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Electric energy storage device

A technology for power storage devices and outer packaging, applied to batteries, circuits, electrical components, etc., can solve problems such as rising internal pressure of outer packaging materials, achieve the effect of preventing rupture and improving the conduction state

Inactive Publication Date: 2016-11-09
SHOWA DENKO PACKAGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in lithium-ion secondary batteries, etc., there is a situation in which gas is easily generated in the battery main body during overcharging or overheating, so that the gas gradually accumulates in the internal space covered by the exterior material, causing the internal pressure rise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Coating a chemical conversion treatment liquid containing polyacrylic acid, phosphoric acid, chromium and fluorine compounds on both sides of an aluminum foil with a thickness of 40 μm, and drying at 150°C so that the amount of chromium deposited is 3 mg / m 2 .

[0095] One side of the aluminum foil (metal foil layer) after the chemical conversion treatment is coated with a polyester-urethane adhesive. At the time of this application|coating, the part of the edge part of one surface of the aluminum foil was formed as the adhesive agent non-application area by masking process (attaching a masking tape). Then, a biaxially stretched polyamide film (heat-resistant resin layer) having a thickness of 25 μm was pasted on the polyester-urethane adhesive-coated surface. Next, an acid-modified polypropylene-based adhesive was applied to the other surface of the aluminum foil. At the time of this application|coating, the center part of the other surface of the aluminum foil was f...

Embodiment 2

[0099] Prepare two outer packages that are the same as those prepared in Example 1, use these two outer packages, and adopt the method and structure that have been described before to make Figure 4 , 5 The battery of the structure shown. As the electrolyte, the same electrolyte as in Example 1 was used. It should be noted that the angle α formed by the bottom surface and the side surface of the depressed portion 71 was set to 150°, and the depth of the depressed portion 71 was set to 1 mm. In addition, the heat-seal bonding of the heat-sealable resin layers at the peripheral edge portions of the two outer packages was performed in an atmosphere of 1 KPa lower than the atmospheric pressure.

[0100] In the batteries of Examples 1 and 2 obtained by the above-mentioned treatment, the crack prevention properties of the outer casings were evaluated by the following evaluation method.

[0101]

[0102] The internal pressure of each battery was gradually increased by promoting ...

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Abstract

The invention provides an electric energy storage device which is provided with a device body (60) and two external packaging members for accommodating the device body. Each external packaging member (50) is provided with metal foil layers (2,12) and hot-melt resin layers (4,14) which are laminated on one surface of the metal foil layer. One surface of the metal foil layer is partially provided with conductive parts (54,56) which are not covered by the hot-melt resin layer. The anode (61) of the device body is electrically connected with the conductive part (56) of one external packaging member. The cathode (62) of the device body is electrically connected with the conductive part (54) of the other external packaging member. At least one electrode (62) in the anode and the cathode is electrically connected through a state of contacting with the conductive part (54). On the condition that an internal pressure increases, the conductive part (54) in the contacting state is separated from the anode (62), thereby realizing switching off conduction.

Description

technical field [0001] The present invention relates to a power storage device used as a battery for mobile devices, a battery for vehicles, a battery for regenerative energy recovery, a capacitor (capacitor), and the like. [0002] It should be noted that in this specification and claims, the term "contact" means that the internal pressure rises due to the accumulation of gas generated in the power storage device (battery, etc.) When the packaging body bulges outward, the conductive part and the electrode that are electrically connected are in a separable state. Therefore, the term "contact" includes, for example, "adhesive state" and the like, but does not include joints formed by adhesives, Bonding such as bonding by ultrasonic waves. Background technique [0003] Lithium-ion secondary batteries are widely used as power sources of, for example, notebook computers, video recorders, mobile phones, electric vehicles, and the like. This lithium ion secondary battery has a s...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M2/34
CPCH01M50/10H01M50/116H01M50/124H01M50/578Y02E60/10H01M10/4235H01M10/0525H01M2200/20H01M50/531H01M50/543H01M50/572H01M50/121H01M50/119
Inventor 南谷广治
Owner SHOWA DENKO PACKAGING CO LTD
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