KR-102962330-B1 - electrochemical cell

KR102962330B1KR 102962330 B1KR102962330 B1KR 102962330B1KR-102962330-B1

Abstract

The present invention relates to a electrochemical cell (10; 100) comprising at least one strip-shaped cathode and at least one strip-shaped anode. The at least one cathode and the at least one anode each comprise a current collector and an electrochemically active component applied to the current collector. In the process, the at least one cathode and the at least one anode form an assembly and are separated from each other by at least one separator. The assembly comprising at least one cathode, at least one separator, and at least one anode is wound spirally around a winding axis (14) to form a winding (19). The cathode and the anode are configured and/or arranged within the assembly relative to each other such that the longitudinal edge of the current collector of the cathode protrudes from one of the terminal end faces and the longitudinal edge of the current collector. The cell comprises at least one contact sheet metal member that is in direct contact with one of the protruding longitudinal edges and is connected to this longitudinal edge by welding. The winding (19) includes a central cavity (20) through which a winding axis (14) passes, and the battery has a housing having first and second end faces (11, 12) and an annular housing shell (13) that seals and surrounds the internal space in which the winding (19) is disposed. At least one sensor means (24, 21) or at least a part (25) of the sensor means capable of qualitatively and/or quantitatively detecting a change in the state of the winding (19) is disposed in the central cavity (20), and the first and/or second end faces (11, 12) have a display means and/or contact means (23) capable of displaying a measurement value detected by at least one sensor means (24, 21, 25) and/or transmitting such measurement value to a receiving unit and/or evaluation unit.

Inventors

스톡, 스테판
피틀릭, 에드워드
엔슬링, 데이비드
엘머, 마틴

Assignees

바르타 마이크로바테리 게엠베하

Dates

Publication Date: 20260507
Application Date: 20210428
Priority Date: 20200529

Claims (14)

