CN219873964U - Copper-aluminum alloy crimping terminal and battery CCS module - Google Patents

Abstract

The utility model relates to the technical field of flexible printed circuits, flat or ribbon cables or similar structures, in particular to a copper-aluminum alloy crimping terminal and a battery CCS module. The utility model provides a connecting structure between copper and aluminum electrode plates, which are buckled together through the connecting structure and then connected together in a crimping manner to form the electrode plate with higher overall stability. The utility model has the following beneficial effects: firstly, providing a copper-aluminum composite electrode plate which is stably connected in a stamping and crimping mode so as to be applied to connecting a battery bus and a circuit board; secondly, an inserting type connection mode and a clamping type connection mode are provided so as to meet different requirements of the composite electrode plate; thirdly, providing an optimal connection length range of the connection part of the copper-aluminum composite electrode sheet so as to enable the composite electrode sheet to obtain optimal mechanical strength; fourthly, a clamping angle is arranged on one side of the composite electrode plate and used for forming fixation with the circuit board in a puncturing and crimping mode, and electric conduction is realized.

Description

Copper-aluminum alloy crimping terminal and battery CCS module

Technical Field

The utility model relates to the technical field of flexible printed circuits, flat or ribbon cables or similar structures, in particular to a copper-aluminum alloy crimping terminal and a battery CCS module.

Background

The new energy automobile is used as a kind of automobile driven by batteries, the annual sales of 2021 in China can reach 300 ten thousand, and the battery module used in the new energy automobile is important for affecting the development of the whole industry. The battery module in the automobile requires that the occupied space is as small as possible so as to provide enough space for passengers to take, and in general, a flexible circuit board (Flexible Printed Circuit Board, FPC) is adopted in the industry to meet the requirements of smaller and higher-density battery installation, and a battery multilayer composite structure connecting row (bus) is connected to the FPC through a conductive sheet pressed by alloy, so that the battery module can be freely bent, rolled and folded, can bear millions of dynamic bending without damaging wires, can be randomly arranged according to the space layout requirement, and can be randomly moved and stretched in a three-dimensional space, thereby achieving the integration of component assembly and wire connection. For example, chinese patent publication No. CN113497368A, publication No. 2021-10-12 discloses a flexible printed wiring board provided with a crimp terminal, which has a base film, a circuit composed of a metal foil provided on a surface of the base film, and a cover film bonded to the base film so as to sandwich the circuit; and a crimp terminal including a plurality of crimp pieces that penetrate the flexible printed wiring board by being crimped.

The metal used for preparing the pressing sheet is copper, the copper has strong conductivity, but the copper metal value is higher than that of the common metal, namely about 4.6 ten thousand/ton, and the copper metal needs to be used on FPC in a large amount, the conductivity of aluminum can be comparable to that of copper, the conductivity of the copper-aluminum electrode sheet prepared by combining with copper is different from that of pure copper, and the price of the copper-aluminum electrode sheet is about 1.6 ten thousand/ton, so that the copper-aluminum electrode sheet is accepted by the mainstream market at present. And aluminum and the bus bar are stable in welding, for example, the Chinese utility model with bulletin number of CN217215029U and bulletin day of 2022-08-16 discloses a novel safety protection energy module, which comprises a front end plate, a rear end plate, a battery core, an upper steel belt and a lower steel belt, wherein an electrode column is arranged at the upper end of the battery core, the upper end of the electrode column is connected with a composite busbar in a clamping manner, the sheet-shaped structure part of the composite busbar is an aluminum-supported sheet, and the bus bar connected with the battery core is well welded together. Therefore, if the part of the electrode plate, which is close to the busbar, is replaced by aluminum, the copper is reserved on one side of the FPC, and a better conductive effect can be obtained.

However, it is difficult to combine copper and aluminum to form a composite electrode sheet, because of the difference in metal properties and mechanical strength between copper and aluminum, and after pure welding, for example, laser welding, the welding position between the copper and aluminum is not stable enough in the subsequent reliability test, and the quality requirement cannot be met.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a connecting structure between copper and aluminum electrode plates, which are buckled together through the connecting structure and then connected together in a crimping manner to form the electrode plate with higher overall stability.

