Scalable and flexible cell-based energy storage system

• US 10,424,923 B2
• Filed: 09/29/2016
• Issued: 09/24/2019
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: Tesla Inc.
• Original Assignee: Tesla Inc.
• Inventors: Ozbek, Mehmet, Pierquet, Brandon, Baglino, Andrew David
• Primary Examiner(s): Fleming, Fritz M
• Assistant Examiner(s): Dhillon, Jagdeep S
• Application Number:
  US15/280,422
• Publication Number:
  US 20170093156A1
• Time in Patent Office: 1,090 Days
• Field of Search: 307 82, 307 91, 307 66, 307 43, 320107, 320141, 320116, 320104, 320150, 320152, 320162, 320112, 363 71
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02M 7/44 by static converters
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/14 Energy storage units

Abstract

An energy storage system includes: a grid tie unit comprising at least one DC/AC converter; and multiple pods connected to the grid tie unit, each pod including: a number of cells; and a power electronics unit, wherein the cells are floating relative to the system and are galvanically isolated therefrom. The multiple pods may be organized into packs, with a pack including a thermal management system.

Claims

1. An energy storage system comprising:

a grid tie unit comprising at least one DC/AC converter, the grid tie unit coupling the energy storage system to an external AC system, wherein the grid tie unit includes a thermal control system;

a DC bus coupled to the grid tie unit;

a site master computer configured to control the energy storage system and a plurality of other energy storage systems communicatively coupled thereto;

a grid tie unit comprising at least one DC/AC converter;

a plurality of pods connected to the DC bus, each pod including;

plurality of battery cells; and

a power electronics unit configured to galvanically isolate the plurality of battery cells from a plurality of battery cells of at least one other pod of the plurality of pods and from the DC bus, wherein the plurality of battery cells is allowed to float relative to the grid tie unit and wherein at least some of the plurality of pods are arranged in a pack that includes a thermal control system respective to at least some of the plurality of pods.

2. The energy storage system of claim 1, further comprising at least one solar panel connected to the DC bus.

3. The energy storage system of claim 1, wherein the power electronics unit includes a DC/DC converter.

4. The energy storage system of claim 3, wherein the DC/DC converter is a main DC/DC converter, and wherein the power electronics unit further comprises an additional DC/DC converter.

9. The energy storage system of claim 1, further comprising at least one solar panel connected to the DC bus.

14. The energy storage system of claim 1, wherein the site master computer is operable to provide an enable signal to one or more pods of the plurality of pods.

5. An energy storage system comprising:

a grid tie unit comprising at least one DC/AC converter, the grid tie unit coupling the energy storage system to an external AC system, wherein the grid tie unit includes a thermal control system;

an intermediate bus coupled to the grid tie unit; and

an energy storage unit coupled to the intermediate bus and having a plurality of pods, each pod including a plurality of battery cells and a power electronics unit, wherein the power electronics unit is configured to galvanically isolate the plurality of battery cells of at least one pod of the plurality of pods from the intermediate bus and wherein at least some of the plurality of pods are arranged in a pack that includes a thermal control system respective to at least some of the plurality of pods.

6. The energy storage system of claim 5, further comprising at least one solar panel connected to the intermediate bus.

7. The energy storage system of claim 6, further comprising a DC/DC converter between the solar panel and the intermediate bus.

8. The energy storage system of claim 6, wherein the power electronics unit comprises a DC/DC converter.

10. The energy storage system of claim 5, wherein the power electronics unit includes a DC/DC converter.

11. The energy storage system of claim 10, wherein the DC/DC converter is a main DC/DC converter, and wherein the energy storage system further comprises an additional DC/DC converter.

15. The energy storage system of claim 5, further comprising a site master computer, wherein the site master computer is operable to provide an enable signal to one or more pods of the plurality of pods.

12. An energy storage system comprising:

an energy storage unit comprising a plurality of pods, each pod including a plurality of battery cells and a power electronics unit, wherein the power electronics unit is configured to cause the battery cells to float relative to the energy storage system and are galvanically isolated therefrom and wherein at least some of the plurality of pods are arranged in a pack that includes a thermal control system respective to at least some of the plurality of pods;

an AC component for connection to a grid, including an AC/DC converter that has its own thermal control system;

an intermediate bus connecting the energy storage unit to the AC component;

at least one solar panel connected to the intermediate bus; and

a DC/DC converter between the solar panel and the intermediate bus.

13. The energy storage system of claim 12, further comprising a DC/DC converter between the solar panel and the intermediate bus.