Battery core connecting assembly

Abstract

The invention provides a battery core connecting assembly which comprises a bus electrode plate, a first battery welding plate and a second battery welding plate. The bus electrode plate is provided with two battery core connecting plates and an external end connecting plate; the two battery core connecting pieces extend to the side edge of the external end connecting piece, and a spacing distance is formed between the two battery core connecting pieces. The first battery welding piece is provided with a first combination part and two first branches. The two first branches extend to the first combination part in a forked mode, and each first branch is provided with a first welding end. And the middle sections of the two first branches are respectively combined with the battery core connecting pieces. The second battery welding piece is provided with a second combination part and two second branches, the second branches extend to the second combination part in a forked mode, and each second branch is provided with a second welding end. And the middle sections of the two second branches are respectively combined with the battery core connecting pieces.

Description

Technical Field

[0001] This invention relates to battery conductive frames in battery packs, and more particularly to a battery cell connection assembly. Background Technology

[0002] Secondary batteries mainly include nickel-metal hydride batteries, nickel-cadmium batteries, lithium-ion batteries, and lithium polymer batteries. Lithium batteries have advantages such as high energy density, high operating voltage, wide operating temperature range, no memory effect, long life, and the ability to withstand multiple charge and discharge cycles. They are widely used in portable electronic products such as mobile phones, laptops, and digital cameras, and in recent years have expanded into the automotive field.

[0003] A battery cell mainly consists of a positive electrode material, an electrolyte, a negative electrode material, a separator, and a casing. The separator separates the positive and negative electrode materials to prevent short circuits, while the electrolyte is contained within the porous separator and serves to conduct ionic charges. The casing encapsulates the positive electrode material, separator, electrolyte, and negative electrode material, and is typically made of metal.

[0004] In use, multiple battery cells are connected in series and / or parallel via a battery conductive frame to form a battery pack, allowing the battery pack to output the voltage required by the product. Generally, the battery conductive frame and battery cells are connected by electric welding.

[0005] Existing battery conductive frames consist of a single welded copper sheet extending into battery tabs (TABs). When multiple battery cells are combined, multiple sets of battery tabs need to extend from the resistance-welded copper sheet. In this structure with a single welded copper sheet, the arrangement of each set of battery tabs occupies a certain amount of space, affecting the battery pack's cell density. Furthermore, extending multiple sets of battery tabs from a single welded copper sheet also results in excessively high manufacturing costs. Summary of the Invention

[0006] Based on the above-mentioned technical issues, this invention proposes a battery cell connection assembly to reduce the manufacturing cost and space occupied by the battery conductive mechanism.

[0007] To achieve the above objectives, the present invention proposes a battery cell connection assembly, comprising a busbar electrode plate, a first battery welding plate, and a second battery welding plate. The busbar electrode plate has two battery cell connecting plates and an external end connecting plate. The two battery cell connecting plates extend from the sides of the external end connecting plate, and are spaced apart. The first battery welding plate has a first joint portion and two first branches. The two first branches extend bifurcatedly from the first joint portion, and each first branch has a first welding end. The middle sections of the two first branches are respectively connected to each battery cell connecting plate. The second battery welding plate has a second joint portion and two second branches, the second branches extending bifurcatedly from the second joint portion, and each second branch has a second welding end. The middle sections of the two second branches are respectively connected to each battery cell connecting plate.

[0008] Preferably, the two battery cell connecting pieces are at an angle to the external end connecting piece.

[0009] Preferably, the two battery cell connecting pieces extend vertically to the side of the outer end connecting piece.

[0010] Preferably, in at least one embodiment, a groove is formed on the first welding end to divide the first welding end into two parts.

[0011] Preferably, in at least one embodiment, a first welding portion is provided on the first joint portion, and a groove is opened in the first joint portion to divide the first welding portion into two parts.

[0012] Preferably, a groove is formed on the second welding end to divide the second welding end into two parts.

[0013] Preferably, the second joint is provided with a second welding part, and the second joint is provided with a groove to divide the second welding part into two parts.

[0014] Preferably, the busbar electrode sheet has two first positioning holes, respectively formed on the two battery cell connecting sheets; the first battery welding sheet has two second positioning holes, respectively disposed on the two first branches, and the interval between the two second positioning holes is equal to the interval between the two first positioning holes; the second battery welding sheet has two third positioning holes, respectively disposed on the two second branches, and the interval between the two third positioning holes is equal to the interval between the two first positioning holes; and the two first positioning holes, two second positioning holes, and two third positioning holes overlap each other to facilitate the positioning of the first battery welding sheet, the busbar electrode sheet, and the second battery welding sheet.

[0015] Preferably, the battery cell connection assembly consists of, from top to bottom, a first battery welding piece, a busbar electrode piece, and a second battery welding piece.

[0016] Preferably, the first joint is located away from the outer end connecting piece, and the second joint is located between the bases of the two battery cell connecting pieces.

