CN114745847A - A lithium battery flexible circuit board structure - Google Patents

Abstract

The invention relates to a flexible circuit board structure for a lithium battery, which comprises a circuit board body, at least one extension part is provided at the outer edge of the circuit board body, and the extension part is used for installing components, and the extension part is connected to the outer edge of the circuit board body. The plane where the circuit board body is located is staggered and can be installed on the mounting surface of the lithium battery module, so that a buffer gap is formed between the circuit board body and the mounting surface; solving the problem of the circuit board mounted on the lithium battery After the structure is subjected to impact, impact and vibration, there is a risk of breaking and falling off, and the stability of the circuit board structure is poor, resulting in a short service life.

Description

A lithium battery flexible circuit board structure

technical field

The invention relates to the technical field of lithium batteries, in particular to a flexible circuit board structure for lithium batteries.

Background technique

The lithium-ion start-stop battery system is a highly integrated product with electrochemical, electrical and thermal management components. At present, in the process of development of models in the automobile industry, it is necessary to design and develop a lithium-ion battery system without changing the original battery installation compartment structure of the whole vehicle. Among them, during the production process of the lithium battery module, a plurality of battery cell tabs are welded to form a nickel sheet, and a circuit board structure for connecting the nickel sheet to the BMS battery system and other devices needs to be welded on the lithium battery module. In order to realize the control function of lithium battery.

For example, the flexible circuit board assembly, battery module and vehicle proposed in the utility model patent application number CN202020958893.1, wherein the flexible circuit board assembly includes a flexible circuit board and a connector, and the flexible circuit board includes a The first end of the battery module housing and the second end for connecting to the tab bracket located in the battery module housing, and the connector is detachably connected to the first end of the flexible circuit board.

However, there are vibrations and jitters when the whole vehicle is working. The circuit board structure installed on the lithium battery has the risk of breaking and falling off after being hit, impacted and vibrated. The stability of the circuit board structure is poor, so that the service life is relatively short. short.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a lithium battery flexible circuit board structure to solve the risk of breaking and falling off after the circuit board structure mounted on the lithium battery is subjected to impact, impact and vibration, and the stability of the circuit board structure is poor. , resulting in a shorter service life.

The invention provides a lithium battery flexible circuit board structure, comprising a circuit board body, at least one extension part is provided at the outer edge of the circuit board body, the extension part is used to install components, and the extension part is connected to the outer edge of the circuit board body. The plane where the circuit board body is located is staggered and can be mounted on the mounting surface of the lithium battery module, so that a buffer gap is formed between the circuit board body and the mounting surface.

Further, the circuit board body is a flexible circuit board.

Further, the edge of the circuit board body is provided with connection ends corresponding to the extension parts one-to-one, and the circuit board body is connected to the corresponding extension part via the connection ends.

Further, the connecting end and the circuit board body are located in the same plane, one side of the connecting end is fixedly connected with the circuit board body, and the other side of the connecting end is provided with an inclined groove, and the extending The part is fixedly connected with the groove of the connecting end.

Further, the circuit board body and the connection end are integrally formed, and the connection end and the extension portion are welded.

Further, the extension part is a C-shaped board arranged parallel to the circuit board body, and the width of the extension part along the extension direction is the same everywhere.

Further, the extension part includes a support plate and an arc-shaped plate arranged in parallel, one side of the support plate is fixedly connected to the circuit board body, and the other side of the support plate is fixedly connected to the arc-shaped plate , the support plate and the arc plate form a C-shaped plate perpendicular to the direction of the circuit board body, the support plate is mounted with components, the arc plate and the side of the components Abut.

Further, the circuit board body is electrically connected to the extension portion.

Further, the number of the extension parts is multiple, and the multiple extension parts are arranged in sequence along the circumferential direction of the circuit board body to install multiple components.

Further, a plurality of the extension parts are located in the same plane.

Compared with the prior art, by adding the extension part, the components and the circuit board body are dislocated and installed, that is, the components do not need to be installed on the circuit board body, the components can be installed on the extension part, and are connected to the circuit board through the extension part. The main body is electrically connected, and is electrically connected with the lithium battery module through the extension part, so that the relative fixing of the circuit board body and the lithium battery module is realized, and the extension part is arranged to be staggered from the plane where the circuit board body is located, and can be installed On the mounting surface of the lithium battery module, a buffer gap is formed between the circuit board body and the mounting surface on the lithium battery module. When the circuit board body is impacted, impacted and vibrated, the circuit board body will move closer to or away from the buffer gap. The trend of moving in the direction of the battery effectively avoids the hard collision with the lithium battery module, and resets under the action of the extension, and absorbs the external force generated by the above impact, impact and vibration through the extension. After the extension is damaged, It can be directly replaced, which effectively protects the circuit board body, improves the stability of the circuit board body installation, and prolongs the service life.

Description of drawings

1 is a schematic diagram of the overall structure in an embodiment of the structure of a lithium battery flexible circuit board provided by the present invention;

FIG. 2 is a schematic structural diagram of a BMS plug installed on an extension part in an embodiment of the flexible circuit board structure for a lithium battery provided by the present invention.

