A signal acquisition harness for a vehicle's power battery

Abstract

The present invention provides a signal acquisition harness for a vehicle's power battery. The harness has a reasonable structure and can be stably and reliably installed with a battery pack to avoid damage caused by pulling or vibration due to bulging, thereby ensuring the service life and reliability of the battery signal acquisition harness. The harness comprises a flexible circuit board, an L-shaped through groove is provided on the flexible circuit board to form a cantilever beam area, a connecting piece is provided on the cantilever beam area, the flexible circuit board is connected to a single battery through the connecting piece, and an insulating protective layer is formed on the upper and lower surfaces of the connection between the connecting piece and the cantilever beam area by dispensing glue.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a signal acquisition harness for a power battery of a vehicle. Background Art

[0002] In the automotive sector, as traditional energy sources become increasingly problematic, vehicle exhaust emissions have become a major source of smog in my country. The government has implemented strategies for energy conservation, emission reduction, and the development of new energy vehicles. Batteries are widely used due to their convenient, recyclable nature. In particular, in electric vehicles, achieving high power and capacity often requires connecting individual cells in series and parallel to form battery modules.

[0003] To ensure the proper functioning of the battery module, the vehicle management system must monitor the module in real time, collect the voltage signals of each cell, and evaluate the performance of each cell. The battery signal acquisition harness is a device designed to collect signals such as battery voltage, current, and temperature.

[0004] Figure 1 This is a schematic diagram of an existing power battery signal acquisition harness. It's typically long, but there's a demand for battery signal acquisition harnesses longer than two meters. Existing production lines and equipment are no longer suitable for producing such extra-long cables. Redesigning the lines and equipment would incur significant costs, and producing harnesses longer than two meters is also challenging.

[0005] For example, the Chinese utility model patent with publication number CN209544400U discloses a battery pack wiring structure. However, due to the complex working conditions of the vehicle, the battery module of the electric vehicle often bulges due to wear and tear after long-term use, pulling the battery signal acquisition harness, or the battery module is vibrated under long-term harsh working conditions, causing the battery signal acquisition harness to be damaged, thereby causing the signal acquisition of the vehicle's battery management system to fail. At the same time, if the battery pack wiring can be better installed on the battery module to increase the reliability of the installation and avoid damage to the circuit board due to vibration under long-term harsh working conditions, it is also a problem. Summary of the Invention

[0006] In response to the above problems, the present invention provides a signal acquisition harness for a vehicle's power battery, which has a reasonable structure and can be installed firmly and reliably with the battery pack to avoid damage due to bulging, pulling or vibration, thereby ensuring the service life and reliability of the battery signal acquisition harness.

[0007] The technical solution is as follows: a signal acquisition harness for a vehicle's power battery, including a flexible circuit board, characterized in that an L-shaped through-slot is opened on the flexible circuit board to form a cantilever beam area, a connecting piece is provided on the cantilever beam area, the flexible circuit board is connected to the single battery through the connecting piece, and an insulating protective layer is formed on the upper and lower surfaces of the connection between the connecting piece and the cantilever beam area by dispensing glue.

[0008] Furthermore, the connecting piece is welded to the flexible circuit board through a solder pad, and the insulating protective layer extends outward from the cantilever beam area to form an extension portion, and the extension portion extends outward to the connecting piece located outside the cantilever beam area. The extension portion fits together in an area that does not contact the connecting piece, and the side edges of the insulating protective layer other than the extension portion do not exceed the edge of the cantilever beam area.

[0009] Furthermore, the outer side of the cantilever beam area is flush with the side of the flexible circuit board.

[0010] Furthermore, grooves are staggeredly arranged on both sides of the area where the flexible circuit board is connected to the cantilever beam area to form an S-shaped spring area.

[0011] Furthermore, the connecting piece includes an ordinary connecting piece and an NTC connecting piece, the ordinary connecting piece is a nickel piece, and a soldering pad is provided on the nickel piece; the NTC connecting piece includes a nickel piece, and a window area and a soldering pad are provided on the nickel piece, and an NTC device is provided in the window area to contact the flexible circuit board.