As an electrochemical cell (10; 100), a. The battery comprises at least one ribbon-shaped negative electrode, and b. The battery includes at least one ribbon-shaped positive electrode, and c. The at least one cathode and the at least one anode each comprise a current collector and an electrochemically active component applied to the current collector, and d. The at least one cathode and the at least one anode form an assembly and are separated from each other by at least one separator, and e. An assembly comprising at least one cathode, at least one separator, and at least one anode is wound spirally around a winding axis (14) to form a winding (19), and the winding has two terminal end faces and a cylindrical winding shell, f. The cathode and the anode are configured such that the longitudinal edge of the current collector of the cathode protrudes from one of the terminal end faces and the longitudinal edge of the current collector of the anode protrudes from the other end face of the winding, and are arranged relative to each other within the assembly, and g. The battery includes at least one contact sheet metal member that is in direct contact with one of the protruding longitudinal edges and connected to the longitudinal edge by welding, and h. The winding (19) includes a central cavity (20) through which the winding shaft (14) passes, and i. The battery has a housing having first and second end faces (11, 12) and an annular housing shell (13) that seals and surrounds an internal space in which a winding (19) is disposed. j. At least one sensor means (24, 21) or at least a part (25) of the sensor means capable of qualitatively and/or quantitatively detecting a change in the state of the winding (19) is disposed in the central cavity (20), and k. The first and/or second end surfaces (11, 12) have a display means and/or contact means (23) capable of displaying a measurement value detected by at least one sensor means (24, 21, 25) and/or transmitting said measurement value to a receiving unit and/or evaluation unit, and The above at least one sensor means (24, 21) includes a pressure sensor (25), and An elongated carrier body (15) is disposed in the central cavity (20) above, and The above-mentioned at least one sensor means comprises an elongated hollow body (15) protruding into the central cavity, and an electrochemical cell in which an internal space enclosed by a housing through the elongated hollow body (15) is connected to a pressure sensor (25).
In paragraph 1, a. At least one sensor means includes a reference electrode (24). b. At least one sensor means includes a temperature sensor (21). having at least one additional feature Electrochemical cell.
In paragraph 2, a. The reference electrode (24) is located in the central cavity (20). b. The sensor means includes at least one connection means (15) through which a measurement value determined by a reference electrode (24) can be transmitted to a display and/or contact means (23). having at least one additional feature Electrochemical cell.
In paragraph 3, a. The reference electrode (24) comprises lithium or a lithium-containing material, and at least one connecting means (15) is an electrical conductor. having additional features Electrochemical cell.
In any one of paragraphs 2 through 4, a. The temperature sensor (21) is located in the central cavity (20). b. The sensor means includes at least one connection means (22) through which a measurement value determined by the temperature sensor (21) can be transmitted to a display and/or contact means (23). having at least one additional feature Electrochemical cell.
In paragraph 5, a. The temperature sensor (21) is a temperature-dependent resistor or includes a temperature-dependent resistor, and at least one connection means includes an electrical conductor (22). having additional features Electrochemical cell.
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In paragraph 1, a. The above-mentioned elongated hollow body (15) is composed of at least a portion of glass and/or ceramic and/or metal and/or plastic. b. The above-mentioned elongated hollow body (15) is at least partially or completely electrically conductive. c. The above-mentioned elongated hollow body (15) is at least partially coated with an electrically conductive material. d. The above-mentioned elongated hollow body (15) is electrically insulated from the housing and/or at least one electrode. e. The above-mentioned elongated hollow body (15) is sealedly connected to at least one of the end surfaces (11, 12) of the housing. having at least one additional feature Electrochemical cell.
In paragraph 1, a. The pressure sensor (25) is located on one of the end surfaces (12) of the housing. b. The pressure sensor (25) is a piezo pressure sensor. having at least one additional feature Electrochemical cell.
In paragraph 1, a. The above-mentioned elongated hollow body (15) is positioned for temperature control of the battery (10). b. The above-mentioned elongated hollow body (15) is in contact with an external temperature control device. having at least one additional feature Electrochemical cell.
In paragraph 1, a. The display and/or contact means includes a PCB board (23). b. The display and/or contact means is a PCB board (23). c. Display and/or contact means are placed on the PCB board. having at least one additional feature Electrochemical cell.
In Paragraph 11, a. The PCB board (23) has a central recess or opening for accommodating at least one sensor means (24, 21, 25) and/or an elongated hollow body (15) according to claim 9. b. The PCB board (23) is sealedly connected to the surrounding area of the end surface (11, 12) or the surrounding housing shell. c. The PCB board (23) is sealedly connected to the surrounding area of the end face (11, 12) or the surrounding housing shell. d. The PCB board (23) forms part of the battery housing, the end surface of the housing, or part of the end surface. having at least one additional feature Electrochemical cell.
In paragraph 1, a. The battery (10) is a lithium-ion battery. b. The battery (10) is a cylindrical circular battery. c. The battery (10) is a button cell. having at least one additional feature Electrochemical cell.
In the method for manufacturing a battery according to paragraph 1, a. A step of providing a cylindrical winding having a central cavity comprising a spirally wound assembly of at least one ribbon-shaped cathode, at least one separator, and at least one ribbon-shaped anode. b. A step in which a cup-shaped housing portion having an annular housing shell (13), a housing bottom, and an end face opening is provided. c. The winding (19) is inserted into the housing portion through the end face opening. d. A step in which the end face opening is closed by the second disc-shaped housing portion. e. Winding (19) is a step in which it is soaked with an electrolyte. f. A step in which at least one sensor means or at least a portion of the sensor means capable of qualitatively and/or quantitatively detecting a change in the winding state is introduced into the central cavity of the winding. g. A step comprising disposing of a display and/or contact means (23) on a housing bottom (12) capable of displaying and/or transmitting to a receiving and/or evaluation unit measured values detected by at least one sensor means (24, 21, 25), and The above at least one sensor means (24, 21) includes a pressure sensor (25), and An elongated carrier body (15) is disposed in the central cavity (20) above, and A battery manufacturing method wherein at least one sensor means comprises an elongated hollow body (15) protruding into the central cavity, and an internal space enclosed by a housing through the elongated hollow body (15) is connected to a pressure sensor (25).