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

In order to facilitate the understanding of the invention of the present invention, it is necessary to first describe the installation method of the traditional lithium battery circuit board. The existing lithium battery circuit board is installed by opening mounting holes on the circuit board and tightening them with screws. The circuit board is fixed on the lithium battery module by means of parts, and then other components are installed on the circuit board. The circuit board is in hard contact with the lithium battery module, and the circuit board is easily damaged. In order to solve the above problems, the present invention provides a Lithium battery flexible circuit board structure.

As shown in FIG. 1 , a lithium battery flexible circuit board structure in this embodiment includes a circuit board body 100 . At least one extension portion 200 is provided at the outer edge of the circuit board body 100 , and the extension portion 200 is used for mounting components. 300, the extension portion 200 and the plane of the circuit board body 100 are staggered and can be mounted on the mounting surface of the lithium battery module, so as to form a buffer gap between the circuit board body 100 and the mounting surface.

Wherein, the components 300 and the circuit board body 100 are dislocated by adding the extension part 200 , that is, the components 300 do not need to be installed on the circuit board body 100 , and the components 300 can be installed on the extension part 200 and pass through the extension part 200 . It is electrically connected to the circuit board body 100, and is electrically connected to the lithium battery module through the extension portion 200, so as to realize the relative fixation of the circuit board body 100 and the lithium battery module. It is staggered and can be installed on the mounting surface of the lithium battery module. A buffer gap is formed between the circuit board body 100 and the mounting surface on the lithium battery module. When the circuit board body 100 is impacted, impacted and vibrated, the circuit board The main body 100 tends to move toward or away from the buffer gap, effectively avoiding the hard collision with the lithium battery module, and is reset under the action of the extension The external force generated by the vibration can be directly replaced after the extension part 200 is damaged, which effectively protects the circuit board body 100 , improves the installation stability of the circuit board body 100 , and prolongs the service life.

The circuit board body 100 in this embodiment is a structure mounted on the lithium battery module, and can be connected with the components 300 to play an intermediate conversion role.

In order to improve the impact resistance of the circuit board body 100, in a preferred embodiment, the circuit board body 100 is a flexible circuit board. The flexible circuit board itself has good toughness, which can make it have a certain impact resistance.

The traditional components 300 are all mounted on the circuit board, the components 300 in the embodiment of the present invention are staggered and installed with the circuit board body 100, more components 300 can be installed, and the integration degree is high. The extension 200 provided at the edge of the body 100 realizes the above functions.

In order to facilitate the connection between the circuit board body 100 and the extension part 200 , the edge of the circuit board body 100 in the embodiment of the present invention is provided with a connection end 110 corresponding to the extension part 200 one-to-one, and the circuit board body 100 passes through the connection end 110 is connected with the corresponding extension part 200 .

In a preferred embodiment, the connecting end 110 and the circuit board body 100 are located in the same plane, one side of the connecting end 110 is fixedly connected with the circuit board body 100, and the other side of the connecting end 110 is provided with an inclined groove 120, The extension portion 200 is fixedly connected to the groove 120 of the connecting end 110 . By arranging the inclined groove 120 , the extension portion 200 for easy connection and the plane of the circuit board body 100 are arranged staggered, and at the same time, the connection work between the connection end 110 and the extension portion 200 is also facilitated.

It should be noted that, in the embodiment of the present invention, the circuit board body 100 and the connection end 110 are integrally formed, the connection end 110 and the extension part 200 are welded, and the circuit board body 100 and the extension part 200 are electrically connected.

Of course, in other preferred embodiments, the connection relationship between the circuit board body 100 and the extension portion 200 is not limited, as long as the two are electrically connected and the aforementioned buffer gap is formed.

In this embodiment, the extension portion 200 is electrically connected to the circuit board body 100 , and the components 300 mounted on the extension portion 200 can be electrically connected to the circuit board body 100 . At the same time, the extension portion 200 is provided with a shock-absorbing device instead of the circuit board body 100 . function to protect the circuit board body 100, the extension part 200 forms a buffer gap between the circuit board body 100 and the mounting surface, avoids the hard contact between the circuit board body 100 and the lithium battery module, and improves the circuit board body 100. cooling capacity.

In some embodiments, the shape and size of the extension 200 should be determined according to the components 300 to be mounted thereon.

As shown in FIG. 2 , in a preferred embodiment, the BMS plug 310 is installed on the extension part 200 . Due to the large volume of the BMS plug 310 , the extension part 200 includes a supporting plate 210 and an arc-shaped plate 220 arranged in parallel. One side of the board 210 is fixedly connected with the circuit board body 100 , and the other side of the support board 210 is fixedly connected with the arc board 220 . The support board 210 and the arc board 220 form a C-shaped board perpendicular to the direction of the circuit board body 100 . , the component 300 is mounted on the support plate 210 , the arc-shaped plate 220 has an abutting end 230 , and the abutting end 230 abuts the side of the component 300 . The support plate 210 plays the role of connecting the BMS plug 310 and the circuit board body 100 , and at the same time, the arc plate 220 abuts against the BMS plug 310 , which can prevent the BMS plug 310 from being displaced relative to the support plate 210 , and the pins are not easily inserted into the BMS plug 310 .

