WO2019184494A1

WO2019184494A1 - Electrical connection component and battery module

Info

Publication number: WO2019184494A1
Application number: PCT/CN2018/124617
Authority: WO
Inventors: 邹华斌; 黄爱芳; 王德荣; 周灵刚; 包聪
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2018-03-30
Filing date: 2018-12-28
Publication date: 2019-10-03
Also published as: CN207967151U

Abstract

The present application relates to an electrical connection component and a battery module. The electrical connection component is for use in the battery module and comprises at least one electrically-conductive plate. The electrically-conductive plate comprises connection areas distributed at an interval in a first direction and shock absorbing areas connected between every two adjacent connections areas. The shock absorbing areas comprise multiple protruding parts provided consecutively in the first direction and formed by bending the electrically-conductive plate. The direction of protrusion of the protruding parts is opposite to the direction of protrusion of two protruding parts angled and adjacent to each other in the first direction. Of the electrical connection component and the battery module provided in the embodiments of the present application, the electrical connection component is capable of effectively absorbing the force of impact of a vibration, adaptable to an expensive distension of a single battery, and not prone to fracturing, thus allowing the battery module to steadily input or output electrical energy.

Description

Electrical connection assembly and battery module

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 20,182, 046, 759, filed on Jan. 30, s.

Technical field

The present application relates to the field of battery technologies, and in particular, to an electrical connection assembly and a battery module.

Background technique

In the related art, the battery system can be divided into a battery pack, a battery module and a single battery according to the system hierarchy from high to low. Most of the battery modules produced by domestic and foreign lithium battery manufacturers are based on single cells. The smallest unit, that is, the first production of a single battery, two or more single cells are assembled into a battery module through a series of parallel connection of aluminum bars and other electrical components, and two or more battery modules are connected in series and in parallel through electrical connection components. The way to form a battery pack.

For battery systems, the most basic functional requirement is that electrical energy can be input and output, so the safety and reliability of the electrical connection components in the battery system is particularly important. When the electrical connection component on the current market is connected with the module output pole of the battery module or the pole of the single battery, especially the vibration impact force is generated by ultrasonic welding, which causes the electrical connection component to be easily cracked. At the same time, when a height difference occurs between the single cells, the solder joint between the electrical connection component and the battery post is prone to occur, and when the single cell is charged and discharged, the electrical connection component cannot overcome the deformation of the single cell, and may also be generated. Cracking problem.

Therefore, there is a need for a new electrical connection assembly and battery module.

Summary of the invention

The embodiment of the present application provides an electrical connection component and a battery module. The electrical connection component is used for a battery module, can effectively absorb vibration impact force, and can adapt to expansion deformation of a single battery, and is not easy to crack.

In one aspect, an electrical connection assembly is provided according to an embodiment of the present application, for a battery module, including at least one conductive sheet, the conductive sheet includes a connection region spaced apart in a first direction and connected to each adjacent two a vibration absorption region between the connection regions; the vibration absorption region includes a plurality of convex portions continuously arranged in the first direction and bent by the conductive sheet, the convex direction of the convex portion intersecting the first direction and adjacent to the two convex portions The protruding portion has a convex direction opposite; the convex portion includes a central convex portion located at a central position of the vibration absorbing region and a side convex portion distributed at two sides of the central convex portion, and the opening width of the central convex portion along the first direction is greater than The width of the opening of the side convex portion in the first direction.

In another aspect, a battery module according to an embodiment of the present application includes a plurality of single cells, a module output pole, and the above-mentioned electrical connection component. The plurality of single cells are connected in series or in parallel through electrical connection components, and the module outputs The pole is electrically connected to the unit cell that is the output or input of the battery module through the electrical connection assembly.

