121 is arranged between the multiple reinforcing metals 122, and there is a gap between the second fuse 121 and the reinforcing metals 122. Among them, the reinforcing metals 122 can be triangular, rectangular, diamond-shaped, etc.

[0041] It can be understood that the reinforcing metal 122 serves to enhance the overall strength of the flexible circuit board, and the second fuse 121 is also made of a metal material, which can also play a role in enhancing the overall strength of the flexible circuit board. By arranging the second fuse 121 between multiple reinforcing metals 122, the second fuse 121 can replace the reinforcing metal 122 and play a role in enhancing the overall strength of the flexible circuit board. Thus, while ensuring the overall strength of the flexible circuit board, the size of the non-circuit area 12 can be not increased, and the cost of the flexible circuit board can be saved.

[0042] Optionally, as Figure 2 and Figure 3 shown, the numbers of the circuit 111, the first fuse 112, and the second fuse 121 are all multiple, there is a gap between two adjacent first fuses 112, and there is a gap between two adjacent second fuses 121. Two adjacent first fuses 112 are connected in series with the same circuit 111, and / or two adjacent first fuses 112 are electrically connected to two circuits 111 respectively. That is to say, two adjacent first fuses 112 can be connected in series with the same circuit 111, or can be electrically connected to two circuits 111 respectively.

[0043] Among them, the setting area of the second fuse 121 can be relatively flexible. It can be centrally arranged in a certain area, or different numbers of second fuses 121 can be selectively arranged in multiple areas, as long as the overcurrent of the circuit 111 is not affected.

[0044] By arranging multiple second fuses 121, the number of fuses available for replacement is relatively large, and multiple first fuses 112 can be repaired and the same first fuse 112 can be repaired multiple times, reducing the scrapping risk of the flexible circuit board.

[0045] Optionally, as Figure 2 and Figure 3 shown, the second fuse 121 extends along the length direction of the flexible circuit board.

[0046] For example, as Figure 2 and Figure 3 shown, the length direction of the flexible circuit board is consistent with the left - right direction, and the second fuse 121 extends along the left - right direction.

[0047] It can be understood that the length of the flexible circuit board is greater than the width, and the length of the second fuse 121 is greater than the width. By arranging the second fuse 121 to extend along the length direction of the flexible circuit board, the extension direction of the second fuse 121 is consistent with the length direction of the flexible circuit board, which is convenient for arranging the second fuse 121 in the conductive layer 1.

[0048] Optionally, as Figure 3As shown, the first fuse 112 further includes a first transition portion 1124 and a second transition portion 1125. The first transition portion 1124 is disposed between the first fuse body 1121 and the first pad 1122, and one end of the first fuse body 1121 is electrically connected to the first pad 1122 through the first transition portion 1124; the second transition portion 1125 is disposed between the first fuse body 1121 and the second pad 1123, and the other end of the first fuse body 1121 is electrically connected to the second pad 1123 through the second transition portion 1125. Wherein, the width of the first transition portion 1124 is greater than that of the first fuse body 1121 and less than that of the first pad 1122; the width of the second transition portion 1125 is greater than that of the first fuse body 1121 and less than that of the second pad 1123.

[0049] By providing the first transition portion 1124 and the second transition portion 1125, it is convenient for the first fuse body 1121 to be transitionally connected to the first pad 1122 and the second pad 1123.

[0050] Optionally, as Figure 3 shown, the second fuse 121 further includes a third transition portion 1214 and a fourth transition portion 1215. The third transition portion 1214 is disposed between the second fuse body 1211 and the third pad 1212, and one end of the second fuse body 1211 is electrically connected to the third pad 1212 through the third transition portion 1214; the fourth transition portion 1215 is disposed between the second fuse body 1211 and the fourth pad 1213, and the other end of the second fuse body 1211 is electrically connected to the fourth pad 1213 through the fourth transition portion 1215. Wherein, the width of the third transition portion 1214 is greater than that of the second fuse body 1211 and less than that of the third pad 1212; the width of the fourth transition portion 1215 is greater than that of the second fuse body 1211 and less than that of the fourth pad 1213.

