Electrochemical cell

1 . An electrochemical cell, comprising:

a winding comprising a ribbon-shaped negative electrode comprising an anode current collector and an electrochemically active anode component applied to the anode current collector and a ribbon-shaped positive electrode comprising a cathode current collector and an electrochemically active cathode component applied to the cathode current collector, wherein an assembly comprises the negative electrode and the positive electrode, wherein the negative electrode and the positive electrode are separated from each other by a separator, wherein the assembly is wound spirally around a winding axis to form the winding, wherein the winding comprises a central cavity through which the winding axis passes, wherein the winding further comprises two terminal end faces and a circumferential winding shell, wherein the negative electrode and the positive electrode are configured and/or arranged within the assembly relative to each other such that a protruding longitudinal edge of the anode current collector protrudes from one of the terminal end faces and a protruding longitudinal edge of the cathode current collector protrudes from the other of the terminal end faces of the winding;

a contact sheet metal member in direct contact with a respective protruding longitudinal edge and connected to the respective protruding longitudinal edge by welding, wherein the respective protruding longitudinal edge is the protruding longitudinal edge of the anode current collector or the protruding longitudinal edge of the cathode current collector,

a housing having a first end face, a second end face, and an annular housing shell sealingly enclosing an interior space in which the winding is disposed;

a sensor apparatus configured to qualitatively and/or quantitatively detect changes in a state of the winding, the sensor apparatus comprising a pressure sensor and an elongated hollow body projecting into the central cavity, the elongated hollow body providing a communicating connection between the pressure sensor disposed at one of the end faces of the housing and an interior space enclosed by the housing; and

a display and/or a contact configured to display measured values detected by the sensor apparatus and/or via which the measured values can be transmitted to a receiver and/or an evaluator.

2 . The electrochemical cell according to claim 1 , wherein the sensor apparatus further comprises at least one of:

a reference electrode, and/or

a temperature sensor.

3 . The electrochemical cell according to claim 2 , wherein:

the reference electrode is located in the central cavity, and/or

the sensor apparatus comprises at least one connector via which measured values determined by the reference electrode are configured to be transmitted to the display and/or the contact.

4 . The electrochemical cell according to claim 3 , wherein:

the reference electrode comprises lithium or a lithium-containing material, and the at least one connector is an electrical conductor.

5 . The electrochemical cell according to claim 2 , wherein:

the temperature sensor is located in the central cavity, and/or

the sensor apparatus comprises at least one connector via which measured values determined by the temperature sensor are configured to be transmitted to the display and/or the contact.

6 . The electrochemical cell according to claim 5 , wherein:

the temperature sensor is a temperature-dependent resistor or the temperature sensor comprises a temperature-dependent resistor, and the connector comprises an electrical conductor.

7 . The electrochemical cell according to claim 1 , wherein:

the elongated hollow body comprises glass and/or ceramic and/or metal and/or plastic,

the elongated hollow body is electrically conductive at least in parts or completely,

the elongated hollow body is at least partially coated with electrically conductive material,

the elongated hollow body is electrically isolated against the housing and/or at least one of the negative electrode or the positive electrode, and/or

the elongated hollow body is sealingly connected to at least one of the end faces of the housing.

8 . The electrochemical cell according to claim 1 , wherein:

the pressure sensor is disposed at one of the end faces of the housing.

9 . The electrochemical cell according to claim 1 , wherein the elongated hollow body is in contact with an external temperature control device.

10 . The electrochemical cell according to claim 1 , wherein the display and/or contact:

is or comprises a PCB board, and/or

is arranged on a PCB board.

11 . The electrochemical cell according to claim 10 , wherein:

the PCB board has a central recess or aperture for receiving a portion of the elongated hollow body,

the PCB board is sealingly connected to a surrounding area of an end face of the winding or to the annular housing shell, and

the PCB board forms part of the housing.

12 . The electrochemical cell according to claim 1 , wherein:

the electrochemical cell is a cylindrical round cell or a button cell.

13 . The electrochemical cell according to claim 1 , wherein the pressure sensor comprises a piezo pressure sensor.

14 . The electrochemical cell according to claim 1 , wherein the cell is a lithium-ion cell.

15 . A method of manufacturing an electrochemical cell according to claim 1 , the method comprising:

providing the winding;

providing a cup-shaped housing part having the annular housing shell, a housing bottom, and an end face opening;

inserting the winding into the cup-shaped housing part through the end face opening;

closing the end face opening by a second housing part;

soaking the winding with an electrolyte;

introducing at least a portion of the sensor apparatus into the central cavity of the winding; and

arranging the display and/or the contact on the housing bottom.