According to the electrical connection assembly and the battery module provided by the embodiment of the present application, the electrical connection assembly includes at least one conductive sheet, and the conductive sheet includes a connection region spaced apart in the first direction and connected between each adjacent two connection regions. Damping area. When applied to the battery module, the connection area can be connected to the poles of the unit cells constituting the battery module, so that the unit cells can be connected in series or in parallel, and the module output pole can be used as a battery module through the connection area. The battery cells at the output or input are electrically connected. Since the conductive sheet is provided with the vibration absorption region, the vibration absorption region includes a plurality of convex portions which are continuously disposed in the first direction and are bent by the conductive sheet, and the convex direction of the convex portion intersects with the first direction, and the adjacent two The convex portions have opposite convex directions, and the convex portion includes a central convex portion located at a center position of the vibration absorption region and a side convex portion distributed on both sides of the central convex portion, and the central convex portion is along the first direction The opening width is greater than the opening width of the side protrusions in the first direction, so that the electrical connection assembly can effectively absorb the vibration impact between the electrical connection component and the pole of the unit cell or between the module output poles, The utility model can adapt to the height difference between the single cells, avoid the virtual welding, and can adapt to the expansion deformation of the single battery during charging and discharging, has higher fatigue strength and is not easy to crack.

DRAWINGS

Features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

1 is a schematic structural view of an electrical connection assembly according to an embodiment of the present application;

Figure 2 is a front elevational view of the electrical connector assembly of Figure 1;

3 is a schematic view showing the connection between the electrical connection component of FIG. 1 and the output pole of the module;

Figure 4 is a schematic view showing the connection between the electrical connecting component shown in Figure 1 and a single cell;

5 is a schematic structural view of an electrical connection assembly according to another embodiment of the present application;

6 is a schematic structural view of an electrical connection assembly according to still another embodiment of the present application;

Figure 7 is a front elevational view of the electrical connector assembly of Figure 6;

FIG. 8 is a partial schematic structural view of a battery module according to an embodiment of the present application.

among them:

1-electrical connection assembly;

10-conductive sheet;

11-connection zone; 111-positioning hole;

12-absorption zone; 121-protrusion; 121a-central projection; 121b-side projection;

13-circular transition zone;

14-proof flag;

2-module output pole;

3-cell battery;

M - first direction; n - width direction.

detailed description

Features and exemplary embodiments of various aspects of the present application are described in detail below. In the following detailed description, numerous specific details are set forth However, it will be apparent to those skilled in the art that the present disclosure may be practiced without some of the details. The following description of the embodiments is merely provided to provide a better understanding of the present application. In the drawings and the following description, at least some of the structures and techniques are not shown in order to avoid unnecessary obscuring of the present application; and, for clarity, the dimensions of some of the structures may be exaggerated. Furthermore, the features, structures, or characteristics described hereinafter may be combined in any suitable manner in one or more embodiments.

The orientation words appearing in the following description are all directions shown in the drawings, and are not intended to limit the specific structure of the electrical connection assembly and the battery module of the present application. In the description of the present application, it should also be noted that the terms "installation" and "connection" are to be understood broadly, and may be, for example, a fixed connection or a detachable connection, or Connected in one piece; they can be connected directly or indirectly. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood as the case may be.

For a better understanding of the present application, the electrical connection assembly and the battery module according to the embodiments of the present application are described in detail below with reference to FIGS. 1 through 8.

Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic structural view of an electrical connection assembly 1 according to an embodiment of the present application, and FIG. 2 is a front view of the electrical connection assembly 1 shown in FIG. According to an embodiment of the present application, an electrical connection assembly 1 is provided for a battery module, including a conductive sheet 10, and the conductive sheet 10 includes two connection regions 11 spaced apart in a first direction m and connected to two The vibration absorbing region 12 between the connection regions 11 includes three convex portions 121 which are continuously disposed in the first direction m and are bent by the conductive sheets 10 themselves, and each of the convex portions 121 preferably has a cross section. The arc shape, said continuous arrangement means that the three bosses 121 are sequentially connected in the first direction m. The convex direction of the convex portion 121 intersects with the first direction m and the convex directions of the adjacent two convex portions 121 are opposite. In this embodiment, the angle a between the protruding direction of the convex portion 121 and the first direction m is preferably 90°, of course, not limited to 90°, and may be other values greater than 0° and less than 90°, convex. The rising portion 121 is a strip-shaped projection formed to extend through the conductive sheet 10 in the width direction n of the conductive sheet 10.

