US-20260128357-A1 - SOLID-STATE BATTERY SYSTEM

Abstract

The present invention relates to a solid-state accumulator system having at least one solid-state accumulator system with a preferential dimensional-change direction and having at least one solid-state accumulator holder, which is configured to counteract the dimensional change of the solid-state accumulator in the dimensional-change direction by means of at least one variable fluid volume.

Inventors

• Lukas Kuehne
• Max Konstantin Werhahn
• Peter Michael Marienfeld

Assignees

• CONTITECH VIBRATION CONTROL GMBH

Dates

Publication Date

20260507

Application Date

20230828

Priority Date

20220928

Claims (17)

1. 1 . A solid-state accumulator system having at least one solid-state accumulator with a dimensional-change direction and having at least one solid-state accumulator holder which is configured to counteract the dimensional change of the solid-state accumulator in the dimensional-change direction by at least one variable fluid volume.
2. 2 . The solid-state accumulator system as claimed in claim 1 , wherein the variable fluid volume is formed by a gas,
3. 3 . The solid-state accumulator system as claimed in claim 2 , wherein the solid-state accumulator holder comprises at least one compressor which is configured and adapted to generate a predetermined pressure of the gas.
4. 4 . The solid-state accumulator system as claimed in claim 2 , wherein the solid-state accumulator holder comprises at least one check valve, which is configured and adapted to open at a predetermined pressure of the variable fluid volume.
5. 5 . The solid-state accumulator system as claimed in claim 1 , wherein the variable fluid volume is formed by a hydraulic liquid, wherein the solid-state accumulator holder comprises at least one variable equalizing volume which is connected in a fluid-conducting manner to the variable fluid volume and is configured to exert a force on the liquid.
6. 6 . The solid-state accumulator system as claimed in claim 5 , wherein the variable equalizing volume is configured as an elastic equalizing volume having an elastic outer shell which holds the liquid in an inner volume
7. 7 . The solid-state accumulator system as claimed in claim 6 , wherein the elastic outer shell comprises, preferably consists of, an elastomeric material, which is fiber-reinforced and provided with tension cords.
8. 8 . The solid-state accumulator system as claimed in claim 5 , wherein the variable equalizing volume is configured as a rigid equalizing volume having an equalizing chamber the volume of which is variable by a movable spring-loaded or pressure-loaded piston.
9. 9 . The solid-state accumulator system as claimed in one of claim 1 , wherein the variable fluid volume is configured to exert a preload on the solid-state accumulator
10. 10 . The solid-state accumulator system as claimed in one of claim 1 , wherein the solid-state accumulator holder comprises at least one fluid inlet, which is configured and adapted to allow the quantity of fluid of the variable fluid volume to be introduced.
11. 11 . The solid-state accumulator system as claimed in one of claim 1 , wherein the solid-state accumulator holder comprises at least one pressure sensor, which is configured and adapted to detect a pressure of the fluid within the variable fluid volume
12. 12 . The solid-state accumulator system as claimed in one of claim 1 , wherein the variable fluid volume comprises, an elastomeric material, which is fiber-reinforced and provided with tension cords.
13. 13 . The solid-state accumulator system as claimed in claim 1 , wherein the solid-state accumulator comprises a plurality of accumulator cells which are arranged in the dimensional-change direction and/or perpendicular to the preferential dimensional-change direction, wherein the solid-state accumulator holder is configured to counteract the dimensional change of all the accumulator cells in the dimensional-change direction by at least the variable fluid volume
14. 14 . The solid-state accumulator system as claimed in claim 1 , wherein the solid-state accumulator holder comprises a plurality of variable fluid volumes which are configured and arranged to counteract the dimensional change of one accumulator cell of the solid-state accumulator in the dimensional-change direction on one side or on both sides.
15. 15 . The solid-state accumulator system as claimed in claim 1 , wherein the solid-state accumulator holder comprises at least one variable supplementary volume which is arranged parallel to the variable fluid volume, wherein the variable supplementary volume is connected by a first check valve to an ambient fluid, preferably to the ambient air, in order to receive ambient fluid when the pressure is falling, and wherein the variable supplementary volume is connected by a second check valve to the variable fluid volume in order to discharge fluid to the variable fluid volume when the pressure is rising, so that a constant pressure can be maintained in the variable supplementary volume
16. 16 . A solid-state accumulator holder for use in a solid-state accumulator system as claimed in claim 1 .
