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Lithium ion secondary battery

A secondary battery, lithium ion technology, applied in the direction of secondary battery, lithium storage battery, secondary battery gas removal, etc., can solve the problems of increased battery tightening force, uneven battery thickness, etc. The effect of rising, solving the uneven thickness of the battery, and easy application

Inactive Publication Date: 2016-01-13
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Uneven battery thickness due to battery expansion and increase in battery fastening force have also become a major problem when manufacturing modules that use many batteries for automotive applications.

Method used

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  • Lithium ion secondary battery
  • Lithium ion secondary battery
  • Lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]

[0053] Lithium transition metal composite oxide as the positive electrode active material, flaky graphite as the conductive aid, and polyvinylidene fluoride (PVDF) as the binder are mixed at a weight ratio of 85:10:5, and added as a dispersion The solvent N-methylpyrrolidone (NMP) and mixed slurry was coated on both surfaces of the aluminum film with a thickness of 20 μm. Afterwards, after drying, pressing, and slitting, the coating part width is 80mm and the coating amount is 130g / m2. 2 1. A positive electrode 1 with an electrode length of 4 m. In addition, an uncoated portion 1a formed continuously was arranged at one end portion in the longitudinal direction of the aluminum foil, and this portion was used as a positive electrode lead.

[0054]

[0055] Graphite-based carbon powder as a negative electrode active material and PVDF as a binder were added, and NMP as a dispersion solvent was added and kneaded. The slurry was coated on both surfaces of a copper foi...

Embodiment 2

[0064] The lithium ion secondary battery 22 of Example 2 has the same structure as the lithium ion secondary battery 22 described in Example 1, and only the insulating member containing the clathrate inside the battery is different. Therefore, only the above-mentioned insulating member will be described.

[0065]

[0066]The aforementioned clathrate was contained in a weight ratio of 50% by weight in the polypropylene shaft chip 13 disposed at the center of the wound electrode group 21 . The gas generated in the battery is absorbed by the clathrate contained here. For the insulating synthetic resin material constituting the shaft core piece 13, other materials than the aforementioned polypropylene may be used.

[0067] Other than that, the lithium ion secondary battery 22 was fabricated in the same manner as in Example 1.

Embodiment 3

[0069] The lithium ion secondary battery 22 of Example 3 has the same structure as the lithium ion secondary battery 22 described in Example 1, and only the insulating member containing the clathrate inside the battery is different. Therefore, only the above-mentioned insulating member will be described.

[0070]

[0071] The battery cover 9 provided with the liquid injection hole 10 is pre-connected with the negative external terminal 7 and the positive external terminal 8, and is made so that the negative external terminal 7 is electrically connected to the negative collector plate 5, and the positive external terminal 8 is connected to the positive collector plate. 6 is also electrically conductive. The positive electrode uncoated portion 1 a was joined to the positive electrode current collector plate 6 by ultrasonic welding, and the negative electrode uncoated portion 2 a was joined to the negative electrode current collector plate 5 in the same manner. After that, the...

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Abstract

The objective of the present invention is to provide a highly reliable lithium ion secondary battery which is suppressed in increase of the pressure within the battery caused by gas generation for the purpose of suppressing swelling of the battery and enables the production of a battery module for in-vehicle use without any difficulty, said swelling being caused by the increase of the pressure within the battery and leading to variation of the battery thickness and increase of the fastening force of the battery. A lithium ion secondary battery (22) according to the present invention is characterized by containing a clathrate compound in a battery can (11), said clathrate compound being one or more compounds selected from among cyclodextrins, calixarenes and crown ethers. Due to this configuration, the CO gas, CO2 gas and H2 gas within the battery can (11) are absorbed and swelling of the battery due to the gases is suppressed.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery mounted on a vehicle or the like. Background technique [0002] Lithium-ion secondary batteries are recently used in portable devices such as digital video cameras, notebook personal computers, and mobile phones because of their high energy density compared with other secondary batteries. In addition, in recent years, in order to cope with environmental problems, research and development of large-scale lithium-ion secondary batteries for electric vehicles or power storage are also being actively carried out. Especially in the automobile industry, the development of electric vehicles using electric motors as a power source and hybrid electric vehicles using both internal combustion engines and electric motors is progressing, and some of them have been put into practical use. [0003] Lithium-ion secondary batteries have the advantage of high energy density, especially for large-scale lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/02H01M10/052H01M10/0566H01M50/121H01M50/124H01M50/14
CPCH01M10/0525H01M2220/20H01M10/52H01M10/4235Y02E60/10Y02P70/50H01M50/1243H01M50/121H01M50/14H01M50/124H01M10/0587
Inventor 有岛康夫
Owner HITACHI AUTOMOTIVE SYST LTD