WO2021135191A1

WO2021135191A1 - Solderless busbar

Info

Publication number: WO2021135191A1
Application number: PCT/CN2020/105068
Authority: WO
Inventors: 沈炳杰; 蔡毅; 李小辉; 程骞; 张雅; 林志宏
Original assignee: 合肥国轩高科动力能源有限公司
Priority date: 2019-12-30
Filing date: 2020-07-28
Publication date: 2021-07-08
Also published as: CN211265597U

Abstract

The present invention provides a solderless busbar. The busbar comprises a busbar body. The busbar body is provided with an electrode connection portion for contacting and connecting conductive tabs. Two ends of the busbar body are bent towards the same side to form side edges respectively, an end portion of each side edge continues to be bent to form the respective electrode connection portion, an end of the electrode connection portion is of a cantilever structure, and the electrode connection portion connects adjacent conductive tabs by means of contact. In the present invention, the busbar is designed to be bent, and by means of the elasticity and the special structure of its own, the busbar can be always in a contact state with the conductive tabs, without the need to weld the conductive tabs to the busbar, thereby simplifying the mounting process.

Description

A non-welded busbar

Technical field

The invention relates to the technical field of lithium ion batteries, in particular to a non-welding type bus bar.

Background technique

Lithium-ion batteries are more and more widely used in new energy vehicles and energy storage systems. Lithium battery systems include several battery modules, and battery modules are composed of several single cells in series and parallel. That is, when batteries are assembled into battery modules, the batteries need to be connected in series and parallel. There are usually two ways to connect adjacent batteries. One is to directly connect the lead ears by ultrasonic welding, and the second is One way is to use the bus bar as a transfer, that is, the conductive electrode ears are laser welded to the bus bar to form a conductive channel. Both of these two connection methods need to weld the lead electrode lugs, which require a lot of equipment and a complicated process, and it is inconvenient to disassemble when the battery core is to be replaced later, which will cause waste. In addition, the existing busbar parts have high rigidity, and during use, due to vibration, relative displacement between the cells will occur, which will cause the solder joints to loosen and fail to perform the function of diversion.

Summary of the invention

One purpose of the present invention is to provide a solderless busbar for lithium ion batteries to realize solderless connection.

Another object of the present invention is to provide a lithium-ion battery module.

In order to achieve the above objectives, the present invention provides the following technical solutions:

A non-welding type bus bar, the bus bar includes a bus bar body, and the bus bar body is provided with an electrode connection part for contact and conduction with a lead electrode lug.

In a further solution, both ends of the busbar body are bent to the same side to form side edges, respectively, and the ends of the side edges continue to be bent to form the electrode connection part, and the end of the electrode connection part is In a cantilever structure, the electrode connecting portion is used to connect adjacent conductive electrode ears through contact.

That is, the bus bar created by the present invention realizes current conduction through direct contact between the electrode connection part and the conductive electrode lugs, without welding the conductive electrode lugs and the bus bar, the connection is simple and the operation is convenient.

An implementation manner created by the present invention is that the side edge is located above the busbar body, the electrode connection part is formed by bending the side edge to the outside and downward, and the electrode connection part is formed between the electrode connection part and the side edge for insertion. Set the lug groove of the lead lug, and the notch of the lug groove faces downward.

In a further solution, the end of the electrode connecting portion protrudes in a lateral direction to form an arc-shaped buckle portion.

The second implementation method created by the present invention is that the side edge is located above the busbar body, the electrode connection part is formed by bending the side edge to the inside and downward, and an opening is formed between the electrode connection part and the side edge. The cavity under.

In a further solution, the electrode connecting portion is wave-shaped, and a convex edge is formed on the outer end surface thereof. The ribs can be arranged horizontally and/or vertically.

In a further solution, the material of the bus bar is copper or aluminum.

In a further solution, the busbar body is flat.

In a further solution, the electrode connecting portion is an elastic cantilever structure.