Please refer to FIG. 3 and FIG. 4 together. FIG. 3 is a schematic diagram showing the connection between the electrical connection component 1 and the module output pole 2 of FIG. 1. FIG. 4 shows the electrical connection component 1 and the single of FIG. A schematic diagram of the connection between the body batteries 3. The electrical connection assembly 1 provided in the embodiment of the present application can be connected to the poles of the unit cells 3 constituting the battery module through the connection region 11 when the battery module is applied to connect the unit cells 3 in series or in parallel. It is also possible to electrically connect the module output pole 2 to the unit cell 3 which is the output or input terminal of the battery module via the connection area 11. In order to facilitate connection with the poles of the unit cells 3, connection holes capable of matching the shape of the poles are provided on each of the connection regions 11 so as to be fastened to the corresponding poles, and at the same time in the connection holes. A positioning hole 111 penetrating through the conductive sheet 10 is disposed at the center to facilitate the positioning and welding of the connecting portion 11 and the corresponding pole.

Meanwhile, since the conductive sheet 10 is provided with the vibration absorbing region 12, the vibration absorbing region 12 includes three convex portions 121 which are continuously disposed in the first direction m and are bent by the conductive sheet 10, and the protruding direction of the convex portion 121 is The angle between the first directions m is 90°, and the convex directions of the adjacent two protrusions 121 are opposite, so that the electrical connection assembly 1 can effectively absorb the electrical connection between the electrical connection assembly 1 and the poles of the unit cells 3. Or the vibration impact force during welding with the module output pole 2, the electrical connection component 1 and the module output pole 2 are usually connected by ultrasonic lap welding. The direction of the ultrasonic welding vibration impact force is the x direction, and the force F in the x direction passes through the three convex portions 121 in sequence, and the three convex portions 121 are contracted and deformed in the x direction, so that a part of the vibration impact force can be absorbed, and The maximum fatigue damage value of the welding to the electrical connection component 1 is greatly reduced, and the electrical connection component 1 is effectively prevented from being cracked.

Moreover, when the electrical connection component 1 is soldered to the pole of the single cell 3, or when the single cell is charged and discharged, the deformation of each convex portion 121 of the vibration absorbing region 12 can be effectively absorbed from the single cell 3. The expansion force in the x direction prevents the electrical connection assembly 1 from cracking. At the same time, the convex space of each convex portion 121 can be utilized to absorb the height difference in the y direction between the unit cells 3 connected to the electrical connection assembly 1, and the electrical connection assembly 1 and the laser penetration welding are ensured tightly. Fit to prevent the occurrence of solder joint problems and ensure the reliability of electrical connections. The convex portions 121 of the vibration absorbing region 12 are continuously disposed to have better vibration absorbing capability, and at the same time, it is possible to avoid stress concentration when the electrical connection assembly 1 is stressed, and to better avoid cracking of the electrical connection assembly 1.

Similarly, in order to avoid stress concentration between the vibration absorption zone 12 and the connection zone 11, as an alternative embodiment, the vibration absorption zone 12 and the connection zone 11 are connected by a circular arc transition zone 13.

In this embodiment, the number of the protrusions 121 is three, but is not limited to three, and may be four or more. Of course, the number of the protrusions 121 is preferably an odd number, as in this embodiment. The three, so that the vibration absorption zone 12 as a whole has a symmetrical structure.

Optionally, the raised portion 121 includes a central raised portion 121a at a central position of the vibration absorbing region 12 and a side raised portion 121b symmetrically distributed on both sides of the central raised portion 121a. The vibration absorbing region 12 preferably adopts an odd number of convex portions 121, that is, a symmetrical structure thereof, which can make the electrical connection assembly 1 more uniformly subjected to the welding force and the expansion force, and further avoid the cracking of the electrical connection assembly 1.

As an alternative embodiment, the opening width of the central convex portion 121a in the first direction m is larger than the opening width of the side convex portion 121b in the first direction m, and the vibration absorbing capability of the vibration absorbing region 12 can be effectively improved. Preferably, the convex height of the central convex portion 121a is larger than the convex height of the side convex portion 121b. The vibration absorbing region 12 has the above configuration, and the vibration absorbing capability of the vibration absorbing region 12 can be further improved.

