WO2024027300A1

WO2024027300A1 - Multifunctional busbar and prismatic battery

Info

Publication number: WO2024027300A1
Application number: PCT/CN2023/096581
Authority: WO
Inventors: 陈景葱
Original assignee: 惠州亿纬锂能股份有限公司
Priority date: 2023-03-27
Filing date: 2023-05-26
Publication date: 2024-02-08
Also published as: CN219436081U

Abstract

A multifunctional busbar, and a prismatic battery comprising a multifunctional busbar. In the multifunctional busbar, a first stacking connector (1) comprises first elastically deformable members (11) and first connectors (12), the plurality of first connectors (12) being arranged at intervals in an X direction, any two adjacent first connectors (12) being connected by means of the first elastically deformable members (11), and the first connectors (12) being configured to be connected to first cell modules (100); a second stacking connector (2) comprises second elastically deformable members (21) and second connectors (22), the plurality of second connectors (22) being arranged at intervals in the X direction, any two adjacent second connectors (22) being connected by means of the second elastically deformable members (21), and the second connectors (22) being configured to be connected to a second cell module (200); each first elastically deformable member (11) is provided with a first notch (13), and each second elastically deformable member (21) is provided with a second notch (23); and the first stacking connector (1) and the second stacking connector (2) are arranged at an interval in a Y direction, and the first stacking connector (1) is connected to the second stacking connector (2) by means of a third elastically deformable member (3), the Y direction being perpendicular to the X direction.

Description

Multifunctional busbar and prismatic battery

This application claims priority to the Chinese patent application with application number 202320616834.X filed with the China Patent Office on March 27, 2023. The entire content of the above application is incorporated into this application by reference.

Technical field

This application relates to the field of battery technology, for example, to a multifunctional busbar and a prismatic battery.

Background technique

Power battery packs are required to have a regular shape. Among them, square case power battery modules are the most popular because they are easy to install on the frame or luggage. The busbar is a part of the power battery and is used to connect square case power battery modules in series. For adjacent battery modules, the current bus only has a single arch bridge design in the stacking direction of the battery modules. This design has the following defects:

1. The aluminum bus bar between battery cell modules arranged in parallel cannot absorb the expansion of the battery module in the parallel direction, resulting in desoldering between the battery poles and the bus bar. The parallel direction is perpendicular to the stacking direction. .

2. The single-arch bridge design has extremely high requirements for the flatness between the two battery modules in the stacking direction. Insufficient flatness of the battery poles of the two battery modules will lead to friction between the battery poles and the busbar. Desoldering.

For this reason, there is an urgent need to study a multi-functional bus bar to improve the desoldering between the battery poles and the bus bar.

Contents of the invention

This application provides a multifunctional busbar and a square battery to improve the situation of virtual soldering and desoldering between the battery poles and the busbar.

In a first aspect, embodiments of the present application provide a multifunctional bus, which includes:

A first stacked connector, the first stacked connector includes a first elastic deformation part and a first connecting part, a plurality of the first connecting parts are spaced apart along the X direction, and any two adjacent first connecting parts The connecting parts are connected through the first elastic deformation part, and the first connecting part is used to connect the first battery module;

A second stacked connector. The second stacked connector includes a second elastic deformation portion and a second connecting portion. A plurality of the second connecting portions are spaced apart along the X direction, and any two adjacent second connecting portions are The connecting parts are connected through the second elastic deformation part, and the second connecting part is used to connect the second battery core module;

The first elastic deformation part is provided with a first gap, and the second elastic deformation part is provided with a second gap;

In the third elastic deformation part, the first stacking connector and the second stacking connector are spaced apart along the Y direction and connected through the third elastic deformation part, and the X direction is perpendicular to the Y direction.

In one embodiment, the first elastic deformation part has an arch structure, and the second elastic deformation part has an arch structure.

In one embodiment, the opening direction of the first elastic deformation part is the same as the opening direction of the second elastic deformation part.

In one embodiment, the first elastic deformation part and the second elastic deformation part are connected.

In one embodiment, the opening direction of the first notch is away from the second stacking connector, and the opening direction of the second notch is away from the first stacking connector.

In one embodiment, the first connection part is provided with a first connection hole, and the first connection part is connected to the first battery module through the first connection hole; the second connection part is provided with There is a second connection hole, and the second connection part is connected to the second battery module through the second connection hole.

In one embodiment, at least one of the first connection hole and the second connection hole is a strip hole extending along the X direction.

In one embodiment, the first stacked connector includes two first connecting parts, the second stacked connecting piece includes two second connecting parts, the first elastic deformation part, the The second elastic deformation part and the third elastic deformation part intersect to form a cross arch bridge.