In a further solution, a conductive glue is coated or a conductive sheet is fixedly provided on one side of the electrode connecting portion for contacting the conductive electrode lug.

On the other hand, the present invention also provides a lithium-ion battery module, which includes the solderless busbar described in the present invention.

In a further solution, in the lithium-ion battery module, a cover plate is installed above the bus bar, and the bottom end of the bus bar is fixed on a bracket, and the bracket is provided with a tab hole matching the lead electrode lug.

In some embodiments, for the bus bar included in the lithium-ion battery module, the electrode connection part is formed by bending the side to the outside and downward, and the electrode connection part is formed between the electrode connection part and the side for inserting the conductive electrode The lug groove of the ear, the notch of the lug groove faces downwards, the lead electrode lug passes through the lug hole and then is inserted into the lug groove of the busbar. After the cover plate is installed, the card post on the cover plate is stuck in An external pressure is applied to the two outer sides of the electrode connection part to deform and squeeze the electrode connection part in a lateral direction, thereby pressing the lead electrode lug of the electric core on the bus bar to form a conductive loop.

In other embodiments, for the bus bar included in the lithium-ion battery module, the electrode connection portion is formed by bending the side edge toward the inside and downward, and an opening is formed between the electrode connection portion and the side edge downward. The lead electrode lug is bent into a hook shape after passing through the electrode lug hole, and then it is sleeved on the outer periphery of the electrode connection part. After the cover plate is installed, the clamp post on the cover plate is clamped in the two electrode connection part An external pressure is applied to the electrode connecting part in the middle of the battery to make the contact with the conductive electrode ears closer, thereby pressing the conductive electrode ears of the battery core on the bus bar to form a conductive loop.

The bus bar created by the present invention is made of conductive material, which can be conducted when it is in contact with the lead electrode ear. In addition, the present invention designs the bus bar into a bent shape, and uses its own elasticity and special structure to keep it in constant contact with the lead electrode lugs, without the need to weld the lead electrode lugs to the bus bar again. This greatly simplifies the process, and has great benefits for later maintenance, including the use of cascades.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the busbar in embodiment 1;

Fig. 2 is a schematic diagram of the connection between the bus bar and the battery in Fig. 1;

Figure 3 is a schematic diagram of the structure of the busbar in Embodiment 2;

Fig. 4 is a schematic diagram of the connection between the bus bar and the battery in Fig. 3;

FIG. 5 is a schematic diagram of the structure of the busbar in Embodiment 3;

Fig. 6 is a schematic diagram of the connection between the bus bar and the battery in Fig. 5.

In the figure: 1- bus body, 2- side, 3- electrode connection part, 4- arc buckle part, 5- rib, 71- first bus bar, 72- second bus bar, 8- electric Core, 81-lead electrode ear, 9-cover plate, 10-bracket.

Detailed ways

The following will clearly and completely describe the technical solutions in the creative embodiments of the present invention in conjunction with the accompanying drawings in the creative embodiments of the present invention. Obviously, the described embodiments are only a part of the creative embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Figures 1 to 6, in the inventive embodiment of the present invention, a non-welding type bus bar, the bus bar includes a bus bar body 1, the bus bar body 1 is provided with a conductive electrode lug contact Connected electrode connection part 3.

In a further solution, both ends of the busbar body 1 are bent to the same side to form side edges 2, respectively, and the ends of the side edges 2 continue to be bent to form the electrode connection part 3, and the electrode connection The end of the part 3 is a cantilever structure, and the electrode connecting part 3 connects adjacent conductive electrode ears through contact.

In a further solution, the material of the bus bar is made of conductive materials such as copper or aluminum.

In order to increase the over-current capability, a conductive glue is applied or a conductive sheet is fixed on one side of the contact surface of the electrode connecting portion 3 and the conductive electrode lug.