Of course, it is not limited to the above form. In an alternative embodiment, the convex height of the central convex portion 121a may also be equal to the convex height of the side convex portion 121b. The processing is convenient on the basis of satisfying the vibration absorption requirement, the occupied space of the entire electrical connection assembly can be reduced, and the electrical connection assembly 1 is less prone to cracking.

Through simulation analysis, as an alternative embodiment, the width of the vibration absorbing region 12 along the first direction m, that is, the sum of the opening widths of the respective convex portions 121 is more than twice the convex height of the central convex portion 121a. In the above form, not only the vibration absorbing effect of the vibration absorbing region 12 can be improved, but also the thinning rate requirement of the electrical connection assembly 1 when bending the vibration absorbing region 12 can be satisfied, and the space requirement for application to the battery module can be satisfied. Improve the energy density of the battery module.

When the opening width of the central convex portion 121a in the first direction m is larger than the opening width of the side convex portion 121b in the first direction m, and/or, the convex height of the central convex portion 121a is larger than the side convex portion 121b When the height of the electrical connection assembly 1 is applied to the battery module, the protruding direction of the central convex portion 121a is limited due to space requirements, and in order to prevent the electrical connection assembly 1 from being connected to the corresponding single battery unit 3 When the pole is reversed, it is preferable to provide the foolproof mark 14 on the connecting area 11. The foolproof mark 14 in this embodiment is a notch provided on the connecting area 11, so as to be recognized by the operator, or correspondingly The positioning plate cooperates to properly connect the electrical connection assembly 1 to the battery module. Of course, the foolproof mark 14 is not limited to the form of a notch. In some optional embodiments, the convex portion, the concave portion, the character, or the like provided on the connecting portion 11 may be used. In combination, as long as the auxiliary operator can be satisfied, the electrical connection component 1 can be prevented from being reversed.

The electrical connection assembly 1 of the embodiment shown in FIG. 1 includes only two connection areas 11 and one vibration absorption area 12. Of course, the electrical connection assembly 1 of the embodiment of the present application is not limited to the form shown in FIG. FIG. 5 shows a schematic structural view of an electrical connection assembly 1 of another embodiment of the present application. This embodiment is basically the same as the embodiment of the embodiment shown in FIG. 1 , except that the present embodiment includes four connection regions 11 spaced along the first direction m, and each of the four connection regions 11 is adjacent. The two connection areas 11 are connected by a vibration absorption area 12, and the electrical connection component 1 in this embodiment can be simultaneously connected to the poles of the four single cells 3, in different forms of the single battery 3 satisfying the battery module. On the basis of series or parallel requirements, it also has better vibration absorption requirements, high fatigue strength and is not easy to crack. Thus, the number of the connection regions 11 and the number of the vibration absorption regions 12 are not limited to those shown in FIGS. 1 and 5, and may be changed according to the series or parallel requirements of the unit cells 3 of the battery module.

The electrical connection components 1 shown in the above embodiments all include a conductive sheet 10. Of course, in order to meet the overcurrent requirement when the electrical connection component 1 is applied to the battery module, it is not limited to including only one layer of the conductive sheet 10. In some optional embodiments, two conductive sheets 10 may be included. Please refer to FIG. 6 and FIG. 7 together. FIG. 6 shows a schematic structural view of an electrical connection assembly 1 according to still another embodiment of the present application. FIG. A front view of the electrical connection assembly 1 shown in Fig. 6. In this embodiment, the two conductive sheets 10 are disposed, and the two conductive sheets 10 are stacked in the protruding direction of the convex portion 121, which can increase the over-flow requirement of the electrical connection assembly 1 and also have a corresponding vibration absorption effect.

As an alternative embodiment, the two conductive sheets 10 are of a unitary structure, and can be formed by bending the same conductive sheet. The vibration absorbing regions 12 of the two conductive sheets 10 are fitted to each other, that is, the vibration absorbing regions 12 of the two conductive sheets 10. The protruding directions of the protruding portions 121 are identical to each other and are fastened together, thereby better improving the vibration absorbing capability between the two conductive sheets 10 while saving the space occupied by the electrical connection assembly 1.

