CN211352616U

CN211352616U - Integrated FPC-PCB assembly, vehicle power battery and vehicle

Info

Publication number: CN211352616U
Application number: CN201922197925.0U
Authority: CN
Inventors: 杨涛; 李军亮; 沈姣姣; 陆扬
Original assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Current assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-08-25
Anticipated expiration: 2029-12-10

Abstract

The utility model provides an integrated form FPC-PCB assembly, vehicle power battery and vehicle, wherein, integrated form FPC-PCB assembly includes FPC body, PCB body, FPC interface, PCB interface, connection piece, the FPC interface is located on the FPC body, the PCB interface is located on the PCB body, the FPC interface with PCB interface connection, the connection piece is fixed on the FPC body, and the connection piece is used for connecting vehicle power battery's electric core utmost point post. The utility model discloses an useful part includes: the connector is eliminated, the connection strength is improved, the connection reliability is improved, the height space is reduced, and the cost can be saved.

Description

Integrated FPC-PCB assembly, vehicle power battery and vehicle

Technical Field

The utility model relates to an integrated form FPC-PCB assembly, vehicle power battery and vehicle, integrated form FPC-PCB assembly is used in power battery management system.

Background

When a sampling loop is designed, a current power battery management system mostly adopts a wire harness to acquire sensor data such as cell voltage/temperature and the like, and is connected with a controller through a connector (refer to fig. 7, which shows a schematic diagram of a connection mode of an existing connector, and a black part in fig. 7 is a connector).

With the increase of the number of battery cells of the battery pack, wiring is difficult to be neat and uniform by adopting a mode of collecting wiring harness and plug-in units, limited battery pack space needs to be compressed for wiring, assembly needs to be completed manually to a great extent, and automatic/integrated production is difficult to realize; adopt the connector to accomplish sealed design very difficultly, the connector occupies high space great, is unfavorable for the optimal design in battery package space. The problems caused by the connector are higher in the after-sale problems of the whole battery management system, the connector is easy to corrode, crack, contact failure and the like, and the driving safety is influenced in serious cases.

Along with the rising of battery package voltage platform, the module quantity is more and more in the single battery package, and the cost pressure that is brought by connector quantity and pencil length increase is bigger and bigger, and the pencil installation need increase extra human cost, is unfavorable for the trend that the battery package developed to low-cost direction.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is how to overcome the traditional pencil of the sampling return circuit in the power battery management system and add the mode wiring that the plug connector gathered with assembly difficulty, plug connector be difficult to accomplish sealed design, account for high space big, the plug connector is perishable, the cost pressure big scheduling problem that fracture, contact failure and plug connector quantity and pencil length brought.

Furthermore, the present invention also aims to solve or alleviate other technical problems existing in the prior art.

The utility model provides an above-mentioned problem is solved to integrated form FPC-PCB assembly, particularly, according to the utility model discloses an aspect provides:

the integrated FPC-PCB assembly comprises an FPC body, a PCB body, an FPC interface, a PCB interface and connecting pieces, wherein the FPC interface is positioned on the FPC body, the PCB interface is positioned on the PCB body, the FPC interface is connected with the PCB interface, the connecting pieces are fixed on the FPC body, and the connecting pieces are used for connecting electric core poles of a vehicle power battery.

Optionally, according to an embodiment of the present invention, the FPC body further comprises a thermistor fixed to the FPC body.

Optionally, according to an embodiment of the present invention, the FPC connector further includes a reinforcing plate, the reinforcing plate is configured at a connection portion of the FPC connector and the PCB connector, and/or a fixing portion of the thermistor and the FPC body.

Optionally, according to an embodiment of the present invention, the FPC further comprises an adhesive, the adhesive is applied to the connection portion of the FPC interface and the PCB interface, the connection piece and the fixing portion of the FPC body, and/or the thermistor and the fixing portion of the FPC body.

Optionally, according to the utility model discloses an embodiment, the FPC body with the PCB body reserves the pad separately and carries out welded connection through the pad of reserving, and the back is undetachable as the assembly.

Optionally, according to the utility model discloses an embodiment, the pad of PCB body is double via hole pad, and first row of pad passes through PCB with the second row of pad and walks the line intercommunication, and/or the pad of FPC body is double surface bonding pad, and first row of pad passes through FPC with the second row of pad and walks the line intercommunication.

Optionally, according to the utility model discloses an embodiment, the FPC interface with PCB interface welded connection to the welding mode is reflow soldering.

Optionally, according to the utility model discloses an embodiment, the connection piece with FPC body welded connection, and the straightness that hangs down of connection piece and FPC body is less than 2.