In one embodiment, the third elastic deformation part has an arched structure.

In a second aspect, embodiments of the present application provide a prismatic battery, including a battery string and a multi-functional busbar in any of the above solutions. The battery string includes a first battery cell module and a second battery module arranged in a matrix. .

The beneficial effects of this application are:

The present application provides a multifunctional busbar and a prismatic battery. The multifunctional busbar is provided with a first stacking connector and a second stacking connector, wherein the first stacking connector includes two first stacking connectors spaced apart along the X direction. The connection part, the two first connection parts are connected through the first elastic deformation part to adapt to the expansion amount between the two first battery modules along the X direction; the second stacked connection part includes two spaced apart parts along the X direction The second connection part, the two second connection parts are connected through the second elastic deformation part to adapt to the expansion amount between the two second battery modules arranged along the X direction; the third elastic deformation part is connected along the The first stacked connector and the second stacked connector are spaced apart in the Y direction to adapt to the expansion amount between the first battery module and the second battery module arranged in the Y direction; by forming the first elastic deformation part A first gap is opened, and a second gap is opened in the second elastic deformation part to adapt to the flatness difference of the battery poles of the two first battery modules arranged along the X direction and the two first battery modules arranged along the X direction. The difference in flatness of the cell poles of the second cell module. The above arrangement improves the situation of virtual soldering and desoldering between the battery pole and the bus bar.

Description of drawings

Figure 1 is a schematic structural diagram of a multi-function bus from a first perspective according to an embodiment of the present application;

Figure 2 is a schematic structural diagram of a multi-functional bus from a second perspective according to an embodiment of the present application;

Figure 3 is a schematic structural diagram of a multi-functional bus from a third perspective according to an embodiment of the present application;

Figure 4 is a schematic structural diagram of a prismatic battery in an embodiment of the present application;

Figure 5 is a partial structural diagram of a prismatic battery in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a multi-function bus from a first perspective in another embodiment of the present application.

In the picture:
100. The first battery module; 200. The second battery module;
1. The first stacked connecting piece; 11. The first elastic deformation part; 12. The first connecting part; 121. The first connecting hole; 13. The first gap;
2. The second stacked connecting piece; 21. The second elastic deformation part; 22. The second connecting part; 221. The second connecting hole; 23. The second gap;
3. The third elastic deformation part; 33. The third gap.

Detailed ways

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. 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, and the first feature "on", "above" and "above" the second feature include the first feature on the second feature. Directly above and diagonally above, or simply means that the level of the first feature is higher than that of the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis.

Embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application.

As shown in Figures 1-5, this embodiment provides a multi-functional bus bar, which includes a first stack connector 1, a second stack connector 2 and a third elastic deformation part 3, wherein the first The stacked connector 1 includes a first elastic deformation part 11 and a first connection part 12. A plurality of first connection parts 12 are spaced apart along the X direction, and any two adjacent first connection parts 12 are separated by the first elastic deformation. The first connection part 12 is configured to connect the first battery module 100; the second stack connector 2 includes a second elastic deformation part 21 and a second connection part 22, and a plurality of second connection parts 22 are arranged along the X direction are arranged at intervals, and any two adjacent second connection parts 22 are connected by the second elastic deformation part 21, and the second connection part 22 is configured to connect the second battery module 200; the first elastic deformation part 11 is provided with The first gap 13 and the second elastic deformation part 21 are provided with a second gap 23; the first stacking connector 1 and the second stacking connector 2 are spaced apart along the Y direction and connected by the third elastic deformation part 3, and the X direction is vertical in the Y direction.

In this multi-functional busbar, the first stacked connector 1 includes two first connecting parts 12 spaced apart along the X direction. The two first connecting parts 12 are connected by a first elastic deformation part 11 to adapt to the The amount of expansion between the two first battery modules 100; the second stacked connector 2 includes two second connection parts 22 spaced apart along the X direction, and the two second connection parts 22 pass through the second elastic deformation part 21 connection to adapt to the expansion amount between the two second battery core modules 200 arranged along the Part 2 to adapt to the expansion amount between the first battery module 100 and the second battery module 200 arranged along the Y direction; by adapting to the expansion amount in the X direction and the Y direction, the multi-functional bus and the battery are improved The situation of virtual soldering and desoldering between core modules improves the reliability, stability and durability of the product. The first notch 13 is formed in the first elastic deformation part 11 and the second notch 23 is formed in the second elastic deformation part 21 to accommodate the battery poles of the two first battery modules 100 arranged along the X direction. The difference in flatness and the difference in flatness of the battery poles of the two second battery modules 200 arranged along the X direction.