Of course, the electrical connection component 1 shown in FIG. 6 and FIG. 7 is only an example for satisfying the over-flow requirement, and is not limited to including two conductive sheets 10. In specific implementation, three or more layers may be used according to the over-flow requirement. The width of the conductive sheet 10 and the conductive sheet 10 are not particularly limited, and the width of each of the conductive sheets 10 may be equal or unequal as long as the over flow rate requirement and the vibration absorption requirement can be satisfied.

Please refer to FIG. 8. FIG. 8 is a partial structural diagram of a battery module according to an embodiment of the present application. The embodiment of the present application further provides a battery module including a plurality of single cells 3, a module output pole 2, and the electrical connection assembly 1 of the above embodiments. The plurality of single cells 3 are connected in series or in parallel through the electrical connection assembly 1. The module output pole 2 is electrically connected to the unit battery 3 as the output or input end of the battery module through the electrical connection assembly 1.

The battery module provided by the embodiment of the present invention has the vibration-absorbing capability, is not easy to be damaged, has stable input or output power, has a long service life, and has good safety performance. Easy to promote.

Although the present application has been described with reference to the preferred embodiments, various modifications may be made thereto and the components may be replaced with equivalents without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

An electrical connection assembly (1) for a battery module comprising at least one conductive sheet (10), wherein the conductive sheet (10) comprises a connection region spaced apart in a first direction (m) (11) And a vibration absorbing zone (12) connected between each adjacent two of said connecting zones (11);

The vibration absorption region (12) includes a plurality of protrusions (121) continuously disposed along the first direction (m) and bent by the conductive sheet (10), the protrusions (121) a convex direction intersecting the first direction (m) and oppositely protruding directions of two adjacent convex portions (121);

The convex portion (121) includes a central convex portion (121a) located at a center position of the vibration absorption region (12) and a side convex portion (121b) distributed on both sides of the central convex portion (121a) The opening width of the center convex portion (121a) in the first direction (m) is larger than the opening width of the side convex portion (121b) in the first direction (m).
The electrical connection assembly (1) according to claim 1, wherein the vibration absorbing zone (12) is connected to the connection zone (11) by a circular arc transition zone (13).
The electrical connection assembly (1) according to claim 1, wherein said convex portion (121) is formed to extend through said conductive sheet (10) in a width direction (n) of said conductive sheet (10) Strip-shaped bumps.
The electrical connection assembly (1) according to claim 1, wherein the number of the convex portions (121) is an odd number, and the side convex portions (121b) are symmetrically distributed to the central convex portion ( Both sides of 121a).
The electrical connection assembly (1) according to claim 1, wherein a convex height of the central convex portion (121a) is greater than or equal to a convex height of the side convex portion (121b).
The electrical connection assembly (1) according to claim 5, wherein a width of said vibration absorbing region (12) along said first direction (m) is said convex height of said central convex portion (121a) More than twice.
The electrical connection assembly (1) according to claim 1, wherein the connection area (11) is provided with a foolproof mark (14), and the foolproof mark (14) is a convex part, a concave part, a notch or a text. One or a combination of two or more.
The electrical connection assembly (1) according to any one of claims 1 to 7, wherein the number of layers of the conductive sheet (10) is two or more, and two or more layers of the conductive sheet (10) are along the convex Stacked in the outbound direction.
The electrical connection assembly (1) according to claim 8, wherein the two or more conductive sheets (10) are of a unitary structure, and the vibration absorbing regions (12) of the two adjacent conductive sheets (10) are adjacent. Interfit each other.
A battery module comprising a plurality of single cells (3), a module output pole (2), and an electrical connection assembly (1) according to any one of claims 1 to 9, a plurality of said single The body battery (3) is connected in series or in parallel through the electrical connection component (1) through the electrical connection component (1) and the said output or input terminal of the battery module The unit cells (3) are electrically connected.