Battery module, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-2017365886-A1
Application number	US-201715692103-A
Country	US
Kind code	A1
Filing date	Aug 31, 2017
Priority date	Sep 16, 2015
Publication date	Dec 21, 2017
Grant date	—

Abstract

A battery module according to one embodiment includes a first battery unit including a first nonaqueous electrolyte battery, and a second battery unit electrically connected in series to the first battery unit and including a second nonaqueous electrolyte battery. Each of the first and second nonaqueous electrolyte batteries includes a negative electrode including a spinel-type lithium titanate. The first nonaqueous electrolyte battery includes a positive electrode including at least one olivine-type lithium phosphate. The second nonaqueous electrolyte battery includes a positive electrode including at least one lithium-containing composite oxide. The discharge capacity ratio Ca/Cb between the first battery unit and the second battery unit satisfy 1.5<Ca/Cb≦50.

First claim

What is claimed is:

1 . A battery module comprising:
a first battery unit comprising a n first nonaqueous electrolyte battery, wherein n is an integer of 1 or more, the first nonaqueous electrolyte battery comprising a negative electrode comprising a spinel-type lithium titanate, a positive electrode comprising at least one olivine-type lithium phosphate represented by a formula of LiM A PO 4 , wherein M A is at least one metal element selected from the group consisting of Mn, Fe, Co, Ni, Mg and Ti, and a first nonaqueous electrolyte; and a second battery unit comprising a m second nonaqueous electrolyte battery, wherein m is an integer of 1 or more, and electrically connected in series to the first battery unit, the second nonaqueous electrolyte battery comprising a negative electrode comprising the spinel-type lithium titanate, a positive electrode comprising at least one lithium-containing composite oxide represented by a formula of LiM B O 2 , wherein M B is at least one metal element selected from the group consisting of Mn, Co and Ni, and a second nonaqueous electrolyte, wherein: a discharge capacity Ca [Ah] of the first battery unit and a discharge capacity Cb [Ah] of the second battery unit satisfy a relational expression of 1.5<Ca/Cb≦50; the discharge capacity Ca is a capacity [Ah] obtained by subtracting a capacity Cm [Ah] of the battery module from a discharge capacity C 1 [Ah] obtained by discharging the first battery unit of the battery module in a state-of-charge of 100% to a voltage of 1.5×n V at a constant current value of 0.2 C; and the discharge capacity Cb is a capacity [Ah] obtained by subtracting the capacity Cm [Ah] of the battery module from a discharge capacity C 2 [Ah] obtained by discharging the second battery unit of the battery module in the state-of-charge of 100% to a voltage of 1.5×m V at a constant current value of 0.2 C.

2 . The battery module according to claim 1 , wherein an open circuit voltage OCV of the second battery unit is 2.5 V or less in the battery module in a state-of-charge of 100%.

3 . The battery module according to claim 1 , wherein the at least one lithium-containing composite oxide comprises a lithium-containing composite oxide represented by a formula of LiNi 1-x-y Co x Mn y O 2 (0<x, y≦0.4).

4 . The battery module according to claim 3 , wherein the at least one lithium-containing composite oxide comprises a lithium-cobalt composite oxide.

5 . The battery module according to claim 1 , wherein the negative electrode comprised in the second nonaqueous electrolyte battery further comprises at least one titanium-containing oxide excluding the spinel-type lithium titanate.

6 . The battery module according to claim 5 , wherein the titanium-containing oxide is at least one selected from the group consisting of a monoclinic p-type titanium-containing oxide, an anatase-type titanium-containing oxide, a ramsdelide-type lithium titanate, a monoclinic niobium-titanium composite oxide and an orthorhombic sodium-containing niobium-titanium composite oxide.

7 . The battery module according to claim 1 , wherein the at least one olivine-type lithium phosphate comprises an olivine-type lithium phosphate represented by a formula of LiMn 1-s-t Fe s Mg t PO 4 , wherein 0<s and t≦0.2.

8 . The battery module according to claim 7 , wherein the at least one olivine-type lithium phosphate comprises an olivine-type lithium-iron phosphate.

9 . The battery module according to claim 1 , wherein the discharge capacity Ca [Ah] of the first battery unit and the discharge capacity Cb [Ah] of the second battery unit satisfy a relational expression of 5<Ca/Cb≦30.

10 . The battery module according to claim 1 , wherein the discharge capacity Ca [Ah] of the first battery unit and the discharge capacity Cb [Ah] of the second battery unit satisfy a relational expression of 8<Ca/Cb≦20.

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

12 . The battery pack according to claim 11 , which comprises the battery modules, and the battery modules are electrically connected in series, parallel or a combination thereof.

13 . The battery pack according to claim 11 , further comprising:
an external power distribution terminal; and a protective circuit.

14 . A vehicle comprising the battery pack according to claim 11 .

Assignees

• Toshiba Kk

Inventors

• Hoshina Keigo
• Isozaki Yoshiyuki
• Takami Norio

Classifications

• H01M10/0525

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

• H01M2220/20

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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title