Busbar and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a busbar and a battery pack. The busbar comprises an aluminum bar and two connecting pieces, wherein positioning grooves are formed in the two ends of the aluminum bar; the two connecting pieces are both made of copper or aluminum and are fixed in the positioning grooves in a one-to-one correspondence manner through ultrasonic welding, one of the two connecting pieces is used for being electrically connected with the battery module, and the other one of the two connecting pieces is used for being electrically connected with external equipment. The busbar solves the problems of high cost, long time consumption and high energy consumption of the existing aluminum bar hot-pressing nickel sheet mode, and improves the production efficiency and the economic benefit of the battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a busbar and battery pack. BACKGROUND

[0002] In the current power battery pack, usually including multiple battery modules. In the adjacent connection between battery modules or the electrical connection link of battery module and battery pack power output, the busbar is a commonly used component.

[0003] In order to reduce production cost, the busbar is widely used aluminum bar. For large size long aluminum bar, in order to ensure effective connection with related electrical devices at the contact position and reduce contact resistance, nickel sheet is often welded at the end of aluminum bar by hot pressure welding, but this method mainly depends on high frequency welding machine, and there are problems of long welding time and high energy consumption in the welding process, which leads to high cost, affects the production efficiency and economic benefit of power battery pack, and brings great burden to enterprises.

[0004] Therefore, it is urgent to provide a busbar to solve the above problems. UTILITY MODEL CONTENTS

[0005] The first purpose of the utility model is to provide a busbar, which solves the problems of high cost, long time and high energy consumption in the existing aluminum bar hot pressure nickel sheet method, and improves the production efficiency and economic benefit of battery pack.

[0006] The second purpose of the utility model is to provide a battery pack, which realizes efficient, reliable and low-cost electrical connection between battery modules and between the output end of the battery pack by using the above busbar, solves the problems of high cost and low efficiency caused by the connection problem of the busbar in the existing connection method, and improves the overall performance of the battery pack.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A busbar, comprising:

[0009] An aluminum bar, both ends of the aluminum bar are provided with a positioning groove;

[0010] Two connecting pieces, both of which are copper or aluminum material, the connecting piece is fixed in the positioning groove by ultrasonic welding one by one, one of the two connecting pieces is used for electrically connecting the battery module, and the other is used for electrically connecting the external equipment.

[0011] As an optional scheme of the busbar, the height of the connecting piece is equal to the depth of the positioning groove.

[0012] As an optional solution of the busbar, the connecting piece comprises a positioning part and a boss part connected with the positioning part, the positioning part is accommodated in the positioning groove, and the end face of the boss part is higher than the surface of the aluminum bar.

[0013] As an optional solution of the busbar, the positioning part is coaxial with the boss part.

[0014] As an optional solution of the busbar, the diameter of the boss part is smaller than the diameter of the positioning part.

[0015] As an optional solution of the busbar, the outer surface of the connecting piece is covered with a protective layer by electroplating.

[0016] As an optional solution of the busbar, the aluminum bar is provided with a first connecting hole at each end, the positioning groove is arranged around the first connecting hole, the connecting piece is provided with a second connecting hole coaxial with the first connecting hole, the connecting piece is connected with the battery module or the external device through a fastener, and the fastener is arranged in the second connecting hole and the first connecting hole.

[0017] As an optional solution of the busbar, the second connecting hole at one end of the aluminum bar and the first connecting hole on the connecting piece at the corresponding position are waist-shaped holes.

[0018] As an optional solution of the busbar, the outer surface of the aluminum bar is covered with an insulating layer.

[0019] The battery pack comprises a plurality of battery modules and the busbar, and the busbar is arranged between adjacent two battery modules or between the battery module and the output end of the battery pack.

[0020] Advantages:

[0021] The utility model provides a kind of busbar, copper or aluminum material connecting piece is fixed in positioning groove using ultrasonic welding mode, replace the mode of nickel sheet in prior art hot-press welding, improve production efficiency, reduce cost, overcome the defect of long welding time, high energy consumption, high cost caused by dependence on high-frequency welding machine.And aluminum bar is provided with positioning groove, connecting piece is fixed therein by ultrasonic welding, connection is stable, so that the connection between battery module and battery module and battery pack output end is more stable and reliable.This not only guarantees the effective connection of busbar in the adjacent connection between battery module or with battery pack power output port electrical connection link, reduces contact resistance, and improves the production efficiency and economic benefit of battery pack, reduces the burden of enterprise.

