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Negative-electrode terminal for cell

A negative terminal, battery terminal technology, applied in battery pack parts, battery boxes/jackets, small-sized batteries/battery packs, etc., can solve the problems of decreased bonding strength, easy peeling, etc., and achieve the effect of reducing resistance

Active Publication Date: 2014-07-09
NEOMAX MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, there is a problem that the bonding strength between the Al layer (first metal layer) and the Ni layer (second metal layer) decreases due to the excess intermetallic compound formed at the joint interface, resulting in the Al layer (first metal layer) layer) and Ni layer (second metal layer) become easy to peel off

Method used

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  • Negative-electrode terminal for cell
  • Negative-electrode terminal for cell
  • Negative-electrode terminal for cell

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0054] First, refer to Figure 1 to Figure 7 , the structure of the lithium-ion battery connector 100 according to the first embodiment of the present invention will be described.

[0055] Lithium-ion battery connected body 100 according to the first embodiment of the present invention is a large battery system used in electric vehicles (EV: electric vehicle), hybrid electric vehicles (HEV: hybrid electric vehicle), residential power storage systems, and the like. The lithium-ion battery connector 100, such as figure 1 As shown, a plurality of lithium ion batteries 1 are electrically connected by a plurality of flat bus bars (busbars) 101 . Among them, the lithium ion battery 1 is an example of the "battery" of the present invention, and the bus bar 101 is an example of the "battery terminal connecting plate" of the present invention.

[0056] In addition, in the lithium ion battery connector 100 , a plurality of lithium ion batteries 1 are arranged along the width direction...

Embodiment

[0105] Next, a confirmation experiment of the joint strength of the negative electrode terminal 8 performed in order to confirm the effect of the above-mentioned first embodiment will be described. Specifically, test materials 300 of the following Examples 1 to 4 and Comparative Examples 1 and 2 were prepared as examples corresponding to the first embodiment and comparative examples corresponding to the examples, and joint strength confirmation experiments were performed.

[0106] First, make the Figure 9 The test material 300 is shown. Specifically, an Al material 301 made of Al having a thickness of 2.5 mm and a bonding material 302 having a thickness of 2.0 mm were prepared. Here, in Examples 1 to 4, Ni—Cu alloys containing 2 mass %, 10 mass %, 23 mass %, and 45 mass % of Ni were used as the bonding material 302 . Among them, the Ni—Cu alloy containing 2% by mass of Ni has a solidus temperature of 1088° C. and a resistivity of 0.05 μΩ·m. In addition, the solidus tempera...

no. 2 approach ）

[0119] Next, refer to Figure 5 , Figure 12 with Figure 13 , illustrating the structure of the negative terminal 408 according to the second embodiment of the present invention. In the negative terminal 408 according to the second embodiment, unlike the above-described first embodiment, a case where the terminal connection layer 481 includes a two-layer metal composite (metal composite part) in which a Ni layer 487 and a Cu layer 488 are bonded will be described. Among them, the negative terminal 408 is an example of the "battery negative terminal" of the present invention.

[0120] Such as Figure 12 As shown, the negative terminal 408 according to the second embodiment of the present invention includes a metal composite in which an Al layer 80 made of Al and a terminal connection layer 481 including a two-layer metal composite are bonded by crimping. In addition, the terminal connection layer 481 is embedded in the junction portion 83 with the bus bar (refer to Figur...

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Abstract

A negative-electrode terminal for a cell in which separation between a first metal layer and a second metal layer hardly takes place is provided by suppressing excess formation of an intermetallic compound on a bond interface between the first metal layer and the second metal layer. This negative-electrode terminal for a cell includes a clad portion formed by bonding a first metal layer made of Al or an Al alloy and a second metal layer containing Ni and Cu and consisting of one or a plurality of layers to each other. The first metal layer includes a connected region connected with a cell terminal connecting plate and a stacked region adjacent to the connected region on the side of the same surface, while the second metal layer is bonded to the first metal layer in the stacked region and configured to be connectable to cell negative electrodes of cells.

Description

technical field [0001] The present invention relates to, for example, a battery negative terminal applicable to a lithium ion battery, and particularly relates to a battery negative terminal in which a plurality of members made of different metal materials are joined together. Background technique [0002] Conventionally, there is known a battery terminal in which a plurality of members made of different metal materials are joined to each other, as disclosed in JP 2001-6746 A (Patent Document 1), for example. [0003] In the above-mentioned Patent Document 1, a lithium ion battery is disclosed. The lithium battery includes: a battery can made of Al which functions as a positive electrode; The formed lead (battery terminal connection plate) welded metal clad body (positive terminal); and the negative terminal connected to the negative electrode in a state of being insulated from the above-mentioned battery can. The metal composite of this lithium ion battery is formed by bon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/30H01M2/26H01M2/34H01M50/103H01M50/176H01M50/51H01M50/516H01M50/522H01M50/536H01M50/538H01M50/55H01M50/553H01M50/562H01M50/566
CPCY02E60/12H01M2/263H01M2/305H01M2/06H01M2/024H01M2/30H01M2/206Y02E60/10H01M50/538H01M50/553H01M50/522H01M50/562H01M50/55H01M50/516H01M50/176H01M50/536H01M50/566H01M50/51H01M50/103H01M50/543H01M50/531H01M50/572
Inventor 织田喜光石尾雅昭
Owner NEOMAX MATERIALS