Battery pack and liquid leakage detection method thereof

Patent metadata

Field	Value
Publication number	US-9306248-B2
Application number	US-201313742372-A
Country	US
Kind code	B2
Filing date	Jan 16, 2013
Priority date	Jan 16, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A battery pack and a liquid leakage detection method thereof are provided. The battery pack comprises a plurality of battery cells, a isolated liquid and a battery box containing the isolated liquid. The battery cells are soaked in the isolated liquid. The battery box comprising a box body and a cover plate. The isolated liquid is a fire-retardant and insulating liquid that has a specific gravity smaller than an electrolyte and is insoluble in the electrolyte. A collection portion is disposed at the bottom of the battery box, and a detection component is disposed in the collection portion. The present disclosure encloses the leaked electrolyte in the fire-retardant isolated liquid and uses the detection component to detect a resistance value of the isolated liquid so as to improve the safety of the box body.

First claim

What we claimed are:

1. A battery pack, comprising a plurality of battery cells, an isolated liquid and a battery box containing the isolated liquid, the battery cells being soaked in the isolated liquid, the battery box comprising a box body and a cover plate, and electrical connection components being disposed in the battery pack, wherein the isolated liquid is a fire-retardant and insulating liquid that has a specific gravity smaller than an electrolyte and is insoluble in the electrolyte, the electrical connection components are soaked in the isolated liquid, the battery cells are placed upside down, a support frame and a collection portion are disposed at the bottom of the battery box, the support frame supports the battery cells overhead, a detection component is disposed in the collection portion, and the detection component is one or more of a conductivity sensor, a PH value sensor, a fluorion selective electrode and a liquid-level refraction sensor.

2. The battery pack of claim 1 , wherein the isolated liquid is one or both of silicone oil and transformer oil.

3. The battery pack of claim 1 , wherein the collection portion is V-shaped or U-shaped, and a recess is formed at a V-shaped or U-shaped bottom of the collection portion.

4. A battery pack, comprising a plurality of battery cells, an isolated liquid and a battery box containing the isolated liquid, the battery cells being soaked in the isolated liquid, the battery box comprising a box body and a cover plate, and electrical connection components being disposed in the battery pack, wherein the isolated liquid is a fire-retardant and insulating liquid that has a specific gravity smaller than an electrolyte and is insoluble in the electrolyte, a collection portion is disposed at the bottom of the battery box, and a detection component is disposed in the collection portion.

5. The battery pack of claim 4 , wherein the electrical connection components are soaked in the isolated liquid.

6. The battery pack of claim 4 , wherein the isolated liquid is one or both of silicone oil and transformer oil.

7. The battery pack of claim 4 , wherein the battery cells are placed upside down, and a support frame is disposed at the bottom of the battery box to support the battery cells overhead.

8. The battery pack of claim 4 , wherein a bottom surface of each of the battery cells is fixed to the cover plate.

9. The battery pack of claim 4 , wherein the detection component is one or more of a conductivity sensor, a PH value sensor, a fluorion selective electrode and a liquid-level refraction sensor.

10. The battery pack of claim 4 , wherein the collection portion is V-shaped or U-shaped.

11. The battery pack of claim 10 , wherein a recess is formed at a V-shaped or U-shaped bottom of the collection portion.

Assignees

• Microvast Power Systems Co Ltd

Inventors

• Yang Congming
• Tong Zhiming
• Li Xiang
• Li Hui

Classifications

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/488

  Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density · CPC title

• H01M10/484 Primary

  for measuring electrolyte level, electrolyte density or electrolyte conductivity · CPC title

• H01M50/24

  adapted for protecting batteries from their environment, e.g. from corrosion (thermal insulation H01M10/658) · CPC title

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title