[0012] Furthermore, a bending portion is provided on the connecting piece, and the bending portion is any one of an upward bending portion and a downward bending portion, and the bending portion has an arc-shaped, broken line-shaped or trapezoidal cross section.

[0013] Furthermore, a mark point is provided on the flexible circuit board corresponding to each cantilever beam area for processing positioning in the SMT process.

[0014] Furthermore, an avoidance groove is provided on the flexible circuit board corresponding to the power battery, a circuit board fixing block is provided on the avoidance groove, and a fixing hole is also provided on the circuit board fixing block for fixing the flexible circuit board on the power battery, and an NTC device installation area is also provided on the circuit board fixing block.

[0015] Furthermore, a fuse part is connected to the copper wire of the flexible circuit board. The fuse part includes a fuse arranged in a serpentine shape. The thickness of the fuse is smaller than the thickness of the copper wire on the circuit board.

[0016] Furthermore, non-functional copper layers with the same specifications are provided on both sides of the fuse part, and the copper wires connecting the two sides of the fuse part have the same specifications.

[0017] The signal acquisition harness of the power battery of the vehicle of the present invention is formed by a cantilever beam area provided on the flexible circuit board. The cantilever beam area is formed by an L-shaped through groove provided on the flexible circuit board, which can provide the signal acquisition harness with a buffering space to cope with the pulling of the battery signal acquisition harness caused by bulging of the battery module after long-term use and the pulling of the battery signal acquisition harness caused by vibration of the battery module in harsh working conditions. At the same time, an S-shaped spring area is also provided in the area where the cantilever beam area is connected to the circuit board, which can further achieve buffering of the pulling and avoid the signal acquisition harness being torn due to pulling. In addition, a bending portion is also designed on the connecting piece of the present invention, and the bending portion can generally provide a buffering space to cope with the pulling of the battery module during operation. The battery signal acquisition harness is pulled due to bulging after long-term use, and the battery signal acquisition harness is pulled due to vibration of the battery module in harsh working conditions, so as to avoid damage to the battery signal acquisition harness; in the present invention, the outer edge of the cantilever beam area is flush with the side edge of the flexible circuit board, which can improve the utilization rate of the plate and reduce costs; in order to facilitate processing and positioning, a mark point is provided on the flexible circuit board corresponding to each cantilever beam area. In addition, the signal acquisition harness of the power battery of the vehicle of the present invention is better adhered to the battery module by providing an avoidance groove, thereby improving the reliability of installation. By also providing an NTC device on the connecting piece and the circuit board fixing block, the temperature signal can be better collected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a signal acquisition harness for a power battery of a vehicle according to the present invention;

[0019] Figure 2 This is a schematic diagram of a common connecting piece of the present invention installed on a signal acquisition harness;

[0020] Figure 3 This is a schematic diagram of the NTC connector of the present invention being installed on a signal acquisition harness;

[0021] Figure 4 A schematic diagram of a signal acquisition harness in one embodiment of the present invention;

[0022] Figure 5 Schematic diagram of a side view of a connecting piece in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0024] See Figure 1 The present invention discloses a signal acquisition harness for a vehicle's power battery, comprising a flexible circuit board 1. An L-shaped through-slot 2 is defined in the flexible circuit board 1 to form a cantilever beam region 3. A connecting piece 4 is disposed on the cantilever beam region 3. The flexible circuit board 1 is connected to a single battery cell via the connecting piece 4. Insulating protective layers 5 are formed on the upper and lower surfaces of the connection between the connecting piece 4 and the cantilever beam region 3 by dispensing adhesive. The flexible circuit board 1 is also connected to a connector 12.