[0022] The utility model provides a kind of battery pack, by setting above busbar, reduce welding time and energy consumption, reduce cost, realize stable and reliable connection, while helping to improve the performance of battery pack, improve its production efficiency and economic benefits, to further improve the stability and efficiency of entire battery pack in use process, reduce enterprise burden, enhance the market competitiveness of product. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the first schematic diagram of busbar provided by the utility model embodiment;

[0024] Figure 2 It is the second schematic diagram of busbar provided by the utility model embodiment.

[0025] In the drawing:

[0026] 1-aluminum row;11-first connecting hole;12-positioning groove;

[0027] 2-connecting piece;21-second connecting hole;22-positioning part;23-boss part;

[0028] 3-insulating layer;4-welding head. DETAILED DESCRIPTION

[0029] The utility model will be further explained in detail in connection with the drawings and embodiment. It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model. In addition, it should be noted that, in order to facilitate description, only part of the structure related to the utility model is shown in the drawing, not all structures.

[0030] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0031] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0032] In the description of the present embodiment, the terms "upper", "lower", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0033] The present embodiment provides a busbar and a battery pack, the battery pack comprising a plurality of battery modules and the above-mentioned busbar, and the busbar is arranged between the battery modules and external equipment. The busbar can improve the efficiency of electric energy transmission, creating a low-resistance transmission path for the current, thereby effectively reducing the loss of electric energy in the transmission process. At the same time, the busbar can also enhance the structural stability of the battery pack, reducing the possibility of connection loosening or damage caused by factors such as vibration. In addition, the busbar is conducive to optimizing the space utilization of the battery pack, making the internal layout of the battery pack more reasonable and compact. Moreover, the busbar makes the assembly and maintenance of the battery pack more convenient, simplifying the connection operation between battery modules and facilitating maintenance personnel to quickly locate and replace when module failure occurs.

[0034] Specifically, as shown in Figure 1 and Figure 2 , the busbar comprises an aluminum bar 1 and two connecting pieces 2. The aluminum bar 1 has a positioning groove 12 at both ends. The two connecting pieces 2 are made of copper or aluminum material, and the connecting piece 2 is fixed in the positioning groove 12 by ultrasonic welding, one of the two connecting pieces 2 is used for electrically connecting the battery module, and the other is used for electrically connecting the external equipment. It should be noted that since the structure of the connecting piece 2 in the positioning groove 12 at both ends of the aluminum bar is exactly the same, only the positioning groove 12 at one end of the aluminum bar 1 and the connecting piece 2 in the positioning groove 12 are shown in the drawings of the present embodiment as an example.

[0035] The busbar provided by the present embodiment uses ultrasonic welding to fix the connecting piece 2 made of copper or aluminum material in the positioning groove 12, replacing the hot-pressed nickel sheet welding method in the prior art, improving the production efficiency, reducing the cost, and overcoming the defects of long welding time, high energy consumption and high cost caused by dependence on high-frequency welding machine. Moreover, the aluminum bar 1 is provided with the positioning groove 12, and the connecting piece 2 is fixed therein by ultrasonic welding, which is stable and reliable, thereby making the connection between the battery module and the external equipment more stable and reliable. This not only ensures the effective connection of the busbar in the electrical connection between the battery module and the external equipment, reduces the contact resistance, but also improves the production efficiency and economic benefit of the battery pack, and reduces the burden of enterprises.

[0036] It is worth mentioning that the external device herein includes another battery module, the output end of a battery pack including the battery module, or other electronic devices, and the busbar can be used to electrically connect the battery module and other external devices according to specific needs, which is not specifically limited herein.

[0037] Specifically, the aluminum busbar 1 is made of high-strength alloy, such as 1 series, 6 series or 8 series, etc. These high-strength alloy aluminum busbars have good electrical conductivity, corrosion resistance and mechanical properties.

[0038] It is worth mentioning that in other optional embodiments, the aluminum busbar 1 and the connecting piece 2 can also be welded by brazing or friction welding, etc., which is not specifically limited herein.

