WO2023103408A1

WO2023103408A1 - Information acquisition apparatus for battery module, and battery module

Info

Publication number: WO2023103408A1
Application number: PCT/CN2022/108463
Authority: WO
Inventors: 马进司
Original assignee: 湖北亿纬动力有限公司
Priority date: 2021-12-09
Filing date: 2022-07-28
Publication date: 2023-06-15
Also published as: CN217589078U

Abstract

Disclosed in the present application are an information acquisition apparatus for a battery module, and a battery module. The information acquisition apparatus for a battery module comprises an insulating support and a flexible circuit board, wherein the flexible circuit board is folded into a U-shaped strip; two extensions of the U-shaped strip are arranged in a first direction and are mounted on the insulating support; and the flexible circuit board is in a strip shape during unfolding, and is configured to acquire cell information. The battery module comprises the information acquisition apparatus for a battery module.

Description

Battery module information collection device and battery module

This application claims the priority of a Chinese patent application with application number 202123079404.9 filed with the China Patent Office on December 09, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of battery technology, for example, to a battery module information collection device and a battery module.

Background technique

Flexible Printed Circuit (FPC) is a highly reliable flexible printed circuit board made of polyimide or polyester film as the base material. In related technologies, most of the voltage and temperature signals of the battery module are collected in the form of arranging multiple flexible circuit boards or wiring in the middle of the battery module. Using the above method makes the space utilization rate of the wiring in the middle of the battery module not high, and at the same time It will increase the raw material cost of the flexible circuit board.

Contents of the invention

The application provides a battery module information collection device and a battery module, which are simple in structure, easy to produce, reduce waste of raw material costs, and have a high space utilization rate of the battery module.

The present application provides a battery module information collection device, which includes an insulating support and a flexible circuit board, the flexible circuit board is folded into a U-shaped strip, and the two extension sections of the U-shaped strip are arranged along the first direction and set up on the On the insulating support, the flexible circuit board is strip-shaped when unfolded, and the flexible circuit board is configured to collect battery information.

The present application provides a battery module, including a plurality of battery cells and the battery module information collection device described in any one of the above technical solutions.

Description of drawings

The following will briefly introduce the drawings that need to be used in the description of the embodiments of the present application.

FIG. 1 is a schematic structural diagram of a battery module information collection device provided in an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a flexible circuit board provided by an embodiment of the present application;

Fig. 3 is an enlarged view of part A in Fig. 1;

Fig. 4 is a schematic structural diagram of a battery module provided by an embodiment of the present application.

In the picture:

1. Insulation bracket; 10. Avoidance hole; 11. First hot riveting post; 12. Second hot riveting post; 2. Flexible circuit board; 21. First section; 22. Second section; 23. Transition section; 24 , the first folding part; 25, the second folding part; 26, the connecting section; 27, the waist hole;

3. Reinforcing plate; 4. Confluence piece; 5. Acquisition piece; 6. Low-voltage connector; 7. Positive lead-out piece; 8. Negative lead-out piece; 9. Temperature sensor;

100, electric core; 101, pole end.

Detailed ways

The application will be described below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are used to explain the present application. In addition, it should be noted that, for the convenience of description, only some structures related to the present application are shown in the drawings but not all structures.

In the description of this application, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or a Electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those skilled in the art can understand the meanings of the above terms in this application according to the actual situation.

In this application, a first feature being "on" or "under" a second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but pass between them. additional feature contacts. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "left", "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations. It does not indicate or imply that the referred device or element has a particular orientation, is constructed, or operates in a particular orientation. In the description of the present application, unless otherwise specified, "plurality" means two or more. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

As shown in Figures 1 to 3, this embodiment provides a battery module information collection device, the battery module information collection device includes an insulating support 1 and a flexible circuit board 2, the flexible circuit board 2 is folded into a U-shaped strip, and the U-shaped The two extensions of the shaped strip are arranged along the first direction and are erected on the insulating support 1 , and the flexible circuit board 2 is strip-shaped when unfolded. By folding the strip-shaped flexible circuit board 2 into a U-shaped strip, and placing the two extension ends of the U-shaped strip on the insulating support 1 along the first direction, the waste of raw materials of the flexible circuit board 2 can be greatly saved. That is, a complete flexible circuit board 2 raw material can be completely divided into multiple flexible circuit boards 2, so that the utilization rate of raw materials is maximized; folded into a U-shaped strip so that the flexible circuit board 2 mounted on the insulating support 1 has two interconnected The conductive circuit is convenient for subsequent assembly into the battery module, and realizes the function of the battery module information collection device in the battery module.

