CN215989119U

CN215989119U - Flexible circuit board device and battery module

Info

Publication number: CN215989119U
Application number: CN202122428529.1U
Authority: CN
Inventors: 杨明平
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-03-08
Anticipated expiration: 2031-10-09

Abstract

The utility model discloses a flexible circuit board device and a battery module, and belongs to the technical field of batteries. The battery module comprises a flexible circuit board device, the flexible circuit board device comprises a flexible circuit board body and at least one sampling sheet, the sampling sheet is arranged on two sides of the length direction of the flexible circuit board body, one end of the sampling sheet is electrically connected to the flexible circuit board body, the other end of the sampling sheet is used for being electrically connected to a confluence sheet on the battery module, and the sampling sheet comprises a first open groove arranged in the middle, so that the sampling sheet can deform when being pulled. The utility model can bear the expansion of the battery module in the length direction and has lower cost.

Description

Flexible circuit board device and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a flexible circuit board device and a battery module.

Background

At present, along with the popularization of electric automobiles, the usage amount of power batteries is larger and larger. In the most core part battery module of power battery package, the voltage of battery, the collection of temperature signal play the key effect to the normal work of battery package. The voltage and temperature sampling of the traditional battery module is carried out through wiring harness collection, but the wiring harness is complex to install, wiring errors or mutual friction between wires can occur, and further potential safety hazards exist. Therefore, in the battery module, an FPC (flexible printed circuit) is increasingly used to collect a voltage and a temperature signal of the battery.

Because electric core quantity in the battery module is more and more, FPC's length is also longer and more, and the battery module is in recycling use, can lead to the length of battery module to have flexible change, and the length change of battery module can lead to FPC to produce tensile, makes the welding position change of FPC and battery, and then makes this welding position atress have the possibility of taking place the destruction. Generally, the FPC bears the expansion of the battery module in the length direction in the following two ways, 1) wrinkling the sampling position of the FPC; 2) and arranging the FPC sampling position into an S-shaped structure. The size of the FPC in the length direction is difficult to position due to the fact that the wrinkling processing is carried out, and two additional positioning points are needed to be added in front of and behind each wrinkling point; an additional hot pressing treatment is needed for the wrinkle treatment, so that the cost is increased, and meanwhile, the FPC at the hot pressing part becomes a weak point and becomes a new failure source point. Adopt S-shaped structure, FPC 'S width need increase, can lead to FPC' S cost to increase by 10% -20%, need have bigger arrangement space simultaneously, and the fixed effect of FPC sampling department is poor, more requires the height to the welding frock.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a flexible circuit board device, which can withstand the expansion of a battery module in the length direction thereof and is low in cost.

Another object of the present invention is to provide a battery module, which has high reliability and improved service life by providing the flexible circuit board device.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a flexible circuit board device, includes flexible circuit board body and at least one sampling piece, the sampling piece is set up flexible circuit board body ascending both sides in length direction, the one end electricity of sampling piece is connected in the flexible circuit board body, and the other end of sampling piece is used for the convergent current piece of electricity connection on the battery module, wherein, the sampling piece is including setting up the first fluting that carries the middle part, makes the sampling piece can warp when being pulled.

Optionally, the first open groove is a slot hole formed in the sampling sheet, or the first open groove is a groove formed in each of two sides of the sampling sheet.

Optionally, the flexible circuit board body includes that the setting is in the second fluting that is close to the position department of sample piece, the second fluting is L shape, the notched long limit of second is followed the length direction of flexible circuit board body extends, the notched minor face of second is followed the width direction of flexible circuit board body extends, just the notched minor face of second extends to the homonymy the side of flexible circuit board body.

Optionally, the short side of the second slot and the side of the flexible circuit board body on the same side are arranged at intervals, and the flexible circuit board body further comprises a third slot arranged between the short side of the second slot and the side of the flexible circuit board body.

Optionally, a distance between the third slot and a side edge of the flexible circuit board body close to the third slot is L1, and L1 is greater than or equal to 0.5mm and less than or equal to 5 mm; and/or the distance between the short sides of the third slot and the second slot is L2, and L2 is more than or equal to 0.5mm and less than or equal to 5 mm.

Optionally, the flexible circuit board body further includes a crack stop groove, and the crack stop groove is communicated with one end of the long side of the second open groove, which is far away from the short side of the second open groove.

Optionally, the crack arrest groove is circular, and the radius of the crack arrest groove is r, wherein r is greater than or equal to 0.25mm and less than or equal to 10 mm.

Optionally, in the length direction of the flexible circuit board body, a distance between the center of the sampling sheet in the width direction and the crack stop groove is L3, and L3 is not less than 3mm and not more than 8 mm.

Optionally, the width of the sampling sheet obtained by subtracting the first slot from the position where the first slot is opened is L4, and L4 is greater than or equal to 0.3mm and less than or equal to 6 mm.

A battery module comprises a module body, a bus sheet and the flexible circuit board device, wherein the bus sheet is arranged on the module body, the flexible circuit board device is arranged on the module body, and the sampling sheet is electrically connected to the bus sheet.

