CN217933196U

CN217933196U - Flexible flat wire, battery management system and battery pack

Info

Publication number: CN217933196U
Application number: CN202221327638.2U
Authority: CN
Inventors: 赵锡鹏
Original assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Current assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-11-29
Anticipated expiration: 2032-05-30

Abstract

The application relates to a flexible flat wire, battery management system and battery package, flexible flat wire includes: a lower insulator; an upper insulator connected with the lower insulator; the flat conductor is arranged between the lower insulator and the upper insulator, a fusing part is arranged on the conductor, the conductor and the fusing part are both made of metal materials, and the melting point of the fusing part is lower than that of the conductor; when the electric conductor is heated abnormally, the fusing part and the electric conductor mutually permeate to form an alloy. Above-mentioned flexible flat line because the everywhere position of electric conductor does not all have the breach to the structural strength of electric conductor can only be strengthened to the fusing part when setting up on the surface of electric conductor, consequently at the in-process of preparation flexible flat line, the electric conductor is difficult because of there being the weak position in the structure and by the physics rupture, has avoided the electric conductor because of the unusual impaired unable normal use by.

Description

Flexible flat wire, battery management system and battery pack

Technical Field

The application relates to the technical field of battery packs, in particular to a flexible flat wire, a battery management system and a battery pack.

Background

A Flexible Flat Cable (FFC) is a Cable for transmitting data, and has the advantages of flexibility, random bending and folding, thin thickness, small volume, simple connection, convenient disassembly, easy solution to electromagnetic shielding, and the like.

In the prior art, a flexible flat wire usually includes an insulator and a plurality of conductors arranged in the insulator in parallel and at intervals, the conductors are in the shape of strips with equal width, and the areas of the cross sections along the extending direction of the conductors are all equal, so that the resistance values of all the conductors are all equal. When the circuit where the flexible flat wire is located is short-circuited or overloaded, the heating values of all the positions of the electric conductor are the same, and the electric conductor is difficult to realize local fusing, so that the electric conductor does not have the fusing protection function. Especially, when the flexible flat wire is applied to a lithium battery management system of a new energy automobile, if the flexible flat wire does not have a fusing protection function, the battery pack which is overheated and out of control cannot be cut off in time, and the lithium battery management system of the new energy automobile cannot be protected better.

For this reason, the conductor of the flexible flat wire in the prior art is usually provided with a notch at a certain position to reduce the cross-sectional area at the position and increase the current passing through the position, so that the conductor is easily fused at the position. However, in the process of manufacturing the flexible flat wire, the position of the conductor provided with the notch is easily physically broken, so that the conductor cannot be normally used.

SUMMERY OF THE UTILITY MODEL

Based on this, the application provides a flexible flat wire, a battery management system and a battery pack to improve the problem that the electric conductor of the flexible flat wire is easily physically broken in the preparation process in the prior art.

In a first aspect, the present application provides a flexible flat wire comprising:

a lower insulator;

an upper insulator connected with the lower insulator; and

a flat conductor provided between the lower insulator and the upper insulator, and having a fuse portion provided thereon, the conductor and the fuse portion being made of a metal material, and the fuse portion having a melting point lower than that of the conductor;

when the electric conductor is heated abnormally, the fusing part and the electric conductor mutually permeate to form an alloy.

In one embodiment, the electric conductor is a rectangular strip of aluminum foil, a rectangular strip of copper foil or a rectangular strip of silver foil.

In one embodiment, the fusing part is a tin bead, and the fusing part is welded and fixed on the surface of the conductor or embedded in the conductor.

In one embodiment, the fusing part is disposed on an upper side and a lower side of the conductor, the upper side of the conductor is adjacent to the upper insulator, and the lower side of the conductor is adjacent to the lower insulator.

In one embodiment, the conductors are arranged in parallel and at intervals, and the fusing part is arranged on each conductor.

In one embodiment, the interval between two adjacent electric conductors is 0.5mm, 0.8mm, 1.0mm, 1.25mm, 1.27mm, 1.5mm, 2.0mm or 2.54mm.

In one embodiment, the upper insulator and/or the lower insulator are made of polyethylene terephthalate, polyvinyl chloride or polyimide materials.

