Busbar for battery cell module, battery cell module and manufacturing method thereof

Abstract

The present invention discloses a busbar for a cell module, a cell module and a manufacturing method thereof. The busbar for the cell module includes a plurality of busbar monomers connected in sequence to form a sheet-like busbar body. The busbar monomer includes a plate body, and at least one rectangular accommodating groove is provided on the plate body. A welding brazing material is provided in the rectangular accommodating groove, and the welding brazing material is higher than the surface of the plate body. When the busbar is welded to the cell module, the welding efficiency is high. The positions of the welding points of the cell and the busbar are determined. Then, according to the positions of the welding points, the electric soldering iron is contacted with all welding positions at the same time to melt all the welding brazing materials. By detecting whether the protruding height of the welding brazing material is eliminated, it can be quickly determined whether the welding of all welding points is completed. The welding is reliable, and it can be visually detected whether the welding of the welding points is completely welded. In addition, the recycling rate is high. The waste modules generated after sales can be recycled and reused by the electric soldering tooling to recycle the good cells and busbars.

Description

Technical Field

[0001] The present invention relates to the field of battery cells, and in particular to a busbar for a battery cell module, a battery cell module and a manufacturing method thereof. Background Art

[0002] The conventional connection process of existing battery cell modules includes bolt connection and laser welding, among which:

[0003] Bolt connection: The advantage is that it can meet the connection of buses of different thicknesses and it is convenient for after-sales service; its disadvantages are that the module is heavy, the energy density is low, the assembly time is long, the bolts become loose due to long-term vibration, the module has a large internal resistance, and the module generates obvious heat, which affects the module life.

[0004] Laser welding: It is a mature module bus welding method at present, with the advantages of high welding efficiency, low pollution and reliable welding; the disadvantages are high after-sales cost, non-reusability and difficulty in detecting cold welds. Summary of the invention

[0005] The main purpose of the present invention is to provide a busbar for a battery cell module, a battery cell module and a manufacturing method thereof, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention proposes a busbar for a battery cell module, comprising a plurality of busbar units connected in sequence to form a sheet-like busbar body, wherein the busbar unit comprises a plate body, wherein the plate body is provided with at least one rectangular accommodating groove, wherein welding solder is provided in the rectangular accommodating groove, and the welding solder is higher than the surface of the plate body.

[0007] In one embodiment, there are a plurality of rectangular containing grooves, and the plurality of rectangular containing grooves are evenly spaced apart along the length direction of the plate body, and the welding brazing material is disposed in each of the rectangular containing grooves.

[0008] In one embodiment, upper surfaces of the plurality of solders are located on the same plane.

[0009] In one embodiment, the side edges of the plate bodies are provided with bent connection portions, and adjacent plate bodies are connected via the bent connection portions.

[0010] In one embodiment, a nickel sheet is disposed on the back of the plate.

[0011] In one embodiment, the thickness of the nickel sheet is 0.1 mm.

[0012] In one embodiment, a nickel layer is applied on the back of the plate.

[0013] In one embodiment, the nickel layer has a thickness of 10-20 nm.

[0014] In addition, the present invention further provides a battery cell module, wherein the battery cell module comprises at least one busbar for the battery cell module as described above.

[0015] In addition, the present invention also provides a method for manufacturing a battery cell module, the method comprising:

[0016] Hot pressing a nickel sheet or laying a nickel layer on the plate;

[0017] Punching out at least one rectangular receiving groove on the plate body;

[0018] Punching and bending connecting parts on the plate body;

[0019] Filling the rectangular containing groove with soldering material and heat-bonding the soldering material;

[0020] Place the board on the welding position of the battery core, and press the solder with an electric soldering iron and continue pressing until the solder is melted by the electric soldering iron and the electric soldering iron contacts the board, which means the welding process is completed.

[0021] In the technical solution of the present invention, the busbar for the battery module includes a plurality of busbar monomers connected in sequence to form a sheet-like busbar body, and the busbar monomer includes a plate body, and at least one rectangular accommodating groove is provided on the plate body, and a welding brazing material is provided in the rectangular accommodating groove, and the welding brazing material is higher than the surface of the plate body. Therefore, when the busbar is connected to the battery module by welding, the welding efficiency is high, and the positions of the welding points of the battery cell and the busbar are determined. Then, according to the positions of the welding points, the electric soldering iron is contacted with all the welding positions at the same time to melt all the welding brazing materials. By detecting whether the protruding height of the welding brazing material is eliminated, it can be quickly determined whether the welding of all the welding points is completed, and the welding is reliable, and it can be visually detected whether the welding of the welding points is completely welded. And the recycling rate is high, and the waste modules generated after sales can be recycled and reused by the electric soldering tooling to recycle the good battery cells and busbars. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a busbar for a battery module according to an embodiment of the present invention;

[0024] Figure 2 A side view of a busbar for a battery module according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of a battery cell module according to an embodiment of the present invention.

[0026] Description of the accompanying drawings: 10, busbar; 11, plate body; 12, rectangular receiving groove; 13, soldering filler metal; 14, bent connecting portion; 15 nickel sheet; 100, busbar; 200, battery cell.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] 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.