[0051] By providing the third transition portion 1214 and the fourth transition portion 1215, it is convenient for the second fuse body 1211 to be transitionally connected to the third pad 1212 and the fourth pad 1213.

[0052] Optionally, the projection of the first pad 1122 on the first cover film 2 is located within the first window 21. In other words, the projection of the first pad 1122 in the thickness direction of the flexible circuit board is located within the projection of the first window 21 in the thickness direction of the flexible circuit board.

[0053] Thereby, the entire first pad 1122 is exposed within the first window 21, which not only facilitates the soldering of the wire to the first pad 1122 and further improves the repair efficiency of the fuse of the flexible circuit board; but also helps to increase the connection area between the wire and the first pad 1122 and improve the connection reliability between the wire and the first pad 1122.

[0054] Optionally, the projection of the second pad 1123 on the first cover film 2 is located within the second window 22. In other words, the projection of the second pad 1123 in the thickness direction of the flexible circuit board is located within the projection of the second window 22 in the thickness direction of the flexible circuit board.

[0055] Thereby, the whole of the second pad 1123 is exposed within the second window 22, which not only facilitates the soldering of the wire to the second pad 1123 and further improves the fuse repair efficiency of the flexible circuit board, but also helps to increase the connection area between the wire and the second pad 1123 and improve the connection reliability between the wire and the second pad 1123.

[0056] Optionally, the projection of the third pad 1212 on the first cover film 2 is located within the third window 23. In other words, the projection of the third pad 1212 in the thickness direction of the flexible circuit board is located within the projection of the third window 23 in the thickness direction of the flexible circuit board.

[0057] Thereby, the whole of the third pad 1212 is exposed within the third window 23, which not only facilitates the soldering of the wire to the third pad 1212 and further improves the fuse repair efficiency of the flexible circuit board, but also helps to increase the connection area between the wire and the third pad 1212 and improve the connection reliability between the wire and the third pad 1212.

[0058] Optionally, the projection of the fourth pad 1213 on the first cover film 2 is located within the fourth window 24. In other words, the projection of the fourth pad 1213 in the thickness direction of the flexible circuit board is located within the projection of the fourth window 24 in the thickness direction of the flexible circuit board.

[0059] Thereby, the whole of the fourth pad 1213 is exposed within the fourth window 24, which not only facilitates the soldering of the wire to the fourth pad 1213 and further improves the fuse repair efficiency of the flexible circuit board, but also helps to increase the connection area between the wire and the fourth pad 1213 and improve the connection reliability between the wire and the fourth pad 1213.

[0060] Optionally, the flexible circuit board further includes a first insulating layer and a second insulating layer, and the first insulating layer and the second insulating layer are separably connected to the first cover film 2. The first insulating layer seals the first window 21, and the second insulating layer seals the second window 22.

[0061] Among them, the first insulating layer and the second insulating layer can be insulating tapes. The insulating tapes are bonded to the first covering film 2. When it is necessary to repair the first fuse 112, the insulating tapes are torn off so that both ends of the first fuse 112 are exposed through the first window 21 and the second window 22 respectively. The first insulating layer and the second insulating layer can be hot melt adhesive layers. The hot melt adhesive layers are thermally connected to the first covering film 2. When it is necessary to repair the first fuse 112, hot air is blown on the hot melt adhesive layers to blow off the hot melt adhesive layers so that both ends of the first fuse 112 are exposed through the first window 21 and the second window 22 respectively.

[0062] By providing the first insulating layer and the second insulating layer, the first fuse 112 can be prevented from being exposed to the outside, the protection of the first fuse 112 can be achieved, and the service life of the flexible circuit board can be extended.

[0063] Optionally, the flexible circuit board further includes a third insulating layer and a fourth insulating layer. The third insulating layer and the fourth insulating layer are separably connected to the first covering film 2. The third insulating layer seals the third window 23, and the fourth insulating layer seals the fourth window 24.

