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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of poor safety and sealing performance of lithium-ion secondary batteries, achieve effective use of internal space and improve safety performance, the effect of improving sensitivity

Active Publication Date: 2012-07-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem of poor safety performance and sealing performance of lithium-ion secondary batteries existing in the prior art

Method used

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Embodiment Construction

[0013] The invention provides a lithium ion secondary battery, such as figure 1 As shown, it includes a casing 2, a cap assembly 3 for insulating and sealing the casing, and a cell 1 and electrolyte located in a cavity surrounded by the casing and the cap assembly; the cell 1 has a first tab and a second pole Ears, wherein the first tab is electrically connected to the housing 2, and the second tab is electrically connected to the cap assembly 3.

[0014] In the present invention, there is no special limitation on the positive and negative polarities of the first tab and the second tab, that is, there is no special limitation on the electrical connection between the housing 2 and the positive pole or the electrical connection between the housing 2 and the negative pole. For example, the first tab may be a positive pole, and the second tab may be a negative pole; or the first tab may be a negative pole, and the second tab may be a positive pole. Usually, the first tab is a ne...

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Abstract

The invention provides a lithium-ion secondary battery which comprises a shell, a cap component used for sealing the shell in an insulating way, and a battery cell and electrolyte that are arranged in a cavity defined by the shell and the cap component, wherein a first pole ear and a second pole ear are led out from the battery cell; the first pole ear is electrically connected with the shell, and the second pole ear is electrically connected with the cap component; the cap component comprises an electric connection component and a sealing ring arranged at the outer side of the electric connection component; the electric connection component comprises a positive temperature coefficient (PTC) thermistor protector, an anti-explosion piece and an upper cap which are sequentially and electrically connected; the PTC thermistor protector is positioned between the second pole ear and the anti-explosion piece; the lower surface of the PTC thermistor protector is electrically connected with the second pole ear, the central part of the upper surface of the PTC thermistor protector is electrically connected with the lower concave part in the centre of the anti-explosion piece, and the edge around the upper surface of the PTC thermistor protector is provided with an insulating washer so as to be insulated with the edge around the anti-explosion piece; and PTC thermistor protector is provided with a vent hole. The lithium-ion secondary battery has higher safety performance and sealing performance, the internal structure of the battery is simplified, and the internal space of the battery is effectively utilized.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries, as a green energy source, have developed rapidly in the past ten years. With the improvement of performance and the reduction of cost, they have shown more and more vitality. Compared with Ni-MH, Ni-Cd and lead-acid batteries have the advantages of higher working voltage, high energy density, long cycle life, small memory effect, low self-discharge rate, lightness, convenience, and environmental protection. They are used as portable power sources in mobile phones, notebooks, and digital electronics. Products and other small power drive equipment have been widely used, and have shown obvious competitive advantages in the future high specific energy and high power energy storage battery market. However, due to safety and sealing problems, the application fields of lithium-ion secondary batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/04H01M2/12H01M2/34H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 吴强
Owner BYD CO LTD
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