[0025] Specifically, the connecting piece 4 is welded to the flexible circuit board 1 through the soldering pad, and the insulating protective layer 5 extends outward from the cantilever beam area to form an extension portion 501, and the extension portion 501 extends outward to the connecting piece 4 located outside the cantilever beam area 3, and the extension portion 501 fits together in the area not in contact with the connecting piece 4, and the side edges of the insulating protective layer 5 except the extension portion 501 do not exceed the edge setting of the cantilever beam area 3. The insulating protective layer is formed by dispensing to protect the flexible circuit board and the connecting piece, and the insulating protective layer extends outward from the cantilever beam area to form an extension portion, and the extension portion extends outward to the connecting piece located outside the cantilever beam area, and the extension portion fits together in the area not in contact with the connecting piece, and the side edges of the insulating protective layer except the extension portion do not exceed the edge setting of the cantilever beam area. Such a setting ensures the insulation effect at the connection between the connecting piece and the circuit board.

[0026] Specifically, the outer side 301 of the cantilever beam area 3 is flush with the side of the flexible circuit board 1 , and grooves are staggeredly arranged on both sides of the area where the flexible circuit board 1 and the cantilever beam area 3 are connected to form an S-shaped spring area 6 .

[0027] See Figure 2 、 Figure 3 In one embodiment of the present invention, the connecting piece includes a common connecting piece 41 and an NTC connecting piece 42. The common connecting piece 41 is a nickel sheet with a soldering pad provided thereon. The NTC connecting piece 42 includes a nickel sheet with a window area 421 and a soldering pad provided thereon. The window area is provided with an NTC device 422 in contact with the flexible circuit board 1.

[0028] See Figure 5In one embodiment of the present invention, a bending portion 401 is provided on the connecting piece 4. The bending portion 401 is any one of an upward bending portion and a downward bending portion. The bending portion 401 has an arc-shaped cross section, a broken line shape, or a trapezoidal cross section. The bending portion can generally provide room for buffering to cope with the pulling of the battery signal acquisition harness caused by the bulging of the battery module after long-term use and the pulling of the battery signal acquisition harness caused by the vibration of the battery module in harsh working conditions, thereby avoiding damage to the battery signal acquisition harness.

[0029] In the embodiment of the present invention, a mark point 7 is provided on the flexible circuit board 1 corresponding to each cantilever beam area for processing positioning in the SMT process.

[0030] In an embodiment of the present invention, an avoidance groove 8 is provided on the flexible circuit board 1 corresponding to the power battery, and a circuit board fixing block 9 is provided on the avoidance groove. The circuit board fixing block 9 is also provided with a fixing hole 901 for fixing the flexible circuit board 1 on the power battery. The circuit board fixing block is also provided with an NTC device installation area 902 for setting the NTC device.

[0031] See Figure 4 In one embodiment of the present invention, a fuse unit 10 is connected to the copper wire of the flexible circuit board 1. The fuse unit 10 includes a fuse arranged in a serpentine shape. The thickness of the fuse is smaller than the thickness of the copper wire on the circuit board.

[0032] In addition, non-functional copper layers 11 of the same specifications are provided on both sides of the fuse unit 10 , and the copper wires 13 connecting the two sides of the fuse unit 10 have the same specifications.

[0033] In an embodiment of the present invention, a fuse portion is connected to the copper wire of the circuit board, and the fuse portion includes a fuse arranged in a serpentine shape. The thickness of the fuse is smaller than the copper wire on the circuit board. When an abnormality occurs in the battery and the current passing through is too large, the fuse generates a large amount of heat due to its serpentine arrangement in a very small area, and because its thickness is smaller than the thickness of the copper wire on the circuit board, the fuse will be the first to melt and cut off the circuit, avoiding damage to the entire battery management system and ensuring safety. In addition, in the present invention, by providing non-functional copper layers of consistent specifications on both sides of the fuse portion, and providing the copper wires connecting the two sides of the fuse portion with the same specifications, it is ensured that the surrounding environment of the fuse is consistent, the heat dissipation is consistent, and the melting environment of the fuse is consistent, thereby avoiding accidental melting and damage.

