Wiring method of battery module flexible circuit board

Abstract

The invention discloses a wiring method of a flexible circuit board of a battery module, the flexible circuit board adopts a single-sided board and is provided with a plurality of pin bonding pads and a plurality of nickel sheet bonding pads, and the wiring method of the flexible circuit board comprises the following steps: if adjacent pins need to be connected to the same nickel sheet bonding pad, the adjacent pins are connected to the same nickel sheet bonding pad; the method comprises the following steps of: directly doubling adjacent pins on a flexible circuit board substrate by using a sampling copper wire, and then pulling the pins to the position of the same nickel sheet bonding pad; if the non-adjacent pins need to be connected to the same nickel pad, the pins adjacent to the nickel pad are directly connected to the nickel pad by adopting a sampling copper wire, and the pins farther from the nickel pad are pulled to the same nickel pad from the adjacent edge of the flexible circuit board substrate in a surrounding manner by adopting the sampling copper wire; and for a single pin, a sampling copper wire is directly pulled to a corresponding nickel sheet bonding pad position. The space utilization rate of the whole battery system is optimized, and the energy density of the whole battery system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of battery modules, and in particular to a wiring method for a flexible circuit board of a battery module. Background Art

[0002] Flexible Printed Circuit (FPC) is a printed circuit board made of polyimide or polyester film. In the current power battery system, the use of FPC for wiring harness layout can greatly improve the space utilization of the battery module and the energy density of the battery system. However, when the connector pins need to be processed across the pins, in order to avoid the cross-wiring caused by the single-sided FPC wiring design, which affects other lines, the existing technology usually requires a double-sided FPC (structure such as Figure 1 Design shown in Figure 1 It can be seen that the FPC double-sided board structure is more complicated, and the newly added hole wall copper plating method has higher process requirements than the single-sided board structure, which will increase the difficulty of FPC production and increase costs.

[0003] If a single-sided board is used, for the battery module, the pin number of the connector is consistent with the sequence of the corresponding battery module series, so it is impossible to achieve the situation where the FPC wiring does not cross by jumping the pin number. If it is not used, it will cause the FPC wiring to cross the connector pins to achieve battery module sampling, which will reduce the connector pin utilization rate, thereby reducing the space utilization rate of the battery system, and ultimately affecting the energy density of the entire battery system. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a wiring method for a battery module flexible circuit board which can optimize the space utilization of the entire battery system and improve the energy density of the entire battery system.

[0005] The present invention is implemented as follows: a wiring method for a flexible circuit board of a battery module, wherein the flexible circuit board adopts a single-sided board, is provided with a plurality of pin pads and a plurality of nickel sheet pads, pins are inserted into the pin pads, and the nickel sheet on the nickel sheet pad is connected to the battery by laser welding. The wiring method for the flexible circuit board comprises the following steps:

[0006] S1. If adjacent pins need to be connected to the same nickel pad, use the sampling copper wire directly from the flexible circuit board substrate to connect the adjacent pins, and then pull them to the same nickel pad position;

[0007] S2. If non-adjacent pins need to be connected to the same nickel pad, the pins adjacent to the nickel pad are directly connected to the nickel pad using a sampling copper wire, and the pins farther from the nickel pad are pulled around the adjacent edge of the flexible circuit board substrate to the same nickel pad using a sampling copper wire;

[0008] S3. For a single pin, directly use the sampling copper wire to pull it to the corresponding nickel sheet pad position.

[0009] Preferably, there is no crossing of all the sampled copper wires.

[0010] Preferably, the flexible circuit board has the smallest area under the premise that all the sampling copper wires do not cross each other.

[0011] The advantages and technical effects of the present invention are as follows:

[0012] 1. A new FPC wiring method is proposed, which can avoid the complicated process of using double-layer FPC to a certain extent. Under the premise of not reducing the utilization rate of connector pins, the same effect can be achieved by using single-layer FPC, which also reduces the production cost.

[0013] 2. The FPC wiring method of the present invention can also optimize the space utilization of the entire battery system and improve the energy density of the entire battery system.