[0064] Among them, the third insulating layer and the fourth insulating layer can be insulating tapes. The insulating tapes are bonded to the first covering film 2. When it is necessary to repair the second fuse 121, the insulating tapes are torn off so that both ends of the second fuse 121 are exposed through the third window 23 and the fourth window 24 respectively. The third insulating layer and the fourth insulating layer can be hot melt adhesive layers. The hot melt adhesive layers are thermally connected to the first covering film 2. When it is necessary to repair the second fuse 121, hot air is blown on the hot melt adhesive layers to blow off the hot melt adhesive layers so that both ends of the second fuse 121 are exposed through the third window 23 and the fourth window 24 respectively.

[0065] By providing the third insulating layer and the fourth insulating layer, the second fuse 121 can be prevented from being exposed to the outside, the protection of the second fuse 121 can be achieved, and the service life of the flexible circuit board can be extended.

[0066] The repair method of the flexible circuit board according to the embodiment of the present invention includes the following steps;

[0067] Judge whether the first fuse 112 is blown;

[0068] When the first fuse 112 is blown, both ends of the first fuse 112 are electrically connected to both ends of the second fuse 121 by using a wire, so that the second fuse 121 is electrically connected to the circuit 111. Among them, the wire can be a wire with an insulating layer.

[0069] When the first fuse 112 melts, the pads at both ends of the first fuse 112 are electrically connected to the pads at both ends of the second fuse 121 by wires, so that the second fuse 121 is electrically connected to the circuit 111, and the melted first fuse 112 is replaced with the second fuse 121. That is, the repair of the fuse of the flexible circuit board is realized, thus avoiding the scrapping of the flexible circuit board due to the melting of the fuse.

[0070] Optionally, by observing the first cover film 2, it is judged whether the first fuse 112 melts.

[0071] For example, when the first cover film 2 bulges, or ablation marks appear on the first window 21 or the second window 22, it is judged that the first fuse 112 at that place melts. Thus, it is convenient to judge whether the first fuse 112 melts.

[0072] In the flexible circuit board of the embodiment of the present invention, a second fuse 121 is arranged as a spare fuse in the non-circuit area 12, and pads are respectively arranged at both ends of the first fuse 112 and the second fuse 121, and windows corresponding to the pads are arranged on the first cover film 2, so that the pads can be exposed to the outside through the windows. When a certain first fuse 112 melts, the two ends of the melted first fuse 112 can be connected to the two ends of the second fuse 121 by means of flying wire spot welding, that is, the pads at both ends of the first fuse 112 are connected to the pads at both ends of the second fuse 121, and the second fuse 121 replaces the original first fuse 112 to realize short-circuit protection. In order to prevent the pads of the first fuse 112 and the second fuse 121 from being exposed to the air, it is possible to choose to paste an insulating tape on the surface of the pads or set a hot melt adhesive layer to protect the pads.

[0073] The integrated busbar (Cells Contact System, abbreviated as CCS) of the embodiment of the present invention includes a bracket, a plurality of busbars and a flexible circuit board, and the busbars are connected to the bracket. The flexible circuit board is the flexible circuit board described in any of the above embodiments, and the circuit 111 is electrically connected to the busbar. Among them, the busbar and the bracket can be integrally injection molded.

[0074] Since the repair of the fuse of the flexible circuit board can be realized, therefore, the integrated busbar of the embodiment of the present invention can be repaired after the fuse of the flexible circuit board melts, and the whole integrated busbar will not be scrapped. Thus, it is possible to avoid the integrated busbar from being scrapped due to the melting of the fuse of the flexible circuit board.

[0075] The battery pack of the embodiment of the present invention includes a plurality of battery cells and an integrated busbar, the integrated busbar is the integrated busbar described in any of the above embodiments, and the busbar is electrically connected to the battery cells. Among them, the circuit 111 can be used to realize the voltage acquisition of the battery cells.

