Busbar and battery

Abstract

The invention provides a busbar and a battery, and belongs to the technical field of batteries, and the busbar comprises two plugging parts which can be respectively used for plugging and fixing pole columns on a battery cell; the connecting parts are arranged on the inserting parts respectively; two ends of the flexible conductive part are respectively fixed with the corresponding connecting parts; the battery has the advantages that when the plugging parts are plugged and fixed with the poles on the battery cells, the plugging parts can be electrically connected with the poles, each plugging part is provided with a connecting part, and the two ends of the flexible conductive part are electrically connected with the corresponding connecting parts respectively, so that series connection or parallel connection between the two battery cells can be realized; when the volume of the battery cell is expanded or contracted due to charging and discharging, the flexible conductive part can adaptively change the linear length of the battery cell, so that the stability of electric connection of the battery cell in the use process is ensured; meanwhile, the distance between the inserting parts in the busbar is adjustable, so that the installation sequence of the busbar does not need to be limited, and the assembly sequence of the busbar and the busbar can be adjusted according to actual assembly requirements.

Description

Technical Field

[0001] The present invention belongs to the field of battery technology, and in particular relates to a bus and a battery Background Art

[0002] The battery pack connector (also known as the bus) is used to realize the series and parallel connection between the battery cells, and plays the role of shunting or collecting current and voltage. The existing battery pack connectors are mainly made of copper or aluminum plates through stamping and bending. The connectors are welded to the positive and negative electrodes of the battery cells by laser welding to realize the circulation of the circuit. However, the existing bus has certain problems: because the existing bus is generally made by stamping and bending hard or semi-hard copper or aluminum plates, the hardness of the manufactured bus is relatively high and has no ductility. After multiple charge and discharge, the battery will heat up and bulge. After the battery cell expands, the bus is directly pulled, which is easy to break or tear at the weld, causing the connection between the bus and the battery cell to fail. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems in the prior art and to provide a busbar that can be deformed along with the expansion and contraction of the battery cell volume.

[0004] The object of the present invention can be achieved through the following technical solutions: A bus bar, comprising:

[0005] Two plug-in parts, the two plug-in parts can be used to be plugged and fixed to the poles on the battery cell respectively;

[0006] A connecting part, each of the plug-in parts is provided with the connecting part;

[0007] A flexible conductive part, wherein two ends of the flexible conductive part are respectively fixed to corresponding connecting parts.

[0008] In the above-mentioned busbar, the connecting portion includes a connecting plate extending along the plugging direction of the plugging portion, and two ends of the flexible conductive portion are respectively fixed to the corresponding connecting plates.

[0009] In the above-mentioned busbar, the plug-in portion includes a plug-in board, the plug-in board is bent to form a plug-in cavity, and the number of the connecting boards is two, and the two connecting boards are respectively located on both sides of the plug-in board.

[0010] In the above-mentioned busbar, a connection plane is provided on the connection plate, and the end of the flexible conductive part is fixed on the connection plane.

[0011] In the above-mentioned busbar, after the plug-in portion is plugged and fixed to the pole on the battery cell, a gap is provided between the connecting plate and the battery cell.

[0012] In the above-mentioned busbar, the plug board and the two connecting boards are integrally arranged.

[0013] In the above-mentioned busbar, the flexible conductive part includes at least one connecting wire, the two ends of the connecting wire are respectively fixed to the corresponding connecting parts, and the straight length of each connecting wire is greater than the spacing length between the connecting parts fixed to the two ends of the connecting wire.

[0014] In the above-mentioned busbar, there are multiple connecting wires, and the multiple connecting wires are arranged in sequence and spaced apart.

[0015] In the above-mentioned busbar, both ends of the connecting wire form flat ends, and the flat ends are fixed to the corresponding connecting parts by welding.