The utility model has the beneficial effects that:

according to the flexible circuit board device, the first notch is formed in the sampling sheet, so that the rigidity of the sampling sheet can be reduced, the sampling sheet can deform to compensate the expansion amount of the battery module in the length direction when the battery module expands, the tearing or the separation of the connection part of the sampling sheet and the confluence sheet is reduced, the reliability of the battery module is improved, the service life of the battery module is prolonged, and in addition, the first notch is convenient to process and can reduce the cost.

According to the battery module, the flexible circuit board device is arranged, so that the reliability is high, and the service life can be prolonged.

Drawings

Fig. 1 is a perspective view of a battery module according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a partial structural schematic diagram of a state after a flexible circuit board device according to an embodiment of the present invention is deformed;

FIG. 4 is a perspective view of a sampling sheet provided in accordance with an embodiment of the present invention;

fig. 5 is a side view of a battery module according to an embodiment of the present invention;

fig. 6 is an enlarged view at B in fig. 3.

Reference numerals:

1. a module body;

2. a confluence sheet;

3. a flexible circuit board device; 31. a flexible circuit board body; 311. a second slot; 312. a third slot is formed; 313. a crack stop groove; 32. sampling a sample sheet; 321. a first slot; 3211. a slot; 3212. and (4) a groove.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to 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. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to fig. 1 to 6.

The present embodiment provides a battery module, as shown in fig. 1, the battery module includes a module body 1, a bus bar 2 disposed on the module body 1, and a flexible circuit board device 3.

In detail, as shown in fig. 1 to 3, the flexible circuit board device 3 includes a flexible circuit board body 31 and at least one sampling sheet, and the sampling sheets 32 are disposed at both sides of the flexible circuit board body 31 in a length direction. The flexible circuit board body 31 is arranged on the module body 1, one end of the sampling sheet 32 is electrically connected to the flexible circuit board body 31, and the other end of the sampling sheet is electrically connected to the bus sheet 2 on the battery module. Wherein the sampling sheet 32 includes a first slit 321 disposed in the middle, so that the sampling sheet 32 can be deformed when being pulled.

In this embodiment, the rigidity of the sampling sheet 32 can be reduced by forming the first notch 321 in the sampling sheet 32. When the battery module inflation, sampling piece 32 can take place to warp in order to compensate the battery module in the ascending inflation volume of its length direction, reduces sampling piece 32 and converges the junction of piece 2 and tear or break away from, improves battery module's reliability and life. In addition, the first slot 321 is convenient to process, and the cost can be reduced.

As shown in fig. 2, the first slot 321 is a slot 3211 formed on the sampling sheet 32. In detail, the slot 3211 may extend in a longitudinal direction of the sampling sheet 32. In some alternative embodiments, the number of slots 3211 may be one, two, or more. In the present embodiment, it is preferable that two sampling pieces 32 are provided so that a certain rigidity can be satisfied when the sampling piece 32 is deformed when the module body 1 is expanded.

In other embodiments, as shown in fig. 4, the first slots 321 are grooves 3212 respectively formed on two sides of the sampling sheet 32. It can be understood that after the sampling sheet 32 is provided with the groove 3212, the width of the position of the sampling sheet 32 where the groove 3212 is provided is relatively narrow, so as to facilitate deformation.

In order to facilitate the deformation of the sampling sheet 32, as shown in fig. 4 to 6, the width of the sampling sheet 32 obtained by subtracting the first notch 321 from the position of the first notch 321 is L4, and L4 is not less than 0.3mm and not more than 6 mm. In some alternative embodiments, L4 is 0.3mm, 1mm, 1.7mm, 2mm, 2.4mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, or 6mm, etc. As shown in fig. 6, when the first slot 321 is a slot 3211 formed in the sampling sheet 32, and two slots 3211 are provided, L4 is L41+ L42+ L43.

In order to improve the ability of the flexible circuit board device 3 in the present embodiment to withstand a large amount of expansion, as shown in fig. 2, the flexible circuit board body 31 includes a second slot 311 provided at a position close to the sampling sheet 32. The second slot 311 is L-shaped, a long side of the second slot 311 extends along the length direction of the flexible circuit board body 31, a short side of the second slot 311 extends along the width direction of the flexible circuit board body 31, and the short side of the second slot 311 extends to the side of the flexible circuit board body 31 on the same side. It can be understood that, when the expansion amount of the module body 1 is large, the flexible circuit board body 31 and the sampling sheet 32 are subjected to a large pulling force in the length direction of the flexible circuit board body 31, the deformation amount of the sampling sheet 32 is not enough to compensate the expansion amount, and the flexible circuit board body 31 is broken at a position where the short side of the second slot 311 is far away from one end of the long side of the second slot 311, so that the expansion amount can be further compensated.