The technical aim of the utility model is realized by the following technical scheme: the copper-aluminum alloy crimping terminal comprises a copper electrode plate and an aluminum electrode plate, and is characterized by further comprising a fixing part arranged on the copper electrode plate and a connecting part arranged on the aluminum electrode plate and combined with the fixing part (3) in a stamping mode; the fixing part comprises a fixing piece, the thickness of the fixing piece is 0.2-0.3mm, the connecting part comprises a connecting piece, and the thickness of the connecting piece is smaller than 0.4mm.

If the copper electrode plate and the aluminum electrode plate are combined together, the copper-aluminum integrated electrode plate can be obtained by only overlapping the connecting part on the copper electrode plate on the connecting part on the aluminum electrode plate and then pressing the copper electrode plate and the aluminum electrode plate together through a punching machine, and the composite electrode plate with one end being the copper electrode plate and the other end being the aluminum electrode plate. The connection mode can not cause poor stability after connection because of different properties of copper and aluminum, and has the advantages of simple process steps, reduced manufacturing cost and high manufacturing efficiency.

Preferably, the thickness of the connecting sheet is 0.3-0.4mm.

Because the aluminum material is softer than copper, in the actual preparation process of the composite electrode plate, the thickness of the aluminum material part is required to be slightly higher than that of the copper material, and the mechanical properties of the copper-aluminum composite electrode plate prepared by the method are stable. In addition, the conductivity of copper is slightly higher than that of aluminum, and the thicker aluminum material part enables the resistance of the aluminum material to be further reduced so as to balance the conductivity between copper and aluminum, so that on one hand, the current is kept stable, and on the other hand, the phenomenon that after long-time power-on, the copper and aluminum are heated unevenly due to different resistances, and the electrode plate is deformed due to uneven deformation is avoided.

Preferably, the fixing part further includes a locking angle provided on the fixing piece.

In the utility model, the clamping angles are arranged at two sides of the fixing part, and when the FPC is installed, the clamping angles pierce the copper sheet of the circuit board positioned on the FPC, and the installation is realized, and the specific installation mode is shown in fig. 5.

Preferably, the number of the clamping angles is 2-3.

As a preferable aspect of the present utility model, the fixing part further includes a first clamping member disposed on the fixing piece; the connecting part further comprises a second clamping piece which is arranged on the connecting piece and used for being inserted into the connecting groove.

Preferably, the first clamping piece and the second clamping piece are wedge-shaped.

Preferably, the first clamping piece has a depth and the second clamping piece has a length of 5-7mm.

Preferably, the fixing part further includes a first clamping piece provided on the fixing piece, and the connecting part further includes a second clamping piece provided on the connecting piece and used for connecting the first clamping piece.

Preferably, the length of the first clamping piece and the second clamping piece is 5-7mm.

Preferably, the lengths of the copper electrode sheet and the aluminum electrode sheet are 10-15mm.

The battery CCS module of the copper-aluminum alloy crimping terminal further comprises a battery bar and a circuit board, and the copper-aluminum alloy crimping terminal is connected between the battery bar and the circuit board.

In summary, the utility model has the following beneficial effects:

firstly, providing a copper-aluminum composite electrode plate which is stably connected in a stamping and crimping mode so as to be applied to connecting a battery bus and a circuit board;

secondly, an insertion type connection mode and a clamping type connection mode are provided to cope with different use fields Jing Xuqiu of the composite electrode slice;

thirdly, providing an optimal connection length range of the connection part of the copper-aluminum composite electrode sheet, so that the composite electrode sheet after stamping and crimping obtains optimal mechanical strength;

fourthly, a clamping angle is arranged on one side of the composite electrode plate and used for being buckled and fixed with a clamping groove of the circuit board.