[0016] A battery comprises the above-mentioned busbar.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) When the plug-in part is plugged and fixed to the pole on the battery cell, an electrical connection can be achieved between the plug-in part and the pole. Each plug-in part is provided with a connecting part, and the two ends of the flexible conductive part are respectively electrically connected to the corresponding connecting parts, so that the two battery cells can be connected in series or in parallel. When the volume of the battery cell expands or contracts due to charging and discharging, the flexible conductive part can adaptively change its straight length accordingly, thereby ensuring the stability of the electrical connection of the battery cell during use;

[0019] (2) At the same time, because the distance of the plug-in parts in the busbar is adjustable, there is no need to limit the installation sequence of the busbar and the battery cell, and the assembly sequence of the two can be adjusted according to actual assembly requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the busbar;

[0021] Figure 2 It is a three-dimensional structural diagram of the connecting wire;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the plug-in part and the connecting part;

[0023] In the figure, there are a plug-in portion 100 , a plug-in board 101 , a plug-in cavity 102 , a connecting portion 200 , a connecting board 201 , a connecting plane 202 , a flexible conductive portion 300 , a connecting wire 301 , and a flat end 302 . DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] like Figure 1-Figure 3 As shown, a bus bar comprises:

[0027] Two plug-in parts 100, the two plug-in parts 100 can be respectively used to be plugged and fixed with the poles on the battery cell;

[0028] A connecting portion 200 , each plug-in portion 100 is provided with a connecting portion 200 ;

[0029] The flexible conductive part 300 has two ends which are respectively fixed to the corresponding connecting parts 200 .

[0030] In this embodiment, while the plug-in part 100 is plugged and fixed to the pole on the battery cell, an electrical connection can be achieved between the plug-in part 100 and the pole. A connecting part 200 is provided on each plug-in part 100, and both ends of the flexible conductive part 300 are respectively electrically connected to the corresponding connecting part 200, so that the series or parallel connection between the two battery cells can be achieved. When the volume of the battery cell expands or shrinks due to charging and discharging, the flexible conductive part 300 can adaptively change its straight length accordingly, thereby ensuring the stability of the electrical connection of the battery cell during use.

[0031] It should be noted that, because in the prior art, the busbar has a high hardness and no ductility, so during the assembly process, the battery cell needs to be installed in the box and pre-tightened before the busbar can be connected to the battery cell. Otherwise, during the pre-tightening process of the battery cell, the change in the position of the battery cell will cause the busbar to break. In the present application, because the distance of the plug-in portion 100 in the busbar is adjustable, the installation order of the busbar and the battery cell does not need to be limited. As an optional solution: the busbar can be installed first, and then the battery cell can be installed in the box and connected to the busbar, and pre-tightened; or the battery cell can be installed in the box first, and then the busbar is placed in the box and connected to the battery cell, and then the battery cell is pre-tightened. The assembly order of the two can be adjusted according to the actual assembly requirements.

[0032] It is worth mentioning that both the plug-in portion 100 and the connecting portion 200 are made of conductive materials, and one or more of the existing aluminum, copper, and silver can be selected.

[0033] Preferably, the connecting portion 200 includes a connecting plate 201 extending along the plugging direction of the plugging portion 100 , and both ends of the flexible conductive portion 300 are respectively fixed to the connecting portion 200 .

[0034] In this embodiment, the connection plate 201 disposed on the plug-in portion 100 can increase the heat dissipation area of ​​the plug-in portion 100 , and also provide an installation space for the connection of the flexible conductive portion 300 .

[0035] Specifically, the plug-in portion 100 includes a plug-in board 101 , which is bent to form a plug-in cavity 102 . There are two connecting boards 201 , which are respectively located on both sides of the plug-in board 101 .

[0036] like Figure 3 As shown, two connection plates 201 are symmetrically arranged on both sides of the plug board 101, and each connection plate 201 can be electrically connected to the flexible conductive part 300, so that multiple battery cells can be connected in series or in parallel.

[0037] It is worth mentioning that a connecting plane 202 is provided on the connecting plate 201, and the end of the flexible conductive part 300 is fixed on the connecting plane 202. The setting of the connecting plane 202 on the connecting plate 201 increases the contact area between the flexible conductive part 300 and the connecting plane 202 when the flexible conductive part 300 is fixed to the connecting plane 202, thereby ensuring the connection stability between the flexible conductive part 300 and the connecting plate 201.