In one embodiment, the upper insulator and the lower insulator are both in the shape of a film, and the upper insulator and the lower insulator are pressed together with the conductor to form the flexible flat wire.

In a second aspect, the present application provides a battery management system comprising any one of the flexible flat wires provided herein, wherein the flexible flat wire is used for data transmission in the battery management system.

In a third aspect, the present application provides a battery pack, where the battery pack includes any one of the battery management systems provided by the present application.

Above-mentioned flexible flat line, because the position of electric conductor does not all have the breach to the structural strength of electric conductor only can be strengthened to the fuse part when setting up on the surface of electric conductor, consequently at the in-process of preparation flexible flat line, the electric conductor is difficult because of there being the structural weak position by the physics rupture, has avoided the electric conductor because of the unusual impaired unable normal use.

Drawings

FIG. 1 is a schematic structural diagram of a flexible flat wire according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a fuse portion of a flexible flat wire embedded in a conductive body according to an embodiment of the present application;

FIG. 3 is a schematic view of a fuse portion of a flexible flat wire embedded in an electrical conductor according to yet another embodiment of the present application;

FIG. 4 is a schematic view of a fuse portion of a flexible flat wire embedded in a conductive body according to yet another embodiment of the present application.

Reference numerals: 1. a lower insulator; 2. an upper insulator; 3. an electrical conductor; 4. and a fusing part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the illustration provided in the present embodiment is only to illustrate the basic idea of the present invention in a schematic way.

The structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any structural modification, proportion relation change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention.

References in this specification to "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential", etc., indicate orientations and positional relationships based on those shown in the drawings, and are for convenience only to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present application will be described in detail with reference to specific examples.

Example one

As shown in fig. 1, the present embodiment provides a flexible flat wire including:

a lower insulator 1;

an upper insulator 2 connected to the lower insulator 1; and

a flat conductor 3 disposed between the lower insulator 1 and the upper insulator 2, and provided with a fuse 4 on the conductor 3, the conductor 3 and the fuse 4 being made of metal materials, and the fuse 4 having a melting point lower than that of the conductor 3;

wherein, when the conductor 3 is abnormally heated, the fusing part 4 and the conductor 3 mutually infiltrate to form an alloy.

In the present embodiment, it is exemplarily explained that the conductive body 3 is used for performing connection of a circuit to realize transmission of data. The electric conductor 3 is flat, so that the overall thickness of the flexible flat wire can be reduced, and the characteristic that the flexible flat wire is extremely thin is met. The upper insulator 2 and the lower insulator 1 are respectively arranged at two sides of the electric conductor 3 to seal the electric conductor 3, so that the electric leakage phenomenon caused by the exposure of the electric conductor is avoided; and the upper insulator 2 is connected with the lower insulator 1 to fix the conductive body 3. At the same time, the fusing part 4 is provided on the surface of the conductor 3 and fixed together.

When the circuit where the conductor 3 is located is short-circuited or overloaded, the conductor 3 is abnormally heated due to rapid increase of current, and because the melting point of the fusing part 4 is low, when the current exceeds the maximum load current of the fusing part 4, the fusing part 4 is firstly melted due to heating, and is mutually permeated with the conductor 3 by utilizing the metallurgical effect to form an alloy with a lower melting point, so that the conductor 3 is rapidly fused at the position where the fusing part 4 is located, the purpose of enabling the conductor 3 to have a fusing function is further achieved, and the circuit is effectively protected.

It can be understood that, because the position of the electric conductor 3 does not have a notch, and the fusing part 4 is arranged on the surface of the electric conductor 3, and the structural strength of the electric conductor 3 is only enhanced, the electric conductor 3 is not easily physically broken due to the existence of the structural weak position in the process of preparing the flexible flat wire, and the electric conductor 3 is prevented from being abnormally damaged and cannot be normally used.

As shown in fig. 1, the conductor 3 is specifically a rectangular strip of aluminum foil, a rectangular strip of copper foil, or a rectangular strip of silver foil.

In the present embodiment, it is exemplarily explained that the material of the electric conductor 3 may be specifically any one of aluminum, copper, and silver, and it may be specifically prepared as a flat rectangular strip using a silver foil, a copper foil, or a silver foil. In this embodiment, the copper conductor 3 will be described as an example. It is understood that the above-mentioned metal materials can make the conductive body 3 have excellent conductive performance, so as to facilitate stable data transmission.

