T-shaped connecting piece

Abstract

The utility model discloses a T-shaped connecting piece. The T-shaped connecting piece comprises a horizontal connecting piece and a vertical connecting piece, the horizontal connecting piece and the vertical connecting piece are arranged vertically, and the horizontal connecting piece is used for being electrically connected with a battery cover plate; the vertical connecting piece is used for being electrically connected with two adjacent battery core wrapping tabs, and the battery core wrapping tabs are distributed on the two sides of the vertical connecting piece. The T-shaped connecting piece disclosed by the utility model can effectively reduce the requirement on the height of the tabs, release more internal space of the battery to a core package area, meet the design of a battery with higher energy density, and simultaneously, the tabs of a plurality of core packages can be welded at one time in an ultrasonic welding process, so that unnecessary repeated work is reduced, and the production efficiency is improved. In addition, the two core packages can be directly combined in the ultrasonic welding process, and the influence of transportation and manual carrying on the welding area in the period can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery connecting pieces, in particular to a T-shaped connecting piece. Background Art

[0002] With the continuous development of green and clean energy technology, lithium-ion battery technology has also developed rapidly. In order to meet various market demands, the battery structure of lithium-ion batteries is also being continuously optimized. Among them, the connecting piece is a connecting device set between the battery cover and the battery core pack. In actual production, the two are welded together through laser welding technology to play a role in diversion.

[0003] The connecting piece structure currently used is a planar structure, that is, different areas are divided on a plane. Ultrasonic welding is used to connect the connecting piece to the battery core pack in some areas, and laser welding is used to connect the connecting piece to the battery cover in some areas, so as to realize the connection between the battery cover and the battery core pack. In addition, the ultrasonic welding process mentioned above requires each core pack (a battery usually contains 2 core packs or 4 core packs) to be welded to the connecting piece separately, which involves a lot of repetitive work. And the battery cell needs to be ultrasonically welded and laser welded before the core closure process can be carried out (core closure means overlapping and stacking two core packs). During this period, the two core packs are in a separated and flat state, and transportation and manual handling are prone to tearing the pole ears, affecting the subsequent current conduction. On the other hand, the traditional planar connecting piece has high requirements for the height of the pole ears. If the height of the pole ears is too low, it is easy to cause some pole ears to be unable to be fully welded, affecting the current conduction and welding effect. However, the increase in the height of the pole ears will occupy more space above the battery, limit the design of the battery cell, compress the space of the core pack area, affect the energy density of the battery, and have certain defects. Utility Model Content

[0004] The utility model aims to provide a T-shaped connecting piece to reduce the height of the pole lug, increase the energy density of the battery, and improve the welding quality.

[0005] In order to solve the above technical problems, the utility model provides a T-shaped connecting piece, including a horizontal connecting piece and a vertical connecting piece;

[0006] The horizontal connecting piece is arranged perpendicular to the vertical connecting piece, and the horizontal connecting piece is used to be electrically connected to the battery cover plate;

[0007] The vertical connecting piece is used for electrical connection between two adjacent battery cell tabs, and the battery cell tabs are distributed on both sides of the vertical connecting piece.

[0008] Furthermore, a welding area is provided on the surface of the horizontal connecting piece, and the welding area is used for electrical connection between the horizontal connecting piece and the battery cover plate.

[0009] Furthermore, the surface of the welding area is lower than the surface of the horizontal connecting piece.

[0010] Furthermore, the welding area is provided with embossing, and the embossing is a concave-convex structure.

[0011] Furthermore, the width of the horizontal connecting piece is greater than the width of the two battery cell tabs.

[0012] Furthermore, the horizontal connecting piece and the vertical connecting piece are integrally formed.

[0013] Furthermore, the horizontal connecting piece and the vertical connecting piece are both made of copper material.

[0014] Furthermore, the horizontal connecting piece and the vertical connecting piece are both made of aluminum.

[0015] Furthermore, the length of the vertical connecting piece is not less than the length of the battery cell package tab.

