Lithium reservoir system and method for rechargeable lithium ion batteries

A lithium-ion battery and electronic circuit technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery charging/discharging, etc., can solve the problems of reducing the uniformity of current distribution, reducing the battery rate capacity, etc., to achieve the goal of increasing life Effect

CN101517792AInactive Publication Date: 2009-08-26ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-08-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

A lithium-ion battery cell includes at least two working electrodes, each including an active material, an inert material, an electrolyte and a current collector, a first separator region arranged between the at least two working electrodes to separate the at least two working electrodes so that none of the working electrodes are electronically connected within the cell, an auxiliary electrode including a lithium reservoir, and a second separator region arranged between the auxiliary electrode and the at least two working electrodes to separate the auxiliary electrode from the working electrodes so that none of the working electrodes is electronically connected to the auxiliary electrode within the cell.
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Description

[0001] Cross References to Related Applications

[0002] This application is a continuation-in-part of US Patent Application No. 11 / 477404, filed June 28, 2006, which is expressly incorporated herein by reference in its entirety. technical field

[0003] The present invention relates to a method and system for replenishing lithium-ion battery capacity lost due to side reactions during the service life of the battery and storing excess capacity. Background technique

[0004] Over the life of a Li-ion battery, its capacity decreases due to side reactions that lose active material and / or deplete charge. Efforts have been made to reduce the loss of capacity by discovering improved materials.

[0005] Due to their high energy density and high rate capability, rechargeable lithium-ion batteries may be attractive energy storage systems for portable electronic devices and hybrid electric vehicles. However, such batteries may degrade, which may limit their useful life. Specificall...

Examples

Embodiment Construction

[0042] figure 1 A "conventional" Li-ion cell 100 is shown comprising a negative electrode 101 , a positive electrode 102 and a separator region 103 between the negative electrode 101 and the positive electrode 102 . Both the negative electrode 101 and the positive electrode 102 include an active material 104 that can intercalate lithium, an inert material 105 , an electrolyte 106 and a current collector 107 . Separator region 103 includes an electrolyte with lithium cations, acting as a physical separator between negative electrode 101 and positive electrode 102 so that the electrodes do not electrically connect within cell 100 .

[0043] During charging, electrons are generated at the positive electrode 102 and an equal amount of electrons are consumed at the negative electrode 101 . Electrons are transferred via an external circuit. Under ideal working conditions of the battery 100, electrons are generated at the positive electrode 102 because lithium ions are extracted fr...