Battery pack detection plate conductive connection structure and processing technology thereof

Abstract

The invention discloses a battery pack detection board conductive connection structure and a processing technology thereof, the conductive connection structure comprises an FPC connection body, the first side of the FPC connection body is provided with a connection bonding pad used for being electrically connected with a detection board, the second side of the FPC connection body is provided with a connection lug, and the FPC connection body is printed with a conductive circuit used for realizing electric signal transmission; and the first end of the conductive connecting sheet is electrically connected with the connecting lug, and the second end is electrically connected with the bus metal bar. When in use, the connection bonding pad is welded with the detection board, the conductive connection sheet is welded with the confluence metal bar to form conductive connection between the detection board and the confluence metal bar, and as the FPC connection body has better tensile property, when mechanical vibration is generated in the transportation process, the mechanical vibration can be buffered through the FPC connection body; according to the utility model, deformation of the conductive connection structure is reduced, the overall tensile property is effectively improved, the flexibility and extensibility are improved, and the conductive connection structure has better anti-vibration performance.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a conductive connection structure of a battery pack detection board and a processing technology thereof. Background Art

[0002] With the rapid development of energy storage technology, the application of batteries has become more and more extensive, so the requirements for battery safety and reliability are getting higher and higher. In order to monitor the operating status of the battery pack, a detection device is usually set on the battery pack to monitor the temperature, safety valve status and other information during the operation of the battery pack. The existing detection device includes: a circuit board as a detection board, a busbar, and a connector for connecting the detection board and the busbar. In order to reduce costs, a PCB circuit board is used as the detection board, and the two ends of the connector are respectively welded and fixed to the detection board and the busbar.

[0003] Since the connectors are welded and fixed to form a rigid connection with the detection board and the busbar, collision or mechanical vibration is inevitable during transportation. The rigid connection method can easily cause the detection board and the connector to loosen or even deform and damage when subjected to long-term mechanical vibration, thereby affecting the normal use of the battery pack. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a conductive connection structure of a battery pack inspection board and a processing technology thereof, which have the advantage of effectively improving the tensile strength.

[0005] The purpose of the present invention is achieved by the following technical solutions: According to a first aspect of an embodiment of the present disclosure, there is provided a battery pack detection board conductive connection structure, comprising: An FPC connection body, a first side of which is provided with a connection pad for electrical connection with the detection board, a second side of which is formed with a connection ear piece, and a conductive circuit is printed on the FPC connection body for realizing electrical signal transmission; The conductive connecting piece has a first end electrically connected to the connecting ear piece and a second end electrically connected to the bus bar.

[0006] To implement the above technical solution, when in use, the FPC connection body is welded to the detection board through the connecting pad, and the conductive connecting sheet is welded to the bus metal bus, so that the FPC connection body and the conductive connecting sheet are used as conductors to form a conductive connection between the detection board and the bus metal bus. Since the FPC connection body has good tensile strength, when mechanical vibration is generated during transportation, it can be buffered by the FPC connection body to reduce the deformation of the conductive connection structure, and effectively improve the overall tensile strength, improve flexibility and extensibility, and have better vibration resistance.

[0007] In some exemplary embodiments, a deformation groove is provided in the FPC connection body between the connection pad and the connection ear piece, and a micro connection structure is formed on one side of the deformation groove.

[0008] By implementing the above technical solution, the mechanical buffering performance of the FPC connection body can be further improved through the deformation groove, and the stability of the FPC connection body structure can be maintained through the micro-connection structure, thereby reducing the deformation of the FPC connection body.

[0009] In some exemplary embodiments, a temperature sensor is further provided on the conductive connecting sheet for collecting temperature information transmitted by the corresponding bus bar.

[0010] By implementing the above technical solution and arranging the temperature sensor on the conductive connecting sheet, the collected temperature signal can be made more accurate.

[0011] In some exemplary embodiments, a receiving groove is provided on the conductive connecting sheet for receiving the temperature sensor, and clamping spring pieces are symmetrically provided on both sides of the receiving groove, and the clamping spring pieces are used to clamp and fix the temperature sensor.

