Liquid-cooled battery pack system

• US 20170162923A1
• Filed: 01/20/2015
• Published: 06/08/2017
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Microvast, Inc. (Microvast Holdings, Inc.)
• Original Assignee: Microvast Power Systems Co. Ltd (Microvast Holdings, Inc.)
• Inventors: DENG, GUOYOU, WU, YANG, GUO, FENG
• Granted Patent: US 9,774,065 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/054 Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/6557 arranged between the cells
• CPC Class Codes: H01M 10/6568 characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present invention provides a battery module and a liquid-cooled battery system that uses it, a battery cell and a current collector sheet, on the premise that the materials like the electrode and separator and so on are completely the same, energy density of the battery pack is greatly increased; the cell and the current collector sheet are fully welded connections, the joints are fewer and it is not prone to produce desoldering, also ensuring the stability of the of the cell tab and high current carrying capacity, and when putting the parallel battery module in series, the use of wires are avoided, thus reduces the volume of the battery pack; the innovative design for the liquid-cooled battery pack system, improves the thermal balance between the cells, and the heat-dissipation in battery pack distributes more evenly, the insulation property of the battery package is highly improved, controlling the heat-dissipation capacity of the system by adjusting the flow rate of the circulating pump, not only the unnecessary energy consumption can be avoided, but also have a better impact resistance.

Claims

1. A liquid-cooled battery pack system, comprising:

a battery module;

a battery case;

a cooling insulating liquid;

a circulating pump, a radiator; and

a liquid reservoir tank;

the battery module having a plurality of battery cells, the battery module and the cooling insulating liquid being disposed in the battery case, the battery module being immersed in the cooling insulating liquid, a first end of the battery pack being provided with an outlet of the cooling insulation liquid, a second end being provided with an inlet of the cooling insulating liquid; and

the inlet of the cooling insulating liquid, the reservoir tank, the radiator, the circulating pump and the outlet of the cooling insulating liquid being closed connection through pipelines, each ends of the battery module being provided with a fixed frame, the fixed frame being provided with a blocking portion holding the cell tab, both ends of the fixed frame being provided with flow parts, the flow parts being provided with circulation passages and harness channels.

2. The liquid-cooled battery pack system of claim 1, wherein the battery case is sealed by the components of a case with both ends open and a cover.

3. The liquid-cooled battery pack system of claim 2, wherein the battery case can be made of stainless steel or aluminum alloy.

4. The liquid-cooled battery pack system of claim 1, wherein the cooling insulating liquid is selected from one or both of the silicone oil, the transformer oil, and the fluorinated hydrocarbons.

5. The liquid-cooled battery pack system of claim 1, wherein a separator is provided between the adjacent battery cells, the surface area of the separator is larger than the surface area of the battery cell.

6. The liquid-cooled battery pack system of claim 5, wherein the separator is provided with concave and convex patterns, the concave and convex patterns distribute over the entire separator.

7. The liquid-cooled battery pack system of claim 6, wherein the concave and convex patterns are selected from at least one of the diamond-shaped concave and convex patterns, square-shaped concave and convex patterns, triangle-shaped concave and convex patterns, strip-shaped concave and convex patterns, or orange peel-shaped concave and convex patterns.

8. The liquid-cooled battery pack system of claim 1, wherein:

the extending direction of the circulation passage is parallel to the longitudinal direction of the battery pack,

the depth of the circulation passage is equal to the thickness of the battery module, and the opening corresponding to the outlet of the cooling insulating liquid is closed.

9. The liquid-cooled battery pack system of claim 8, wherein the circulation passage'"'"'s inner wall closed to the battery cell is provided with a plurality of circulation holes.

10. The liquid-cooled battery pack system of claim 1, wherein the fixed frames are provided with buffer rings between them, the buffer rings are sheathed on the battery cell.

11. The liquid-cooled battery pack system of claim 10, wherein both end surfaces of the battery module are provided with cushion separately.

12. The liquid-cooled battery pack system of claim 1, wherein the bottom of the fixed frame is provided with shunt grooves, the extending direction of the shunt grooves are in the same direction with the extending direction of the circulation passage.

13. The liquid-cooled battery pack system of claim 1, wherein the outer wall of the case is provided with a plurality of longitudinal reinforcing ribs.

14. The liquid-cooled battery pack system of claim 1, wherein the outer surface of the case is provided with explosion-proof grooves, the notch depth of the explosion-proof grooves in about 20%-50% of the wall thickness of the case.

15. The liquid-cooled battery pack system of claim 14, wherein the explosion-proof grooves include a U-type groove.

16. The liquid-cooled battery pack system of claim 15, wherein the battery pack is provided with a temperature sensor.

17. The liquid-cooled battery pack system of claim 16, wherein the temperature sensor is provided at the tabs of the battery module.

18. The liquid-cooled battery pack system of claim 16, wherein the liquid reservoir tank is provided with a liquid level sensor.

19. The liquid-cooled battery pack system of claim 18, wherein the liquid reservoir tank is provided with a one-way oil-gas separation exhaust valve.

20. The liquid-cooled battery pack system of claim 18, wherein the one-way oil-gas separation exhaust valve is sheathed with an airway.

21. The liquid-cooled battery pack system of claim 20, wherein the liquid reservoir tank is provided with an electrolyte detector.

22. The liquid-cooled battery pack system of claim 21, wherein the electrolyte detector includes a hydrofluoric acid detector.

23. The liquid-cooled battery pack system of claim 22, wherein the case is provided with flexible connecting bars connected to the two covers.

24. The liquid-cooled battery pack system of claim 11, wherein the outer wall of the case is provided with a plurality of longitudinal reinforcing ribs.