[0038] It should be noted that when the plug-in part 100 is plugged and fixed to the pole on the battery cell, a gap is set between the connecting plate 201 and the battery cell, that is, the connecting plate 201 does not contact the surface of the battery cell, thereby increasing the contact area between the connecting plate 201 and the external space to increase the heat dissipation area of ​​the connecting plate 201.

[0039] It is worth mentioning that the plug board 101 and the two connecting boards 201 are integrally arranged to increase the overall strength of the plug board 101 and the connecting boards 201 .

[0040] Further preferably, the flexible conductive part 300 includes at least one connecting wire 301, both ends of the connecting wire 301 are respectively fixed to the corresponding connecting part 200, and the straight length of each connecting wire 301 is greater than the interval length between the connecting parts 200 fixed to the two ends of the connecting wire 301. Preferably, the material of the connecting wire 301 is set to be bare copper wire, which has good conductivity and a certain deformation ability, so that the connecting wire 301 can be straightened or contracted according to the expansion or contraction deformation of the battery cell to adapt to the deformation of the battery cell.

[0041] It is worth mentioning that the number of connecting wires 301 is preferably multiple, and the multiple connecting wires 301 are arranged in sequence and spaced apart, and the multiple spiral copper wires do not contact each other. When current passes through the conductor, heat is generated. Multiple wires can disperse the current, thereby reducing the current density on each wire, which helps to improve the heat dissipation efficiency, reduce the wire temperature, and extend the service life.

[0042] Further preferably, both ends of the connecting wire 301 form flat ends 302 , and the flat ends 302 are fixed to the corresponding connecting parts 200 by welding.

[0043] In this embodiment, bare copper wires are overlapped on the connecting plane 202 of the connecting plate 201, and flat ends 302 are formed at both ends of each bare copper wire to increase the connection area with the connecting plate 201. The flat ends 302 can be formed by directly extruding the bare copper wire, or a flat end 302 can be fixedly set at the end of the bare copper wire for connection. Thereafter, the flat ends 302 and the connecting plate 201 are welded by polymer diffusion welding or ultrasonic welding to fix the flat ends 302 at both ends of the bare copper wire to the connecting plate 201.

[0044] A battery comprises the above-mentioned busbar.

[0045] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0046] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A busbar, characterized in that: include: Two plug-in parts, the two plug-in parts can be used to be plugged and fixed to the poles on the battery cell respectively; A connecting part, each of the plug-in parts is provided with the connecting part; A flexible conductive part, wherein two ends of the flexible conductive part are respectively fixed to corresponding connecting parts.

2. A busbar according to claim 1, characterized in that: The connecting portion comprises a connecting plate extending along the plugging direction of the plugging portion, and two ends of the flexible conductive portion are respectively fixed to the corresponding connecting plates.

3. A busbar according to claim 2, characterized in that: The plug-in portion comprises a plug-in board, the plug-in board is bent to form a plug-in cavity, and the number of the connecting plates is two, and the two connecting plates are respectively located on both sides of the plug-in board.

4. A busbar according to claim 2, characterized in that: The connecting plate is provided with a connecting plane, and the end of the flexible conductive part is fixed on the connecting plane.

5. A busbar according to claim 2, characterized in that: When the plug-in portion is plugged and fixed to the pole on the battery cell, a gap is provided between the connecting plate and the battery cell.

6. A busbar according to claim 3, characterized in that: The plug board is integrally arranged with the two connecting plates.

7. The busbar according to claim 1, characterized in that: The flexible conductive part includes at least one connecting wire, both ends of which are respectively fixed to corresponding connecting parts, and the straight length of each connecting wire is greater than the interval length between the connecting parts fixed to the two ends of the connecting wire.

8. A busbar according to claim 7, characterized in that: There are multiple connecting wires, and the multiple connecting wires are arranged in sequence and spaced apart.

9. A busbar according to claim 7 or 8, characterized in that: Both ends of the connecting wire form flat ends, and the flat ends are welded and fixed to the corresponding connecting parts.

10. A battery, characterized in that: Comprising the busbar as described in any one of claims 1-9.

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