Drawings

FIG. 1 is a schematic diagram of a first embodiment;

FIG. 2 is a schematic diagram of an electrode plate crimped by a first clamping member and a second clamping member;

FIG. 3 is a schematic view of an electrode sheet crimped by a first clamping sheet and a second clamping sheet;

FIG. 4 is a schematic diagram of an embodiment applied to connect a battery bus and a circuit board;

fig. 5 is an enlarged schematic view of the snap angle portion of fig. 4.

In the drawings, the components represented by the respective reference numerals are as follows: battery bus a, circuit board B, circuit board copper sheet B01, copper electrode sheet 1, aluminum electrode sheet 2, fixing part 3, connecting part 4, fixing piece 301, clamping angle 302, first clamping piece 303, first clamping piece 304, connecting piece 401, second clamping piece 402, second clamping piece 403.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

In the first embodiment, as shown in fig. 1, a copper-aluminum alloy crimping terminal comprises a copper electrode plate 1 and an aluminum electrode plate 2, wherein the two electrode plates are of rectangular structures, the thickness is 0.4-0.5mm, and is generally 0.4mm, and the lengths of the copper electrode plate 1 and the aluminum electrode plate 2 are 10-15mm, and are generally 15mm.

In this embodiment, the copper electrode sheet 1 is provided with a fixing portion 3 near one end of the aluminum electrode sheet 2, the fixing portion 3 includes a fixing piece 301, and the fixing piece 301 is a part of the copper electrode sheet 1, but its thickness is not higher than the copper electrode sheet 1 body. The aluminum electrode plate 2 is also provided with a connecting part 4 near the copper electrode plate 1, the connecting part 4 comprises a connecting sheet 401, and the connecting sheet is a part of the aluminum electrode plate 2, but the thickness of the connecting sheet is not higher than that of the aluminum electrode plate 2 body. The fixing portion 3 and the connecting portion 4 are characterized in that they can be mutually matched, and stability after combination is higher than that of laser welding.

The manufacturing process of the crimping terminal comprises the following steps:

s1, preparing materials, namely preparing a composite material with one side of the copper electrode plate 1 being the aluminum electrode plate 2, and carrying out surface coating treatment;

s2, mounting, namely mounting the aluminum and copper composite material prepared in the step S1 on a transmission mechanism matched with a die for use;

s3, stamping and forming, namely stamping the conductive connecting sheet body through a die at one time through the cooperation of the transmission mechanism;

s4, detecting the product which is formed by stamping in the S3 through a detection device;

s5, mounting, namely transplanting the qualified product detected in the S4 onto a circuit board to be connected through a transplanting mechanism, and mounting the product on the circuit board through mounting equipment.

The form of the fixing portion 3 on the copper electrode sheet 1 and the connecting portion 4 on the aluminum electrode sheet 2 can be divided into two types: the insertion type (fig. 2) and the clamping type (fig. 3) can fix the copper electrode sheet 1 and the aluminum electrode sheet 2 firmly, but the formed composite electrode sheet has different performances, and the two fixing modes are described in detail below:

< plug-in connection scheme >

As shown in fig. 2, in the plug-in connection mode, the fixing portion 3 on the copper electrode sheet 1 has a first clamping member 303 near one end of the aluminum electrode sheet 2, and the connecting portion 4 on the aluminum electrode sheet 2 has a second clamping member 402 near one end of the copper electrode sheet 1, where the first clamping member 303 and the second clamping member 402 may be protrusions or grooves, but the first clamping member 303 and the second clamping member 402 need to be matched with each other, i.e. when the first clamping member 303 is the protrusion, the second clamping member 402 is the groove, as shown in fig. 2, or both the first clamping member 303 and the second clamping member 402 are protrusions that can be matched with each other, as shown in fig. 3. The size of the second clamping piece is the same as the shape and the volume of the grooving depth of the first clamping piece, the common shape is a wedge shape, the wedge shape is a shape with the side similar to an inverted triangle, as shown in fig. 2, the situation that the first clamping piece 303 and the second clamping piece 402 are in the shape of the wedge is shown in the figure, and the contact area between the second clamping piece 402 and the first clamping piece 303 is larger due to the wedge shape, so that the contact area is firmer after the clamping is performed; when the first clamping member 303 is wedge-shaped, the outer opening is large, the inner opening is narrow, so that the installation of the second clamping member 402 is more convenient, but the wedge-shaped shape of the second clamping member 402 and the first clamping member 303 is not represented.

