Apparatus and method for detection of deformation in battery cells

Patent metadata

Field	Value
Publication number	US-11522232-B2
Application number	US-201916285294-A
Country	US
Kind code	B2
Filing date	Feb 26, 2019
Priority date	Feb 26, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A deformation detection apparatus includes a cell movement-control assembly to handle a linear motion and a rotational motion of a battery cell, a body that supports the cell movement-control assembly, a digital micrometer, and control circuitry. The control circuitry controls a displacement of the battery cell between a first position and a second position along a longitudinal axis through a scanning region of the digital micrometer and a plurality of rotational positions of the battery cell at a plurality of charge states and a plurality of discharge states. The control circuitry measures a plurality of outer diameter values of the battery cell for a plurality of linear positions and a plurality of rotational positions along the longitudinal axis of the battery cell and determines a change in a geometrical shape (deformation and/or strain) of the battery cell for the plurality of linear positions and the plurality of rotational positions.

First claim

What is claimed is:

1. A deformation detection apparatus for a battery cell, comprising;
a cell movement-control assembly to handle a linear motion and a rotational motion of the battery cell, wherein the cell movement-control assembly comprises a cell holding terminal to hold a battery cell;
a digital micrometer comprising an emitter component and a receiver component, aligned along an axis orthogonal to the cell movement-control assembly;
a body comprising a base plate that supports the cell movement-control assembly and the digital micrometer; and
a control circuitry communicatively coupled to the cell movement-control assembly and the digital micrometer, wherein the control circuitry is configured to:
control a displacement of the battery cell back and forth from a first position to a second position along a longitudinal axis of the battery cell using the cell movement-control assembly for a defined number of movement cycles, wherein the displacement of the battery cell is through a scanning region of the digital micrometer, at a plurality of charge states and a plurality of discharge states of the battery cell;
receive, from the digital micrometer, a plurality of outer diameter values of the battery cell for a plurality of linear positions and a plurality of rotational positions along the longitudinal axis of the battery cell, at the plurality of charge states and the plurality of discharge states of the battery cell, based on the displacement of the battery cell through the scanning region of the digital micrometer in the linear motion and the rotational motion along the longitudinal axis of the battery cell; and
determine a plurality of strain values for the plurality of linear positions and the plurality of rotational positions along the longitudinal axis of the battery cell for each charge state of the plurality of charge states of the battery cell, based on the plurality of outer diameter values.

2. The deformation detection apparatus according to claim 1 , wherein the control circuitry is further configured to monitor a change in a geometrical shape of the battery cell, for the plurality of linear positions and the plurality of rotational positions along the longitudinal axis of the battery cell, at each of the plurality of charge states and the plurality of discharge states of the battery cell, and wherein the change in the geometrical shape is monitored based on the received plurality of outer diameter values of the battery cell.

3. The deformation detection apparatus according to claim 2 , wherein the control circuitry is further configured to detect a deformation of the battery cell based on a monitored change in a geometrical shape of the battery cell.

4. The deformation detection apparatus according to claim 1 , further comprising a gear motor controllable by the control circuitry.

5. The deformation detection apparatus according to claim 1 , further comprising:
a first slip ring configured to engage a first end of the battery cell; and
a second slip ring configured to engage a second end of the battery cell.

6. The deformation detection apparatus according to claim 5 , further comprising:
a first shaft configured to engage the first slip ring; and
a second shaft configured to engage the second slip ring.

7. The deformation detection apparatus according to claim 1 , wherein the cell movement-control assembly includes at least one linear bearing carriage that engages guide rails to position the cell movement-control assembly with respect to the digital micrometer.

8. The deformation detection apparatus according to claim 1 , further comprising a plurality of rotation stoppers.

9. A deformation detection apparatus for a battery cell, comprising;
a cell movement-control assembly to handle a linear motion and a rotational motion of the battery cell, wherein the cell movement-control assembly comprises a cell holding terminal to hold a battery cell;
a digital micrometer aligned along an axis orthogonal to the cell movement-control assembly;
a body that supports the cell movement-control assembly and the digital micrometer; and
a control circuitry communicatively coupled to the cell movement-control assembly and the digital micrometer, wherein the control circuitry is configured to:
control a displacement of the battery cell between a first position and a second position along a longitudinal axis of the battery cell using the cell movement-control assembly for a plurality of movement cycles, wherein the displacement of the battery cell is through a scanning region of the digital micrometer, at a plurality of charge states and a plurality of discharge states of the battery cell;
receive, from the digital micrometer, a plurality of outer diameter values of the battery cell for a plurality of linear positions and a plurality of rotational positions along the longitudinal axis of the battery cell, at the plurality of charge states and the plurality of discharge states of the battery cell, based on the displacement of the battery cell through the scanning region of the digital micrometer in the linear motion and the rotational motion along the longitudinal axis of the battery cell; and
determine a change in a geometrical shape of the battery cell, for the plurality of linear positions and the plurality of rotational positions along the longitudinal axis of the battery cell, at each of the plurality of charge states and the plurality of discharge states of the battery cell, and wherein the change in the geometrical shape is monitored based on the received plurality of outer diameter values of the battery cell.

10. The deformation detection apparatus according to claim 9 , wherein the control circuitry is further configured to detect a deformation of the battery cell based on a monitored change in a geometrical shape of the battery cell.

11. The deformation detection apparatus according to claim 9 , further comprising a gear motor controllable by the control circuitry.

12. The deformation detection apparatus according to claim 9 , further comprising:
a first slip ring configured to engage a first end of the battery cell; and
a second slip ring configured to engage a second end of the battery cell.

13. The deformation detection apparatus according to claim 12 , further comprising:
a first shaft configured to engage the first slip ring; and
a second shaft configured to engage the second slip ring.

14. The deformation detection apparatus according to claim 9 , wherein the cell movement-control assembly includes at least one linear bearing carriage that engages guide rails to position the cell movement-control assembly with respect to the digital micrometer.

15. The deformation detection apparatus according to claim 9 , further comprising a plurality of rotation stoppers.

16. A method of detection of deformation in a battery cell, comprising:
in control circuitry of a deformation detection apparatus that includes at least a cell movement-control assembly and a digital micrometer:
displacing, by use of the cell movement-control assembly, the battery cell back and forth between a first position and a second position along a longitudinal axis of the battery cell, wherein the displacement of the battery cell is through a scanning region of the digital micrometer for a plurality of charge states and a plurality of discharge states of the battery cell, for a defined number of movement cycles;
controlling the plurality of charge states and the plurality of discharge states of the battery cell during the displacement of the battery cell back and forth from the first position to th

Assignees

• Tesla Inc

Inventors

• Kahn Michael

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• G01B21/10 Primary

  for measuring diameters · CPC title

• G01B5/30

  for measuring the deformation in a solid, e.g. mechanical strain gauge · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• G01B11/10

  of objects while moving · CPC title