[0012] Implementing the above technical solution makes it easy to connect and fix the temperature sensor.

[0013] In some exemplary embodiments, a welding groove is further provided on the conductive connecting sheet at one side of the receiving groove.

[0014] The above technical solution is implemented to facilitate welding and fixing the conductive connecting piece and the connecting ear piece.

[0015] In some exemplary embodiments, the conductive connecting sheet is arranged along an extension direction perpendicular to the detection board; Alternatively, the connecting ear piece extends outward from the second side of the FPC connecting body, and the conductive connecting piece is arranged along an extending direction parallel to the detection board.

[0016] According to a second aspect of an embodiment of the present disclosure, a processing technology for a conductive connection structure of a battery pack detection board is provided, including: Forming conductive circuits on the FPC substrate according to a predetermined process flow; Punching the FPC substrate to form an FPC connection body, wherein a connection pad is provided on a first side of the FPC connection body for electrical connection with the detection board, and a connection ear is formed on a second side; The pre-processed conductive connecting piece and the connecting ear piece are welded and fixed to form a conductive connecting structure; The conductive connection structure is welded to a preset connection point of the detection board through a connection pad so that the conductive connection piece is located outside the detection board for electrical connection with the busbar.

[0017] To implement the above technical solution, the FPC connecting body is used to realize the conductive connection between the detection board and the conductive connecting piece. For the convenience of processing, a number of conductive circuits corresponding to the FPC connecting body are usually formed on the FPC substrate according to the process flow of the FPC circuit board, and then a number of FPC connecting bodies are formed by punching out to improve the processing efficiency; the conductive connecting piece can also be pre-stamped and formed, and it serves as an intermediate conductive part to realize the conductive connection between the FPC connecting body and the bus metal bus. The setting of the connecting ear piece can facilitate welding connection with the conductive connecting piece to form a conductive connection structure. The setting of the connecting pad facilitates welding connection with the detection board. After the conductive connection structure is welded to the detection board through the connecting pad, when assembling the battery pack, the detection board can be assembled to the corresponding position on the battery pack, and the conductive connecting piece can be directly connected to the bus metal bus to realize the conductive connection between the detection board and the bus metal bus.

[0018] In some exemplary embodiments, when the FPC connection body is formed by punching, a deformation groove is formed between the connection pad and the connection ear piece, and a micro connection structure is formed on one side of the deformation groove.

[0019] By implementing the above technical solution, the deformation groove can make a slight deformation of the FPC connection body when it is vibrated to buffer the vibration force, thereby improving the mechanical buffering performance of the FPC connection body, while the micro-connection structure can maintain the stability of the FPC connection body structure and reduce the deformation of the FPC connection body.

[0020] In some exemplary embodiments, a receiving groove is formed on the conductive connecting sheet, and after the pre-processed conductive connecting sheet and the connecting ear sheet are welded and fixed to form a conductive connection structure, the method further includes: A temperature sensor is placed in the receiving groove, and the temperature sensor is welded to the FPC connecting body to directly collect temperature information transmitted by the corresponding busbar.

[0021] To implement the above technical solution, a temperature sensor is provided to directly collect the temperature information of the busbar, thereby realizing temperature monitoring of the battery pack.

[0022] In some exemplary embodiments, a welding groove is further formed on the conductive connecting sheet at one side of the receiving groove.

[0023] The above technical solution is implemented to facilitate the welding connection between the conductive connecting piece and the FPC connecting body.