As shown in fig. 1, specifically, the fusing part 4 is a tin bead, and the fusing part 4 is fixed by soldering on the surface of the conductor 3.

In the present embodiment, it is exemplarily explained that the fusing part 4 may be formed by soldering a tin bar on the electric conductor 3. When the tin bar is soldered to the conductor 3, the molten tin is collected in a droplet form on the surface of the conductor 3, and the tin bead is formed after cooling, and the tin bead adheres to the surface of the conductor 3 to be fixed. The shape of the tin bead is not particularly limited, and may be specifically a circle, a polygon, an irregular shape, or the like.

It can be understood that since tin is a metal material having a low melting point, it is easy to solder and fix it to the conductor 3, and the requirement that the melting point of the fusing portion 4 is lower than that of the conductor 3 can be satisfied; at the same time, the melting point of the alloy formed by the fusing part 4 and the conductor 3 is lower due to the metallurgical effect, so that the conductor 3 is fused at a lower temperature.

In other embodiments, as shown in fig. 2-4, the fuse portion 4 may also be embedded within the electrical conductor 3. Specifically, a placing groove for placing the fusing part 4 may be provided on the surface of the conductive body 3, the placing groove may be provided as a sunken groove, and the placing groove of the sunken groove structure may be provided only on one side in the thickness direction of the conductive body 3, or may be provided on both sides in the thickness direction of the conductive body 3. Of course, in other embodiments, the placing groove may also be provided as a through groove, i.e. the placing groove is provided through the electrical conductor 3. In the above embodiment, the fusing part 4 may be welded and fixed in the placement groove, or may be embedded in the placement groove. It is to be understood that, in the above embodiment, since the fuse 4 fills the placement groove of the conductor 3, the structural strength of the conductor 3 is still relatively high, and it is still not easily physically broken.

As shown in fig. 1, specifically, the fusing part 4 is provided on the upper and lower sides of the conductor 3, the upper side of the conductor 3 being close to the upper insulator 2, and the lower side of the conductor 3 being close to the lower insulator 1.

In the present embodiment, the upper and lower sides of the conductor 3, i.e., both sides in the thickness direction of the conductor 3, are in contact with the upper insulator 2 and the lower insulator 1, respectively. It can be understood that, by providing the fusing parts 4 on the upper and lower sides of the conductor 3, both the fusing parts 4 can be melted at a high temperature and alloyed with both the upper and lower sides of the conductor 3, so as to accelerate the fusing speed of the conductor 3.

As shown in fig. 1, specifically, the conductors 3 are arranged in parallel and at intervals, and each conductor 3 is provided with a fusing portion 4.

In the present embodiment, it is exemplarily illustrated that seven conductors 3 are arranged in parallel and at intervals, and a fusing portion 4 is arranged on each of the upper and lower sides of each conductor 3, so that the seven conductors 3 have a fusing function. In some embodiments, the electrical conductors 3 may be arranged in parallel and spaced apart by two, three, four, or ten, etc.

As shown in fig. 1, specifically, the interval between two adjacent electric conductors 3 is 0.5mm, 0.8mm, 1.0mm, 1.25mm, 1.27mm, 1.5mm, 2.0mm, or 2.54mm.

In the present embodiment, it is exemplarily illustrated that the distance between two adjacent electric conductors 3 is equal, and the distance between the two adjacent electric conductors 3 is a common specification of a flexible flat wire to meet the requirements of different circuits.

As shown in fig. 1, the upper insulator 2 and/or the lower insulator 1 are made of polyethylene terephthalate, polyvinyl chloride, or polyimide material, in particular.

In this embodiment, it is demonstrated that Polyethylene terephthalate (PET), polyvinyl chloride (PVC), and Polyimide (PI) are all insulating materials with excellent mechanical properties, electrical properties, and weather resistance, which can satisfy the requirements of softness, flexible folding, insulation, etc. of the flexible flat wire. It is understood that the upper insulator 2 and the lower insulator 1 may be made of the same material or different materials.

