Electrochemical energy storage cell

Patent metadata

Field	Value
Publication number	US-12525636-B2
Application number	US-202117386643-A
Country	US
Kind code	B2
Filing date	Jul 28, 2021
Priority date	Jul 28, 2020
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

An energy storage cell includes a cylindrical housing that encloses an interior space and a housing casing, a wound composite body arranged in the interior space and having a helical structure including at least two electrode strips and at least one separator strip arranged between the electrode strips, each including a strip-shaped current collector having an active material coating, the wound composite body includes two terminal end faces, a circumferential outer composite body lateral surface and a circumferential inner composite body lateral surface, the inner composite body lateral surface defines an axially oriented cavity, a winding core having a substantially cylindrical or hollow cylindrical shape and has an outer circumferential surface that rests flat on the inner composite body lateral surface, and the winding core has a local deviation from the cylindrical or hollow cylindrical shape in at least one region of the outer circumferential surface.

First claim

The invention claimed is:

1 . An electrochemical energy storage cell comprising:
a. a cylindrical housing that encloses an interior space and has a top side and an underside and a circumferential housing casing in between, b. the housing casing has an inner housing lateral surface that delimits the interior to the outside, c. a wound composite body shaped in a hollow cylindrical manner is arranged in the interior space and has a helical structure comprising at least two electrode strips helically wound around a winding axis and at least one separator strip arranged between the electrode strips, wherein there is no direct electrical contact between the two electrode strips, d. the electrode strips each comprise a strip-shaped current collector having an active material coating on both sides, e. the wound composite body shaped in a hollow cylindrical manner comprises two terminal end faces, a circumferential outer composite body lateral surface and a circumferential inner composite body lateral surface, f. the inner composite body lateral surface defines an axially oriented cavity in the center of the wound composite body, g. a winding core having a substantially cylindrical or hollow cylindrical shape is arranged in the axially oriented cavity and has an outer circumferential surface that rests flat on the inner composite body lateral surface, and h. the winding core has a local deviation from the cylindrical or hollow cylindrical shape in at least one region of the outer circumferential surface,
wherein the helical structure of the wound composite body comprises at least one local irregularity in at least one region in which one of the wound electrode strips ends and/or there is a sudden change in the thickness of one of the electrode strips, and
the at least one region of the outer circumferential surface of the winding core, in which the local deviation from the cylindrical or hollow cylindrical shape occurs, is spatially assigned to the local irregularity of the wound composite body in the at least one region in which one of the wound electrode strips ends and/or there is a sudden change in the thickness of one of the electrode strips.

2 . The electrochemical energy storage cell according to claim 1 having at least one of:
a. the local deviation from the cylindrical or hollow cylindrical shape involves a stepped or continuous reduction and/or expansion of the outer diameter of the winding core, and
b. the local deviation involves at least one stepped or continuous reduction and/or expansion of the outer diameter of the winding core, wherein the at least one stepped or continuous reduction and/or expansion of the outer diameter extends axially over preferably the entire height of the winding core.

3 . The electrochemical energy storage cell according to claim 1 having at least one of:
a. the local deviation in the at least one region of the outer circumferential surface of the winding core involves a depression in the outer circumferential surface of the winding core and/or a curvature of the outer circumferential surface of the winding core, and
b. the local deviation in at least one region of the outer circumferential surface of the winding core involves a depression in the outer circumferential surface of the winding core and/or a curvature of the outer circumferential surface of the winding core, wherein the depression and/or the curvature extend(s) axially over preferably the entire height of the winding core.

4 . The electrochemical energy storage cell according to claim 1 having at least one of:
a. the winding core is in the form of a hollow cylinder and has an inner core lateral surface that delimits an axially oriented cavity in the interior of the winding core,
b. the winding core has, as a local deviation, a depression in the outer circumferential surface and a corresponding curvature projecting into the axially oriented cavity, and
c. the winding core has, as a local deviation, a curvature of the outer circumferential surface and a corresponding depression in the inner core lateral surface.

5 . The electrochemical energy storage cell according to claim 1 wherein
a. the local deviation in the at least one region of the outer circumferential surface of the winding core in the form of a hollow cylinder comprises an aperture in the wall of the winding core or a slot in the wall.

6 . The electrochemical energy storage cell according to claim 1 having at least one of:
a. the outer circumferential surface of the winding core has one or more depressions to accommodate at least one sensor, and
b. the outer circumferential surface of the winding core has one or more depressions to accommodate at least one sensor, wherein the depression(s) extend(s) axially over preferably the entire height of the winding core.

7 . The electrochemical energy storage cell according to claim 1 having at least one of:
a. the housing casing has a hollow cylindrical shape, and
b. the housing casing has a local deviation from the hollow cylindrical shape in at least one region of its inner housing lateral surface.

8 . The electrochemical energy storage cell according to claim 7 , wherein
a. the at least one region of the inner housing lateral surface having the local deviation is spatially assigned to a local defect of the wound composite body.

9 . The electrochemical energy storage cell according to claim 7 having at least one of:
a. the local deviation involves a stepped or continuous reduction and/or expansion of the inner diameter of the housing casing,
b. the local deviation involves a stepped or continuous reduction and/or expansion of the inner diameter of the housing casing, wherein the stepped or continuous reduction and/or expansion of the inner diameter extend(s) axially over preferably the entire height of the housing,
c. the local deviation involves a depression in the inner housing lateral surface and/or a curvature of the inner housing lateral surface, and
d. the local deviation involves a depression in the inner housing lateral surface and/or a curvature of the inner housing lateral surface, wherein the depression and/or curvature extend(s) axially over the entire height of the housing.

10 . The electrochemical energy storage cell according to claim 1 having one of:
a. the electrochemical energy storage cell is a cylindrical round cell, or
b. the electrochemical energy storage cell is a button cell.

11 . A method of producing an electrochemical energy storage cell comprising:
a. arranging at least one separator strip between at least two electrodes strips each having a strip-like current collector with an active material coating on both sides, b. providing a winding core having a substantially cylindrical or hollow cylindrical shape and an outer circumferential surface, wherein the outer circumferential surface of the winding core has a deviation from a cylindrical or hollow cylindrical shape in at least one region, c. producing a wound composite body by helically winding the electrode strips and the at least one separator strip around the winding core to form a helical structure, wherein the winding is carried out such that the deviation is spatially assigned to a local defect in the helical structure, d. providing a cylindrical housing for the energy storage cell, e. introducing the wound composite body into the housing, and f. electrically contacting the wound composite body and the housing and closing the housing.

Assignees

• Varta Microbattery Gmbh

Inventors

• Hald Rainer
• Schreiber Werner

Classifications

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0427

  Button cells · CPC title

• Y02P70/50

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

• Y02E60/10

  Energy storage using batteries · CPC title