Battery core connecting assembly

Abstract

The utility model provides a battery core connecting assembly. The battery core connecting assembly 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] The utility model relates to a battery conductive frame in a battery pack, in particular to a battery core connection assembly. Background Art

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

[0003] The structure of a battery cell mainly includes positive electrode material, electrolyte, negative electrode material, isolation layer and shell. The isolation membrane separates the positive electrode material and the negative electrode material to avoid short circuit, and the electrolyte is arranged in the porous isolation membrane and acts as a conductor of ionic charge. The shell is used to cover the positive electrode material, isolation membrane, electrolyte and negative electrode material mentioned above. Generally speaking, the shell is usually made of metal.

[0004] When in use, a plurality of battery cells are connected in series and / or in parallel through a battery conductive frame to form a battery pack, so that the battery pack can output the voltage required by the product. Generally speaking, the battery conductive frame and the battery cells are connected by electric welding.

[0005] The existing battery conductive frame is a battery welding sheet (TAB) extending from a single welding copper sheet. When there are multiple battery cells, multiple battery welding sheets need to be extended from the resistance welding copper sheet. In this structure with a single welding copper sheet, each set of battery welding sheets will occupy a certain space, which affects the battery configuration density of the battery pack. At the same time, extending multiple sets of battery welding sheets from a single welding copper sheet will also make the manufacturing cost too high. Utility Model Content

[0006] Based on the above technical issues, the utility model proposes a battery core connection assembly for reducing the manufacturing cost and occupied space of a battery conductive mechanism.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a battery core connection assembly, including a busbar electrode sheet, a first battery welding sheet and a second battery welding sheet. The busbar electrode sheet has two battery core connection sheets and an external terminal connection sheet. The two battery core connection sheets extend to the sides of the external terminal connection sheet, and there is a spacing distance between the two battery core connection sheets. The first battery welding sheet has a first joint and two first branches. The two first branches extend in a bifurcated manner to the first joint, and each first branch has a first welding end respectively. The middle sections of the two first branches are respectively combined with each battery core connection sheet. The second battery welding sheet has a second joint and two second branches, the second branches extend in a bifurcated manner to the second joint, and each second branch has a second welding end respectively. The middle sections of the two second branches are respectively combined with each battery core connection sheet.

[0008] Preferably, the two battery core connecting pieces have included angles with the external terminal connecting piece respectively.

[0009] Preferably, the two battery core connecting pieces extend vertically to the sides of the external terminal connecting piece.

[0010] Preferably, in at least one embodiment, a slot is provided 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 disposed on the first combining portion, and a groove is formed on the first combining portion to divide the first welding portion into two parts.

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

[0013] Preferably, a second welding portion is disposed on the second combining portion, and a groove is formed in the second combining portion to divide the second welding portion into two parts.

[0014] Preferably, the busbar electrode sheet has two first positioning holes, which are respectively opened on the two battery core connecting sheets; the first battery welding sheet has two second positioning holes, which are respectively arranged on the two first branches, and the spacing distance between the two second positioning holes is equal to the spacing distance between the two first positioning holes; the second battery welding sheet has two third positioning holes, which are respectively arranged on the two second branches, and the spacing distance between the two third positioning holes is equal to the spacing distance between the two first positioning holes; and the two first positioning holes, the two second positioning holes, and the two third positioning holes overlap with each other to facilitate the positioning between the first battery welding sheet, the busbar electrode sheet and the second battery welding sheet

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

[0016] Preferably, the first joint portion is far away from the external terminal connecting piece, and the second joint portion is located between the bases of the two battery core connecting pieces.

[0017] The present invention separates the electrode sheet connecting multiple battery cells into multiple parts and processes them individually. The structure of each part, that is, the structure of the first battery welding sheet, the busbar electrode sheet, and the second battery welding sheet of the present invention, can be greatly simplified to facilitate rapid production (for example, it can be completed using a single punching), which can effectively reduce costs. In addition, the configuration of the first battery welding sheet, the busbar electrode sheet, and the second battery welding sheet overlapping each other can also effectively reduce the space occupied by the battery cell connection assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded stereogram of a battery core connection assembly according to an embodiment of the utility model.

