Battery with a fire protection device and motor vehicle

Patent metadata

Field	Value
Publication number	US-2021143383-A1
Application number	US-202017083777-A
Country	US
Kind code	A1
Filing date	Oct 29, 2020
Priority date	Nov 7, 2019
Publication date	May 13, 2021
Grant date	—

Abstract

A battery with a fire protection device, wherein the battery includes a plurality of battery cells and a battery housing, wherein a respective battery cell is arranged in an interior space of the battery housing. The fire protection device includes a composite layer with a thermal insulation layer and with a protective layer arranged on the insulation layer, wherein the composite layer is arranged on a battery housing interior side facing the interior space of the battery housing, and the insulation layer is arranged as an intermediate layer between a surface of the battery housing interior side and the protective layer and is protected by the protective layer against a gas and/or flame stream exiting the respective battery cell in the event of damage, whereby its thermally insulating properties are maintained.

First claim

1 . A battery with a fire protection device, wherein the battery comprises:
a plurality of battery cells and a battery housing, wherein a respective battery cell is arranged in an interior space of the battery housing, wherein the fire protection device further comprises a composite layer with a thermal insulation layer and with a protective layer arranged on the insulation layer, wherein the composite layer is arranged on a battery housing interior side facing the interior space of the battery housing, and the insulation layer is arranged as an intermediate layer between a surface of the battery housing interior side and the protective layer and is protected by the protective layer against a gas and/or flame stream exiting the respective battery cell in the event of damage, whereby its thermally insulating properties are maintained.

2 . The battery according to claim 1 , wherein the respective battery cell comprises a predetermined breakthrough site which is arranged on a side of the battery cell arranged facing the composite layer, and wherein, in the event of damage, the gas and/or flame stream first exits from the at least one predetermined breakthrough site and hits the composite layer.

3 . The battery according claim 1 , wherein a form and/or orientation of the surface and/or a pressure gradient in the interior space is/are designed to guide the gas and/or flame stream along a predetermined path, wherein the fire protection device comprises a catch container for catching the gas and/or flame stream guided toward the catch container and/or particles transported in the gas and/or flame stream, and the composite layer is arranged along the path.

4 . The battery according to claim 1 , wherein the insulation layer is made of an intumescent material, wherein a temperature occurring in the event of damage triggers an intumescence-induced volume increase of the insulation layer.

5 . The battery according to claim 1 , wherein the protective layer is made of a glass fiber fabric and/or a metallic scrim or knitted fabric and/or of a metallic film.

6 . The battery according to claim 1 , wherein the protective layer is integrated in a material of the insulation layer.

7 . The battery according to claim 1 , wherein the insulation layer has a thickness of 0.5 to 1 millimeter, in particular 0.6 millimeters.

8 . The battery according to claim 1 , wherein the gas and/or flame stream has a temperature of 600 to 1100 degrees Celsius, in particular 840 degrees Celsius, which is dependent on the chemistry of the cell.

9 . The battery according to claim 1 , wherein, in the event of damage, a battery cell interior pressure has a value of five to ten bars, in particular eight bars, wherein, upon reaching the damage-induced battery cell interior pressure, the predetermined breakthrough site bursts.

10 . The battery according claim 2 , wherein a form and/or orientation of the surface and/or a pressure gradient in the interior space is/are designed to guide the gas and/or flame stream along a predetermined path, wherein the fire protection device comprises a catch container for catching the gas and/or flame stream guided toward the catch container and/or particles transported in the gas and/or flame stream, and the composite layer is arranged along the path.

11 . The battery according to claim 2 , wherein the insulation layer is made of an intumescent material, wherein a temperature occurring in the event of damage triggers an intumescence-induced volume increase of the insulation layer.

12 . The battery according to claim 3 , wherein the insulation layer is made of an intumescent material, wherein a temperature occurring in the event of damage triggers an intumescence-induced volume increase of the insulation layer.

13 . The battery according to claim 2 , wherein the protective layer is made of a glass fiber fabric and/or a metallic scrim or knitted fabric and/or of a metallic film.

14 . The battery according to claim 3 , wherein the protective layer is made of a glass fiber fabric and/or a metallic scrim or knitted fabric and/or of a metallic film.

15 . The battery according to claim 4 , wherein the protective layer is made of a glass fiber fabric and/or a metallic scrim or knitted fabric and/or of a metallic film.

16 . The battery according to claim 2 , wherein the protective layer is integrated in a material of the insulation layer.

17 . The battery according to claim 3 , wherein the protective layer is integrated in a material of the insulation layer.

18 . The battery according to claim 4 , wherein the protective layer is integrated in a material of the insulation layer.

19 . The battery according to claim 5 , wherein the protective layer is integrated in a material of the insulation layer.

20 . The battery according to claim 2 , wherein the insulation layer has a thickness of 0.5 to 1 millimeter, in particular 0.6 millimeters.

Assignees

• Audi Ag

Inventors

• Czech Marvin
• Yuan Yixin

Classifications

• H01M50/392

  with means for neutralising or absorbing electrolyte; with means for preventing leakage of electrolyte through vent holes · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/383

  Flame arresting or ignition-preventing means · CPC title

• H01M50/358

  External gas exhaust passages located on the battery cover or case · CPC title

• H01M10/625 Primary

  Vehicles · CPC title