[0017] This invention disassembles the electrode sheet connecting multiple battery cells into multiple parts for individual processing. The structure of each part, namely the first battery welding piece, the busbar electrode piece, and the second battery welding piece of this invention, can be greatly simplified to facilitate rapid manufacturing (e.g., it can be completed using a single stamping process), effectively reducing costs. Furthermore, the overlapping configuration of the first battery welding piece, the busbar electrode piece, and the second battery welding piece can also effectively reduce the space occupied by the battery cell connection assembly. Attached Figure Description

[0018] Figure 1 This is an exploded perspective view of the battery cell connection assembly according to an embodiment of the present invention.

[0019] Figure 2 This is a perspective view of the battery cell connection assembly according to an embodiment of the present invention.

[0020] Figure 3 This is another perspective view of the battery cell connection assembly according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached drawings: 100 - Battery cell connection assembly; 110 - First battery welding piece; 111 - First joint; 111a - First welding part; 111b, 113b, 122b, 124b - Slots; 112 - Second positioning hole; 113 - First branch; 113a - First welding end; 120 - Second battery welding piece; 122 - Second joint; 122a - Second welding part; 123 - Third positioning hole; 124 - Second branch; 124a - Second welding end; 130 - Busbar electrode piece; 131 - First positioning hole; 132 - Battery cell connecting piece; 134 - External end connecting piece; 200 - Battery cell. Detailed Implementation

[0022] Please see Figure 1 as well as Figure 2 As shown, a battery cell connection assembly 100 proposed in an embodiment of the present invention includes a bus electrode sheet 130, a first battery welding sheet 110 and a second battery welding sheet 120.

[0023] like Figure 1As shown, the busbar sheet 130 is made of a metal with high conductivity and ductility, such as copper. The high conductivity and ductility of the metal facilitate rapid processing operations such as stamping, thereby accelerating productivity and reducing processing costs. The busbar sheet 130 has two battery cell connecting pieces 132 and an external end connecting piece 134. The two battery cell connecting pieces 132 extend from the sides of the external end connecting piece 134, and there is a gap between the two battery cell connecting pieces 132. The two battery cell connecting pieces 132 each form an angle with the external end connecting piece 134; preferably, the angle is 90 degrees, that is, the two battery cell connecting pieces 132 extend perpendicularly from the sides of the external end connecting piece 134. Furthermore, the busbar sheet 130 also has two first positioning holes 131, respectively formed on the two battery cell connecting pieces 132.

[0024] like Figure 1 As shown, the first battery welding piece 110 is also made of a metal with high conductivity and ductility, such as copper. The first battery welding piece 110 has a first joint portion 111 and two first branches 113. The two first branches 113 extend branch-by-branch from the first joint portion 111, and each first branch 113 has a first welding end 113a. The bottom surface of the first welding end 113a is used for welding to the end of the battery cell 200. Specifically, a groove 113b can be further formed on the first welding end 113a to divide it into two parts. Simultaneously, protrusions can also be provided on the bottom surface of the first welding end 113a to facilitate welding the first welding end 113a to the end of the battery cell 200. The end of the battery cell 200 is not limited to the positive or negative terminal of the battery cell 200.

[0025] Furthermore, a first welding portion 111a is also provided on the first joint portion 111. A slot 111b can be formed on the first joint portion 111 to divide the first welding portion 111a into two parts. At the same time, protrusions can also be provided on the bottom surface of the first welding portion 111a to facilitate welding the first welding portion 111a to the end of the battery cell 200. That is to say, the first battery welding piece 110 can be welded to at least three battery cells 200.

[0026] In addition, the first battery welding piece 110 has two second positioning holes 112, which are respectively disposed on the two first branches 113, and the interval between the two second positioning holes 112 is equal to the interval between the two first positioning holes 131.

[0027] like Figure 1As shown, the second battery welding piece 120 is also made of a metal with high conductivity and ductility, such as copper. The second battery welding piece 120 has a second joint portion 122 and two second branches 124. The two second branches 124 extend branchingly from the second joint portion 122, and each second branch 124 has a second welding end 124a. The bottom surface of the second welding end 124a is used for welding to the end of the battery cell 200. Specifically, a groove 124b can be further formed on the second welding end 124a to divide it into two parts. Simultaneously, protrusions can also be provided on the bottom surface of the second welding end 124a to facilitate welding the second welding end 124a to the end of the battery cell 200. The end of the battery cell 200 is not limited to the positive or negative terminal of the battery cell 200.

[0028] Furthermore, a second welding portion 122a is also provided on the second joint portion 122. A slot 122b can be formed on the second joint portion 122 to divide the second welding portion 122a into two parts. At the same time, protrusions can also be provided on the bottom surface of the second welding portion 122a to facilitate welding the second welding portion 122a to the end of the battery cell 200. That is to say, the second battery welding piece 120 can be welded to at least three battery cells 200.

[0029] In addition, the second battery welding piece 120 has two third positioning holes 123, which are respectively disposed on the two second branches 124, and the interval between the two third positioning holes 123 is equal to the interval between the two first positioning holes 131.