[0030] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. 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.

[0032] The invention provides a busbar for a battery core module.

[0033] like Figure 1 As shown, the busbar 100 for the battery cell module provided in the embodiment of the present invention includes a plurality of busbar units 10 connected in sequence to form a sheet-like busbar body, wherein the busbar unit 10 includes a plate body 11, wherein at least one rectangular receiving groove 12 is provided on the plate body 11, wherein a welding solder 13 is provided in the rectangular receiving groove 12, and wherein the welding solder 13 is higher than the surface of the plate body 11.

[0034] In this embodiment, when the busbar 100 is welded to the battery module, the welding efficiency is high, the welding point position of the battery 200 and the busbar 100 is determined, and then the electric soldering iron is simultaneously contacted with all welding positions according to the welding point position, so that all welding solders 13 are melted, and by detecting whether the protruding height of the welding solder 13 is eliminated, it can be quickly determined whether the welding of all welding points is completed, the welding is reliable, and it can be visually detected whether the welding points are completely welded. And the recycling rate is high, the waste modules generated after sales can be recycled and reused by the electric soldering tooling to recycle the good battery 200 and busbar 100.

[0035] In a preferred embodiment, there are a plurality of rectangular receiving grooves 12 , and the plurality of rectangular receiving grooves 12 are evenly spaced apart along the length direction of the plate body 11 . The welding brazing material 13 is disposed in each of the rectangular receiving grooves 12 .

[0036] Specifically, the upper surfaces of the plurality of soldering materials 13 are located on the same plane, so that the soldering iron will not tilt when pressing the soldering material 13, and the soldering iron can stably contact the surface of the board 11 after the soldering material 13 is melted.

[0037] In one embodiment, the side edge of the plate body 11 is provided with a bent connection portion 14, and the adjacent plate bodies 11 are connected by the bent connection portions 14. The buffering performance between the plate bodies 11 is improved by providing the bent connection portions 14.

[0038] In addition, a nickel sheet 15 or a nickel layer is provided on the back of the plate body 11 to increase the adhesion of the solder 13. The thickness of the nickel sheet 15 is 0.1 mm, and the thickness of the nickel layer is 10-20 nm.

[0039] In addition, the present invention further provides a battery cell module, wherein the battery cell module includes at least one busbar 100 for the battery cell module as described above.

[0040] In addition, the present invention also provides a method for manufacturing a battery cell module, the method comprising:

[0041] Hot pressing a nickel sheet 15 or laying a nickel layer on the plate body 11;

[0042] At least one rectangular receiving groove 12 is punched out on the plate body 11;

[0043] Punching and bending the connecting portion 14 on the plate body 11;

[0044] Fill the rectangular receiving groove 12 with soldering material 13, and heat-bond the soldering material 13;

[0045] The plate 11 is placed on the welding position of the battery cell 200, and the soldering iron is pressed on the solder 13 and pressed continuously until the solder 13 is melted by the soldering iron and the soldering iron contacts the plate 11, which means the welding process is completed.

[0046] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A busbar for a battery module, characterized in that: The busbar for the battery cell module includes a plurality of busbar units connected in sequence to form a sheet-like busbar body, wherein the busbar unit includes a plate body, wherein at least one rectangular receiving groove is opened on the plate body, wherein welding solder is arranged in the rectangular receiving groove, and wherein the welding solder is higher than the surface of the plate body; wherein the number of the rectangular receiving grooves is multiple, wherein the multiple rectangular receiving grooves are evenly spaced apart along the length direction of the plate body, wherein the welding solder is arranged in the rectangular receiving grooves; wherein the upper surfaces of the multiple welding solders are located on the same plane.

2. The busbar for a battery cell module according to claim 1, characterized in that: The side edge of the plate body is provided with a bent connection portion, and the adjacent plate bodies are connected through the bent connection portions.

3. The busbar for a battery cell module according to claim 1, characterized in that: A nickel sheet is arranged on the back of the plate body.

4. The busbar for a battery cell module according to claim 3, characterized in that: The thickness of the nickel sheet is 0.1 mm.

5. The busbar for a battery cell module according to claim 1, characterized in that: A nickel layer is provided on the back of the plate body.

6. The busbar for a battery cell module according to claim 5, characterized in that: The thickness of the nickel layer is 10-20 nm.

7. A battery cell module, characterized in that: The battery cell module comprises at least one busbar for the battery cell module according to any one of claims 1 to 6.

8. A method for manufacturing a battery cell module, characterized in that: For manufacturing the battery cell module according to claim 7, the method comprises: Hot pressing a nickel sheet or laying a nickel layer on the plate; Punching out at least one rectangular receiving groove on the plate body; Punching and bending connecting parts on the plate body; Filling the rectangular containing groove with soldering material and heat-bonding the soldering material; Place the board on the welding position of the battery core, and press the solder with an electric soldering iron and continue pressing until the solder is melted by the electric soldering iron and the electric soldering iron contacts the board, which means the welding process is completed.

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