Further, in order to enable the flexible circuit board body 31 to meet a certain strength requirement and to break when the stress is large so as to compensate for the expansion amount, the short side of the second slot 311 and the side of the flexible circuit board body 31 on the same side are arranged at intervals, and the flexible circuit board body 31 further includes a third slot 312 arranged between the short side of the second slot 311 and the side of the flexible circuit board body 31. In detail, the third groove 312 has a square shape.

Further, as shown in FIG. 5 and FIG. 6, the distance between the third slot 312 and the side of the flexible circuit board body 31 near the third slot 312 is L1, and L1 is 0.5mm ≦ L1 ≦ 5 mm. Alternatively, L1 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc. The distance between the short sides of the third slot 312 and the second slot 311 is L2, and L2 is more than or equal to 0.5mm and less than or equal to 5 mm. Alternatively, L2 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc. Through the limitation to the position of the third slot 312, the FPC has a certain strength, and at the same time, the short side position of the flexible circuit board body 31 corresponding to the second slot 311 can be torn before the connection part of the sampling sheet 32 and the bus sheet 2, which is beneficial to ensuring the normal use of the battery module in the embodiment and improving the service life.

As shown in fig. 6, the flexible circuit board body 31 further includes a crack stop groove 313, and the crack stop groove 313 is communicated with one end of the long side of the second open groove 311 far away from the short side of the second open groove 311. By the provision of the crack stop groove 313, the flexible circuit board body 31 is prevented from being torn at the second open groove 311. In detail, the groove wall of the crack stopper groove 313 is arc-shaped.

In the embodiment, the crack arrest groove 313 is preferably circular, and in detail, the radius of the crack arrest groove 313 is r, and r is more than or equal to 0.25mm and less than or equal to 10 mm. In some alternative embodiments, r is 0.25mm, 0.5mm, 0.75mm, 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 10 mm.

As shown in fig. 5 and 6, in the longitudinal direction of the flexible circuit board body 31, the distance between the center line of the sampling sheet 32 in the width direction and the crack stopper 313 is L3, and L3 is equal to or less than 3mm and equal to or less than 8 mm. In some alternative embodiments, L3 is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, or the like.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. A flexible circuit board device, comprising:

a flexible circuit board body (31); and

at least one sampling sheet (32) is arranged on two sides of the flexible circuit board body (31) in the length direction, one end of the sampling sheet (32) is electrically connected to the flexible circuit board body (31), the other end of the sampling sheet (32) is used for being electrically connected to a bus sheet (2) on the battery module,

wherein the sampling sheet (32) comprises a first slot (321) arranged in the middle, so that the sampling sheet (32) can deform when being pulled.

2. The flexible circuit board device of claim 1, wherein the first slot (321) is a slot hole (3211) formed on the sampling sheet (32), or the first slot (321) is a groove (3212) formed on each side of the sampling sheet (32).

3. The flexible circuit board device according to claim 1, wherein the flexible circuit board body (31) includes a second slot (311) disposed at a position close to the sampling sheet (32), the second slot (311) is L-shaped, a long side of the second slot (311) extends along a length direction of the flexible circuit board body (31), a short side of the second slot (311) extends along a width direction of the flexible circuit board body (31), and the short side of the second slot (311) extends to a side of the flexible circuit board body (31) on the same side.

4. The flexible circuit board device according to claim 3, wherein the short side of the second slot (311) and the side of the flexible circuit board body (31) on the same side are spaced apart, and the flexible circuit board body (31) further comprises a third slot (312) disposed between the short side of the second slot (311) and the side of the flexible circuit board body (31).

5. The flexible circuit board device according to claim 4, wherein the distance between the third slot (312) and the side of the flexible circuit board body (31) close to the third slot (312) is L1, 0.5mm ≦ L1 ≦ 5 mm; and/or the distance between the short sides of the third open slot (312) and the second open slot (311) is L2, and L2 is more than or equal to 0.5mm and less than or equal to 5 mm.

6. The flexible circuit board device according to claim 3, wherein the flexible circuit board body (31) further comprises a crack stop groove (313), and the crack stop groove (313) is communicated with one end of the long side of the second slot (311) far away from the short side of the second slot (311).

7. The flexible circuit board device according to claim 6, wherein the crack stop groove (313) is circular, and the radius of the crack stop groove (313) is r, and r is greater than or equal to 0.25mm and less than or equal to 10 mm.

8. The flexible circuit board device according to claim 6, wherein a distance between a center of the sampling piece (32) in a width direction and the crack stopper groove (313) in a length direction of the flexible circuit board body (31) is L3, 3mm ≦ L3 ≦ 8 mm.

9. The flexible circuit board device of claim 1, wherein the sampling sheet (32) has a width L4 obtained by subtracting the first slot (321) from the position of the first slot (321), and the width L4 is 0.3mm or more and 6mm or less.

10. A battery module, comprising:

a module body (1);

a confluence sheet (2) arranged on the module body (1); and

the flexible circuit board device according to any one of claims 1 to 9, wherein the flexible circuit board body (31) is provided to the module body (1), and the sampling sheet (32) is electrically connected to the bus sheet (2).