[0039] Specifically, as shown in Figure 1 , after the connecting piece 2 is placed in the positioning groove 12, a small annular gap is formed between the connecting piece 2 and the side wall of the positioning groove 12, and the welding head 4 welds the annular gap between the connecting piece 2 and the positioning groove 12. During the welding process, the ultrasonic generator generates high-frequency vibration, and the electric energy is converted into mechanical energy by the transducer and transmitted to the welding head 4. The welding head 4 contacts the connecting piece 2 and uniformly applies vibration energy to the contact surface of the connecting piece 2 and the positioning groove 12, so that the connecting piece 2 made of copper or aluminum material and the contact interface of the aluminum busbar 1 are rubbed and diffused under high-frequency vibration, thereby forming a firm welding joint. This welding method avoids the problems of local overheating and uneven welding that may occur when nickel sheets are welded by hot pressing, because the energy of ultrasonic welding is concentrated on the contact surface and does not cause excessive heat to the surrounding materials.

[0040] In the present embodiment, as shown in Figure 1 and Figure 2 , the connecting piece 2 includes a positioning portion 22 and a boss portion 23 connected to the positioning portion 22, the positioning portion 22 is accommodated in the positioning groove 12, and the end face of the boss portion 23 is higher than the surface of the aluminum busbar 1. The connecting surface of the connecting piece 2 to the battery module or the external device is the upper end face of the boss portion 23, the boss portion 23 can effectively avoid the influence of welding burrs on the connecting surface, the boss portion 23 is higher than the surface of the aluminum busbar 1, so that the connecting surface is away from the area where the welding burrs are generated, ensuring the flatness and cleanliness of the connecting surface, thereby improving the quality of the connection to the battery module or the external device and ensuring the stable transmission of electric energy.

[0041] Further, the diameter of the boss portion 23 is smaller than the diameter of the positioning portion 22. When welding the positioning portion 22 and the positioning groove 12, the operator can more conveniently align the welding tool to the connecting position of the positioning portion 22 and the positioning groove 12, so that the welding energy is uniformly distributed on the contact surface of the positioning portion 22 and the positioning groove 12, the welding quality is improved, the firm connection of the two is ensured, and the stability of the busbar overall structure is further guaranteed, which is conducive to the stable transmission of electric energy. At the same time, the boss portion 23 is a certain distance away from the welding position of the positioning portion 22 and the positioning groove 12, which can also prevent the influence of the welding process on the flatness of the connecting surface of the boss portion 23. Since the welding operation is mainly concentrated between the positioning portion 22 and the positioning groove 12, the smaller diameter boss portion 23 is away from the welding heat affected zone and the spatter generation area, avoiding the deformation of the boss portion 23 caused by high temperature welding, and reducing the possibility of welding spatter adhering to the connecting surface of the boss portion 23, so as to ensure that the flatness of the connecting surface is not damaged and maintain good electrical contact performance with the battery module or external equipment.

[0042] Further, the positioning portion 22 and the boss portion 23 are coaxially arranged, so that the boss portion 23 is located at the center of the positioning portion 22, and the distance from the circumferential side of the boss portion 23 to the welding position is equal at each position. The welding heat affected zone and spatter can be effectively controlled, the deformation and pollution of the connecting surface of the boss portion 23 are reduced, the flatness and good electrical contact performance are ensured, and the coaxial arrangement of the positioning portion 22 and the boss portion 23 facilitates processing.

[0043] In another optional embodiment, the connecting piece 2 can also be cylindrical, and the positioning groove 12 is also circular. The circular structure enables the connecting piece 2 to be self-centered when placed in the positioning groove 12, and it can be more easily aligned to the center position from any direction, greatly improving the assembly efficiency. During the welding process, the circular contact surface can ensure that the welding energy is uniformly distributed on the circumference, there is no edge effect, and the situation of insufficient or overheating local welding is avoided, further improving the welding quality.

[0044] In this embodiment, the height of the connecting piece 2 is equal to the depth of the positioning groove 12. When the height of the connecting piece 2 is equal to the depth of the positioning groove 12, the connecting piece 2 can be completely embedded in the positioning groove 12, and better positioning and support are obtained in the direction perpendicular to the plane of the aluminum bar 1. This can effectively prevent the connecting piece 2 from being displaced in the height direction when subjected to external forces (such as vibration, impact, etc.), further enhancing the connection stability between the connecting piece 2 and the aluminum bar 1, and ensuring the structural integrity of the busbar. In other embodiments, the height of the connecting piece 2 can be greater than the depth of the positioning groove 12, and the connecting piece 2 protrudes above the surface of the aluminum bar 1.