Description

electrochemical cell The present invention relates to an electrochemical cell, in particular a secondary electrochemical cell, and a method for manufacturing such an electrochemical cell. In an electrochemical cell, an electrochemical energy supply reaction occurs, consisting of two partial reactions that are electrically coupled but spatially separated. One partial reaction, occurring at a relatively low redox potential, takes place at the cathode, while the other partial reaction, occurring at a relatively high redox potential, takes place at the anode. During discharge, electrons are emitted from the cathode as a result of the oxidation process, causing an electron flow to the anode through an external consumer, where a corresponding amount of electrons is absorbed. Consequently, the reduction process occurs at the anode. Simultaneously, an ionic current corresponding to the electrode reactions is generated within the electrochemical cell to equalize the charge. This ionic current passes through a separator and is supported by an ion-conducting electrolyte. In a secondary (rechargeable) electrochemical cell, since this discharge reaction is reversible, the conversion of chemical energy generated during discharge into electrical energy can be reversed. When the terms "anode" and "cathode" are used in relation to secondary electrochemical cells, the electrodes are generally named according to their discharge function. Thus, the negative electrode of such a cell is the anode, and the positive electrode is the cathode. A well-known example of a secondary electrochemical battery is a lithium-ion battery. It includes an electrode capable of reversibly absorbing and releasing lithium ions and an electrolyte containing lithium ions. Lithium-ion batteries generally include electrodes and separators in the form of assemblies. These assemblies can be battery stacks composed of multiple cells. However, in most cases, the assembly is a single cell in a wound form (winding assembly or simply winding cell). In an assembly, the anode, cathode, and separator are typically placed flat on top of each other. In most cases, the electrodes and separator are connected, for example, by lamination or bonding. Generally, composite assemblies include a sequence of anode/separator/cathode, regardless of whether they are wound. Often, assemblies are manufactured as so-called bi-cells having possible sequences of cathode/separator/anode/separator/cathode or anode/separator/cathode/separator/anode. In automotive applications or other applications with high energy requirements, multiple winding electrochemical cells are often connected to form battery modules that generate high voltage. If even a single cell fails to operate normally, the entire module can be damaged. Therefore, it is advisable to monitor the operation of the cells, as this allows for the timely detection of problematic conditions and the initiation of appropriate corrective measures. Various approaches for integrating sensor technology into electrochemical cells are already known. For example, international patent application WO 2013/120668 A1 describes a sensor device for a battery of an electric energy storage device, wherein a device for recording sensor data is provided in addition to a reference electrode within the housing of the battery, wherein the device is connected to an anode and a cathode. In this way, data regarding, for example, the temperature and/or pressure of the battery can be obtained. German patent application publication DE 10 2012 223 480 A1 describes a battery having a device for monitoring at least one parameter of the battery, said device comprising at least one sensor, for example, a chemical sensor or a voltage sensor. An operating voltage required for the operation of the monitoring device is drawn from the battery. The present invention is based on the objective of providing a technical solution capable of monitoring the operation of individual electrochemical cells in a battery module. The solution should be integrated into the electrochemical cell manufacturing process as easily as possible. This objective is achieved by the electrochemical cell and method described below, in particular by a preferred embodiment of the electrochemical cell described below having the features of claim 1. A preferred embodiment of this cell will also be apparent from the dependent claims. Additionally, this objective is achieved by a method for manufacturing such a cell according to another independent claim. The electrochemical cell according to the present invention is always characterized by the following features: a. The battery comprises at least one ribbon-shaped negative electrode, and b. The battery includes at least one ribbon-shaped positive electrode, and c. The at least one cathode and the at least one anode form an assembly and are separated from each other by at least one separator, and d. An assembly of at least one cathode, at least one s