In addition, in the plug-in connection mode, the first clamping member 303 and the second clamping member 402 may be mutually provided with a plurality of clamping members, and in a preferred case, the first clamping member 303 is a protrusion, and is made of copper, so that the processing difficulty is reduced, and the production is facilitated.

Regarding the length and depth of the second clamping member 402 matching with the first clamping member 303, the longer the second clamping member 402 is, the more suitable, but the longer the second clamping member 402 is, the more suitable the first clamping member 303 is, the more suitable the second clamping member 402 cannot be matched with the second clamping member 402, which is produced in actual production, through experiments, the depth of the first clamping member 303 is, and the length of the second clamping member 402 is 5-7mm.

< clip connection method >

As shown in fig. 3, in the clamping connection mode, a first clamping piece 304 is provided at one end of the fixing portion 3 on the copper electrode sheet 1, which is close to the aluminum electrode sheet 2, and a second clamping piece 403 is provided at one end of the connecting portion 4 on the aluminum electrode sheet 2, which is close to the copper electrode sheet 1, so that the lengths of the first clamping piece 304 and the second clamping piece 403 are the same, so that the copper electrode sheet 1 and the aluminum electrode sheet 2 form a whole after being crimped, the thicknesses of the first clamping piece 304 and the second clamping piece 403 can be different, but when the thicknesses of the first clamping piece 304 and the second clamping piece 403 are the same, the obtained connection strength by being crimped is the highest.

Regarding the selection of the length of the first and second engaging pieces 304 and 403, generally, the longer and more suitable, but the thinner design causes the first and second engaging pieces 304 and 403 to be too long to break at the junction between both pieces and the copper electrode sheet 1 or the aluminum electrode sheet 2 before processing, and is not suitable for further processing, so that the first and second engaging pieces 304 and 403 are most suitable in length of 5 to 7mm through experiments.

< mechanical test of electrode sheet >

In the step S4, detecting the composite electrode plates with different thicknesses and different connection modes respectively:

test example 1: the fixing part 3 on the copper electrode plate 1 is provided with a first clamping piece 304 near one end of the aluminum electrode plate 2, the connecting part 4 on the aluminum electrode plate 2 is provided with a second clamping piece 402 near one end of the copper electrode plate 1,

the composite electrode sheet is placed on a tensile tester, the two ends of the composite electrode sheet are fixed on a fixing frame of the tensile tester, the stretching speed of the fixing frame of the tensile tester is set to be 2.5mm/min, and the time length of a timer when the composite electrode sheet breaks is recorded.

Test example 2:

the composite electrode sheet is placed on a tensile tester, two ends of the composite electrode sheet are fixed on a fixing frame of the tensile tester, a fixing claw on one side of the fixing frame of the tensile tester is rotated, the rotating speed is 30 degrees/min, and the time length of a timer when the composite electrode sheet breaks is recorded.

Tensile and rotational tests of test examples 1 and 2 were performed on composite electrode sheets having copper electrode sheets and aluminum electrode sheets with different thicknesses, and the results are shown in the following table:

it will be seen therein that when the composite electrode sheet thickness is 0.2-0.4mm, the time for the occurrence of the break after both the tensile and rotational tests can be maintained, demonstrating that the electrode sheet performance at this thickness is better.

