WO2023241251A1

WO2023241251A1 - Sampling connecting piece, battery module, and vehicle

Info

Publication number: WO2023241251A1
Application number: PCT/CN2023/092091
Authority: WO
Inventors: 王旭东; 吕永民; 牛亚琪
Original assignee: 浙江极氪智能科技有限公司; 威睿电动汽车技术(宁波)有限公司; 浙江吉利控股集团有限公司
Priority date: 2022-06-15
Filing date: 2023-05-04
Publication date: 2023-12-21
Also published as: CN217507605U

Abstract

The present application discloses a sampling connecting piece, a battery module, and a vehicle. The sampling connecting piece comprises a connecting body; a bent cushioning portion is provided on the connecting body; the bent cushioning portion comprises a first end and a second end which are connected to the connecting body, the bent cushioning portion forms, between the first end and the second end, a cushioning space protruding in a direction distant from the connecting body; the distance between the first end and the second end is greater than the protruding height of the cushioning space.

Description

Sampling connectors, battery modules and vehicles

This application claims priority to the Chinese patent application with application number 202221501103.2 filed on June 15, 2022, the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the technical field of battery modules, and in particular, to a sampling connecting piece, a battery module and a vehicle.

Background technique

With the development of electric vehicle technology, the application of battery packs has become more and more popular. The safety of battery packs has become the most concerned issue, and the design of sampling lines is often an important part of the safety design of battery packs. The currently used sampling connection piece is generally directly patch welded to the PCB to realize the connection between the sampling connection piece and the PCB board (printed circuit board). However, under long-term vibration, the welding position between the PCB board and the battery core will loosen, causing the PCB board to fall off, causing power outage and affecting the stability and safety of the vehicle.

technical problem

The main purpose of this application is to provide a sampling connection piece, a battery module and a vehicle, aiming to solve the current technical problem that the welding position of the PCB board and the battery core will become loose, causing the PCB board to fall off.

Technical solutions

In order to achieve the above object, an embodiment of the present application proposes a sampling connecting piece. The sampling connecting piece includes a connecting body. The connecting body is provided with a bending buffer portion. The bending buffering portion has a third connection body connected to the connecting body. One end and a second end, the bent buffer portion forms a buffer space protruding in a direction away from the connection body between the first end and the second end, wherein the first end and The distance between the second ends is greater than the protruding height of the buffer space.

In an embodiment of the present application, the bending part of the bending buffer part is an arc transition.

In an embodiment of the present application, the radius of the arc is R, the thickness of the connecting body is D, and R is greater than or equal to D.

In an embodiment of the present application, the cross section of the bending buffer portion is U-shaped or arc-shaped.

In an embodiment of the present application, the bending angle of the bending buffer portion is 90 degrees.

In an embodiment of the present application, the sampling connecting piece is a nickel piece.

In one embodiment of the present application, the connection body is provided with a welding position.

In order to achieve the above purpose, an embodiment of the present application proposes a battery module, including a battery core, a PCB board, and a sampling connecting piece connecting the battery core and the PCB board. The sampling connecting piece is the sampling connecting piece described above. .

In an embodiment of the present application, there are a plurality of battery cells, the battery module further includes a bus bar connecting the plurality of battery cells, and the sampling connection piece connects the bus bar and the PCB board.

To achieve the above object, an embodiment of the present application provides a vehicle including the battery module described above.

beneficial effects

Compared with the existing technology, in a technical solution proposed by this application, the battery core and the circuit board can be connected through the sampling connection piece, thereby realizing the collection of voltage data of the battery core by the circuit board, conveniently monitoring the status of the battery core, and improving the efficiency of the battery core. safety during use. The battery pack may vibrate or be impacted during use. The circuit board is made of hard material and cannot absorb the stress generated by the vibration or impact of the battery pack, which may easily cause the circuit board to crack or fall off. To this end, a bending buffer portion is provided on the sampling connecting piece. It can be understood that the sampling connecting piece includes a connecting body and a bending buffering portion. The bending buffering portion is provided on the connecting body, and the connecting body connects the circuit board and the battery core. The connection between the bent buffer portion and the connection body forms a first end and a second end, and a buffer space for absorbing stress is formed between the first end and the second end by protruding in a direction away from the connection body. The buffer space can be used to provide a deformation space when the sampling connecting piece is stressed by the battery pack, to buffer the deformation distance, absorb and release stress, avoid damage to the welding position of the connection body, protect the welding position, and prevent open welding. This prevents the circuit board from cracking or falling off and improves the safety of the battery pack. Moreover, the distance between the first end and the second end of the bent buffer part is greater than the convex height of the buffer space, which can provide a sufficient buffer distance, which is conducive to the absorption and release of stress, and can further improve the buffering effect.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an embodiment of the sampling connecting piece of the present application;