[0024] In summary, compared with the prior art, the present invention has the following beneficial effects: The embodiment of the present invention provides a conductive connection structure of a battery pack detection board and a processing technology thereof, wherein the conductive connection structure includes: an FPC connection body, a first side of which is provided with a connection pad for electrical connection with the detection board, and a second side is formed with a connection ear, and the FPC connection body is printed with a conductive circuit for realizing electrical signal transmission; a conductive connection sheet, a first end of which is electrically connected to the connection ear, and a second end of which is electrically connected to the bus metal bar. When in use, the FPC connection body is welded to the detection board through the connection pad, and the conductive connection sheet is welded to the bus metal bar, so that the FPC connection body and the conductive connection sheet are used as conductors to form a conductive connection between the detection board and the bus metal bar. Since the FPC connection body has good tensile strength, when mechanical vibration is generated during transportation, it can be buffered by the FPC connection body, reducing the deformation of the conductive connection structure, and effectively improving the overall tensile strength, flexibility and extensibility, and having better anti-vibration performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the conductive connection structure of the battery pack detection board in an embodiment of the present invention.

[0026] Figure 2 It is a front view of the conductive connection structure of the battery pack detection board in an embodiment of the present invention.

[0027] Figure 3 It is a front view of the conductive connection structure of the battery pack inspection board according to another embodiment of the present invention.

[0028] Figure 4 This is a diagram showing the state in which the FPC connection body is welded to the detection board in an embodiment of the present invention.

[0029] Figure 5 This is another real-time state diagram of the FPC connection body being welded to the detection board in the present invention.

[0030] The numbers and letters in the figure represent the corresponding component names: 10. FPC connection body; 11. Connection pad; 12. Connection ear; 13. Deformation groove; 14. Micro connection structure; 20. Conductive connection piece; 21. Temperature sensor; 22. Accommodation groove; 23. Card-mounted spring piece; 24. Welding groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figures 1 to 3 As shown, the first aspect of an embodiment of the present invention provides a conductive connection structure of a battery pack detection board, including: an FPC connection body 10, a first side of which is provided with a connection pad 11 for electrical connection to the detection board, and a second side is formed with a connection ear 12, and a conductive circuit is printed on the FPC connection body 10 for realizing electrical signal transmission; a conductive connection sheet 20, a first end of which is electrically connected to the connection ear 12, and a second end is electrically connected to the bus metal bus.

[0033] Specifically, the FPC connection body 10 is pre-cut from an FPC substrate, and its substrate is usually polyimide. The connecting pad 11 is a fixed welding area on the FPC connection body 10, which can be welded and fixed to the conductive solder joint on the detection board by soldering or other methods. A welding area is also provided on the connecting ear 12 for welding and fixing with the conductive connecting piece 20. The size of the connecting ear 12 needs to be sufficient to form a weld with the conductive connecting piece 20.

[0034] At the same time, a deformation groove 13 is opened in the FPC connection body 10 between the connection pad 11 and the connection ear piece 12, and a micro-connection structure 14 is formed on one side of the deformation groove 13. The deformation groove 13 is in a long strip shape and is located near the middle of the FPC connection body 10, so that the FPC connection body 10 can disperse the vibration force when subjected to mechanical vibration, and the micro-connection structure 14 is naturally formed after the deformation groove 13 is opened; the deformation groove 13 can further improve the mechanical buffering performance of the FPC connection body 10, and the micro-connection structure 14 can maintain the structural stability of the FPC connection body 10 and reduce the deformation of the FPC connection body 10.

[0035] The detection board is a PCB circuit board, and the busbar includes several aluminum bars, which are used to connect adjacent single-cell batteries in series. They can usually be connected to the batteries by aluminum wire welding. The conductive connecting piece 20 uses a hard nickel sheet to have a better conductive effect. The conductive connecting piece 20 can be welded and fixed to the busbar by laser welding.

[0036] In this embodiment, Figure 2 As shown, the connecting ear 12 extends outward from the second side of the FPC connecting body 10, and the conductive connecting piece 20 is arranged along an extension direction parallel to the detection board. It can be understood that in this embodiment, the connecting ear 12 needs to extend above the aluminum bar, so that when the conductive connecting piece 20 is welded to the connecting ear 12, it is also located above the aluminum bar so that the two can be welded and connected.

