Wound electrode assembly for an electrochemical cell, and methods and devices for manufacture of same

Patent metadata

Field	Value
Publication number	US-11588183-B2
Application number	US-201816228524-A
Country	US
Kind code	B2
Filing date	Dec 20, 2018
Priority date	Mar 28, 2016
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

An electrochemical cell includes a cell housing and an electrode assembly disposed in the cell housing. The electrode assembly includes an electrode pair that is arranged to form a winding having a polygonal spiral wound shape in which a radius of the corner portions of each turn of the winding is constant, regardless of the number of turns. In addition, a length of the linear portions of one turn of the winding is different than a length of the linear portions of another turn of the winding. Since each turn of the winding includes the corner portions having a desired radius, the volumetric efficiency of the electrode assembly including the winding within a cell housing is improved relative to some cells that use conventional windings. An apparatus and method of forming a polygonal spiral wound winding are disclosed.

First claim

What is claimed is:

1. A method of manufacturing an electrode assembly for use in an electrochemical cell, the method comprising
providing a positive electrode, a negative electrode and a separator disposed between the positive electrode and the negative electrode, the positive electrode, the separator and the negative electrode arranged in a layered configuration to form an electrode stack,
winding the electrode stack about a winding axis in a spiral configuration in which an outermost layer of the wound electrode stack is wound first, and an innermost layer of the wound electrode stack is wound last.

2. The method of claim 1 , wherein each layer of the wound electrode stack is formed having corners, and a radius of the corners of the outermost layer is the same as a radius of a layer wound subsequently to the outermost layer.

3. The method of claim 1 , wherein the method includes
winding the electrode stack into a polygonally-shaped winding having the spiral configuration by forming the outermost layer of the polygonally-shaped winding into a polygonal shape when viewed in a cross-section that is transverse to the winding axis.

4. The method of claim 3 , including subsequently arranging additional layers on an inner side of the outermost layer.

5. The method of claim 4 , wherein each additional layer has a polygonal shape when viewed in the cross-section that is transverse to the winding axis.

6. The method of claim 5 , wherein the method includes
providing a second winding having a spiral configuration, and
electrically connecting the second winding to an innermost end of the polygonally shaped winding.

7. The method of claim 1 , wherein the method includes
providing a polygonal frame, and
the step of winding the electrode stack includes overlying the electrode stack along an inner surface of the frame.

8. The method of claim 7 , wherein overlying the electrode stack includes
continuously arranging the electrode stack within the frame such that a layer of the electrode stack is placed upon the inner surface of the frame one side of the frame at a time and upon each side of the sides of the frame in a serial manner, and subsequent layers of the electrode stack are placed upon an inner surface of the layer.

Assignees

• Robert Bosch Battery Systems Llc
• Bosch Gmbh Robert

Inventors

• Botadra Mehul
• Levin Eugene
• Kotik Mark
• Frick Paul

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M10/049

  Processes for forming or storing electrodes in the battery container · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title