Figure 2 is a schematic diagram of dimensions of an embodiment of the sampling connecting piece of the present application;

Figure 3 is a schematic structural diagram of a battery module embodiment of the present application;

Figure 4 is a partially enlarged structural schematic diagram of part A in Figure 3.

Explanation of reference numbers:

label	name	label	name
10	Sampling connector	11	Connect the body
12	Bending buffer part	13	Arc
14	Welding position	20	Batteries
15	buffer space	30	busbar
40	PCB board

The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

Embodiments of the invention

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the embodiments in this application.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relationship between components in a specific posture (as shown in the drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, descriptions such as "first", "second", etc. in the embodiments of the present application are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. . Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the embodiments of this application, "plurality" means at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

In the embodiments of this application, unless otherwise clearly stated and limited, the terms "connection", "fixing", etc. should be understood in a broad sense. For example, "fixing" can be a fixed connection, a detachable connection, or an integral body. ; 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 elements or an interactive relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In addition, the technical solutions in the various embodiments of the present application can be combined with each other, but it must be based on what a person of ordinary skill in the art can implement. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions is possible. It does not exist and is not within the protection scope required by the embodiments of this application.

At present, the collection of voltage data in new energy battery packs (PACK) generally uses flexible circuit boards (FPC) or PCB hard boards. When collecting voltage through the FPC soft board, because the FPC soft board itself is soft, the soft board can directly absorb the mechanical stress caused by the PACK vibration. As for the method of collecting through a hard PCB board, since the material of the PCB board is relatively hard, it cannot absorb the stress generated during PACK vibration or impact, which can easily cause damage to the welding position and affect the normal use of the battery pack. At this time, how to design the structure to absorb stress is particularly important for the safe use of the battery pack.

In view of this, the embodiment of the present application provides a sampling connecting piece, which is provided with a bending buffer part on the connection body, and the distance between the first end and the second end of the bending buffer part is larger than the convexity of the buffer space. The lifting height can provide sufficient buffering distance, which is conducive to the absorption and release of stress and can improve the buffering effect.

In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, the embodiment of the present application proposes a sampling connecting piece 10. The sampling connecting piece 10 includes a connecting body 11. The connecting body 11 is provided with a bending buffer portion 12. The bending buffer portion 12 has a connection with the connecting body 11. The first end and the second end are connected, and the bent buffer portion 12 forms a buffer space 15 protruding in a direction away from the connection body 11 between the first end and the second end, wherein between the first end and the second end The distance between them is greater than the protruding height of the buffer space 15.

In the technical solution adopted in this embodiment, the battery core 20 and the circuit board can be connected through the sampling connecting piece 10, thereby realizing the collection of voltage data of the battery core 20 by the circuit board, conveniently monitoring the status of the battery core 20, and improving the performance of the battery core 20. safety during use. The battery pack may vibrate or be impacted during use. The circuit board is made of hard material and cannot absorb the stress generated by the vibration or impact of the battery pack, which may easily cause the circuit board to crack or fall off. To this end, a bending buffer portion 12 is provided on the sampling connecting piece 10. It can be understood that the sampling connecting piece 10 includes a connecting body 11 and a bending buffering portion 12. The bending buffering portion 12 is provided on the connecting body 11. The body 11 connects the circuit board and the battery core 20 , and the connection between the bending buffer portion 12 and the connection body 11 forms a first end and a second end, and the space between the first end and the second end protrudes in a direction away from the connection body 11 A buffer space 15 for absorbing stress is formed. The buffer space 15 can be used to provide a deformation space when the sampling connecting piece 10 is stressed by the battery pack, thereby buffering the deformation distance, absorbing and releasing the stress, avoiding damage to the welding position of the connection body 11, and achieving protection of the welding position to prevent Open welding to prevent the circuit board from cracking or falling off and improve the safety of the battery pack. Moreover, the distance between the first end and the second end of the bent buffer portion 12 is greater than the convex height of the buffer space 15, which can provide a sufficient buffer distance, which is beneficial to the absorption and release of stress, and can further improve the buffering effect.