[0037] In another embodiment, Figure 3As shown, the conductive connecting piece 20 is arranged along an extension direction perpendicular to the detection board. In this embodiment, the connecting ear piece 12 does not need to extend outward, but extends outward from the second end of the conductive connecting piece 20 to the top of the aluminum bar piece to facilitate the welding connection between the two. The advantage of this method is that since the FPC connection body 10 is arranged with a conductive circuit, when the connecting ear piece 12 extends outward to the aluminum bar piece, it will inevitably overlap with the aluminum bar piece, and there is a certain risk of leakage. When this embodiment is adopted, the FPC connection body will not overlap with the aluminum bar piece, thereby eliminating the risk of leakage.

[0038] A temperature sensor 21 is also provided on the conductive connecting piece 20 for collecting temperature information transmitted by the corresponding bus metal bus. The conductive connecting piece 20 also has a good thermal conductivity. Therefore, when the temperature sensor 21 is in contact with the conductive connecting piece 20, the temperature of the bus metal bus can be basically obtained. By setting the temperature sensor 21 on the conductive connecting piece 20, the collected temperature signal can be made more accurate, so as to facilitate thermal runaway monitoring of the battery pack.

[0039] Furthermore, a receiving groove 22 is provided on the conductive connecting piece 20 for receiving the temperature sensor 21, and clamping spring pieces 23 are symmetrically provided on both sides of the receiving groove 22. The clamping spring pieces 23 are used to clamp and fix the temperature sensor 21. The clamping spring pieces 23 can be formed by bending the portion of the conductive connecting piece 20 in the receiving groove 22 upward to facilitate connecting and fixing the temperature sensor 21, and a welding groove 24 is also provided on the conductive connecting piece 20 on one side of the receiving groove 22 to facilitate welding and fixing the conductive connecting piece 20 to the connecting ear piece 12.

[0040] When in use, the FPC connection body 10 is welded to the detection board through the connecting pad 11, and the conductive connecting sheet 20 is welded to the bus metal bus, so that the FPC connection body 10 and the conductive connecting sheet 20 are used as conductors to form a conductive connection between the detection board and the bus metal bus. Since the FPC connection body 10 has good tensile strength, when mechanical vibration occurs during transportation, the FPC connection body 10 can be used for buffering, thereby reducing the deformation of the conductive connection structure, and effectively improving the overall tensile strength, flexibility and extensibility, and having better vibration resistance, thereby solving the shortcomings of traditional hard nickel sheets in resistance to deformation and vibration, which is beneficial to improving the overall performance of the battery pack.

[0041] A second aspect of an embodiment of the present invention provides a processing technology for a conductive connection structure of a battery pack detection board, including: S100, forming a conductive circuit on the FPC substrate according to a predetermined process flow, the specific process flow can adopt the existing FPC circuit board processing process, at least one area corresponding to the conductive connection structure is formed on the FPC substrate, and the conductive circuit is arranged in the area.

[0042] S200 , punching the FPC substrate to form an FPC connection body 10 , wherein a connection pad 11 is provided on a first side of the FPC connection body 10 for electrical connection with a detection board, and a connection ear piece 12 is extended outwardly on a second side.

[0043] It can be understood that the conductive circuit is located on the FPC connection body 10, so that the FPC connection body 10 can perform conductive connection. The connecting pad 11 is a welding area reserved on the FPC connection body 10, which can be reserved and formed when the conductive circuit is formed. The connecting ear 12 is a portion protruding outward from the FPC connection body 10. A welding area is also provided on the connecting ear 12 for welding and fixing with the conductive connecting piece 20. The size of the connecting ear 12 needs to be sufficient to form a weld with the conductive connecting piece 20.