In another preferred embodiment, the extension portion 200 is provided with a lithium battery module nickel sheet 320 . Since the lithium battery module nickel sheet 320 is small in size, the extension portion 200 is a C-shaped plate arranged parallel to the circuit board body 100 . , the width of the extending portion 200 along its extending direction is the same everywhere. By arranging the extension portion 200 of the C-shaped plate, its lateral and longitudinal bending resistance can be improved.

In yet another preferred embodiment, the extension portion 200 is provided with a temperature sensor nickel sheet 330. Since the nickel sheet 320 of the lithium battery module is small in size, the extension portion 200 is a C-shaped plate arranged parallel to the circuit board body 100, extending The width of the portion 200 in the extending direction thereof is the same everywhere. By arranging the extension portion 200 of the C-shaped plate, its lateral and longitudinal bending resistance can be improved.

Similarly, when installing other types of components 300 , the shape and size of the extension portion 200 should be determined according to the shape and size of the component 300 .

In some embodiments, the number of the extension parts 200 is determined according to the number of the components 300 to be installed. For example, the number of components 300 to be mounted is multiple, the number of extension parts 200 is multiple, and the multiple extension parts 200 are sequentially arranged along the circumferential direction of the circuit board body 100 for mounting multiple components 300 . The plurality of extension portions 200 are located in the same plane, so that a buffer gap of the same thickness can be formed between the circuit board body 100 and the mounting surface. Of course, in some other embodiments, the plurality of extension parts 200 may not be disposed in the same plane.

Compared with the prior art, the components 300 and the circuit board body 100 are installed in a dislocation through the increased extension portion 200 , that is, the components 300 do not need to be installed on the circuit board body 100 , and the components 300 can be installed on the extension portion 200 . It is electrically connected to the circuit board body 100 through the extension portion 200, and is electrically connected to the lithium battery module through the extension portion 200, so that the circuit board body 100 and the lithium battery module are relatively fixed, and the extension portion 200 is provided with the circuit board. The plane where the body 100 is located is staggered and can be installed on the mounting surface of the lithium battery module. A buffer gap is formed between the circuit board body 100 and the mounting surface on the lithium battery module. When the circuit board body 100 is hit or impacted And after the vibration, the circuit board body 100 tends to move toward or away from the buffer gap, which effectively avoids the hard collision with the lithium battery module, and resets under the action of the extension 200. The external force generated by the above impact, impact and vibration is absorbed, and the extension part can be replaced directly after damage, which effectively protects the circuit board body 100, improves the installation stability of the circuit board body 100, and prolongs the service life.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

Claims (10)

1. A lithium battery flexible circuit board structure, characterized in that it includes a circuit board body, and at least one extension portion is provided at the outer edge of the circuit board body, and the extension portion is used to install components, and the extension portion It is staggered from the plane where the circuit board body is located, and can be mounted on the mounting surface of the lithium battery module, so that a buffer gap is formed between the circuit board body and the mounting surface. 2 . The flexible circuit board structure for lithium batteries according to claim 1 , wherein the circuit board body is a flexible circuit board. 3 . 3 . The flexible circuit board structure for lithium batteries according to claim 1 , wherein the edge of the circuit board body is provided with connecting ends corresponding to the extension parts one-to-one, and the circuit board body passes through the connecting ends. 4 . Connect with the corresponding extension. 4 . The flexible circuit board structure of a lithium battery according to claim 3 , wherein the connecting end and the circuit board body are located in the same plane, and one side of the connecting end is fixedly connected to the circuit board body, 4 . The other side of the connecting end is provided with an inclined groove, and the extending portion is fixedly connected with the groove of the connecting end. 5 . The flexible circuit board structure for a lithium battery according to claim 4 , wherein the circuit board body and the connection end are integrally formed, and the connection end and the extension portion are welded. 6 . 6 . The flexible circuit board structure for lithium batteries according to claim 1 , wherein the extension part is a C-shaped board arranged parallel to the circuit board body, and the width of the extension part along the extension direction is the same everywhere. 7 . . 7 . The flexible circuit board structure for lithium batteries according to claim 1 , wherein the extension part comprises a supporting plate and an arc-shaped plate arranged in parallel, and one side of the supporting plate is fixedly connected to the circuit board body. 8 . , the other side of the support plate is fixedly connected with the arc-shaped plate, the support plate and the arc-shaped plate form a C-shaped plate perpendicular to the direction of the circuit board body, and the support plate is installed There are components, and the arc-shaped plates are in contact with the side parts of the components. 8 . The flexible circuit board structure for lithium batteries according to claim 1 , wherein the circuit board body is electrically connected to the extension portion. 9 . 9 . The flexible circuit board structure of a lithium battery according to claim 1 , wherein the number of the extension parts is plural, and the plurality of the extension parts are arranged in sequence along the circumferential direction of the circuit board body for installation. 10 . multiple components. 10 . The flexible circuit board structure for lithium batteries according to claim 9 , wherein a plurality of the extension parts are located in the same plane. 11 .

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