OVERDISCHARGE PREVENTING CIRCUIT APPARATUS AND OVERDISCHARGE PREVENTING METHOD

• US 20070231680A1
• Filed: 06/12/2007
• Published: 10/04/2007
• Est. Priority Date: 08/30/2002
• Status: Active Grant

• Current Assignee: Motoya Kanda, Takashi Kishi, Yuji Satoh
• Original Assignee: Motoya Kanda, Takashi Kishi, Yuji Satoh
• Inventors: Kishi, Takashi, Satoh, Yuji, Kanda, Motoya
• Granted Patent: US 7,501,797 B2
• Time in Patent Office: Days
• US Class Current: 429/122
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An overdischarge preventing circuit apparatus according to this invention is an overdischarge preventing circuit apparatus for a nonaqueous electrolyte secondary battery, including a discharge control mechanism which controls discharge of the nonaqueous electrolyte secondary battery when a surface temperature of the nonaqueous electrolyte secondary battery exceeds a discharge control temperature T₁ (° C.) represented by
T₁=T₀+QA  (1)
where T₀ is an ambient temperature (° C.), Q is 8 (° C./C), and A is a discharge rate (C).

Claims

1. A battery pack comprising:

a nonaqueous electrolyte secondary battery; and

a discharge control mechanism which controls discharge of the nonaqueous electrolyte secondary battery when a surface temperature of the nonaqueous electrolyte secondary battery exceeds a discharge control temperature T₁ (°

C.) represented by

T₀=T₀+QA 

 

(1)

where T₀ is an ambient temperature in a range of 0 to 60°

C., Q is 8 (°

C./C), and A is a discharge rate (C) of the nonaqueous electrolyte secondary battery in a case where a current required for discharging a nominal capacity of the nonaqueous electrolyte secondary battery in one hour is 1C, and is within a range of 4C to 7C.