In order to test the influence of the connection modes of the insertion type (fig. 2) and the clamping type (fig. 3) on the performance of the composite electrode sheet, electrode sheets with the thickness of 0.3mm were taken and connected through the insertion type and the clamping type respectively, and the test was performed according to test examples 1 and 2, and the results are shown in the following table:

therefore, when the connection mode is insertion type, the composite electrode plate is more resistant to stretching rather than rotating, when the connection mode is clamping type, the composite electrode plate is more resistant to rotating rather than stretching, and a proper connection mode can be selected according to actual requirements.

< concerning the clip angle 302>

As shown in fig. 1, the locking angle 302 is a part of the fixing portion 3, and is located at two sides of the fixing piece 301 (not shown in the drawing), and in S3, the fixing portion 3 body and the locking angle 302 are punched out at one time by a die in the punching forming, as shown in fig. 4, the following locking angle 302 is used:

a) Firstly, cutting the conductive connecting sheet along the root of the fixing part 3 of the body, and sucking the conductive connecting sheet to a position to be installed on the alignment circuit board by using riveting equipment

B) The clamping angle 302 is buckled and fixed with the clamping groove of the circuit board B by utilizing a matched installation mechanism of the equipment.

The clamping angle 302 fixes the conductive sheet, the battery bus A and the circuit board B in a physical fixing mode, so that the fixing of the conductive sheet and the circuit board is effectively improved, and the installation stability of the conductive sheet is further improved compared with that of the conductive sheet in a general welding or bonding mode.

Furthermore, references to the terms "vertical", "horizontal", "top", "bottom", "front", "rear", "upper", "lower", "inner", "outer", etc. in the embodiments of the present utility model indicate that the apparatus or element in question has to have a particular orientation, be constructed and operated in a particular orientation, and should not be construed as limiting the utility model, either based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the article is conventionally put in use, merely for convenience of describing the utility model and for simplicity of description.

Claims (10)

1. The copper-aluminum alloy crimping terminal comprises a copper electrode plate (1) and an aluminum electrode plate (2), and is characterized by further comprising a fixing part (3) arranged on the copper electrode plate (1) and a connecting part (4) arranged on the aluminum electrode plate (2) and combined with the fixing part (3) in a stamping mode; the fixing part (3) comprises a fixing piece (301), the thickness of the fixing piece (301) is 0.2-0.3mm, the connecting part (4) comprises a connecting piece (401), and the thickness of the connecting piece (401) is smaller than 0.4mm.

2. A copper-aluminum alloy crimp terminal according to claim 1, wherein the connecting piece (401) has a thickness of 0.3-0.4mm.

3. A copper-aluminum alloy crimp terminal according to claim 1, wherein the fixing portion (3) further comprises a snap angle (302) provided on the fixing piece (301) and for fixing the connecting piece (401).

4. A copper-aluminum alloy crimp terminal according to claim 1, wherein the fixing portion (3) further comprises a first clamping piece (303) provided on the fixing piece (301); the connecting part (4) further comprises a second clamping piece (402) which is arranged on the connecting piece (401) and used for being inserted into the connecting groove.

5. The copper aluminum alloy crimp terminal of claim 4, wherein the first clamping member (303) and the second clamping member (402) are wedge-shaped.

6. The copper aluminum alloy crimp terminal of claim 4, wherein the first clamping member (303) has a depth and the second clamping member (402) has a length of 5-7mm.

7. A copper-aluminum alloy crimp terminal according to claim 1, wherein the fixing portion (3) further includes a first engaging piece (304) provided on the fixing piece (301), and the connecting portion (4) further includes a second engaging piece (403) provided on the connecting piece (401) and used for connecting the first engaging piece (304).

8. The copper-aluminum alloy crimp terminal according to claim 7, wherein the first engaging piece (304) and the second engaging piece (403) are 5-7mm in length.

9. A copper-aluminium alloy crimp terminal according to claim 7, characterized in that the copper electrode plate (1) and the aluminium electrode plate (2) have a length of 10-25mm.

10. A battery CCS module comprising the copper-aluminum alloy crimp terminal according to any one of claims 1-9, further comprising a battery busbar and a wiring board, said copper-aluminum alloy crimp terminal being connected between said battery busbar and said wiring board.