Battery module and battery pack

Patent metadata

Field	Value
Publication number	US-2017005322-A1
Application number	US-201615265222-A
Country	US
Kind code	A1
Filing date	Sep 14, 2016
Priority date	Jan 30, 2015
Publication date	Jan 5, 2017
Grant date	—

Abstract

According to one embodiment, there is provided a battery module. The battery module includes five nonaqueous electrolyte batteries electrically connected in series. The five nonaqueous electrolyte batteries each include a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode includes an active material including a titanium-including composite oxide. The titanium-including composite oxide includes Na and a metal element M within a crystal structure. The metal element M is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al.

First claim

1 . A battery module comprising five nonaqueous electrolyte batteries electrically connected in series, each of the five nonaqueous electrolyte batteries comprising:
a positive electrode; a negative electrode; and a nonaqueous electrolyte, wherein the negative electrode comprises an active material comprising a titanium composite oxide comprising Na and a metal element M in its crystal structure, the metal element M being at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al, and the crystal structure of the titanium composite oxide has symmetry belonging to a space group Cmca or Fmmm.

2 . The battery module according to claim 1 , wherein the metal element M comprises Nb.

3 . The battery module according to claim 1 , wherein the titanium composite oxide is a composite oxide represented by a formula Li 2+a M(I) 2−b Ti 6−c M(II) d O 14+σ :
wherein: M(I) is Na, or comprises Na and at least one element selected from the group consisting of Sr, Ba, Ca, Mg, Cs, and K; M(II) is at least one element selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al, a is within a range of 0≦a≦6; b is within a range of 0≦b<2; c is within a range of 0<c<6; d is within a range of 0<d≦6; and σ is within a range of −0.5≦σ≦0.5.

4 . The battery module according to claim 1 , wherein the titanium composite oxide has an orthorhombic crystal structure, and is a composite oxide represented by A formula Li x M1 1−y M2 y Ti 6−z M3 z O 14+δ :
wherein: M1 is at least one element selected from the group consisting of Sr, Ba, Ca, and Mg; M2 is Na, or comprises Na and at least one element selected from the group consisting of Cs and K; M3 is at least one element selected from the group consisting of Al, Fe, Zr, Sn, V, Nb, Ta, and Mo; x is within a range of 2≦x≦6; y is within a range of 0<y<1; z is within a range of 0<z<6; and δ is within a range of −0.5≦δ≦0.5.

5 . The battery module according to claim 4 , wherein M3 is at least one element selected from the group consisting of trivalent Al and Fe, tetravalent Zr and Sn, pentavalent V, Nb and Ta, and hexavalent Mo.

6 . The battery module according to claim 4 , wherein, in an X-ray diffraction diagram for the composite oxide obtained by a powder X-ray diffraction method using Cu—Kα rays, an intensity ratio I L /I H is within a range of 0.6≦I L /I H ≦3, wherein the intensity I L is an intensity of a strongest diffraction peak appearing within a range of 17°≦2θ≦18.5°, and the intensity I H is an intensity of a strongest diffraction peak appearing within a range of 18.5°<2θ≦19.5°.

7 . The battery module according to claim 1 , wherein the titanium composite oxide has an orthorhombic crystal structure, and is a composite oxide represented by a formula Li 2+w Na 2−x2 Mα y2 Ti 6−z2 Mβ z2 O 14+δ2 :
wherein:
Mα is at least one element selected from the group consisting of Cs and K;
Mβ is at least one element selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al;
w is within a range of 0≦w≦4;
x2 is within a range of 0<x2<2;
y2 is within a range of 0≦y2<2;
z2 is within a range of 0<z2<6; and
δ2 is within a range of −0.5≦δ2≦0.5.

8 . The battery module according to claim 7 , wherein Mβ is at least one element selected from the group consisting of trivalent Fe, Co, Mn and Al, tetravalent Zr and Sn, pentavalent V, Nb and Ta, and hexavalent Mo and W.

9 . The battery module according to claim 7 , wherein, in an X-ray diffraction diagram for the composite oxide obtained by a powder X-ray diffraction method using Cu—Kα rays, an intensity ratio I L20 /I H20 is within a range of 2.25≦I L20 /I H20 ≦3.5, wherein the intensity I L20 is an intensity of a strongest diffraction peak appearing in a range of 17°≦2θ≦18.5°, and the intensity I H20 is an intensity of a strongest diffraction peak appearing in a range of 18.5°≦2θ≦19.5°.

10 . A battery pack comprising the battery module according to claim 1 .

11 . The battery pack according to claim 10 , which further comprises a protective circuit and an energizing terminal.

12 . The battery pack according to claim 10 , wherein the battery pack comprises a plurality of the battery modules, wherein the plural battery modules are electrically connected in series, in parallel, or in a combination of in series and in parallel.

13 . A vehicle onto which is mounted the battery pack according to claim 10 .

14 . The vehicle according to claim 13 , wherein the battery pack is configured to recover a regenerative energy from motivity of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Takami Norio
• Yoshida Yorikazu
• Ise Kazuki

Classifications

• H01M10/0481

  Compression means other than compression means for stacks of electrodes and separators · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title