[0045] It is worth mentioning that the connecting piece 2 and the positioning groove 12 can be triangular, quadrilateral or polygonal, as long as they are matched, and the shape of the connecting piece 2 and the positioning groove 12 is not limited here.

[0046] In this embodiment, the outer surface of the connecting piece 2 is plated with a protective layer, which can effectively isolate the connecting piece 2 from the external environment, enhance the corrosion resistance of the connecting piece 2, and at the same time, reduce the contact resistance of the connecting piece 2, make the power transmission more efficient, reduce the energy loss, and improve the overall performance of the battery pack. Specifically, the protective layer plated on the outer surface of the connecting piece 2 can be selected from low-resistance metals such as nickel, tin, silver, etc.

[0047] In this embodiment, the first connecting hole 11 is provided at both ends of the aluminum row 1, and the positioning groove 12 is provided around the side of the first connecting hole 11, that is, the first connecting hole 11 is provided at the bottom of the positioning groove 12, and the hole diameter is smaller than the inner diameter of the positioning groove 12. The second connecting hole 21 coaxial with the first connecting hole 11 is provided on the connecting piece 2, and the connecting piece 2 is connected with the battery module or external equipment through the fastener, and the fastener is arranged in the second connecting hole 21 and the first connecting hole 11. This design enhances the connection convenience and versatility of the connecting piece 2 and the battery module or external equipment, and improves the connection stability.

[0048] It is worth mentioning that the fastener can be selected from bolts, screws or rivets, as long as the stable connection of the connecting piece 2 and the battery module or external equipment is ensured, and the type of the fastener is not limited.

[0049] In this embodiment, the second connecting hole 21 at one end of the aluminum row 1 and the first connecting hole 11 on the connecting piece 2 at the corresponding position are waist-shaped holes, and the second connecting hole 21 at the other end and the first connecting hole 11 on the connecting piece 2 at the corresponding position can be selected as round holes. The design of the waist-shaped hole facilitates the adjustment of the position between the parts, so that there is a certain position adjustment allowance when installing the connecting piece 2 and the battery module or external equipment, which can effectively cope with the position deviation problem of the parts caused by machining error or assembly error, improve the success rate of assembly, reduce the reprocessing or adjustment of parts due to small errors, save the assembly time and cost.

[0050] Alternatively, the second connecting hole 21 at both ends of the aluminum row 1 and the first connecting hole 11 on the connecting piece 2 at the corresponding position are waist-shaped holes, which further enhances the adaptability of the connecting piece 2 and the battery module or external equipment assembly, and can be quickly installed in complex environments, reducing the requirement for position alignment. Alternatively, the second connecting hole 21 at both ends of the aluminum row 1 and the first connecting hole 11 on the connecting piece 2 at the corresponding position are round holes, which can also complete the assembly of the connecting piece 2 and the battery module or external equipment.

[0051] In the embodiment, the outer surface of the aluminum bar 1 is coated with an insulating layer 3. The insulating layer 3 can ensure that the busbar is not in contact with another busbar or other live equipment after the installation of the busbar is completed, preventing short circuit phenomenon and improving the use safety of the busbar. Specifically, as shown in Figure 1 and Figure 2 The insulating layer 3 coats each of the circumferences of the aluminum bar 1 except the two ends of the aluminum bar 1, so that the two ends of the aluminum bar 1 are exposed and can be conveniently welded or connected with the connecting piece 2, while avoiding the interference of the insulating layer 3 on the connection process.

[0052] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A busbar, characterized in that The utility model relates to an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

2. The busbar of claim 1, wherein The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

3. The busbar of claim 1, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

4. The busbar of claim 3, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

5. The busbar of claim 4, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

6. The busbar of claim 1, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

7. The busbar of claim 1, wherein The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

8. The busbar of claim 7, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

9. The busbar of claim 1, wherein, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection.

10. A battery pack comprising a plurality of battery modules and the busbar according to any one of claims 1 to 9, characterized in that, The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. The utility model discloses an aluminum busbar and connecting piece, and belongs to the field of battery module connection. 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