Electrical energy storage

Abstract

The invention relates to an electrical energy storage device (1) comprising a cell cover (3), a cell cup (5) and an electrode stack (7), wherein the electrode stack (7) is arranged in the cell cup (5) and the cell cup (5) is closed by the cell cover (3), wherein a fastening interface (9) is integrated into the cell cover (3) to which a measuring device (11) can be detachably attached directly or indirectly.

Description

[0001] The invention relates to an electrical energy storage device with the features of the preamble of claim 1.

[0002] From WO 2013 / 174591 A1, a battery cell is known with a device for determining a state variable of a cell for converting chemical energy into electrical energy, wherein the cell has at least one galvanic cell and a housing surrounding the galvanic cell. The device comprises a force sensor for determining a change in the cell's volume in order to determine the state variable based on the volume change, and / or a gas pressure sensor for determining the internal gas pressure of the cell in a free space located between the at least one galvanic cell and the housing in order to determine the state variable based on the internal gas pressure.

[0003] The invention is based on the objective of providing an electrical energy storage device which enables simple acquisition of measured quantities of the electrical energy storage device.

[0004] The problem is solved according to the invention by an electrical energy storage device with the features of claim 1.

[0005] Advantageous embodiments of the invention are the subject of the dependent claims.

[0006] The electrical energy storage device according to the invention, comprising a cell lid, a cell cup and an electrode stack, wherein the electrode stack is arranged in the cell cup and the cell cup is closed by the cell lid, provides that a fastening interface is integrated into the cell lid, to which a measuring device can be detachably attached directly or indirectly.

[0007] Specifically, the electrical energy storage device is a single secondary cell (also called an accumulator), i.e., a rechargeable galvanic cell. It is specifically an electrical energy storage device for a vehicle.

[0008] Using the electrical energy storage device according to the invention, physical quantities inside the energy storage device can be measured with minimal technical effort. For example, during a thermal runaway test with an electrical energy storage device, the current pressure and / or the pressure profile inside the device can be easily recorded. Furthermore, other physical quantities inside the electrical energy storage device can also be easily recorded.

[0009] One advantage of the invention is the integration of the mounting interface into the cell lid, which eliminates the need to laboriously open the completed energy storage device to determine measured parameters. Additionally, contact with an electrolyte located inside the energy storage device can be prevented.

[0010] Exemplary embodiments of the invention are explained in more detail below with reference to drawings.

[0011] This shows: Fig. 1. Schematic exploded view of an electrical energy storage device, Fig. 2 schematically an electrical energy storage device, Fig. 3. A schematic representation of a cell lid in perspective, Fig. 4 schematically an enlarged representation of a cell lid with a fastening interface, Fig. 5 schematically a sectional view of a cell lid with a fastening interface, and Fig. Figure 6 schematically shows an electrical energy storage device with a measuring device.

[0012] Corresponding parts are marked with the same reference symbols in all figures.

[0013] Fig. Figure 1 schematically shows an exploded view of an electrical energy storage device 1.

[0014] The electrical energy storage device 1, for example, is designed in multiple parts and comprises a cell cover 3 and a cell cup 5. Additionally, the electrical energy storage device 1 includes an electrode stack 7, which is arranged or can be arranged in the cell cup 5. The cell cup 5 with the electrode stack 7 arranged inside it can be closed or sealed, in particular, by the cell cover 3.

[0015] The cell lid 3 has, in particular, a fastening interface 9. The fastening interface 9 is, for example, integrated into the cell lid 3. The cell lid 3 has, for example, a through-opening 13 into which the fastening interface 9 is or can be arranged. The through-opening 13 extends, for example, perpendicular to the cell cup 5 and can be hollow and cylindrical. The through-opening 13 can, for example, be a through-opening 13 already present in the cell lid 3. For example, the fastening interface 9 is integrated into a pre-existing through-opening 13 of the cell lid 3, such as an electrolyte filling hole.