Example 1:

As shown in Figures 1 and 2, the first busbar 71 includes a flat-plate busbar body 1. Both ends of the busbar body 1 are bent to the same side to form a side edge 2 respectively, and the side edge 2 is located at Above the busbar body 1, the electrode connecting portion 3 is formed by bending the side 2 to the outside and downward, and a lug groove for inserting the electrode lug is formed between the electrode connecting portion 3 and the side 2, and The notch of the lug groove faces downward.

In a further solution, the end of the electrode connecting portion 3 protrudes toward the side 2 to form an arc-shaped buckle portion 4.

When in use, as shown in FIG. 2, the lead lug 81 of the cell 8 is inserted into the lug groove formed between the electrode connecting portion 3 and the side 2, which relies on external pressing to form a contact to conduct current. In addition, the end of the electrode connecting portion 3 is projected toward the side 2 to form an arc-shaped buckle portion 4, so that the arc-shaped buckle portion 4 is always in contact with the electrode lug 81, so that the electrode lug 81 is connected to the electrode The contact between the parts 3 is closer; furthermore, because the conductive electrode lug 81 and the electrode connecting portion 3 are in elastic contact, even when the relative displacement between the cells occurs due to vibration during use, the conductive electrode lug It also maintains constant contact with the electrode connection part.

Example 2:

As shown in Figures 3 and 4, the second busbar 72 includes a flat busbar body 1. The two ends of the busbar body 1 are bent to the same side to form a side edge 2 respectively, and the side edge 2 is located at Above the busbar body 1, the electrode connecting portion 3 is formed by bending the side 2 inward and downward, and a cavity with a downward opening is formed between the electrode connecting portion 3 and the side 2.

In a further solution, the electrode connecting portion 3 is wavy, and a convex rib 5 is formed on its outer end surface. The rib 5 may be horizontal as shown in FIG. 3 or vertical, and its purpose is to maintain a better contact and conduction state between the conductive electrode lug 81 and the electrode connecting portion 3.

When in use, as shown in Figure 4, the end of the conductive electrode lug 81 of the battery cell 8 is bent into a hook shape, and it is clipped on the outer periphery of the electrode connecting portion 3. The rib 5 on the outer end surface of the electrode connecting portion 3 can make The conductive lug 81 and the electrode connecting portion 3 maintain a better contact and conduction state. Since the electrode connecting portion 3 is of an elastic cantilever structure, in the case of an external force squeezing, there will be a reverse elastic force to make the contact with the lead electrode lug 81 closer.

Example 3:

The application of the bus bar in Embodiment 1 and Embodiment 2 is specifically as follows:

As shown in FIG. 5, a connection structure of a lithium ion battery module, a cover plate 9 is installed above the first bus bar 71, and the bottom end of the first bus bar 71 is fixed on the bracket 10, and the bracket 10 is opened There is a lug hole that matches the lead lug 81, the lead lug 81 passes through the lug hole and then is inserted into the lug groove on the first busbar 71, and the cover 9 is installed. The clamping posts are clamped on the two outer sides of the electrode connection part 3, and an external pressure is applied to the electrode connection part 3 to deform and squeeze the electrode connection part 3 in the direction of the side 2, thereby pressing the lead electrode lug 81 of the cell 8 on the first A conductive loop is formed on a bus bar 71.

As shown in FIG. 6, a connecting structure of a lithium-ion battery module, a cover plate 9 is installed above the second bus bar 72, and the bottom end of the second bus bar 72 is fixed on the bracket 10, and the bracket 10 is opened There is a lug hole that matches the electrode lug 81, the lug 81 passes through the lug hole and then bends into a hook shape, and then is sleeved on the outer periphery of the electrode connecting portion 3, and the cover plate 9 is installed, The clamping post on the cover plate is stuck in the middle of the two electrode connecting parts 3, and an external pressure is applied to the electrode connecting part 3. Since the electrode connecting part 3 is an elastic cantilever structure, there will be a reverse elastic force when there is an external force. , So that the contact between the conductive electrode ear 81 and the conductive electrode ear 81 is closer, so that the conductive electrode ear 81 of the cell 8 is pressed against the second bus bar 72 to form a conductive loop.