[0016] Furthermore, a single side of the vertical connecting piece is connected to at most one battery cell package tab.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] The T-shaped connecting piece of the utility model can effectively reduce the requirement for the height of the pole ear, release more internal space of the battery for the core package area, meet the design of higher energy density batteries, and at the same time, the pole ears of multiple core packages can be welded at one time in the ultrasonic welding process, reducing unnecessary repetitive work and effectively improving manufacturing efficiency. In addition, the two core packages can be directly combined in the ultrasonic welding process, which can effectively reduce the impact of transportation and manual handling on the welding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the T-shaped connecting piece of the utility model;

[0020] Figure 2 This is a schematic diagram of the horizontal connecting piece structure of the T-shaped connecting piece of the utility model;

[0021] Figure 3 It is a schematic diagram of the connection structure of the T-shaped connecting piece of the utility model in the core-closed state. DETAILED DESCRIPTION

[0022] The T-shaped connector of the present invention will be described in more detail below in conjunction with the schematic diagram, wherein the preferred embodiment of the present invention is shown. It should be understood that those skilled in the art can modify the present invention described herein and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation to the present invention.

[0023] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] like Figure 1 As shown, an embodiment of the utility model provides a T-shaped connecting piece, including a horizontal connecting piece 1 and a vertical connecting piece 2.

[0025] Specifically, the horizontal connecting piece 1 is vertically arranged with respect to the vertical connecting piece 2, and the horizontal connecting piece 1 is used for electrically connecting with the battery cover.

[0026] The vertical connecting piece 2 is used for electrical connection between two adjacent battery cell tabs 4 , and the battery cell tabs 4 are distributed on both sides of the vertical connecting piece 2 .

[0027] In this embodiment, if Figure 3 As shown, when welding of the cell package tabs 4 and the battery cover is required, two adjacent cell package tabs 4 are attached to the vertical connecting piece 2, and the top of the cell package tabs 4 is attached to the horizontal connecting plate. At this time, the two cell package tabs 4 are tightly attached to the T-shaped connecting piece and arranged neatly, and then the cell package tabs 4 are laser welded to the vertical connecting plate. Since the T-shaped connecting piece is attached to the top and side surfaces of the cell package tabs 4, the volume of the cell package is greatly reduced when the cell is closed, thereby improving the energy density of the battery.

[0028] In addition, during the connection process between the vertical connecting piece 2 and the battery pack tab 4, when the T-shaped connecting piece is placed between the two battery packs, the two battery pack tabs 4 can be welded to the vertical connecting piece 2 at the same time, thereby improving the welding efficiency between the vertical connecting piece 2 and the battery pack tab 4. At the same time, there is no need to weld one of the battery pack tabs 4 and then move the other battery pack tab 4 for welding as in the prior art.

[0029] In order to ensure the reliability and electrical conductivity of the connection between the horizontal connecting piece 1 and the vertical connecting piece 2, the horizontal connecting piece 1 and the vertical connecting piece 2 are integrally formed.

[0030] Furthermore, a welding area 3 is provided on the surface of the horizontal connecting piece 1, and the welding area 3 is used for electrical connection between the horizontal connecting piece 1 and the battery cover plate.

[0031] Specifically, the surface of the welding area 3 is lower than the surface of the horizontal connecting piece 1 , and the welding area 3 is provided with embossing, and the embossing is a concave-convex structure.

[0032] In this embodiment, the welding area 3 is circular, and its surface is slightly lower than the upper surface of the horizontal connecting piece 1. This arrangement is conducive to ensuring good contact between the horizontal connecting piece 1 and the battery cover, thereby achieving good current conduction.

[0033] In addition, the surface of the welding area 3 also has an embossing arrangement, and the embossing is a concave-convex structure, which is used to reduce the reflection phenomenon during laser welding and improve the welding yield, thereby improving the overall yield of the battery.

[0034] Furthermore, the width of the horizontal connecting piece 1 is greater than the width of the two battery cell tabs 4 .

[0035] Specifically, the width of the horizontal connecting piece 1 is greater than the width of the two battery cell tabs 4, so that the top surface of the two battery cell tabs can be completely in contact with the horizontal connecting piece 1, thereby increasing the contact area between the battery cell tabs 4 and the horizontal connecting piece 1, thereby effectively ensuring the current conduction efficiency.