Optionally, as shown in Figure 1, a plurality of avoidance holes 10 are provided on the insulating support 1 to meet the internal structure of the battery module, so that the applicability of the battery module information collection device is high; at the same time, it can also play a role To achieve a certain heat dissipation effect, avoid the formation of a nearly sealed environment between the battery module and the battery module information collection device, improve heat dissipation efficiency; and also reduce the weight of the insulating support 1 and increase the energy density of the battery module. Exemplarily, a plurality of escape holes 10 are arranged at intervals along the first direction. In an embodiment, the number, distribution position, shape and size of the avoidance holes 10 can be designed according to actual conditions. Optionally, the insulating support 1 is a plastic support, which is low in cost, good in insulating effect, light in weight, and improves the energy density of the battery module.

In one embodiment, as shown in FIG. 2 , the flexible circuit board 2 includes a first section 21, a second section 22 and a transition section 23, the first section 21 and the second section 22 are connected through the transition section 23, and the first section 21 Extended along the first direction and form a first folded portion 24 at the connection with the first end of the transition section 23, the second section 22 is arranged along the first direction and formed at the connection with the second end of the transition section 23 The second folding part 25 . That is, the strip-shaped flexible circuit board 2 is U-shaped after being folded twice, and a first folded portion 24 and a second folded portion 25 are formed at the place of the folded twice. In one embodiment, the first folded portion 24 includes a stacked first plane and a second plane, the two ends of the first plane are respectively connected to the first segment 21 and the first end of the second plane, and the second end of the second plane is Connect the first end of transition section 23; The second end is connected to the second end of the transition section 23 . Under the above structure, not only is the operation convenient and the structure is simple, but also the waste of raw materials can be greatly reduced, the cost can be saved, and the economic benefit can be improved.

Optionally, the angle between the transition section 23 and the first section 21 is 90°, and the angle between the transition section 23 and the second section 22 is also 90°. That is, the U-shaped flexible circuit board 2 has a regular structure, making the battery module information collection device compact and regular, improving the aesthetics of the appearance and reducing the occupied space. In an embodiment, the angle between the transition section 23 and the first section 21 and the angle between the transition section 23 and the second section 22 can be set according to actual conditions, for example, avoidance settings can be made according to the internal structure of the battery module.

Optionally, the insulating bracket 1 is provided with a first heat rivet post 11 , and the flexible circuit board 2 is provided with a waist-shaped hole 27 , and the flexible circuit board 2 is connected with the first heat rivet post 11 through the waist-shaped hole. In one embodiment, the first segment 21 and the second segment 22 are provided with a plurality of waist-shaped holes 27, and the waist-shaped holes 27 are connected with a plurality of first heat riveting posts 11 on the insulating support 1 one by one to realize the first The fixing of the first section 21 and the second section 22; the setting of the waist-shaped hole 27 can effectively absorb the expansion force of the battery module during the collection process of the battery module, reduce the force on the body of the flexible circuit board 2, thereby improving the flexibility of the flexible circuit board 2. service life and the safety of the battery module. In this embodiment, the hot riveting connection can enhance the connection stability of the first section 21 and the second section 22, facilitate the positioning during connection, improve the accuracy of position connection, and the operation convenience is high, which is conducive to industrial batch production Production.

In one embodiment, as shown in FIG. 1, the battery module information collection device further includes a reinforcing plate 3, the reinforcing plate 3 is arranged at one end of the insulating support 1, the transition section 23 is located on the reinforcing plate 3, the first Both the folded portion 24 and the second folded portion 25 are connected to the reinforcing plate 3 . In this embodiment, the reinforcing plate 3 is set to fixedly support the first folding part 24 and the second folding part 25 and the transition section 23 between them, so that the connection of the flexible circuit board 2 is stable, and it is convenient for the subsequent battery module information collection device to be assembled on the battery. in the mod. Optionally, the relative position between the reinforcing plate 3 and the insulation can be set according to the internal space of the battery module, so as to adapt to the internal structure of the battery module and improve the energy density of the battery module.

