Battery housing

Patent metadata

Field	Value
Publication number	US-2021078413-A1
Application number	US-201716613678-A
Country	US
Kind code	A1
Filing date	May 18, 2017
Priority date	May 18, 2017
Publication date	Mar 18, 2021
Grant date	—

Abstract

The present invention relates to a battery housing for an electrically powered vehicle, in particular a motor vehicle, comprising a battery accommodation space made of a first flat steel product and a housing frame made of a second flat steel product, where the two flat steel products differ in terms of at least one of the properties yield strength (Rp0.2), tensile strength (RM) or elongation (A50).

First claim

1 . A battery housing for an electrically powered vehicle, in particular a motor vehicle, comprising:
a battery accommodation space made of a first flat steel product, and a housing frame made of a second flat steel product, where the two flat steel products differ in terms of at least one of the properties yield strength (R p0.2 ), tensile strength (R M ) or elongation (A 50 ).

2 . The battery housing as claimed in claim 1 , wherein the first flat steel product has at least one of a yield strength of at least 650 MPa, a tensile strength of at least 1250 MPa and an elongation of at least 18% and the second flat steel product has at least one of a yield strength of at least 1000 MPa, a tensile strength of at least 1400 MPa and an elongation of at least 12%.

3 . The battery housing as claimed in claim 2 , wherein both flat steel products consist of a steel containing, in addition to iron and unavoidable impurities, (in % by weight)
C: from 0.1 to 0.35,
Si: from 0.5 to 1.8,
Mn: from 1.4 to 3.2,
Al: up to 1.0,
P: up to 0.015,
S: up to 0.0025,
N: up to 0.0075,
and has a microstructure comprising (in % by area) less than 30% of ferrite, less than 10% of bainite, 5-70% of unannealed martensite, 5-30% of residual austenite and 25-80% of annealed martensite, where at least 99% of the iron carbides present in the annealed martensite have a size of less than 500 nm.

4 . The battery housing as claimed in claim 1 , wherein the battery accommodation space is configured in the form of a trough having a circumferential flange.

5 . The battery housing as claimed in claim 4 , wherein the trough is made in one piece and has at least one of a radius R u in the range 5-15 mm and a radius R o in the range 4-12 mm and a drawing angle α in the range 6-8°.

6 . The battery housing as claimed in claim 4 , wherein the trough is made up of at least four frame profiles and a bottom plate.

7 . The battery housing as claimed in claim 6 which further comprises an underride guard plate made of the first or second flat steel product.

8 . The battery housing as claimed in claim 7 , wherein the battery accommodation space has at least one of longitudinal and transverse carriers which are arranged at least one of inside and outside and are made of the second flat steel product.

9 . The battery housing as claimed in claim 8 , further comprising a lid.

10 . The battery housing as claimed in any of claims 1 to claim 9 , wherein the housing frame is made up of at least 4 profile elements.

11 . The battery housing as claimed in claim 10 , wherein the profile elements have reinforcing elements arranged inside.

12 . An electrically powered vehicle, in particular motor vehicle, comprising a battery housing as claimed in claim 1 .

13 . The battery housing as claimed in claim 1 , further comprising at least one element selected from the group consisting of “Mo, V, Ti and/or Nb, B and Cr” in the following contents:
Cr: from 0.1 to 0.5,
Mo: from 0.05 to 0.25,
V: from 0.05 to 0.15,
B: from 0.0005 to 0.005,
Ti and/or Nb: from 0.005 to 0.135.

Assignees

• Thyssenkrupp Steel Europe Ag
• Thyssenkrupp Ag

Inventors

• Kibben Martin
• Hilfrich Erik
• Schirmer Matthias

Classifications

• B60L50/60 Primary

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• H01M50/236

  Hardness · CPC title

• H01M50/224

  Metals · CPC title

• H01M50/271

  Lids or covers for the racks or secondary casings · CPC title

• H01M2220/20

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