Specifically, the sampling connecting piece 10 may include a connecting body 11 and a bending buffer portion 12 . The connection body 11 serves as a connection medium. One end of the connection body 11 is connected to the battery core 20, and the other end is connected to the circuit board. In this way, the circuit board can be used to collect voltage data of the battery core 20. In one embodiment, the circuit board and the battery core 20 are welded to the connection body 11 respectively. Furthermore, soldering between the circuit board and the connecting body 11 and between the connecting body 11 and the battery core 20 is performed using solder paste, which can improve the reliability of the welding. Specifically, the operator heats the solder paste with a soldering gun, and then points the molten solder paste at the connection between the connection body 11 and the circuit board, and the connection between the connection body 11 and the battery core 20. After the solder paste cools, the solidified tin The paste can complete the connection and fixation of the connection body 11 and the circuit board, and the connection body 11 and the battery core 20 . The connecting body 11 may be in a long strip shape, which is not limited here. A bending buffer portion 12 is provided along the length direction and/or width direction of the connection body 11. The bending buffer portion 12 can be formed by bending the connection body 11, and is integrally formed with the connection body 11, so that the sampling connecting piece 10 forms a three-dimensional structure. In one embodiment, the bending angle of the bending buffer portion 12 is 90 degrees, that is, the connecting body 11 is bent at 90 degrees, and four consecutive 90-degree bends can be performed to form the bending buffer portion 12 . When the connecting body 11 is bent to form the bending buffer part 12, the connection between the bending buffer part 12 and the connecting body 11 constitutes the first end and the second end of the bending buffer part 12, and the first end and the second end are The space is bent away from the connecting body 11 to form a buffer space 15 . When the battery pack vibrates or impacts and generates mechanical stress, the bending buffer portion 12 can expand and contract accordingly according to the stress, thereby buffering, absorbing and releasing the mechanical stress, avoiding damage to the welding position, and protecting the welding position. It is safe to avoid loosening of the welding position, causing open welding and causing parts to fall off. In addition, in order to further improve the buffering effect against stress, the distance between the first end and the second end is greater than the protruding height of the buffer space 15, which can provide sufficient telescopic length and is conducive to the absorption and release of stress. In one embodiment, referring to FIG. 2 , the distance L between the first end and the second end is 2.4 cm, and the height H of the buffer space 15 is 1.6 cm.

In one embodiment, the cross-sectional shape of the bending buffer portion 12 may be a "U" shape, a "J" shape, an arc shape, etc., or a shape similar to these shapes, which are not limited here. The number of the bending buffer portion 12 may be one or multiple, and is not limited here. In one embodiment, when multiple bending buffers 12 are provided, each bending buffer 12 is arranged in an array along the length direction or the width direction, so that the plurality of bending buffers 12 are evenly distributed and the stress can be evenly distributed. The mechanical stress produces corresponding expansion and contraction deformation.

In one embodiment, the first end and the second end have a predetermined distance in the protruding direction of the buffer space 15, so that the two ends of the connecting body are distributed in a high and low direction in the protruding direction of the buffer space 15, which can reduce the connecting body. The welding plane leaves space for the welding surface to meet the assembly needs of other structural parts.

Referring to FIG. 1 , in an embodiment of the present application, the bending part of the bending buffer part 12 is a transition of an arc 13 . Through the arc 13 provided at the connection point, the tension at the connection location can be dispersed, thereby preventing the connection point between the bending buffer portion 12 and the connection body 11 from being broken due to excessive force. It should be pointed out that the bending buffer portion 12 itself can also have an arc 13 transition structure, so that the sampling connecting piece 10 does not increase in length or width on the plane, and at the same time, it can also allow the sampling connecting piece 10 to bear force when it is stressed. Deformation and expansion in the direction of force.

