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In addition, when cutting, burrs may be generated on the ends of the lead wires in the width direction, and the bends and burrs may damage the resin layer inside the package, reach the metal film, cause short circuit and leakage conduction, and cause thermal compression bonding. When there is no resin layer filled in the space inside the curved surface
The inventors of the present application have found that these are the reasons. Therefore, in many cases, there is a problem that the internal liquid and gas leak, lead wire short circuit, etc. after a period of time, so that a high-quality electrochemical device cannot be obtained.
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Embodiment 1
[0112] In Example 1, under the same conditions as in Comparative Example 1, the portion to be thermocompression-bonded was subjected to press working as described above. In this stamping process, the thermocompression bonding of the Al package (3.0kgf / cm 2 )(2.94×10 5 Pa) Higher pressure (4.0kgf / cm 2 )(3.92×10 5 Pa), carry out stamping treatment on the range of predetermined thermocompression bonding. As a result, the thickness of the Al lead after the planarization process was reduced to 80 μm. The ratio α=Z1 / Z2=80 μm / 166 μm=48%. In addition, curvature R=0.14% (=5μm / 3.5mm), area S1=0.009mm 2 .
[0113] Next, thermocompression bonding of the lead sealing portion was performed in the same manner as in Comparative Example 1. When measuring yield β1, no electrolyte solution was injected into the package. When measuring the pass rate β2, inject electrolyte. In Example 1, all the conditions were the same as those of Comparative Example 1 except for the lead wire punching. ...
Embodiment 2
[0159] (Example 2) Case of ratio α=50%
[0160] All the conditions were the same as in Example 1 except that the thickness Z1 of the Al lead was 90 μm (punching completed) and Z2=180 μm (90 μm×2). In this case, α=50%. Curvature R=0.14% (=5μm / 3.5mm)% (area S1=0.009mm 2 ). The depth of the bent portion is 5 μm. As a result, the pass rate β1 of the empty cell before the electrolyte solution was inserted was 80%, and the effect of lead punching (deburring) appeared, but it was lower than the pass rate (90%) of Example 1. The reason for this is considered to be that since the resin layer is thinner than the thickness of the lead wires, the lead wires cannot be sufficiently covered and a short circuit occurs. Also, the pass rate β2 related to liquid leakage after electrolyte solution injection was 90%.
[0161] That is, the following results are obtained.
[0162] Z1=90μm
[0163] Z2=180μm
[0164] α=50%
[0165]R=0.14% (=5μm / 3.5mm)
[0166] S=0.009mm 2
[0167] Pass rat...
Embodiment 3
[0241] (Example 3) Case of ratio α=56%
[0242] All the conditions were the same as in Example 1 except that the thickness Z1 of the Al lead was 90 μm (punching completed) and Z2=160 μm (80 μm×2). In this case, α=56%, and the following results are obtained.
[0243] Z1=90μm
[0244] Z2=160μm
[0245] α = 56%
[0246] R=0.14% (=5μm / 3.5mm)
[0247] S=0.009mm 2
[0248] Pass rate β1=82%
[0249] Pass rate β2 = 75%
[0250] Final pass rate β=61.5%
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Abstract
The invention relates to an electro-chemical device and a method for manufacturing the same. The electro-chemical device comprises a package including a metal film, a battery element sealed within the package, resin layers disposed at least on the inside of a seal part of the package, and a lead extending from the battery element to the outside of the package through between the resin layers at the seal part of the package. The lead has a special form into which the resin of the resin layers bites, so that the lead is firmly buried in the resin layers, whereby the lead is fully inhibited frommoving. Therefore, an electro-chemical device having a high quality can be obtained.
Description
technical field [0001] The present invention relates to an electrochemical device and a method of manufacturing the same. Background technique [0002] In conventional electrochemical devices, battery elements such as lithium ion batteries (LIBs) and electric double layer capacitors (EDLCs) are sealed in packages made of aluminum. That is, a battery body is placed in a package made of aluminum laminates, an electrolyte solution is introduced into the package as necessary, and the periphery of the package is sealed. [0003] The lead wires of the anode and the cathode extend from the battery body, and extend to the outside through gaps in the sealing portion of the package respectively. In addition, a resin layer is provided inside the aluminum laminate, and the seal is sealed by thermocompression bonding. Regarding the structure between the sealing portion and the leads, some studies have been made. Patent Document 1 (Japanese Unexamined Patent Application Publication No....
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