The first elastic deformation part 11 has an arch structure, and the second elastic deformation part 21 has an arch structure. In other embodiments, the first elastic deformation part 11 has a wavy structure, and the second elastic deformation part 21 has a wavy structure. The specific number of waves can be determined according to the number of the two adjacent first battery modules 100 in the stacking direction. Determine the size of the gap between them.

For ease of understanding, in this embodiment, the first elastic deformation part 11 and the second elastic deformation part 21 are described as having an arched structure.

The opening direction of the first elastic deformation part 11 is the same as the opening direction of the second elastic deformation part 21 . For example, the opening direction of the first elastic deformation part 11 is away from the first battery module 100 , and the opening direction of the second elastic deformation part 21 is away from the second battery module 200 . In other words, the first elastic deformation part 11 projects toward the gap between two adjacent first battery core modules 100 , and the second elastic deformation part 21 projects toward the gap between two adjacent second battery core modules 200 . gap. This arrangement ensures that the arched structure does not increase the height of the power battery. With the arrangement of the above structure, when the multi-functional busbar and the battery module are connected, the elastic deformation parts can be located in the gaps between adjacent battery modules without increasing the height of the battery.

In order to facilitate elastic deformation, in this embodiment, the cross-sectional shape of the first elastic deformation part 11 is an arc-shaped groove structure; the cross-sectional shape of the second elastic deformation part 21 is an arc-shaped groove structure. In other embodiments, the cross-sectional shape of the first elastic deformation part 11 is a square groove structure; the cross-sectional shape of the second elastic deformation part 21 is It is a square trough-shaped structure.

The first elastic deformation part 11 and the second elastic deformation part 21 are connected. This setting can adapt to the cross-shaped gaps formed by multiple battery core modules and is easy to process. In addition, the connected first elastic deformation part 11 and the second elastic deformation part 21 are beneficial to increasing the overall strength.

Regarding the opening directions of the first notch 13 and the second notch 23 , in this embodiment, the opening direction of the first notch 13 is away from the second stacking connector 2 , and the opening direction of the second notch 23 is away from the first stacking connector 1 . That is, the opening directions of the first gap 13 and the second gap 23 are arranged in opposite directions. In other embodiments, the opening directions of the first notch 13 and the second notch 23 may also be arranged oppositely. Wherein, the length of the first notch 13 along the X direction is a1, the length of the first connecting portion 12 along the X direction is b1, c1=a1/b1, 0.9≥c1≥0.5. The length of the second notch 23 along the X direction is a2, and the length of the first connecting portion 12 along the X direction is b2, c2=a2/b2, 0.9≥c2≥0.5.

In order to facilitate welding, in this embodiment, the first connection part 12 is provided with a first connection hole 121, and the first connection part 12 is connected to the first battery module 100 through the first connection hole 121; the second connection part 22 is provided with The second connection hole 221 , the second connection part 22 is connected to the second battery module 200 through the second connection hole 221 .

Due to the accumulation of tolerances in the stacking direction of the battery cells, at least one of the first connection hole 121 and the second connection hole 221 cannot be aligned with the battery pole hole of the first battery module 100 , resulting in weak soldering or even failure. In this case, in this embodiment, at least one of the first connection hole 121 and the second connection hole 221 is a strip hole extending along the X direction. Exemplarily, both the first connection hole 121 and the second connection hole 221 are strip holes extending along the X direction. The above settings improve the compatibility and adaptability of the multi-function bus.

It should be noted that connecting the first connection part 12 and the battery pole at the first connection hole 121 is well known to those skilled in the art, and connecting the second connection part 22 and the battery pole at the second connection hole 221 is Those skilled in the art are familiar with it, and the specific connection method will not be described again here.

In this embodiment, the first stacked connector 1 includes two first connecting parts 12 , the second stacked connecting part 2 includes two second connecting parts 22 , the first elastic deformation part 11 , the second elastic deformation part 21 and the second elastic deformation part 21 . The three elastic deformation parts 3 intersect to form a cross arch bridge. Exemplarily, the first elastic deformation part 11, the second elastic deformation part 21 and the third elastic deformation part 3 intersect to form a cross arch bridge, and the first elastic deformation part 11 and the second elastic deformation part 21 are located separately in the third elastic deformation part. 3 sides. In other embodiments, the first stacking connector 1 may include three, four or even ten first connecting parts 12 , and the second stacking connector 2 may include three, four or even ten second connecting parts 22 . The specific number can be set according to the number and arrangement of the first battery module 100 and the second battery module 200 .

The third elastic deformation part 3 has an arched structure. In other embodiments, the third elastic deformation part 3 may be wavy, and the specific number of waves may be determined according to the size of the gap between the first battery module 100 and the second battery module 200 in the parallel direction.