According to another aspect of the present invention, the utility model provides a vehicle power battery, its management system's sampling loop has above any kind of integrated form FPC-PCB assembly.

According to the utility model discloses a still another aspect, the utility model provides a vehicle, it includes foretell vehicle power battery.

The integrated FPC-PCB assembly provided benefits include: the traditional connector connection is cancelled, and the connector is connected in a welding mode, so that the connection strength is improved, the connection reliability is improved, the height space is reduced, and the connector cost is saved.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

FIG. 1 is a schematic view of an integrated FPC-PCB assembly connected by soldering;

FIG. 2 is an exploded view of the integrated FPC-PCB assembly of the present invention;

fig. 3 is a schematic view of a welding interface of the present invention;

fig. 4 and 5 are schematic views of the connection structure of the connection piece of the present invention;

FIG. 6 is a schematic view of the connection position between the connection piece and the FPC body;

fig. 7 is a schematic view of a conventional connector connection method.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a person skilled in the art can propose various alternative structural modes and implementation modes without changing the essential spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.

Refer to fig. 2, which is a schematic diagram illustrating a specific structure of an integrated fpc (flex Printed circuit) -pcb (Printed circuit board) assembly according to the present invention. The integrated FPC-PCB assembly comprises an FPC body 1, 2, a PCB body 3,

FPC interfaces

11, 21,

PCB interfaces

31, 32, connecting

pieces

12, 13, 22, 23,

thermistors

14 and 24, wherein the FPC interface 11 is positioned on the FPC body 1, the FPC interface 21 is positioned on the FPC body 2, the

PCB interfaces

31 and 32 are positioned on the PCB body 3, the FPC interface 11 is connected with the PCB interface 31, the FPC interface 21 is connected with the PCB interface 32, the connecting

pieces

12, 13 and thermistors 14 are fixed on the FPC body 1, the connecting

pieces

22, 23 and the thermistors 24 are fixed on the FPC body 2, and the connecting

pieces

12, 13, 22 and 23 are used for connecting electric core poles of a vehicle power battery. The FPC body has tow sides, optionally, thermistor fixes on the front of FPC body, thermistor can very conveniently welded fastening on the FPC body, and can gather the temperature in the battery package to handle the controller that transmits temperature signal for the PCB body through the FPC body. The thermistor need not be present and other similar means can be used to sense the temperature within the battery pack.

In the embodiment according to fig. 2, the connection tabs 12, the connection tabs 13 and the thermistor 14 are first fixed to the FPC body 1, and the fixing position can be reinforced by constructing a reinforcing plate 15 at the fixing position of the thermistor 14 and the FPC body 1, and the reinforcing plate 15 can be constructed on the back surface of the FPC body 1 corresponding to the fixing position of the thermistor for reinforcing the rigidity of the position where the thermistor is located, avoiding resistance desoldering. Then, the connection tabs 22, the connection tabs 23, and the thermistor 24 are fixed to the FPC body 2, and the fixing position can be reinforced by constructing a reinforcing plate 25 at the fixing position of the thermistor 24 and the FPC body 2, and the reinforcing plate 25 can be constructed on the back surface of the FPC body 2 where the thermistor 24 is fixed. Then, the FPC interface 11 is connected to the PCB interface 31, so that the FPC body 1 and the PCB body 3 to which the connection pieces 12, the connection pieces 13, the thermistor 14, and the reinforcing plate 15 have been mounted are connected to each other by the connection of the FPC interface 11 to the PCB interface 31, and the FPC interface 21 is connected to the PCB interface 32, so that the FPC body 2 and the PCB body 3 to which the connection pieces 22, the connection pieces 23, the thermistor 24, and the reinforcing plate 25 have been mounted are connected to each other by the connection of the FPC interface 21 to the PCB interface 32. Finally, a reinforcing plate can be constructed at the joints of the FPC interface 11 and the PCB interface 31, the FPC interface 21 and the PCB interface 32 for reinforcing the connection between the FPC interface and the PCB interface, the reinforcing plate can be constructed at the back of the corresponding FPC body at the joints, and an adhesive is applied at the joint of the FPC interface and the PCB interface, the fixing part of the connecting sheet and the FPC body, and/or the fixing part of the thermistor and the FPC body for reinforcing, sealing and protecting the connection and fixing, referring to fig. 1, which shows a schematic diagram of an integrated FPC-PCB assembly assembled by the above method.

