Lithium secondary battery pack, as well as electronic device, charging system, and charging method using said pack

Patent metadata

Field	Value
Publication number	US-RE50521-E
Application number	US-201418088334-A
Country	US
Kind code	E1
Filing date	Feb 25, 2014
Priority date	Mar 11, 2013
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cm 2 or less, and a relational expression (1) and a relational expression (2) below are established where A (mΩ) is an impedance of the lithium secondary battery and B (mΩ) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (mΩ) of the lithium secondary battery:

A≤50 mΩ  (1)

B/A≤1  (2).

First claim

The invention claimed is:

1. A lithium secondary battery pack comprising:
a lithium secondary battery comprising an electrode body formed of a positive electrode and a negative electrodefacing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element;; and a protection circuitcomprising a field effect transistor,,
wherein the negative electrode comprises a negative electrode material mixture layer that contains an Si-containing material as a negative electrode active material,
the lithium secondary battery has an energy density per volume of 450 Wh/L or more,
the lithium secondary battery has a current density of 3.0 mA/cm 2 or less, and
a relational expression (1) and a relational expression (2) below are established where A (mΩ) is an impedance of the lithium secondary battery, B (mΩ) is an impedance of an entire circuit unit of the lithium secondary battery pack excepting the impedance A (mΩ) of the lithium secondary battery, and the impedance B (mΩ) is determined by subtracting the impedance A (mΩ) from the impedance of the entire circuit unit of the lithium secondary battery pack:
A≤50 mΩ  (1)

B/A≤1  (2).

2. The lithium secondary battery pack according to claim 1 , wherein the Si-containing material is a material containing Si and O as constituent elements.

3. The lithium secondary battery pack according to claim 1 , wherein the Si-containing material is a composite comprising a material containing Si and O as constituent elements serving as a core material and a carbon coating layer formed on a surface of the core material.

4. The lithium secondary battery pack according to claim 3 , wherein the material containing Si and O as constituent elements is a material represented by a general compositional formula SiO x , where x is 0.5≤x≤1.5.

5. The lithium secondary battery pack according to claim 2 , wherein the material containing Si and O as constituent elements is a material represented by a general compositional formula SiO x , where x is 0.5≤x≤1.5.

6. The lithium secondary battery pack according to claim 1 , wherein the positive electrode comprises a positive electrode material mixture layer containing contains a Ni-containing material as a positive electrode active material.

7. An electronic device comprising the lithium secondary battery pack according to claim 6 .

8. A charging system comprising the lithium secondary battery pack according to claim 5 .

9. A charging method comprising the lithium secondary battery pack according to claim 6 .

10. An electronic device comprising the lithium secondary battery pack according to claim 1 .

11. A charging system comprising the lithium secondary battery pack according to claim 1 .

12. A charging method comprising the lithium secondary battery pack according to claim 1 .

13. A lithium secondary battery pack comprising:
a lithium secondary battery comprising an electrode body formed of a positive electrode and a negative electrodefacing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element;; and a protection circuitcomprising a field effect transistor,,
wherein the positive electrode comprises a positive electrode material mixture layer that contains a Ni-containing material as a positive electrode active material,
the lithium secondary battery has an energy density per volume of 450 Wh/L or more,
the lithium secondary battery has a current density of 3.0 mA/cm 2 or less, and
a relational expression (1) and a relational expression (2) below are established where A (mΩ) is an impedance of the lithium secondary battery, B (mΩ) is an impedance of an entire circuit unit of the lithium secondary battery pack excepting the impedance A (mΩ) of the lithium secondary battery, and the impedance B (mΩ) is determined by subtracting the impedance A (mΩ) from the impedance of the entire circuit unit of the lithium secondary battery pack:
A≤50 mΩ  (1)

B/A≤1  (2).

14. An electronic device comprising the lithium secondary battery pack according to claim 13 .

15. A charging system comprising the lithium secondary battery pack according to claim 13 .

16. A charging method comprising the lithium secondary battery pack according to claim 13 .

17. The lithium secondary battery pack of claim 1 , wherein the impedance index B/A of relational expression (2) is established as:
0.71≤B/A≤0.86 (2).

18. The lithium secondary battery pack of claim 1 , wherein the protection circuit comprises a field effect transistor.

19. The lithium secondary battery pack of claim 13 , wherein the impedance index B/A of relational expression (2) is established as:
0.71≤B/A≤0.86 (2).

20. The lithium secondary battery pack of claim 13 wherein the protection circuit comprises a field effect transistor.

Assignees

• Maxell Ltd

Inventors

• Kamizori Haruki
• Yamada Masayuki
• Kita Fusaji

Classifications

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M10/46

  Accumulators structurally combined with charging apparatus (circuits for charging H02J7/00) · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title