Galvanic Element

A primary battery and electrode technology, applied in the field of primary batteries, can solve problems such as lithium deposition and battery safety damage

Inactive Publication Date: 2015-09-02
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An inhomogeneous ionic current is disadvantageous because localized overcharging of the electrodes occurs in regions of increased ionic current density
This is particularly problematic in the case of lithium-ion cells, as this can lead to deposition of lithium in areas of increased ion current density, which compromises the safety of the battery pack

Method used

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Embodiment Construction

[0044] figure 1 Denotes a primary cell 1 according to the prior art. Galvanic cell 1 comprises a layer sequence with positive electrode 8 , separator 2 and negative electrode 10 . The positive electrode 8 is connected by its active face 9 to the separator 2 and the negative electrode 10 is also connected by its active face 11 to the separator 2 .

[0045] The positive electrode 8 comprises, for example, an aluminum film as a support, on which an active material based on a combination of different lithium metal oxides is applied. Negative electrode 10 is, for example, a copper foil on which an active material based on natural and / or synthetic graphite is applied.

[0046] The material of the separator 2 is, for example, polyolefin and has many micropores through which electrolyte can penetrate into the separator 2 . The electrolyte is, for example, a lithium conducting salt dissolved in an organic solvent, such as lithium hexafluorophosphate (LiPF 6 ). Separator 2 is itsel...

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Abstract

The invention relates to a galvanic element (1) comprising a positive electrode (8), a negative electrode (10) and a separator (2) which is impregnated with an electrolyte, and between the positive electrode (8) and the negative electrode (10) is arranged, the separator (2) having a porous region (4) which is substantially congruent with the active surfaces (9, 11) of the positive electrode (8) and the negative electrode (10), so that the current paths (12 ) between the positive electrode (8) and the negative electrode (10) through the electrolyte only in a congruent region (14) can extend. Furthermore, the invention relates to a method for manufacturing a galvanic element (1) and a battery comprising an electrochemical element (1).

Description

technical field [0001] The present invention relates to a galvanic cell comprising a positive electrode, a negative electrode and a separator which is impregnated with an electrolyte and arranged between the positive electrode and the negative electrode. Furthermore, the invention relates to a battery comprising such a galvanic cell and a method for producing such a galvanic cell. Background technique [0002] Lithium-ion batteries are characterized in particular by a very high specific energy and an extremely low self-discharge. The lithium-ion individual cells of such a battery have at least one positive electrode and at least one negative electrode (cathode or anode), which can reversibly store (intercalate) or redistribute (intercalate) lithium ions. Furthermore, the lithium-ion cell comprises at least one separator, which separates the positive electrode and the negative electrode from each other both spatially and electrically. Lithium ion conductors are required for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M10/0525H01M50/40H01M50/414H01M50/463
CPCH01M10/0525H01M10/058H01M50/463H01M50/414H01M10/0463H01M10/0585Y02E60/10
Inventor P·拉费尔斯泰特
Owner ROBERT BOSCH GMBH
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