As shown in fig. 1, specifically, the upper insulator 2 and the lower insulator 1 are each in the form of a film, and the upper insulator 2 and the lower insulator 1 are press-fitted with the electric conductor 3 to form a flexible flat wire.

In the present embodiment, it is exemplarily explained that the upper insulator 2 and the lower insulator 1 are both provided in a film shape, which is advantageous for reducing the overall thickness of the flexible flat wire. During specific preparation, the conductor 3 provided with the fusing part 4 is placed on the lower insulator 1, and then the upper insulator 2 is covered on the lower insulator 1 and the conductor 3, so that the lower insulator 1, the upper insulator 2 and the conductor 3 can be pressed together to form a whole, and the flexible flat wire is obtained.

The implementation principle of the first embodiment of the application is as follows:

during the specific preparation, welding rods are firstly welded on the upper side and the lower side of the electric conductor 3, and during the welding, the molten tin is gathered into a water drop shape on the upper side and the lower side of the electric conductor 3 and forms a tin bead after being cooled; then the conductor 3 is placed on the lower insulator 1, the upper insulator 2 is covered on the lower insulator 1 and the conductor 3, and then the structure is pressed, so that the lower insulator 1, the upper insulator 2 and the conductor 3 can form a whole, and the flexible flat wire is obtained.

When the circuit where the conductor 3 is located is short-circuited or overloaded, the conductor 3 is abnormally heated due to rapid increase of current, and the melting point of the fusing part 4 is low, so when the current exceeds the maximum load current of the fusing part 4, the fusing part 4 is melted due to heating, and the fusing part and the conductor 3 mutually penetrate to form an alloy with a lower melting point by utilizing a metallurgical effect, so that the conductor 3 is rapidly fused at the position of the fusing part 4, the purpose of enabling the conductor 3 to have a fusing function is achieved, and the circuit is effectively protected.

Example two

The present embodiment provides a battery management system, and the battery management system includes any one of the flexible flat wires provided in the present application, and the flexible flat wire is used for transmitting data in the battery management system.

EXAMPLE III

The embodiment provides a battery pack, and the battery pack comprises any one of the battery management systems provided by the application.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A flexible flat wire, comprising:

a lower insulator (1);

an upper insulator (2) connected to the lower insulator (1); and

a flat conductor (3) which is provided between the lower insulator (1) and the upper insulator (2), and on which a fuse (4) is provided, the conductor (3) and the fuse (4) being made of a metal material, and the fuse (4) having a melting point lower than that of the conductor (3);

when the conductor (3) is abnormally heated, the fusing part (4) and the conductor (3) mutually permeate to form an alloy.

2. The flexible flat wire according to claim 1,

the electric conductor (3) is an aluminum foil rectangular strip, a copper foil rectangular strip or a silver foil rectangular strip.

3. The flexible flat wire according to claim 2,

the fusing part (4) is a tin bead, and the fusing part (4) is welded and fixed on the surface of the conductor (3) or embedded in the conductor (3).

4. The flexible flat wire according to claim 1,

the fusing part (4) is arranged on the upper side and the lower side of the conductor (3), the upper side of the conductor (3) is close to the upper insulator (2), and the lower side of the conductor (3) is close to the lower insulator (1).

5. The flexible flat wire according to claim 1,

the electric conductors (3) are arranged in parallel at intervals, and each electric conductor (3) is provided with the fusing part (4).

6. The flexible flat wire according to claim 5,

the interval between two adjacent electric conductors (3) is 0.5mm, 0.8mm, 1.0mm, 1.25mm, 1.27mm, 1.5mm, 2.0mm or 2.54mm.

7. The flexible flat wire according to claim 1,

the upper insulator (2) and/or the lower insulator (1) are made of polyethylene terephthalate, polyvinyl chloride or polyimide materials.

8. The flexible flat wire according to claim 7,

the upper insulator (2) and the lower insulator (1) are both in the shape of a film, and the upper insulator (2) and the lower insulator (1) are pressed together with the conductor (3) to form the flexible flat wire.

9. A battery management system, characterized in that it comprises a flexible flat wire according to any of claims 1-8, which is used to transmit data within the battery management system.

10. A battery pack, characterized in that the battery pack comprises the battery management system according to claim 9.