[0019] Figure 2 It is a three-dimensional diagram of a battery core connection assembly according to an embodiment of the utility model.

[0020] Figure 3 It is another stereoscopic view of the battery core connection assembly according to an embodiment of the utility model.

[0021] Explanation of the reference numerals: 100 - battery cell connection assembly; 110 - first battery welding sheet; 111 - first combining portion; 111a - first welding portion; 111b, 113b, 122b, 124b - slots; 112 - second positioning hole; 113 - first branch; 113a - first welding end; 120 - second battery welding sheet; 122 - second combining portion; 122a - second welding portion; 123 - third positioning hole; 124 - second branch; 124a - second welding end; 130 - bus bar sheet; 131 - first positioning hole; 132 - battery cell connecting sheet; 134 - external terminal connecting sheet; 200 - battery cell. DETAILED DESCRIPTION

[0022] See also Figure 1 as well as Figure 2 , a battery cell connection assembly 100 proposed in an embodiment of the present invention is shown, comprising a busbar 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 metal. Metal with high conductivity and ductility is conducive to rapid processing operations such as stamping, so as to accelerate productivity and reduce processing costs. The busbar sheet 130 has two battery core connecting pieces 132 and an external terminal connecting piece 134. The two battery core connecting pieces 132 extend on the side of the external terminal connecting piece 134, and there is a spacing distance between the two battery core connecting pieces 132. The two battery core connecting pieces 132 respectively have an angle with the external terminal connecting piece 134; preferably, the angle is 90 degrees, that is, the two battery core connecting pieces 132 extend vertically on the side of the external terminal connecting piece 134. In addition, the busbar sheet 130 also has two first positioning holes 131, which are respectively opened on the two battery core connecting pieces 132.

[0024] like Figure 1 As shown, the first battery welding sheet 110 is also made of a metal with high conductivity and ductility, such as copper metal. The first battery welding sheet 110 has a first joint portion 111 and two first branches 113. The two first branches 113 extend in a bifurcated manner 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 to be welded to the end of the battery cell 200. Specifically, a groove 113b can be further provided on the first welding end 113a to divide the first welding end 113a into two parts. At the same time, a convex point 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 end or the negative end of the battery cell 200.

[0025] In addition, a first welding portion 111a is also provided on the first combining portion 111. A slot 111b may be provided on the first combining portion 111 to divide the first welding portion 111a into two parts. Meanwhile, a convex point may 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. In other words, the first battery welding sheet 110 may be welded to at least three battery cells 200.

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

[0027] like Figure 1As shown, the second battery welding sheet 120 is also made of a metal with high conductivity and ductility, such as copper metal. The second battery welding sheet 120 has a second joint portion 122 and two second branches 124. The two second branches 124 extend in a bifurcated manner 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 provided on the second welding end 124a to divide the second welding end 124a into two parts. At the same time, a convex point 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 end or the negative end of the battery cell 200.

[0028] In addition, a second welding portion 122a is also provided on the second combining portion 122. A slot 122b may be provided on the second combining portion 122 to divide the second welding portion 122a into two parts. Meanwhile, a convex point may 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. In other words, the second battery welding sheet 120 may be welded to at least three battery cells 200.

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

[0030] Specifically, the first battery welding sheet 110 and the second battery welding sheet 120 can be completely the same components, and are only arranged in different directions in actual use. In this way, the types of parts of the battery cell connection assembly 100 can be further simplified, which is conducive to reducing costs.

[0031] Figure 2 The figure is a three-dimensional view of the battery cell connection assembly 100. The components of the battery cell connection assembly 100 from top to bottom are respectively a first battery welding sheet 110, a busbar electrode sheet 130 and a second battery welding sheet 120.

[0032] like Figure 2 Specifically, the middle sections of the two first branches 113 are respectively combined with an upper surface of each battery core connection sheet 132, and the first combination portion 111 is configured away from the external terminal connection sheet 134. The middle sections of the two first branches 113 are respectively combined with a lower surface of each battery core connection sheet 132, and the second combination portion 122 is located between the bases of the two battery core connection sheets 132.