It should be understood that the FPC body may comprise a plurality of FPC bodies, for example two in the embodiment according to fig. 2, and optionally, the FPC body 1 is fixed to a battery module ICB (Inner-connection board) with one end connected to the connection pads and one end connected to the PCB body 3. Optionally, the FPC body 2 is fixed to the battery module ICB, and has one end connected to the connecting sheet and the other end connected to the PCB body 3. Optionally, the PCB body 3 is fixed on the battery module ICB, and is connected to the FPC body 1 and the FPC body 2, respectively. Each FPC body can have one FPC interface thereon, and the two PCB interfaces arranged on the PCB body correspond to the FPC interfaces on the two FPC bodies, respectively, in the embodiment according to fig. 2, the FPC interface 11 corresponds to the PCB interface 31, and the FPC interface 21 corresponds to the PCB interface 32. Two PCB interfaces can be arranged respectively on adjacent or relative edge of PCB body, and every FPC interface is connected with corresponding PCB interface.

Referring to fig. 3, it is a schematic diagram of the welding interface of the present invention. The FPC body and the PCB body can reserve bonding pads respectively and are connected in a welding mode through the reserved bonding pads, and the FPC body and the PCB body are not detachable as an assembly after welding. The welding mode is reflow welding, for example, the bubble amount of the welding position after welding can meet less than 35% of the welding area, no welding tin residue can exist between the welding pad and the welding pad, the pulling force of the welding position can be not less than 125N, and/or the peeling force can be not less than 100N. The pad of PCB body is double via hole pad, and first row of pad is walked the line intercommunication through PCB with the second row of pad, first row of via hole is located PCB body edge, for example for the semicircle orifice, and the hole interval is not less than 2.4mm, the second row of via hole is for example the round hole, and the hole interval equals with first row of via hole, and the distance of two rows of via holes is the same with the hole interval. The aperture of the via hole is not less than 0.9mm, the diameter of the pad is at least 0.5mm larger than the aperture, and the hole spacing is at least 1mm larger than the diameter of the pad. The bonding pads of the FPC body are double rows of surface bonding pads, and the first row of bonding pads are communicated with the second row of bonding pads through FPC wiring. The center distance of the bonding pads is the same as the hole distance, and the diameter of the surface bonding pad is equal to that of the through hole bonding pad. It should be noted that the connection manner of the FPC interface and the PCB interface is not limited to soldering, and may be replaced by other connection manners having similar fixing connection effects, such as snap connection, screw connection, adhesion, and the like.

It should be understood that the FPC interface can be constituted by pads on the FPC body, the number of pads being defined in terms of the number of samples. The PCB interface can be formed by pads on the PCB body, and the number of the pads is defined according to the sampling number.

The PCB interface and the FPC interface meet the following two requirements:

1. stable electrical connection performance. Compared with the traditional connector in a mode of connecting through a Pin needle, the PCB body and the FPC body are connected in a welding mode through a reserved welding disc, failure modes such as missing welding, insufficient welding and short circuit cannot exist at an interface part, stable and reliable electric conduction is guaranteed, and a sampling signal is transmitted to a controller in real time without distortion;

2. reliable mechanical strength. The design is applied to a power battery pack, the environment is complex, the safety level is high, the requirements of safety and reliability in the service life of the whole vehicle are met, and the designed interface passes the verification of various working conditions such as vibration, durability, cold and hot circulation, temperature and humidity circulation, salt spray corrosion and the like.

Refer to fig. 4 and 5, which are schematic views of the connection structure of the connection piece of the present invention. The connecting plates are made of nickel, for example, and the use of nickel for the connecting plates has the advantage that the nickel plates are easier to weld with the aluminum plates of the battery tabs and that the nickel costs are lower. And the battery core pole of the vehicle power battery is connected with the FPC body through the connecting sheet. The overlapped area of the connecting sheet and the FPC body is not less than 8 × 8mm²And the distance between the connecting piece and the edge of the FPC body is not less than 2 mm. The FPC body where the connection tab is located can be designed as a protrusion (refer to fig. 6, which is a schematic view of the connection portion of the connection tab and the FPC body of the present invention), which is in the shape of a small arm, such as the portion circled by the dotted line in fig. 6. The edge of the tab is spaced apart from the rest of the FPC body. After the connecting sheet is welded with the battery core pole of the power battery, the corresponding FPC body can generate certain relative deformation relative to the connecting sheet, and stress generated by the battery core during expansion can be offset. The connecting piece can be fixed at the FPC body through welding, and the perpendicularity of the connecting piece and the FPC body is smaller than 2 degrees. Optionally, the connection piece can be a plurality of, and it contains two kinds of connection pieces, and one kind of connection piece one end welds on the FPC body, and one end welds with power battery's electric core utmost point post. The thermistor is arranged in a protective structure formed at the connection pad. One end of the other connecting sheet is welded on the FPC body, and the other end of the connecting sheet is welded with the battery cell pole.