In one embodiment, referring to FIG. 6 , a third gap 33 is opened at at least one end of the third elastic deformation part 3 . For example, third gaps 33 are opened at both ends of the third elastic deformation part 3 . The arrangement of the third gap 33 can adapt to the flatness difference between the battery poles of the two adjacent first battery modules 100 and the second battery module 200 in the parallel direction. The difference in flatness refers to the difference in the flatness of the first battery cell module 100 The top surface of the core pole and the top surface of the cell pole of the second battery module 200 are not coplanar.

In this embodiment, the first stacking connector 1, the second stacking connector 2 and the third elastic deformation part 3 are integrally formed. The first elastic deformation part 11, the second elastic deformation part 21 and the third elastic deformation part 3 are prepared through a stamping process, which has the advantages of high precision, good stability and high surface quality.

The multi-function bus is made of aluminum. For example, the material of the multi-function bus is AL1060-O state (a state of the aluminum plate. O is the annealed state, that is, a fully soft state, which is suitable for processing with the lowest strength after complete annealing. product), has high elongation and tensile strength.

The stacking direction is the X direction, and the juxtaposition direction is the Y direction. The power battery is composed of a first battery module 100 and a second battery module 200 arranged in a matrix.

As shown in FIG. 4 and FIG. 5 , this embodiment also provides a prismatic battery, including a battery string and the multi-functional busbar in the above solution. The battery string includes a first battery cell module 100 and a second battery cell arranged in a matrix. Mod 200. Among them, there are two first battery core modules 100 and two second battery core modules 200 respectively. The two first battery core modules 100 are stacked along the X direction to form the first assembly. The two second battery core modules 200 The second component is stacked along the X direction, and the first component and the second component are juxtaposed along the Y direction to form a battery string.

Claims

Multifunctional busbars, including:

A first stacked connector (1), the first stacked connector (1) includes a first elastic deformation portion (11) and a first connecting portion (12), a plurality of the first connecting portions (12) along the The first connecting parts (12) are arranged at intervals in the direction, and any two adjacent first connecting parts (12) are connected by the first elastic deformation part (11), and the first connecting parts (12) are configured to connect the first electrical coremodule(100);

A second stacked connector (2). The second stacked connector (2) includes a second elastic deformation portion (21) and a second connecting portion (22). A plurality of the second connecting portions (22) are arranged along X direction, and any two adjacent second connecting parts (22) are connected through the second elastic deformation part (21), and the second connecting part (22) is configured to connect a second electrical core module(200);

The first elastic deformation part (11) is provided with a first gap (13), and the second elastic deformation part (21) is provided with a second gap (23);

A third elastic deformation part (3), the first stack connection part (1) and the second stack connection part (2) are spaced apart along the Y direction and connected through the third elastic deformation part (3), The X direction is perpendicular to the Y direction.
The multifunctional busbar according to claim 1, wherein the first elastic deformation part (11) has an arched structure, and the second elastic deformation part (21) has an arched structure.
The multifunctional busbar according to claim 2, wherein the opening direction of the first elastic deformation part (11) is the same as the opening direction of the second elastic deformation part (21).
The multifunctional busbar according to claim 3, wherein the first elastic deformation part (11) and the second elastic deformation part (21) are connected.
The multifunctional busbar according to claim 1, wherein the opening direction of the first notch (13) is away from the second stacked connector (2), and the opening direction of the second notch (23) is away from the second stacked connector (2). The first stacked connector (1).
The multifunctional busbar according to any one of claims 1 to 5, wherein the first connection part (12) is provided with a first connection hole (121), and the first connection part (12) passes through the The first connection hole (121) is connected to the first battery module (100); the second connection part (22) is provided with a second connection hole (221), and the second connection part (22) passes through The second connection hole (221) is connected to the second battery module (200).
The multifunctional busbar according to claim 6, wherein at least one of the first connection hole (121) and the second connection hole (221) is a strip hole extending along the X direction.
The multi-functional busbar according to any one of claims 1 to 5, wherein the first stack connection part (1) includes two first connection parts (12), and the second stack connection part (12) 2) It includes two second connecting parts (22), and the first elastic deformation part (11), the second elastic deformation part (21) and the third elastic deformation part (3) intersect to form a cross. arch bridge.
The multifunctional busbar according to any one of claims 1 to 5, wherein the third elastic shape The changing part (3) has an arched structure.
Prismatic battery, including a battery string and the multifunctional bus according to any one of claims 1 to 9, the battery string including a first battery cell module (100) and a second battery cell module (200) arranged in a matrix .