[0014] 3. With the trend of large-scale modularization of power battery systems, the number of voltage sampling harnesses required will increase greatly. The present invention conforms to the future development trend of power battery systems and has certain market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the FPC double-sided board stacking of the prior art wiring method;

[0016] Figure 2 It is a schematic diagram of a wiring method of a battery module flexible circuit board of the present invention;

[0017] Figure 3 It is an enlarged schematic diagram of the pins of the flexible circuit board of the battery module of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “middle”, “lower”, “inside”, “outside”, and “both sides” are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figure 2As shown, the wiring method of the battery module flexible circuit board of the present invention, the flexible circuit board adopts a single-sided board, is provided with a plurality of pin pads 13 and a plurality of nickel sheet pads 14, pins are inserted into the pin pads, and the nickel sheet on the nickel sheet pad is connected to the battery by laser welding. The wiring method of the flexible circuit board includes the following steps:

[0021] S1. If adjacent pins need to be connected to the same nickel pad, use the sampling copper wire directly from the flexible circuit board substrate to connect the adjacent pins, and then pull them to the same nickel pad position;

[0022] S2. If non-adjacent pins need to be connected to the same nickel pad, the pins adjacent to the nickel pad are directly connected to the nickel pad using a sampling copper wire, and the pins farther from the nickel pad are pulled around the adjacent edge of the flexible circuit board substrate to the same nickel pad using a sampling copper wire;

[0023] S3. For a single pin, directly use the sampling copper wire to pull it to the corresponding nickel sheet pad position.

[0024] Preferably, there is no crossing among all the sampled copper wires.

[0025] Preferably, the flexible circuit board has the smallest area under the premise that all sampling copper wires do not cross each other.

[0026] The present invention will be described below in conjunction with specific embodiments. Figure 2 As shown, in this embodiment, a 12-pin connector is placed on a single FPC panel as an example, and the connector pin numbers are as follows: Figure 3 shown.

[0027] When the adjacent pins 8 and 9 are paralleled, the sampling copper wire 12 can be directly paralleled from the FPC substrate and then pulled to the nickel sheet pad 16 position.

[0028] When paralleling pin 1 and pin 6, the sampling copper wire 17 can be used to connect pin 6 first, then it can be wrapped around the FPC substrate and then connected to the nickel sheet pad 19 at the sampling point corresponding to the battery module.

[0029] The other pins can be sequentially welded to the corresponding nickel sheet pads of the battery module.

[0030] The wiring method of the present invention can avoid the cross-wiring of the connector across the pins without using a double-layer FPC structure, thereby reducing the difficulty of making the FPC of the battery module, that is, using a single-layer FPC structure to replace the double-layer FPC structure. By improving the wiring method of the battery module flexible circuit board across the pins and paralleling, the connector across the pins and paralleling can be realized without using a double-sided board, and the design can be simplified, the production difficulty can be reduced, and the production cost can be saved without reducing the reliability of the battery module flexible circuit board wiring.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wiring method for a flexible circuit board of a battery module, wherein the flexible circuit board adopts a single-sided board, is provided with a plurality of pin pads and a plurality of nickel sheet pads, pins are inserted into the pin pads, and the nickel sheet on the nickel sheet pad is connected to the battery by laser welding, characterized in that: The wiring method of the flexible circuit board includes the following steps: S1. If adjacent pins need to be connected to the same nickel pad, use the sampling copper wire directly from the flexible circuit board substrate to connect the adjacent pins, and then pull them to the same nickel pad position; S2. If non-adjacent pins need to be connected to the same nickel pad, the pins adjacent to the nickel pad are directly connected to the nickel pad using a sampling copper wire, and the pins farther from the nickel pad are pulled around the adjacent edge of the flexible circuit board substrate to the same nickel pad using a sampling copper wire; S3. For a single pin, directly use the sampling copper wire to pull it to the corresponding nickel sheet pad position.

2. The wiring method of the battery module flexible circuit board according to claim 1, characterized in that: There is no crossing among all the sampled copper wires.

3. The wiring method of the battery module flexible circuit board according to claim 1, characterized in that: The flexible circuit board has the smallest area under the premise that all the sampled copper wires do not cross each other.

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