Although this specification is described in accordance with the implementation manners, not each implementation manner only includes an independent technical solution. This narrative manner in the specification is only for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions of can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Therefore, the foregoing descriptions are only preferred embodiments created by the present invention, and are not used to limit the scope of implementation of the invention; that is, all equivalent changes made according to the invention are within the protection scope of the invention.

Claims

A non-welding type bus bar, the bus bar includes a bus bar body (1), characterized in that the bus bar body (1) is provided with an electrode connecting portion (3) for contact and conduction with a conductive electrode lug. ).
The non-welded busbar according to claim 1, characterized in that the two ends of the busbar body (1) are bent to the same side to form a side (2), and the side (2) The end portion continues to be bent to form the electrode connecting portion (3), the end of the electrode connecting portion (3) is a cantilever structure, and the electrode connecting portion (3) is used to contact adjacent lead electrode ears through Conduction.
The solderless busbar according to claim 2, characterized in that the side edge (2) is located above the busbar body (1), and the electrode connecting portion (3) is directed from the side edge (2) to It is formed by bending the outer and lower sides, and a lug groove for inserting the electrode lug is formed between the electrode connecting portion (3) and the side edge (2), and the notch of the lug groove faces downward.
The non-welded busbar according to claim 3, characterized in that the end of the electrode connecting portion (3) protrudes toward the side (2) to form an arc-shaped buckle portion (4).
The solderless busbar according to claim 2, characterized in that the side edge (2) is located above the busbar body (1), and the electrode connecting portion (3) is directed from the side edge (2) to The inner side is bent and formed, and a cavity with a downward opening is formed between the electrode connecting portion (3) and the side edge (2).
The non-welded busbar according to claim 5, characterized in that the electrode connecting portion (3) is wavy, and a convex edge (5) is formed on its outer end surface; preferably, the convex edge (5) ) Is horizontal and/or vertical.
The solderless bus bar according to claim 1, wherein the material of the bus bar is copper or aluminum.
The non-welded busbar according to claim 1, wherein the busbar body is flat.
The solderless busbar according to claim 1, wherein the electrode connecting portion (3) is an elastic cantilever structure.
The solderless busbar according to claim 1, characterized in that a conductive glue or a conductive sheet is fixed on one side of the electrode connecting portion (3) for contacting the electrode lug.
A lithium ion battery module, characterized in that the lithium ion battery module comprises the solderless busbar according to any one of claims 1-10.
The lithium-ion battery module according to claim 11, wherein a cover plate is installed above the bus bar, the bottom end of the bus bar is fixed on the bracket, and the bracket is provided with a pole matching the lead electrode lug. Ear holes.
The lithium-ion battery module according to claim 12, wherein the lithium-ion battery module comprises the solderless busbar according to claim 3 or 4, and the conductive electrode lug is inserted through the lug hole In the lug groove of the busbar, after the cover plate is installed, the clamping posts on the cover plate are clamped on the two outer sides of the electrode connection part to apply an external pressure to the electrode connection part, so that the electrode connection part is deformed and squeezed in the lateral direction. Thus, the conductive electrode ears of the battery are pressed tightly on the bus bar to form a conductive loop.
The lithium-ion battery module according to claim 12, wherein the lithium-ion battery module comprises the solderless busbar according to claim 5 or 6, and the lead lugs pass through the lug holes and then be folded Bent into a hook shape, and then sleeve it on the outer periphery of the electrode connection part. After the cover plate is installed, the clamp post on the cover plate is clamped in the middle of the two electrode connection parts to apply an external pressure to the electrode connection part to make it contact with the conductive electrode. The contact between the ears is closer, so that the conductive electrode ears of the battery core are pressed against the bus bar to form a conductive loop.