[0016] Alternatively or additionally, the mounting interface 9 can be arranged and attached separately to the cell lid 3. The mounting interface 9 can, for example, be placed on the through-opening 13. Additionally, the mounting interface 9 has a through-opening 10. The through-opening 10 is arranged, in particular, above the through-opening 13, so that the through-opening 10 extends from the mounting interface 9 into the cell cup 5.

[0017] Additionally, the mounting interface 9 can be set up, a measuring device 11 (shown in Fig. 6) to be included. For this purpose, the fastening interface 9 includes, for example, a thread.

[0018] The fastening interface 9 is, for example, designed as an internal thread 15. The internal thread 15 is located in or formed within the through-opening 13. Alternatively or additionally, the fastening interface 9 can also have an external thread.

[0019] For example, the fastening interface 9 is materially bonded to the cell lid 3 or integrally molded onto it.

[0020] Additionally, a positive terminal 20 and a negative terminal 21 are arranged on the cell cover 3. The positive terminal 20 and negative terminal 21 are, for example, spaced apart from each other on the cell cover 3. The fastening interface 9 is arranged, in particular, between the positive and negative terminals 20 and 21.

[0021] In Fig. Figure 2 schematically represents the electrical energy storage device 1 according to Fig. Figure 1 shows the assembled state. The cell cover 3 and the cell cup 5 with the electrode stack 7 are connected to form the electrical energy storage device 1. The cell cover 3 and the cell cup 5 are joined together, in particular by a material bond, and form a closed housing for the electrical energy storage device 1. For example, the cell cover 3 is welded onto the cell cup 5, in particular by laser welding.

[0022] The fastening interface 9 is closed, in particular, by a locking element 17. The locking element 17 is, for example, designed as a screw or nut which corresponds to the fastening interface 9 designed as an internal thread 15. Alternatively or additionally, the locking element 17 can correspond to the fastening interface 9 designed as an external thread.

[0023] Fig. Figure 3 shows a schematic perspective view of the cell cover 3. The cell cover 3 includes the through-opening 13, into which the fastening interface 9 is integrated. The fastening interface 9 can, for example, be designed as a connection flange. In particular, the fastening interface 9 can be designed as a sleeve 9.1 with an internal thread 15 and / or an external thread. The sleeve 9.1 has a contact flange 9.2 facing the cell cover 3.

[0024] In Fig. Figure 4 schematically shows an enlarged representation of the cell cover 3 with the fastening interface 9. The through-opening 13 is closed by the closure element 17, in particular hermetically sealed. For example, a sealing ring (not shown in detail) can be provided, which is arranged between the closure element 17 and the through-opening 13. This seals the through-opening 13, in particular hermetically sealed it.

[0025] Fig. Figure 5 schematically shows a sectional view of the cell lid 3 with the fastening interface 9. The locking element 17 is screwed into the internal thread 15 of the fastening interface 9. The locking element 17 is detachably attached to the fastening interface 9.

[0026] In Fig.Figure 6 schematically shows the electrical energy storage device 1 with a measuring device 11, which is arranged and attached to the mounting interface 9.

[0027] The fastening interface 9 is thus set up to receive the locking element 17 when no measurements are being carried out, and to release the locking element 17 and receive the measuring device 11 in order to carry out measurements.

[0028] The measuring device 11 can be used to determine physical quantities inside the electrical energy storage device 1. The measuring device 11 can, for example, be detachably attached directly or indirectly to the mounting interface 9. For instance, the measuring device 11 has a corresponding external thread (not shown) to the internal thread 15. After the locking element 17 has been removed, the measuring device 11 can, for example, be screwed into the internal thread 15.

[0029] The measuring device 11 can, for example, be designed as a pressure measuring device, a temperature measuring device or the like. Reference symbol list 1 Electrical energy storage 3 cell lids 5 cell cups 7 electrode stacks 9 Mounting interface 9.1 Sleeve 9.2 Mounting flange 10 rounds 11 Measuring device 13 Passage opening 15 internal threads 17 Locking element 20 Positive pole 21 Negative terminal QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2013 / 174591 A1

[0002]

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