Referring to Figure 2, in one embodiment, the radius of the arc 13 is R, the thickness of the connecting body 11 is D, and R is greater than or equal to D. This can facilitate the bending of the connecting body 11 to form the bending buffer 12, and can also ensure The strength of the connection between the bending buffer portion 12 and the connection body 11. In one embodiment, the thickness D of the connecting body 11 is 0.3 cm, the radius R of the arc 13 may be 0.3 cm, and the radius R of the arc 13 may also be 0.6 cm.

In an embodiment of the present application, the sampling connection piece 10 is a nickel piece. The nickel flakes themselves exist in the battery pack, and the structure of the nickel flakes in the battery pack only needs to be optimized, without increasing the number of parts and additional costs, which can further simplify the overall structure of the battery pack. Of course, in other embodiments, other specific strength materials can also be used to replace the nickel sheets in this embodiment, which is not limited here.

In an embodiment of the present application, the connection body 11 is provided with a welding position 14 . The welding positions 14 provided can realize welding positioning with other components during welding. In one embodiment, the welding position 14 may be a welding hole, and the shape of the welding hole may be a square hole, a circular hole, etc., which is not limited here. The number of welding positions 14 can also be one or more, preferably three, and are distributed in a triangular shape, using the stability of the triangle to improve the stability of welding.

Referring to Figures 3 and 4, in order to achieve the above purpose, an embodiment of the present application proposes a battery module, including a battery core 20, a PCB board 40 and a sampling connecting piece connecting the battery core 20 and the PCB board 40. The sampling connecting piece is as follows Description of the sampling connector piece 10. Specifically, the specific structure of the sampling connecting piece 10 refers to the above-mentioned embodiment. Since the battery module adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be discussed here. Let’s go over them one by one. In this embodiment, the number of battery cores 20 is no less than two. Each battery core 20 is arranged side by side and close to each other. The number of sampling connecting pieces 10 is correspondingly set according to the number of battery cores 20 .

Referring to FIG. 3 , in an embodiment of the present application, there are multiple battery cells 20 , the battery module also includes a bus bar 30 connecting the plurality of battery cells 20 , and the sampling connection piece 10 connects the bus bar 30 and the PCB board 40 . In this embodiment, multiple battery cells 20 can be connected in series through the bus bar 30 .

The embodiment of the present application also proposes a vehicle, which includes the above battery module. Specifically, the specific structure of the battery module refers to the above embodiment. Since the vehicle adopts all the technical solutions of the above embodiment, it at least has the above All beneficial effects brought by the technical solutions of the embodiments will not be repeated here.

The above are only optional embodiments of the present application, and are not intended to limit the patent scope of the embodiments of the present application. Under the inventive concept of the embodiments of the present application, equivalent structures can be made using the contents of the description and drawings of the embodiments of the present application. Transformation, or direct/indirect application in other related technical fields are all included in the patent protection scope of the embodiments of this application.

Claims

A sampling connecting piece, wherein the sampling connecting piece includes a connecting body, a bending buffer portion is provided on the connecting body, and the bending buffer portion has a first end and a second end connected to the connecting body, so The bent buffer portion forms a buffer space between the first end and the second end that protrudes in a direction away from the connection body, wherein the gap between the first end and the second end is The distance is greater than the protruding height of the buffer space.
The sampling connecting piece according to claim 1, wherein the bending part of the bending buffer part is an arc transition.
The sampling connecting piece according to claim 2, wherein the radius of the arc is R, the thickness of the connecting body is D, and R is greater than or equal to D.
The sampling connecting piece according to claim 3, wherein the cross section of the bending buffer portion is U-shaped or arc-shaped.
The sampling connecting piece according to claim 3, wherein the bending angle of the bending buffer portion is 90 degrees.
The sampling connection piece according to any one of claims 1 to 5, wherein the sampling connection piece is a nickel piece.
The sampling connection piece according to claim 6, wherein the connection body is provided with welding positions.
A battery module includes a battery core, a PCB board, and a sampling connecting piece connecting the battery core and the PCB board. The sampling connecting piece is the sampling connecting piece according to any one of claims 1-7.
The battery module of claim 8, wherein there are a plurality of battery cells, the battery module further includes a bus bar connecting the plurality of battery cells, and the sampling connecting piece connects the bus bar and all the battery cells. The PCB board.
A vehicle including the battery module according to claim 8 or 9.