[0044] At the same time, when the FPC connection body 10 is formed by punching, a deformation groove 13 is formed between the connection pad 11 and the connection ear piece 12, and a micro-connection structure 14 is formed on one side of the deformation groove 13. The deformation groove 13 is in a long strip shape and is located near the middle of the FPC connection body 10, so that the FPC connection body 10 can disperse the vibration force when subjected to mechanical vibration. The micro-connection structure 14 is naturally formed after the deformation groove 13 is opened; the deformation groove 13 can be used to slightly deform the FPC connection body 10 when it is vibrated to buffer the vibration force, thereby improving the mechanical buffering performance of the FPC connection body 10, and the micro-connection structure 14 can maintain the stability of the FPC connection body 10 structure and reduce the deformation of the FPC body.

[0045] S300, welding and fixing the pre-processed conductive connecting sheet 20 and the connecting ear sheet 12 to form a conductive connecting structure, wherein the conductive connecting sheet 20 is in a strip shape as a whole, and can be pre-stamped according to the design size, and the conductive connecting sheet 20 and the connecting ear sheet 12 can be welded and connected by soldering, laser welding, etc. The conductive connecting sheet 20 preferably uses a hard nickel sheet to have a better conductive effect.

[0046] Furthermore, a receiving groove 22 is stamped on the conductive connecting sheet 20. After the pre-processed conductive connecting sheet 20 and the connecting ear sheet 12 are welded and fixed to form a conductive connection structure, it also includes: placing a temperature sensor 21 in the receiving groove 22, and welding the temperature sensor 21 to the FPC connecting body 10 for directly collecting the temperature information transmitted by the corresponding bus metal bus; it can be understood that the detection end of the temperature sensor 21 can contact the bus metal bus or the conductive connecting sheet 20 to collect the corresponding temperature information, and the conductive end of the temperature sensor 21 is welded to the FPC connecting body 10 for conductive connection, so as to transmit the collected temperature information to the detection board to realize temperature monitoring of the battery pack.

[0047] At the same time, a welding groove 24 is punched and formed on one side of the receiving groove 22 on the conductive connecting sheet 20 to facilitate welding connection between the conductive connecting sheet 20 and the FPC connecting body 10 .

[0048] S400, welding the conductive connection structure to a preset connection point of the detection board through the connection pad 11 so that the conductive connection sheet 20 is located outside the detection board for electrical connection with the bus bar.

[0049] Specifically, the connecting pad 11 can be welded and fixed to the conductive solder joint on the detection board by soldering or other methods. The detection board is a PCB circuit board. The bus metal bus includes a plurality of aluminum bars, which are used to connect adjacent single battery cells in series. The aluminum bars can usually be connected to the battery cells by aluminum wire welding. The conductive connecting sheet 20 can be welded and fixed to the bus metal bus by laser welding.

[0050] In one embodiment, the connecting ear piece 12 extends outward from the second side of the FPC connecting body 10, and the conductive connecting piece 20 is arranged along the extension direction parallel to the detection board. It can be understood that the state after welding is completed is as follows: Figure 4 As shown, in this embodiment, the connecting ear piece 12 needs to extend above the aluminum bar piece, so that when the conductive connecting piece 20 is welded to the connecting ear piece 12, it is also located above the aluminum bar piece so that the two can be welded and connected.

[0051] In another embodiment, the conductive connecting sheet 20 is arranged along an extension direction perpendicular to the detection board. In this embodiment, the connecting ear piece 12 does not need to extend outward, but extends outward from the second end of the conductive connecting sheet 20 to the top of the aluminum sheet to facilitate the welding connection between the two. In this embodiment, a avoidance groove is usually provided on the portion of the detection board corresponding to the conductive connection structure. The avoidance groove can accommodate a part of the structure of the FPC connection body 10 so that the FPC connection body 10 will not extend above the aluminum sheet. The state after welding is completed is as shown in FIG. Figure 5 As shown; the advantage of this method is that: since the FPC connection body 10 is arranged with conductive circuits, when the connecting ear piece 12 extends outward to the aluminum bar piece, it will inevitably overlap with the aluminum bar piece, and there is a certain risk of leakage. When this embodiment is adopted, the FPC connection body will not overlap with the aluminum bar piece, thereby eliminating the risk of leakage.