17. 17 . A solid-state accumulator system comprising: a solid-state accumulator with a dimensional-change direction; a solid-state accumulator holder configured to counteract a dimensional change of the solid-state accumulator in the dimensional-change direction by a fluid volume; a compressor of the solid-state accumulator holder, the compressor to generate a predetermined pressure of the fluid volume; a check valve to open at a second pressure of the fluid volume; a hydraulic liquid as the fluid volume; a variable equalizing volume to exert a force on the fluid volume, the variable equalizing volume configured as an elastic equalizing volume having an elastic outer shell; and an elastomeric material reinforced with fiber and tension cords as the outer shell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a National Stage Application under 35 U.S.C. § 371 of International Patent Application No. PCT/DE 2023/200174 filed on Aug. 28, 2023, and claims priority from German Patent Application No. 10 2022 210 267.3 filed on Sep. 28, 2022, the disclosures of which are herein incorporated by reference in their entireties. BRIEF SUMMARY The present invention relates to a solid-state accumulator system and to a solid-state accumulator holder for use in such a solid-state accumulator system. It is known to store electrical energy in order to allow the electrical energy to be used at a later time and/or in a mobile manner. Mobile applications can be, for example, electronic entertainment and communication devices such as, for example, mobile telephones as well as vehicles which can be driven partially or completely electrically. In each case, rechargeable electrical energy stores can be used for this purpose, which may also be referred to as accumulators. Accumulators are also referred to as secondary batteries and are abbreviated colloquially to “Akkus” in German. An accumulator is a rechargeable galvanic element, which comprises two electrodes and an electrolyte, which is able to store the electrical energy electrochemically. The electrolyte in question serves to conduct ions between an anode and a cathode. Depending on the application, accumulators can be produced in different sizes and shapes. For example, the accumulators of mobile telephones are usually flat and rectangular, in order to be as space-saving as possible. If the required installation space is not as important, then accumulators are often cylindrical. Cylindrical accumulators and rectangular accumulators are used for many domestic electrical devices. Cylindrical accumulators in particular are mostly used in multiples and are connected in series and/or arranged one behind the other so as to contact one another directly, for example in remote controls for electronic devices and the like. In battery electric vehicles (BEV) too, which may also be referred to as electric cars, a large number of accumulators, in particular cylindrical accumulators, are usually used in combination with one another. The accumulators are often arranged spatially parallel to one another in the bottom of the chassis of the vehicle. The individual accumulators can be interconnected according to the application or according to the manufacturer. The accumulators differ from one another substantially in terms of the technology of the storage of the electrical energy, which is dependent substantially on the electrolyte used. Thus, lithium-ion accumulators, which are based on lithium compounds in all three phases of the electrochemical cell, are widely used nowadays. Lithium-ion accumulators have a comparatively high specific energy, that is to say a comparatively high energy per unit mass, and are usually used in mobile telephones but also in battery electric vehicles. In battery electric vehicles, however, lead-or nickel-based accumulators are also used. It is common to these accumulators that a liquid electrolyte is used in each case. A common disadvantage of accumulators with liquid electrolytes is that the accumulators have to be cooled in order to prolong the working life of the electrodes. This represents a not inconsiderable additional outlay. In particular, the required cooling and other devices can account for more than half of the volume of, for example, a lithium-ion accumulator. In order to prolong the working life of the accumulators, full charging and discharging thereof should also be avoided. A further disadvantage of accumulators with liquid electrolytes is that most liquid electrolytes are combustible, which can make additional safety devices necessary. Furthermore, the liquid electrolyte can escape in the event of damage, which can likewise lead to additional safety measures. A further safety risk can occur in the case of accumulators with liquid electrolytes as a result of very low or very high ambient temperatures, since the liquid electrolytes can then freeze or boil. Accumulators with an electrolyte of solid material are further known, which may also be referred to as solid-state accumulators. Owing to the solid materials of the electrolytes, the electrolytes cannot escape in the event of damage, which can increase the safety of the use of solid-state accumulators, or corresponding additional safety measures can be dispensed with. Also, the solid materials of the electrolytes are not normally flammable. Furthermore, solid-state accumulators usually have a longer working life than accumulators with liquid electrolytes and are easier to store. Solid-state accumulators can also be miniaturized more easily and can be manufactured in particular in the form of a thin layer. Furthermore, solid-state accumulators do not usually exhibit any safety problems or any abrupt changes in their power in the event of temp