In this embodiment, the flexible circuit board 2 is also provided with a low-voltage connector 6, which is located in the transition section 23 and is configured to collect the voltage of the battery module.

Optionally, the first folded portion 24 and the second folded portion 25 are respectively connected to the reinforcing plate 3 through rivet buckles, so as to enhance the connection stability of the first folded portion 24 and the second folded portion 25 and provide high operational convenience.

In one embodiment, as shown in Figure 1 and Figure 3, the battery module information collection device further includes a plurality of busbars 4 and a plurality of collection pieces 5, and the plurality of busbars 4 are arranged in two rows on the insulating support 1, each row of busbars 4 is arranged along the first direction, the flexible circuit board 2 is located between two rows of busbars 4, and the busbars 4 are set as at least one of series and parallel batteries; each collection piece 5 The two ends are respectively connected to a bus 4 and a flexible circuit board 2 . The battery cells can be connected in series through the busbar 4, or connected in parallel through the busbar 4, and the connection between the flexible circuit board 2 and the busbar 4 can be realized through the collection piece 5, that is, the cell information can be collected through the collection piece 5 and Delivered to the flexible circuit board 2. Optionally, the first segment 21, the second segment 22, the first row of bus bars 4 and the second row of bus bars 4 are arranged side by side at intervals, and the first segment 21 and the second segment 22 are located between the two rows of bus bars 4, It facilitates the connection of the collection sheet 5 with the first section 21 and the bus sheet 4 on the corresponding side, shortens the size of the collection sheet 5, thereby reducing the risk of fracture and saving materials.

In this embodiment, the collection sheet 5 and the bus sheet 4 are connected by soldering, which is easy to operate and low in cost; the collection sheet 5 and the flexible circuit board 2 are welded by laser, and laser welding can improve the connection between the collection sheet 5 and the flexible circuit board 2 Accuracy, improve collection accuracy. Optionally, the collection sheet 5 is a nickel sheet, which has good electrical performance and better corrosion resistance.

Optionally, a second thermal rivet post 12 is further arranged on the insulating support 1 , and each busbar 4 is connected to at least one second thermal rivet post 12 by thermal rivet. The connection stability of the busbar 4 is enhanced. After the busbar 4 is welded, the movable gap of the insulating support 1 can be effectively eliminated, and the force deformation of the plastic upper cover can be reduced. Optionally, the bus bar 4 is an aluminum bar, which is light in weight and has good electrical performance.

In order to reduce the risk of desoldering or breakage of the collection piece 5 caused by the vibration or expansion of the battery module during the collection process of the battery module, the first section 21 and the second section 22 are respectively provided with a plurality of recesses on the side close to the bus bar 4 of the corresponding row. The first side wall of the groove protrudes toward the second side wall, and a connecting section 26 is provided, and the two ends of the collection sheet 5 are respectively connected to the bus sheet 4 and the connecting section 26 . That is, there is a gap between the connecting section 26 and the first section 21 body and the second section 22 body, so that the connecting section 26 has a certain degree of flexibility and movement space, and the collection piece 5 is connected to the connecting section 26, so that when the battery module vibrates or expands, the connection The section 26 can absorb a certain amount of vibration, prevent the collection piece 5 from being desoldered or broken, and improve the stability and safety of the battery module information collection device. Exemplarily, the connecting section 26 is in a Z shape, so as to avoid the internal structure of the battery module and improve the utilization rate of the area. In an embodiment, the shape of the connecting section 26 can be set according to actual conditions.

Optionally, the flexible circuit board 2 is further provided with a temperature sensor 9 , and the part of the flexible circuit board 2 provided with the temperature sensor 9 is bent downwards and extends below the insulating support 1 . In order to make the distance between the temperature sensor 9 and the electric core relatively close, the temperature detection accuracy and sensitivity are improved.

As shown in FIG. 4 , this embodiment also provides a battery module, which includes a plurality of battery cells 100 and the above-mentioned battery module information collection device. The multiple battery cells 100 are arranged side by side along the first direction, and the positive poles and negative poles on the multiple battery cells 100 are distributed in two rows. Optionally, the insulating support 1 is arranged on the pole end 101 of the battery cell 100, and the distribution of the positive pole and the negative pole of the battery cell 100 protrudes from the insulating support 1 to connect with the bus bar 4, and the reinforcing plate 3 is arranged on the One end plate of the battery module.

