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Button cells with wound electrodes with thermal safety

A button battery and safety device technology, which is applied in the direction of batteries, secondary batteries, battery pack components, etc., can solve problems such as explosive combustion, unstable structure of lithium cobalt oxide, and severe heating of batteries

Active Publication Date: 2016-03-09
VARTA MICROBATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the lithium cobalt oxide structure becomes increasingly destabilized by the continued release of lithium until it finally collapses due to the release of oxidant (oxygen)
These processes can lead to intense heating of the battery which can lead to explosive combustion

Method used

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  • Button cells with wound electrodes with thermal safety
  • Button cells with wound electrodes with thermal safety

Examples

Experimental program
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Embodiment Construction

[0070] exist figure 1 The case 101 for a coin cell (B) without crimping is shown in and for comparison the case for a coin cell (A) with a crimped cup edge is shown. The casing of the traditional button battery and the button battery without crimping are composed of a battery cup 102 and a battery cover 103 respectively. They are each connected to each other via a seal 104 . However, while the open edge of the battery cup 102 is crimped inwardly over the edge of the battery cover 103 in the case of a conventional button cell, this is not the case in the case 101 of a button cell without crimping.

[0071] It can be clearly seen that in the case of the button cell housing 101 without beading, the cover regions 102 b and 103 b of the battery cover 103 and the battery cup 102 overlap, whereby an overlapping region 105 results. The inner radius of the cell cup 102 in the overlapping region 105 is substantially constant up to the cut edge 102d. The housing 101 of the uncrimped b...

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Abstract

The invention describes a button cell with a casing consisting of two metal casing halves, an electrode separator complex in the casing, preferably in the form of a helical winding, and a metal shunt that will combine The electrodes of the body are electrically connected to the housing halves, wherein at least one of the shunts is equipped with a thermal safety device.

Description

technical field [0001] The invention relates to a button cell having a casing consisting of two metal casing halves, which contains a wound electrode separator assembly. Background technique [0002] Button cells generally have a housing made up of two housing halves, a battery cup and a battery cover. They can be produced, for example, from nickel-plated deep-drawn metal sheets as stamped and drawn components. Typically, the battery cup is polarized positive and the battery cover is polarized negative. Very different electrochemical systems can be contained in the housing, for example zinc / manganese dioxide, primary and secondary lithium systems or secondary systems such as nickel / cadmium or nickel / metal hydride. [0003] The liquid-tight closure of the button cell is conventionally performed by crimping the edge of the battery cup over the edge of the battery cover in combination with a plastic ring which is arranged between the battery cup and the battery cover and whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M2/34H01M6/50H01M50/109H01M50/119H01M50/159H01M50/188H01M50/198H01M50/528
CPCH01M6/50H01M10/42H01M50/109H01M50/198H01M50/188H01M50/119H01M50/159H01M10/0525H01M2200/10Y02E60/10H01M50/545H01M50/528H01M50/581H01M2200/00H01M2200/103H01M2200/106H01M10/425
Inventor E.皮特利克W.高格勒
Owner VARTA MICROBATTERY