Battery module, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-10673103-B2
Application number	US-201715692103-A
Country	US
Kind code	B2
Filing date	Aug 31, 2017
Priority date	Sep 16, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

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 2 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 in 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 C1 [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 C2 [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≤0.4; 0<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 3-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≤0.2 and 0<t≤0.2.

8. The battery module according to claim 1 , 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 a plurality of 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 .

15. The battery module according to claim 1 , wherein m is an integer of 2 or more.

16. The battery module according to claim 1 , wherein the first battery unit comprises two or more first nonaqueous electrolyte batteries, and the two or more first nonaqueous electrolyte batteries are electrically connected in series.

Assignees

• Toshiba Kk

Inventors

• Hoshina Keigo
• Isozaki Yoshiyuki
• Takami Norio

Classifications

• H01M4/133

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

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M2220/20

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

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H02J7/0021

  Electricity · mapped topic