For example, two batteries form a group, the positive poles of one group of batteries are located in the same row, the negative poles are located in the same row, and the positive poles of two adjacent groups of batteries are located in two different rows, that is, the first battery cell The positive poles of the second cell are on the same side, the positive poles of the third cell and the fourth cell are on the other side, and so on. The positive poles of the first group of batteries are connected in parallel through a busbar 4, the negative poles of the first group and the positive poles of the second group are connected in series through a busbar 4, the negative poles of the second group and the positive poles of the third group Connect in series through a busbar 4 until the negative poles of the last group of cells are connected in parallel through a busbar 4 . And draw a positive lead-out piece 7 on the bus piece 4 connected to the first group, and draw a negative lead-out piece 8 on the bus piece 4 connected to the last group, that is, the positive lead-out piece 7 is the positive pole of the battery module, and the negative lead-out piece 8 is the negative pole of the battery module.

Optionally, a temperature sensor 9 is respectively provided on the flexible circuit board 2 located at the positive pole and the negative pole of the battery module, and at least one temperature sensor 9 is also provided on the flexible circuit board 2 located between the positive pole and the negative pole of the battery module. Under the above structure, the temperature of the positive pole, the negative pole and the middle part of the battery module can be detected in time, the detection accuracy is high, and the temperature can be fed back in time, so as to deal with the abnormal situation in time.

By using the battery module information collection device, the battery module is not only easy to assemble, but also reduces manufacturing costs and waste of raw materials; at the same time, it has high space utilization, light overall weight, strong internal structure stability, and vibration resistance Better, can realize industrialized batch production.

Claims

A battery module information collection device, comprising an insulating support (1) and a flexible circuit board (2), the flexible circuit board (2) is folded into a U-shaped strip, and the two extensions of the U-shaped strip are along the first The direction is set and erected on the insulating support (1), the flexible circuit board (2) is strip-shaped when unfolded, and the flexible circuit board (2) is set to collect battery information.
The battery module information collection device according to claim 1, wherein the flexible circuit board (2) comprises a first section (21), a second section (22) and a transition section (23), the first section (21) and the second section (22) are connected by the transition section (23), the first section (21) extends along the first direction, and is connected with the transition section (23) The connection of the first end forms a first fold (24), the second section (22) is arranged along the first direction, and forms a second fold at the connection with the second end of the transition section (23). Folding part (25).
The battery module information collection device according to claim 1, wherein the insulating support (1) is provided with a first heat riveting post (11), and the flexible circuit board (2) is provided with a waist-shaped hole ( 27), the flexible circuit board (2) is mated and connected with the first heat riveting post (11) through the waist-shaped hole (27).
The battery module information collection device according to claim 2, further comprising a reinforcing plate (3), the reinforcing plate (3) is arranged at one end of the insulating bracket (1), and the transition section (23) Located on the reinforcing plate (3), the first folding portion (24) and the second folding portion (25) are both connected to the reinforcing plate (3).
The battery module information collection device according to claim 2, further comprising a plurality of bus bars (4), the plurality of bus bars (4) arranged in two rows on the insulating support (1), each The bus bars (4) in rows are arranged along the first direction, the flexible circuit board (2) is located between two rows of bus bars (4), and the bus bars (4) are arranged in series and in parallel At least one of the battery cells.
The battery module information collection device according to claim 5, wherein a plurality of second heat riveting posts (12) are arranged on the insulating bracket (1), and each of the bus bars (4) is connected to at least one of the The second hot riveting column (12) is connected by hot riveting.
The battery module information collection device according to claim 5, further comprising a plurality of collection sheets (5), and the two ends of each collection sheet (5) are respectively connected to one of the bus sheets (4) and the Flexible circuit board (2).
The battery module information collection device according to claim 7, wherein the first section (21) and the second section (22) are respectively provided with a A plurality of grooves, the first side wall of the groove protrudes toward the second side wall and is provided with a connecting section (26), and the two ends of the collection sheet (5) are respectively connected to the bus sheet (4) and the The connecting section (26).
The battery module information collection device according to claim 1, further comprising a temperature sensor (9), the temperature sensor (9) being arranged on the flexible circuit board (2) and located on the insulating support (1) below.
A battery module, comprising a plurality of battery cells (100) and the battery module information collection device according to any one of claims 1-9.