Electrochemical energy store

• US 9,608,301 B2
• Filed: 05/15/2008
• Issued: 03/28/2017
• Est. Priority Date: 05/23/2007
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Thiemann-Handler, Sabine, Koenigsmann, Martin Holger
• Primary Examiner(s): Ridley, Basia
• Assistant Examiner(s): CHAN, HENG M
• Application Number:
  US12/600,780
• Publication Number:
  US 20100203397A1
• Time in Patent Office: 3,239 Days
• Field of Search: 429/403, 429/402, 429/407, 429/91
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 12/04 composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
• CPC Class Codes: H01M 12/08 composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
• CPC Class Codes: H01M 14/00 Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An electrochemical energy store including at least one anode and at least one cathode in an electrolyte, lithium peroxide being generated at the cathode by the reaction of lithium ions with oxygen. The cathode is connected to an oxygen reservoir.

Claims

1. An electrochemical energy store, comprising:

a plurality of cells, each including;

an anode;

a cathode;

a solid electrolyte between the anode and the cathode, wherein the anode is disposed adjacent to a first side of the solid electrolyte and the cathode is disposed adjacent to a second side of the solid electrolyte that is opposite the first side so that the solid electrolyte separates completely the anode from the cathode;

a gas chamber at least partially delineated, and separated from the anode and electrolyte, by the cathode; and

a valve connected to the gas chamber;

an oxygen reservoir connected to the valve of each of the plurality of cells; and

a control system having a plurality of control lines, each connected to the valve of a respective different one of the plurality of cells to individually control an oxygen supply to the gas chamber of the respective cell.

2. The electrochemical energy store as recited in claim 1, wherein each gas chamber is bounded by a side of the cathode that is opposite a side of the cathode that is adjacent to the solid electrolyte.

3. An electrochemical energy store, comprising:

a plurality of cells, each cell including;

at least one anode;

at least one cathode;

a solid electrolyte between the at least one anode and the at least one cathode, wherein the at least one anode is disposed adjacent to a first side of the solid electrolyte and the at least one cathode is disposed adjacent to a second side of the solid electrolyte that is opposite the first side so that the solid electrolyte separates completely the at least one anode from the at least one cathode;

a gas chamber delineated by the at least one cathode and at least one other chamber wall, the gas chamber separated from the at least one anode and the electrolyte by the at least one cathode; and

at least one valve connected to the gas chamber;

an oxygen reservoir hermetically sealed to the gas chamber in each cell via the at least one valve of the cell; and

a control system having a plurality of control lines, each connected to the at least one valve of a respective different one of the plurality of cells to provide a control signal to individually control an oxygen supply to the gas chamber of the respective cell,

wherein lithium peroxide is generated at the cathode by a reaction of lithium ions with oxygen from the oxygen reservoir.

4. The electrochemical energy store as recited in claim 3, wherein each cathode is porous.

5. The electrochemical energy store as recited in claim 3, wherein each cathode includes a lattice structure which has a carrier material as a reaction surface.

6. The electrochemical energy store as recited in claim 3, wherein oxygen contained in the oxygen reservoir is bound chemically in a form of an oxygen-containing compound.

7. The electrochemical energy store as recited in claim 3, wherein oxygen contained in the oxygen reservoir is stored physically.

8. The electrochemical energy store as recited in claim 7, wherein the oxygen reservoir is an oxygen tank.

9. The electrochemical energy store as recited in claim 7, wherein the oxygen is adsorbed in a storage device.

10. The electrochemical energy store as recited in claim 7, wherein a mixture of oxygen and a gas that is inert to the electrochemical reaction is contained in the oxygen reservoir.

11. The electrochemical energy store as recited in claim 10, wherein the gas that is inert to the electrochemical reaction is nitrogen.

12. The electrochemical energy store as recited in claim 3, wherein each anode contains metallic lithium.

13. The electrochemical energy store as recited in claim 3, further comprising:

a pressure sensor for each cell, the pressure sensor connected to the control system, wherein the control system determines a charging state of each cell based on a pressure from the respective pressure sensor and controls the oxygen supply to the gas chamber as a function of the determined charging state.

14. The electrochemical energy store as recited in claim 3, further comprising:

a chemical potential sensor for each cell, the chemical potential sensor connected to the control system, wherein the control system determines a state of health of each cell based on a potential from the respective chemical potential sensor and controls the oxygen supply to the gas chamber as a function of the determined state of health.

15. The electrochemical energy store as recited in claim 3, wherein each valve further controls removal of oxygen from the gas chamber.

16. The electrochemical energy store as recited in claim 3, wherein the control system individually controls the oxygen supply to the gas chamber of each cell as a function of a charging state of the cell.

17. The electrochemical energy store as recited in claim 16, wherein the control system determines the charging state of the cell as a function of at least one of:

a voltage of the cell, a chemical potential of the cell, or a pressure of the cell.

18. The electrochemical energy store as recited in claim 16, further comprising a sensor to provide the at least one of the voltage of the cell, the chemical potential of the cell or the pressure of the cell.

19. The electrochemical energy store as recited in claim 3, wherein the control system individually controls the oxygen supply to the gas chamber of each cell as a function of a state of health of the cell.

20. The electrochemical energy store as recited in claim 3, wherein each gas chamber is bounded by a side of the cathode that is opposite a side of the cathode that is adjacent to the solid electrolyte.