[0052] The FPC connection body 10 is used to realize the conductive connection between the detection board and the conductive connecting piece 20. For the convenience of processing, a number of conductive circuits corresponding to the FPC connection body 10 are usually formed on the FPC substrate according to the process flow of the FPC circuit board, and then a punching process is performed to form a number of FPC connection bodies 10 to improve the processing efficiency; the conductive connecting piece 20 can also be pre-stamped and formed, and it serves as an intermediate conductive part to realize the conductive connection between the FPC connection body 10 and the bus metal bar. The setting of the connecting ear piece 12 can facilitate welding connection with the conductive connecting piece 20 to form a conductive connection structure. The setting of the connecting pad 11 facilitates welding connection with the detection board. After the conductive connection structure is welded to the detection board through the connecting pad 11, when assembling the battery pack, the detection board can be assembled to the corresponding position on the battery pack, and the conductive connecting piece 20 can be directly connected to the bus metal bar to realize the conductive connection between the detection board and the bus metal bar.

[0053] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A battery pack detection board conductive connection structure, characterized in that: include: An FPC connection body, a first side of which is provided with a connection pad for electrical connection with the detection board, a second side of which is formed with a connection ear piece, and a conductive circuit is printed on the FPC connection body for realizing electrical signal transmission; The conductive connecting piece has a first end electrically connected to the connecting ear piece and a second end electrically connected to the bus bar.

2. The conductive connection structure of the battery pack detection board according to claim 1, characterized in that: A deformation groove is provided in the FPC connection body between the connection pad and the connection ear piece, and a micro connection structure is formed on one side of the deformation groove.

3. The conductive connection structure of the battery pack detection board according to claim 1 or 2, characterized in that: The conductive connecting piece is also provided with a temperature sensor for collecting temperature information transmitted by the corresponding bus bar.

4. The conductive connection structure of the battery pack detection board according to claim 3, characterized in that: The conductive connecting sheet is provided with a receiving groove for receiving the temperature sensor, and two sides of the receiving groove are symmetrically provided with clamping spring pieces, and the clamping spring pieces are used to clamp and fix the temperature sensor.

5. The conductive connection structure of the battery pack detection board according to claim 4, characterized in that: A welding groove is also provided on the conductive connecting sheet at one side of the accommodating groove.

6. The conductive connection structure of the battery pack detection board according to claim 1, characterized in that: The conductive connecting sheet is arranged along an extension direction perpendicular to the detection board; Alternatively, the connecting ear piece extends outward from the second side of the FPC connecting body, and the conductive connecting piece is arranged along an extending direction parallel to the detection board.

7. A processing technology for a conductive connection structure of a battery pack detection board, characterized in that: include: Forming conductive circuits on the FPC substrate according to a predetermined process flow; Punching the FPC substrate to form an FPC connection body, wherein a connection pad is provided on a first side of the FPC connection body for electrical connection with the detection board, and a connection ear is formed on a second side; The pre-processed conductive connecting piece and the connecting ear piece are welded and fixed to form a conductive connecting structure; The conductive connection structure is welded to a preset connection point of the detection board through a connection pad so that the conductive connection piece is located outside the detection board for electrical connection with the busbar.

8. The processing technology of the conductive connection structure of the battery pack detection board according to claim 7 is characterized in that: When the FPC connection body is formed by punching, a deformation groove is formed between the connection pad and the connection ear piece, and a micro connection structure is formed on one side of the deformation groove.

9. The processing technology of the conductive connection structure of the battery pack detection board according to claim 7, characterized in that: The conductive connecting sheet is formed with a receiving groove, and after the pre-processed conductive connecting sheet and the connecting ear sheet are welded and fixed to form a conductive connecting structure, the method further includes: A temperature sensor is placed in the receiving groove, and the temperature sensor is welded to the FPC connecting body to directly collect temperature information transmitted by the corresponding busbar.

10. The processing technology of the conductive connection structure of the battery pack detection board according to claim 7, characterized in that: A welding groove is also formed on the conductive connecting sheet at one side of the accommodating groove.

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