It should be understood that the adhesive can be, for example, glue, and that different adhesives can be employed for application at different locations. The adhesive applied to the connecting position of the FPC body and the PCB body is used for reinforcing the connection of the FPC interface and the PCB interface, preventing the welding position from forming shear stress, and simultaneously playing the functions of sealing, preventing water and dust and preventing corrosion to welding spots. The adhesive is capable of meeting flame retardant requirements of at least a UL94V-0 rating. The adhesive applied to the fixing position of the thermistor and the FPC body is used for reinforcing the thermistor, preventing the thermistor from being desoldered, and simultaneously playing the functions of sealing, preventing water and dust and preventing corrosion on welding spots. The adhesive used to apply the adhesive at the attachment of the thermistor and FPC body can be a thermally conductive glue.

It should be understood that the integrated FPC-PCB assembly of the present invention can be used in the sampling loop of the management system of a vehicle power battery that can be installed on various vehicles, including various hybrid vehicles or pure electric vehicles. Accordingly, the subject matter of the present invention is also directed to protecting a vehicle power battery equipped with the integrated FPC-PCB assembly of the present invention and various vehicles equipped with such a vehicle power battery.

To sum up, first, the conventional wire harness is replaced with the FPC. FPC compares pencil overall arrangement regular, compact structure, does benefit to and integrates, automatic assembly production, has a great deal of advantages such as ultra-thin thickness, super compliance, lightweight, and occupation space is little, does benefit to design into various shapes based on different modules, is particularly suitable for replacing traditional sampling pencil. The integrated assembly scheme of adopting FPC and PCB to joint has again compensated the FPC board through the PCB board and is unfavorable for extensive subsides dress components and parts, leads to the shortcoming of pad fracture easily, has practiced thrift manufacturing cost, and in addition, the PCB board conveniently is 4 plywoods, and only does 4 plywoods with FPC and then can improve the cost greatly.

Secondly, the connection of the FPC and the controller circuit board PCB cancels a connector, a soft and hard board integrated connection scheme based on the FPC and the PCB is designed, and the height space and the cost are effectively reduced by optimally designing a connection interface of the FPC and the PCB, for example, the FPC-PCB integrated connection is carried out in a welding mode.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which may occur to those skilled in the art upon reading the teachings of the present invention, are intended to be within the scope of the appended claims.

Claims

1. The integrated FPC-PCB assembly is characterized by comprising an FPC body, a PCB body, an FPC interface, a PCB interface and connecting pieces, wherein the FPC interface is positioned on the FPC body, the PCB interface is positioned on the PCB body, the FPC interface is connected with the PCB interface, the connecting pieces are fixed on the FPC body, and the connecting pieces are used for connecting electric core poles of a vehicle power battery.

2. The integrated FPC-PCB assembly of claim 1, further having a thermistor fixed to the FPC body.

3. The integrated FPC-PCB assembly according to claim 2, further having a reinforcing plate configured at a connection portion of the FPC interface and the PCB interface and/or a fixing portion of the thermistor and the FPC body.

4. The integrated FPC-PCB assembly of claim 2, further having an adhesive applied at a connection site of the FPC interface and PCB interface, a fixing site of the connection tab and the FPC body, and/or a fixing site of the thermistor and the FPC body.

5. The integrated FPC-PCB assembly of claim 1 or 2, wherein the FPC body and the PCB body reserve bonding pads and are connected by soldering, and are not detachable as an assembly after soldering.

6. The integrated FPC-PCB assembly of claim 5, wherein the pads of the PCB body are dual row via pads, the first row of pads being in communication with the second row of pads through PCB traces, and/or the pads of the FPC body are dual row surface pads, the first row of pads being in communication with the second row of pads through FPC traces.

7. The integrated FPC-PCB assembly of claim 1 or 2, wherein the FPC interface is solder connected to the PCB interface and the soldering is reflow soldering.

8. The integrated FPC-PCB assembly of claim 1 or 2, wherein the connection tab is solder-connected to the FPC body and the connection tab is less than 2 ° perpendicular to the FPC body.

9. A vehicle power cell, characterized in that the sampling circuit of the management system of the vehicle power cell has an integrated FPC-PCB assembly according to any one of claims 1 to 8.

10. A vehicle characterized in that the vehicle includes the vehicle power battery according to claim 9.