[0033] In addition, during the combining process, the first positioning hole 131, the second positioning hole, and the third positioning hole can overlap with each other to facilitate the positioning between the first battery welding sheet 110, the bus electrode sheet 130 and the second battery welding sheet 120, so as to facilitate welding the first battery welding sheet 110, the bus electrode sheet 130 and the second battery welding sheet 120 into one.

[0034] like Figure 2 and Figure 3 As shown, by combining the first battery welding sheet 110, the busbar electrode sheet 130 and the second battery welding sheet 120, the first battery welding sheet 110 and the second battery welding sheet 120 can be welded to at least three battery cells 200, respectively, so that the battery cell connection assembly 100 can connect at least six batteries. The external terminal connection sheet 134 is used to connect to an external circuit to combine the battery cell connection assembly 100 and the corresponding battery cell 200 into a battery module.

[0035] Figure 3 The positive electrode of the battery cell 200 shown is only an example. In practice, the electrode connection method of the battery cell 200 may be determined in accordance with the output and management requirements of the battery cell 200 .

[0036] The present invention separates the electrode sheet connecting multiple battery cells into multiple parts and processes them individually. The structure of each part, that is, the structure of the first battery welding sheet 110, the busbar electrode sheet 130 and the second battery welding sheet 120 of the present invention, can be greatly simplified to facilitate rapid production (for example, it can be completed using a single stamping), which can effectively reduce costs. In addition, by configuring the first battery welding sheet 110, the busbar electrode sheet 130 and the second battery welding sheet 120 to overlap each other, the space occupied by the battery cell connection assembly 100 can also be effectively reduced.

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

Claims

1. A battery cell connection assembly, characterized in that: Included are: A busbar electrode sheet having two battery core connection sheets and an external terminal connection sheet, wherein the two battery core connection sheets extend from the sides of the external terminal connection sheet, and there is a spacing distance between the two battery core connection sheets; A first battery welding sheet, having a first joint portion and two first branches; wherein the two first branches extend in a bifurcated manner from the first joint portion, and each of the first branches has a first welding end; and the middle sections of the two first branches are respectively joined to each of the battery core connecting sheets; The second battery welding sheet has a second connecting portion and two second branches, the two second branches extend in a bifurcated manner from the second connecting portion, and each second branch has a second welding end, and the middle sections of the two second branches are respectively connected to each battery core connecting sheet.

2. The battery cell connection assembly according to claim 1, characterized in that: The two battery core connecting pieces respectively have included angles with the external terminal connecting piece.

3. The battery cell connection assembly according to claim 2, characterized in that: The two battery core connecting pieces extend vertically to the sides of the external terminal connecting piece.

4. The battery cell connection assembly according to claim 1, characterized in that: A slot is formed 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 portion is provided with a first welding portion, and the first joint portion is provided with a groove to divide the first welding portion into two parts.

6. The battery cell connection assembly according to claim 1, characterized in that: A slot is formed 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 portion is provided with a second welding portion, and the second joint portion is provided with a groove to divide the second welding portion into two parts.

8. The battery cell connection assembly according to claim 1, characterized in that: The busbar electrode sheet has two first positioning holes, which are respectively opened on the two battery core connecting sheets; The first battery welding sheet has two second positioning holes, which are respectively arranged on the two first branches, and the spacing distance between the two second positioning holes is equal to the spacing distance between the two first positioning holes; The second battery welding sheet has two third positioning holes, which are respectively arranged on the two second branches, and the spacing distance between the two third positioning holes is equal to the spacing distance between the two first positioning holes; and The two first positioning holes, the two second positioning holes, and the two third positioning holes overlap with each other to facilitate the positioning of the first battery welding sheet, the busbar electrode sheet, and the second battery welding sheet.

9. The battery cell connection assembly according to claim 1, characterized in that: The battery core connection assembly is composed of the first battery welding sheet, the busbar electrode sheet and the second battery welding sheet from top to bottom.

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

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