[0030] Specifically, the first battery welding piece 110 and the second battery welding piece 120 can be identical components, differing only in their orientation during actual use. This simplifies the types of parts in the battery cell connection assembly 100, thus reducing costs.

[0031] Figure 2 The image shown is a perspective view of the battery cell connection assembly 100. The battery cell connection assembly 100 consists of, from top to bottom, a first battery welding piece 110, a bus electrode piece 130, and a second battery welding piece 120.

[0032] like Figure 2 As shown, specifically, the middle sections of the two first branches 113 are respectively coupled to an upper surface of each battery cell connecting piece 132, and the first coupling portion 111 is configured away from the external end connecting piece 134. The middle sections of the two first branches 113 are respectively coupled to a lower surface of each battery cell connecting piece 132, and the second coupling portion 122 is located between the bases of the two battery cell connecting pieces 132.

[0033] Furthermore, during the assembly process, the first positioning hole 131, the second positioning hole, and the third positioning hole can overlap each other to facilitate the positioning of the first battery welding piece 110, the busbar electrode piece 130, and the second battery welding piece 120, so as to facilitate welding the first battery welding piece 110, the busbar electrode piece 130, and the second battery welding piece 120 into one piece.

[0034] like Figure 2 and Figure 3 As shown, through the combination of the first battery welding piece 110, the bus electrode piece 130, and the second battery welding piece 120, the first battery welding piece 110 and the second battery welding piece 120 can each be welded to at least three battery cells 200, so that the battery cell connection assembly 100 can connect at least six batteries. The external end connecting piece 134 is used to connect to external circuitry to combine the battery cell connection assembly 100 and the corresponding battery cells 200 into a battery module.

[0035] Figure 3 The positive electrode of the battery cell 200 shown is only an example. In reality, the electrode connection method of the battery cell 200 can be determined according to the output and management requirements of the battery cell 200.

[0036] This invention separates the electrode plates connecting multiple battery cells into multiple parts for individual processing. The structure of each part, namely the first battery welding piece 110, the busbar electrode piece 130, and the second battery welding piece 120, can be greatly simplified to facilitate rapid manufacturing (e.g., it can be completed using a single stamping process), effectively reducing costs. Furthermore, the overlapping configuration of the first battery welding piece 110, the busbar electrode piece 130, and the second battery welding piece 120 can also effectively reduce the space occupied by the battery cell connection assembly 100.

[0037] The above description is illustrative only and not restrictive of the present invention. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of the present invention.

Claims

1. A battery cell connection assembly, characterized in that, Including: The busbar electrode has two battery cell connecting pieces and an external end connecting piece. The two battery cell connecting pieces extend to the side of the external end connecting piece, and there is a gap between the two battery cell connecting pieces. The first battery welding piece has a first joint and two first branches; wherein the two first branches extend from the first joint in a bifurcated manner, and each first branch has a first welding end; the middle sections of the two first branches are respectively joined to each battery cell connecting piece; The second battery welding piece has a second joint and two second branches. The two second branches extend from the second joint in a bifurcated manner, and each second branch has a second welding end. The middle sections of the two second branches are respectively joined to each battery cell connecting piece.

2. The battery cell connection assembly according to claim 1, characterized in that, The two battery cell connecting pieces are at an angle to the external end connecting piece.

3. The battery cell connection assembly according to claim 2, characterized in that, The two battery cell connecting pieces extend vertically to the side of the outer end connecting piece.

4. The battery cell connection assembly according to claim 1, characterized in that, A groove is made on the first welding end to divide the first welding end into two parts.

5. The battery cell connection assembly according to claim 1, characterized in that, The first joint is provided with a first welding part, and the first joint is provided with a groove to divide the first welding part into two parts.

6. The battery cell connection assembly according to claim 1, characterized in that, A groove is made on the second welding end to divide the second welding end into two parts.

7. The battery cell connection assembly according to claim 1, characterized in that, The second joint is provided with a second welding part, and the second joint is provided with a groove to divide the second welding part into two parts.

8. The battery cell connection assembly according to claim 1, characterized in that, The busbar electrode plate has two first positioning holes, which are respectively opened on the two battery cell connecting plates; The first battery welding piece has two second positioning holes, which are respectively disposed on the two first branches, and the interval between the two second positioning holes is equal to the interval between the two first positioning holes; The second battery welding piece has two third positioning holes, respectively disposed on the two second branches, and the interval between the two third positioning holes is equal to the interval between the two first positioning holes; and The two first positioning holes, the two second positioning holes, and the two third positioning holes overlap each other to facilitate the positioning of the first battery welding piece, the busbar electrode piece, and the second battery welding piece.

9. The battery cell connection assembly according to claim 1, characterized in that, The battery cell connection assembly consists of, from top to bottom, the first battery welding piece, the busbar electrode piece, and the second battery welding piece.

10. The battery cell connection assembly according to claim 9, characterized in that, The first joint is located away from the external end connecting piece, and the second joint is located between the bases of the two battery cell connecting pieces.

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