[0076] Since the above integrated busbar will not be scrapped due to the fuse blow of the flexible circuit board, it is possible to avoid the battery pack of the embodiment of the present invention from being scrapped due to the fuse blow of the flexible circuit board.

[0077] The vehicle of the embodiment of the present invention includes the battery pack described in any one of the above embodiments. Among them, the vehicle can be a pure electric vehicle or a hybrid electric vehicle.

[0078] Since the battery pack of the embodiment of the present invention will not be scrapped due to the fuse blow of the flexible circuit board, the vehicle of the embodiment of the present invention has the advantages of low battery pack maintenance cost and the like.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A flexible circuit board, characterized in that, Comprising: A conductive layer, the conductive layer including a circuit, a first fuse, and a second fuse, the first fuse being electrically connected to the circuit, and there being a gap between the second fuse and the circuit; A first cover film and a second cover film, the first cover film and the second cover film being respectively disposed on two sides in the thickness direction of the conductive layer and connected to the conductive layer, the first cover film being provided with a first window, a second window, a third window, and a fourth window; Wherein, the first window and the second window are respectively disposed corresponding to the pads at both ends of the first fuse, and the third window and the fourth window are respectively disposed corresponding to the pads at both ends of the second fuse.

2. The flexible circuit board according to claim 1, the pads at both ends of the first fuse being respectively a first pad and a second pad, the first window being disposed corresponding to the first pad, the second window being disposed corresponding to the second pad, the projection of the first pad on the first cover film being located within the first window, and the projection of the second pad on the first cover film being located within the second window; and / or The pads at both ends of the second fuse being respectively a third pad and a fourth pad, the third window being disposed corresponding to the third pad, the fourth window being disposed corresponding to the fourth pad, the projection of the third pad on the first cover film being located within the third window, and the projection of the fourth pad on the first cover film being located within the fourth window.

3. The flexible circuit board according to claim 1, wherein The conductive layer includes a circuit area and a non-circuit area, the circuit and the first fuse are both disposed in the circuit area, and the second fuse is disposed in the non-circuit area.

4. The flexible circuit board according to claim 3, characterized in that, The non-circuit area is provided with multiple reinforcing metals, the second fuse is disposed between the multiple reinforcing metals, and there is a gap between the second fuse and the reinforcing metals.

5. The flexible circuit board according to claim 1, wherein The numbers of the circuit, the first fuse, and the second fuse are all multiple, there is a gap between adjacent two of the first fuses, and there is a gap between adjacent two of the second fuses; Adjacent two of the first fuses are connected in series with the same circuit, and / or, adjacent two of the first fuses are respectively electrically connected to two circuits.

6. The flexible circuit board according to any one of claims 1-5, characterized in that The flexible circuit board further includes a first insulating layer and a second insulating layer, the first insulating layer and the second insulating layer are separably connected to the first cover film, the first insulating layer seals the first window, and the second insulating layer seals the second window; and / or The flexible circuit board further includes a third insulating layer and a fourth insulating layer, the third insulating layer and the fourth insulating layer are separably connected to the first cover film, the third insulating layer seals the third window, and the fourth insulating layer seals the fourth window.

7. A repair method for a flexible circuit board, characterized in that, The flexible circuit board is the flexible circuit board according to any one of claims 1-6, including the following steps: Judging whether the first fuse is blown; When the first fuse is blown, electrically connecting the pads at both ends of the first fuse to the pads at both ends of the second fuse respectively by using a wire, so that the second fuse is electrically connected to the circuit.

8. An integrated busbar, characterized in that, Comprising: A bracket; Multiple busbars, the busbars being connected to the bracket; A flexible circuit board, the flexible circuit board being the flexible circuit board according to any one of claims 1-6, and the circuit being electrically connected to the busbar.

9. A battery pack, characterized in that, Comprising: Multiple battery cells; An integrated busbar, the integrated busbar being the integrated busbar according to claim 8, and the busbar being electrically connected to the battery cell.

10. A vehicle, characterized in that, Including the battery pack according to claim 9.

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