[0036] Similarly, the length of the vertical connecting piece 2 is not less than the length of the battery cell package tab 4. When the vertical connecting piece 2 is connected to the battery cell package tab 4, the length of the vertical connecting piece 2 is not less than the length of the battery cell package tab 4, which can make the vertical connecting piece 2 and the battery cell package tab 4 have a larger contact area, thereby ensuring the current conduction efficiency between the vertical connecting piece 2 and the battery cell package tab 4.

[0037] In addition, when the vertical connecting plate is connected to the cell package tab 4, at most one cell package tab 4 is connected to one side of the vertical connecting sheet 2. That is, one cell package tab 4 can be connected to both sides of the vertical connecting sheet 2, or only one side of the vertical connecting sheet 2 is connected to one cell package tab 4. The number of connections between the vertical connecting sheet 2 and the cell package tab 4 is determined according to the number of cell packages connected.

[0038] Furthermore, the horizontal connecting piece 1 and the vertical connecting piece 2 are both made of copper or aluminum.

[0039] Specifically, the material of the T-type connector is determined according to the positive and negative electrodes of the battery cell tabs. When connected to the positive electrode of the battery cell tab, the T-type connector is made of aluminum. When connected to the negative electrode of the battery cell tab, the T-type connector is made of copper. The specific reasons are as follows:

[0040] First, copper and aluminum are relatively stable in the air. Aluminum easily reacts chemically with oxygen in the air, forming a dense oxide film on the surface of aluminum to prevent further reaction of aluminum. Copper itself is relatively stable in the air and basically does not react in dry air.

[0041] Second, the positive and negative electrode potentials determine that the positive electrode uses aluminum material and the negative electrode uses copper material, rather than the other way around. The positive electrode potential is high, and copper material is easily oxidized under high potential. The oxidation potential of copper material is high, and the surface of copper material has a dense oxide film, which also has a good protective effect on the internal aluminum.

[0042] Compared with the prior art, the utility model has at least the following beneficial effects:

[0043] The T-shaped connecting piece of the utility model can effectively reduce the requirement for the height of the pole ear, release more internal space of the battery for the core package area, meet the design of higher energy density batteries, and at the same time, the pole ears of multiple core packages can be welded at one time in the ultrasonic welding process, reducing unnecessary repetitive work and effectively improving manufacturing efficiency. In addition, the two core packages can be directly combined in the ultrasonic welding process, which can effectively reduce the impact of transportation and manual handling on the welding area.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A T-shaped connecting piece, characterized in that: It includes a horizontal connecting piece and a vertical connecting piece; The horizontal connecting piece is arranged perpendicular to the vertical connecting piece, and the horizontal connecting piece is used to be electrically connected to the battery cover plate; The vertical connecting piece is used for electrical connection between two adjacent battery cell tabs, and the battery cell tabs are distributed on both sides of the vertical connecting piece.

2. The T-shaped connecting piece according to claim 1, characterized in that: A welding area is provided on the surface of the horizontal connecting piece, and the welding area is used for electrical connection between the horizontal connecting piece and the battery cover plate.

3. The T-shaped connecting piece according to claim 2, characterized in that: The surface of the welding area is lower than the surface of the horizontal connecting piece.

4. The T-shaped connecting piece according to claim 2, characterized in that: The welding area is provided with embossing, and the embossing is a concave-convex structure.

5. The T-shaped connecting piece according to claim 1, characterized in that: The width of the horizontal connecting piece is greater than the width of the two battery core tabs.

6. The T-shaped connecting piece according to claim 1, characterized in that: The horizontal connecting piece and the vertical connecting piece are formed in one piece.

7. The T-shaped connecting piece according to claim 1, characterized in that: The horizontal connecting piece and the vertical connecting piece are both made of copper material.

8. The T-shaped connecting piece according to claim 1, characterized in that: The horizontal connecting piece and the vertical connecting piece are both made of aluminum.

9. The T-shaped connecting piece according to claim 1, characterized in that: The length of the vertical connecting piece is not less than the length of the battery core package tab.

10. The T-shaped connecting piece according to claim 1, characterized in that: The vertical connecting piece is connected to at most one battery cell tab on one side.

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