[0034] The signal acquisition harness of the power battery of the vehicle of the present invention is formed by a cantilever beam area provided on the flexible circuit board. The cantilever beam area is formed by an L-shaped through groove provided on the flexible circuit board, which can provide the signal acquisition harness with a buffering space to cope with the pulling of the battery signal acquisition harness caused by bulging of the battery module after long-term use and the pulling of the battery signal acquisition harness caused by vibration of the battery module in harsh working conditions. At the same time, an S-shaped spring area is also provided in the area where the cantilever beam area is connected to the circuit board, which can further achieve buffering of the pulling and avoid the signal acquisition harness being torn due to pulling. In addition, a bending portion is also designed on the connecting piece of the present invention, and the bending portion can generally provide a buffering space to cope with the pulling of the battery module during operation. The battery signal acquisition harness is pulled due to bulging after long-term use, and the battery signal acquisition harness is pulled due to vibration of the battery module in harsh working conditions, so as to avoid damage to the battery signal acquisition harness; in the present invention, the outer edge of the cantilever beam area is flush with the side edge of the flexible circuit board, which can improve the utilization rate of the plate and reduce costs; in order to facilitate processing and positioning, a mark point is provided on the flexible circuit board corresponding to each cantilever beam area. In addition, the signal acquisition harness of the power battery of the vehicle of the present invention is better adhered to the battery module by providing an avoidance groove, thereby improving the reliability of installation. By also providing an NTC device on the connecting piece and the circuit board fixing block, the temperature signal can be better collected.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0036] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A signal acquisition harness for a vehicle's power battery, comprising a flexible circuit board, characterized in that: An L-shaped through groove is formed on the flexible circuit board to form a cantilever beam area. A connecting piece is provided on the cantilever beam area. The flexible circuit board is connected to the single battery through the connecting piece. An insulating protective layer is formed on the upper and lower surfaces of the connection between the connecting piece and the cantilever beam area by dispensing glue. Grooves are staggeredly arranged on both sides of the area where the flexible circuit board is connected to the cantilever beam area to form an S-shaped spring area; The connecting piece includes a common connecting piece and an NTC connecting piece, wherein the common connecting piece is a nickel piece with a soldering pad provided thereon; the NTC connecting piece includes a nickel piece with a window area and a soldering pad provided thereon, wherein an NTC device is provided in the window area and contacts the flexible circuit board; The connecting piece is provided with a bending portion, wherein the bending portion is any one of an upward bending portion and a downward bending portion, and the bending portion has a cross section that is any one of an arc shape, a broken line shape, or a trapezoidal shape; An avoidance groove is provided on the flexible circuit board corresponding to the power battery, a circuit board fixing block is provided on the avoidance groove, and a fixing hole is further provided on the circuit board fixing block for fixing the flexible circuit board on the power battery, and an NTC device mounting area is also provided on the circuit board fixing block; A fuse unit is connected to the copper wire of the flexible circuit board, and the fuse unit includes a fuse arranged in a serpentine shape, and the thickness of the fuse is smaller than the thickness of the copper wire on the circuit board; Non-functional copper layers with the same specifications are provided on both sides of the fuse part, and the copper wires connecting the two sides of the fuse part have the same specifications.

2. The signal acquisition harness for a power battery of a vehicle according to claim 1, characterized in that: The connecting piece is welded to the flexible circuit board through a solder pad, and the insulating protective layer extends out of the cantilever beam area to form an extension portion, and the extension portion extends outward to the connecting piece located outside the cantilever beam area. The extension portion is adhered to each other in an area that does not contact the connecting piece, and the side edges of the insulating protective layer other than the extension portion do not exceed the edge of the cantilever beam area.

3. The signal acquisition harness for a power battery of a vehicle according to claim 1, characterized in that: The outer side of the cantilever beam area is flush with the side of the flexible circuit board.

4. The signal acquisition harness for a power battery of a vehicle according to claim 1, characterized in that: A mark point is provided on the flexible circuit board corresponding to each cantilever beam area for processing positioning in the SMT process.

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